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Journal articles on the topic '2-a]pyrimidine-2-one acetic acids'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Sharulatha, Venugopal, Anbazhagan Abinaya, Rajeswari M., and Sundaram Sivakamasundari. "Synthesis, characterization and molecular docking of N-aryl amides of pyrido[1,2-a]pyrimidin2-ones as potential antibacterial agents." Journal of Indian Chemical Society Vol. 97, No. 9b, Sept 2020 (2020): 1584–89. https://doi.org/10.5281/zenodo.5665014.

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Department of Chemistry, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore-641 043, Tamil Nadu, India <em>E-mail:</em> abinayachemist@gmail.com <em>Manuscript received online 26 July 2020, accepted 30 August 2020</em> Nitrogen-containing heterocyclic compounds play the most key role in the discovery of new drugs. Among all, pyrimidine possesses a wide spectrum because of its positive pharmacological and biological properties. Some novel amides of pyrido[1,2- <em>a</em>]pyrimidine-2-one acetic acids were synthesized, and the structure of the products was

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2

Byers, Jeffrey H., Michael P. Duff, and Gregory W. Woo. "A one-step radical synthesis of pyrrol-2-acetic acids." Tetrahedron Letters 44, no. 36 (2003): 6853–55. http://dx.doi.org/10.1016/s0040-4039(03)01714-3.

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3

Zarei, Maaroof. "One-step Synthesis of β-lactams Using Cyanuric Fluoride". Journal of Chemical Research 37, № 1 (2013): 25–27. http://dx.doi.org/10.3184/174751912x13545429290478.

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Cyanuric fluoride works as an efficient acid activator reagent for the direct [2+2] ketene–imine cycloaddition of substituted acetic acids and imines in a one-pot synthesis under mild conditions. The yields are good to excellent and the reaction conditions are mild, simple and efficient.

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4

Hussein, Waleed M., and Ross P. McGeary. "Use of Ethyl (Benzothiazol-2-ylsulfonyl)acetate for Malonic Ester-type Syntheses of Carboxylic Acids and Esters." Australian Journal of Chemistry 67, no. 9 (2014): 1222. http://dx.doi.org/10.1071/ch14085.

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A new methodology for the synthesis of substituted carboxylic acids is described. Alkylation of either ethyl (benzothiazol-2-ylsulfonyl)acetate or ethyl 2-(benzothiazol-2-ylsulfonyl)propionate was achieved with alkyl halides and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in dichloromethane solution. These products were then desulfinated and hydrolysed in one-pot under mild conditions to give substituted acetic acids in good-to-excellent yields.

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5

Lynch, DE, G. Smith, KA Byriel, and CHL Kennard. "Molecular Cocrystals of Carboxylic Acids. I. The Crystal Structures of the Adducts of Indole-3-acetic-Acid With Pyridin-2(1H)-one, 3,5-Dinitrobenzoic Acid and 1,3,5-Trinitrobenzene." Australian Journal of Chemistry 44, no. 6 (1991): 809. http://dx.doi.org/10.1071/ch9910809.

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Three molecular cocrystal adducts of the plant hormone indole-3-acetic acid ( iaa ) have been prepared and their structures determined by X-ray diffraction. They are indole-3-acetic acid-bis [pyridin-2(1H)-one] (1), indole-3-acetic acid-3,5-dinitrobenzoic acid (2) and indole-3-acetic acid-1,3,5-trinitrobenzene (3). Complexes (2) and (3), which may be prepared in a solid-state reaction, are orange and are structurally similar, having significant π-π indole -benzene ring interactions. However, the colourless complex (1) shows no π-π ring interactions. In complex (2), the 3,5-dinitrobenzoic acid

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6

Zhang, Jun-Wei, Jin-Hui Xue, Hua-He Zhang, Fan Xu, Qing-Guang Chen, and Jing-Hua Li. "Reaction of Meldrum's Acid with an Aminomethylating Agent and Nitroalkanes." Journal of Chemical Research 41, no. 2 (2017): 72–74. http://dx.doi.org/10.3184/174751917x14839766277251.

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5-(2-Nitroalkyl)isopropylidene malonate and 5,5&prime;-(2-nitro-1,3-propylidene)bis(isopropylidene malonate) were easily synthesised by one-pot tandem reaction of substituted Meldrum's acids with the aminomethylating agent (Me2NCH2OAc) and nitroalkanes in the presence of a weak acid, such as acetic acid.

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7

Nováková, Zdena, Jana Tomanová, Lucie Štěrbová, and Pavel Drašar. "Steroid and bile acids amide conjugates with D-glucosamine." Collection of Czechoslovak Chemical Communications 76, no. 1 (2011): 65–74. http://dx.doi.org/10.1135/cccc2010105.

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New type of amide conjugates of steroid and bile acids with D-glucosamine 1 and 2 were prepared. Title compounds are prepared via acid chloride or using N-[({[(1E)-1-cyano-2-ethoxy-2-oxoethylidene]amino}oxy)(dimethylamino)methylidene]-N-methylmethanaminium tetrafluoroborate as condensation agent. They were examined for gelation properties with negative results. Per-O-acetylated D-glucosamine hydrochloride was prepared in one step procedure from D-glucosamine hydrochloride by acetylation in a mixture of acetyl chloride and acetic acid.

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8

Haase, R., and R. Lorenz. "Enthalpies of Mixing for Binary Liquid Mixtures of Monocarbonic Acids and Alcohols." Zeitschrift für Naturforschung A 40, no. 9 (1985): 947–51. http://dx.doi.org/10.1515/zna-1985-0915.

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We present the results of calorimetric measurements of the molar enthalpy of mixing (molar excess enthalpy) H̄E as a function of temperature and composition (described by the mole fraction x of the alcohol) for 18 binary liquid systems consisting of an aliphatic monocarbonic acid (formic, acetic, propionic, butyric, valeric acids) and an aliphatic alcohol (methanol, ethanol, 1-propanol. 2-propanol, 1-butanol, 2-methyl-2-propanol). The experiments cover temperatures between 298.15 K and 318.15 K and the whole range of compositions (usually nearly 40 compositions at each temperature). There is a

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9

Shilin, Serhiy, Olga Shablykina, Igor Levkov, Oleksandra Bugera, and Zoia Voitenko. "6-Oxyindan-1-ones with dipeptide chains." French-Ukrainian Journal of Chemistry 7, no. 2 (2019): 111–19. http://dx.doi.org/10.17721/fujcv7i2p111-119.

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Through N-acylation of a- or b-amino acid units by 2-(3-oxo-2,3-dihydro-1H-inden-5-yloxy)acetic acid using the method of N-hydroxysuccinimide esters new dipeptide indan-1-one derivatives were obtained. In general, the direct interaction of the acetic carboxyl group of the substrate with the amino group of the a- or b-dipeptide is a more productive strategy than the sequential peptidic condensation of the two amino acids.

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10

Midtvedt, Ann‐Christine, and Tore Midtvedt. "Production of Short Chain Fatty Acids by the Intestinal Microflora During the First 2 Years of Human Life." Journal of Pediatric Gastroenterology and Nutrition 15, no. 4 (1992): 395–403. http://dx.doi.org/10.1002/j.1536-4801.1992.tb10770.x.

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SummaryWe have followed the establishment of one group of intestinal microflora‐associated characteristics, namely, the production of short chain fatty acids (SCFAs), in 30 healthy children, by gas chromatography analysis of fecal samples taken at 0, 1, 3, 6, 9, 12, 15, 18, 21, and 24 months of age. Acetic and propionic acids were the principal SCFAs at 1 and 3 months. Successively, the production of iso‐ and n‐butyric, valeric, and caproic acids was established. At 2 years, the absolute amounts of all SCFAs with the exception of n‐valeric acid had reached adult values. However, not all childr

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11

Smith, Graham, and Daniel E. Lynch. "Two-dimensional coordination polymeric structures in caesium complexes with ring-substituted phenoxyacetic acids." Acta Crystallographica Section C Structural Chemistry 70, no. 6 (2014): 606–12. http://dx.doi.org/10.1107/s2053229614010596.

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The two-dimensional polymeric structures of the caesium complexes with the phenoxyacetic acid analogues (4-fluorophenoxy)acetic acid, (3-chloro-2-methylphenoxy)acetic acid and the herbicidally active (2,4-dichlorophenoxy)acetic acid (2,4-D), namely poly[[μ5-(4-fluorophenoxy)acetato][μ4-(4-fluorophenoxy)acetato]dicaesium], [Cs2(C8H6FO3)2]n, (I), poly[aqua[μ5-(3-chloro-2-methylphenoxy)acetato]caesium], [Cs(C9H8ClO3)(H2O)]n, (II), and poly[[μ7-(2,4-dichlorophenoxy)acetato][(2,4-dichlorphenoxy)acetic acid]caesium], [Cs(C8H5Cl2O3)(C8H6Cl2O3)]n, (III), are described. In (I), the Cs+cations of the tw

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12

Mansoorian, Bahareh, Emilie Combet, Areej Alkhaldy, Ada L. Garcia, and Christine Ann Edwards. "Impact of Fermentable Fibres on the Colonic Microbiota Metabolism of Dietary Polyphenols Rutin and Quercetin." International Journal of Environmental Research and Public Health 16, no. 2 (2019): 292. http://dx.doi.org/10.3390/ijerph16020292.

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Dietary fibre and polyphenols are both metabolised to short-chain fatty acids (SCFAs) and phenolic acids (PA) by the colonic microbiota. These may alter microbiota growth/diversity, but their interaction is not understood. Interactions between rutin and raftiline, ispaghula or pectin were investigated in human faecal batch cultures (healthy participants; 19–33 years, 4 males, 6 females, BMI 18.4–27.4) after a low (poly)phenol diet three days prior to study. Phenolic acids were measured by gas chromatography-mass spectrometry and SCFAs by gas chromatography-flame ionisation after 2, 4, 6, and 2

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13

Yates, Peter, and Magdy Kaldas. "The synthesis of norbornanes with functionalized carbon substituents at a bridgehead. 1-(3-Oxonorborn-1-yl)ethanone and 1-(3-oxonorborn-1-yl)-2-propanone." Canadian Journal of Chemistry 70, no. 5 (1992): 1492–505. http://dx.doi.org/10.1139/v92-185.

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Treatment of 2-norobornene-1-carboxylic acid (7) with one equivalent of methyllithium in ether followed by a second molar equivalent after dilution with tetrahydrofuran gave 1-(norborn-2-en-lyl)ethanone (10) and only a trace of the tertiary alcohol 11. Reaction of 7 with formic acid followed by hydrolysis gave a 4:3 mixture of exo-3- and exo-2-hydroxynorbornane-1-carboxylic acid (16 and 17), whereas oxymercuration–demercuration gave only the exo-3-hydroxy isomer 16. Oxidation of 16 and 17 gave 3- and 2-oxonorbornane-1-carboxylic acid (27 and 29), respectively. Oxymercuration–demercuration of 1

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14

Al-Kuhla, A. A. M. "The Effect of Malic and Acetic Acid Added to Drinking Water on Some Biochemical Blood Measurements in Quail." IOP Conference Series: Earth and Environmental Science 1449, no. 1 (2025): 012032. https://doi.org/10.1088/1755-1315/1449/1/012032.

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Abstract In the current research, 120 local male quails were used to study the effects of adding malic and acetic acids individually and as a combination to drinking water on quail production performance and intestinal histomorphometry. Quails were divided into 4 groups, with 3 replicates for each group and each replicate included 10 birds. group one stood for the control group, which was free of any additives. malic and acetic acid respectively were added to drinking water of the second and the third groups with a percentage of 0.025%. from the other hand, group four had drinking water to whi

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15

Cuffia, Facundo, Carina Viviana Bergamini, Irma Verónica Wolf, Erica Ruth Hynes, and María Cristina Perotti. "Influence of the culture preparation and the addition of an adjunct culture on the ripening profiles of hard cheese." Journal of Dairy Research 86, no. 1 (2019): 120–28. http://dx.doi.org/10.1017/s0022029918000870.

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AbstractThe aim of this work was to evaluate the impact of two factors on the ripening profiles of hard cooked cheeses: (F1) the growth medium for the primary and adjunct cultures, constituted by autochthonous strains: Lactobacillus helveticus 209 (Lh209) and Lactobacillus paracasei 90 (Lp90), respectively, and (F2) the addition of L. paracasei Lp90 as adjunct culture. Four types of cheeses were made: W and M cheeses in which only Lh209 was added after its growth in whey and MRS, respectively; Wa and Ma cheeses in which both strains (Lh209 and Lp90) were added after their growth in whey and MR

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16

Didyk, O. K. "Assessment of the functional state of gut microbiota in patients with metabolic-associated fatty liver disease in combination with type 2 diabetes mellitus." GASTROENTEROLOGY 58, no. 1 (2024): 44–49. http://dx.doi.org/10.22141/2308-2097.58.1.2024.586.

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Background. The purpose of the study was to assess the functional state of gut microbiota in patients with metabolic-associated fatty liver disease (MAFLD) combined with type 2 diabetes mellitus (T2DM). Materials and methods. The prospective interventional randomized study included 71 patients with MAFLD in combination with T2DM, who were examined and divided into the 2 groups. The first group included 39 people with MAFLD and T2DM without small intestinal bacterial overgrowth (SIBO). The second group consisted of 32 patients with MAFLD in combination with T2DM and SIBO. The control group incl

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17

Azev, V. N., A. N. Chulin, M. V. Molchanov та A. I. Miroshnikov. "Derivatives of (5-Oxooxazolidin-4-yl)acetic acids in aspartic acid α-carboxyl protection: a word of caution". Биоорганическая химия 50, № 3 (2024): 295–300. http://dx.doi.org/10.31857/s0132342324030084.

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Isomeric products could be isolated in a reaction of pentafluorophenyl ester of (S)-2-(3-((benzyloxy)-carbonyl)-5-oxooxazolidin-4-yl)acetic acid with aminoacid esters. One product is an expected dipeptide, the isomeric one is an N-hydroxymethylamino succinimide – a product of methylene bridge cleavavge. Steric bulkness of aminoacid esters favors the formation of a peptide, however the reaction selectivity is quite unpredicatable. Moreover, the precise structure assignement requires high-temperature NMR experiments.

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18

Journal, Baghdad Science. "Synthesis and Evaluation of Antimicrobial activity of several new Maleimides to Benzothiazole moiety." Baghdad Science Journal 10, no. 3 (2013): 658–72. http://dx.doi.org/10.21123/bsj.10.3.658-672.

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In this work, a series of new maleimides linked to substituted benzothiazole moiety were synthesized. Synthesis of these new cyclic imides were performed via three steps, the first one involved preparation of a series of 2-aminobenzothiazole substituted with different substituents via reaction of different primary aromatic amines with ammonium thiocyanate and bromine in glacial acetic acid. The prepared 2- amino benzothiozoles were introduced in the second step in reaction with maleic anhydride producing a series of N-(substituted benzothiazole-2-yl) maleamic acids.The resulted maleamic acids

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19

Azzawi, Ahlam Marouf AL, and Suroor Abdul Rhahman Mahdi. "Synthesis and Evaluation of Antimicrobial activity of several new Maleimides to Benzothiazole moiety." Baghdad Science Journal 10, no. 3 (2013): 658–72. http://dx.doi.org/10.21123/bsj.2013.10.3.658-672.

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In this work, a series of new maleimides linked to substituted benzothiazole moiety were synthesized. Synthesis of these new cyclic imides were performed via three steps, the first one involved preparation of a series of 2-aminobenzothiazole substituted with different substituents via reaction of different primary aromatic amines with ammonium thiocyanate and bromine in glacial acetic acid. The prepared 2- amino benzothiozoles were introduced in the second step in reaction with maleic anhydride producing a series of N-(substituted benzothiazole-2-yl) maleamic acids.The resulted maleamic acids

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20

Lu, Ying, JiaYin Li, MiLu Li, Xia Hu, Jun Tan, and Zhong Hua Liu. "Efficient Counter-Current Chromatographic Isolation and Structural Identification of Two New Cinnamic Acids from Echinacea Purpurea." Natural Product Communications 7, no. 10 (2012): 1934578X1200701. http://dx.doi.org/10.1177/1934578x1200701026.

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Two new cinnamic acids, 2- O-caffeoyl-3- O-isoferuloyltartaric (3), and 2, 3-di- O-isoferuloyltartaric acid (5), along with three known caffeic acids, cichoric acid (1), 2- O-caffeoyl-3- O-feruloyltartaric acid (2) and 2- O- caffeoyl-3- O-p-coumaroyltartaric acid (4), have been successfully isolated and purified from Echinacea purpurea. In this study, we investigated an efficient method for the preparative isolation and purification of cinnamic acids from E. purpurea by high-speed counter-current chromatography (HSCCC). The separation was performed using a two-phase solvent composed of n-hexan

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21

Lynch, DE, G. Smith, KA Byriel, CHL Kennard, AK Whittaker, and JV Hanna. "Molecular Cocrystals of Carboxylic Acids. XVII. Spectral Characterization of the Adducts of Triphenylphosphine Oxide With Substituted Phenoxyacetic Acids and the Crystal Structure of the 1 : 1 Adduct With (4-Chloro-2-methylphenoxy)acetic Acid." Australian Journal of Chemistry 47, no. 7 (1994): 1401. http://dx.doi.org/10.1071/ch9941401.

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A series of 1:1 molecular adducts of triphenylphosphine oxide ( tppo ) with substituted phenoxyacetic acids has been prepared and characterized by using infrared, solid-state 1H and 31P n.m.r. spectroscopy, and X-ray powder diffraction methods. The crystal structure of one of these, with the herbicidally active (4-chloro-2-methylphenoxy)acetic acid ( mcpa ),[( tppo )( mcpa )], has been determined by X-ray diffraction methods. This compound is isomorphous with the tppo adduct of (2,4-dichlorophenoxy)acetic acid. The title compound has two independent and different molecular adducts in the asymm

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22

Mayangsari, Cholivia, Gunanti Mahasri, and Ahmad Shofy Mubarak. "Collagen Extraction from Red Snapper (Lutjanus malabaricus) Scales via Hydroextraction: Toward Nanocollagen Development." Journal of Marine and Coastal Science 14, no. 2 (2025): 101–14. https://doi.org/10.20473/jmcs.v14i2.72271.

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Generally, collagen is isolated using acid, base and enzymatic hydrolysis methods. However, this has the constraint of the length of time for the release of procollagen to produce collagen. Acetic acid hydrolysis combined with the hydroextraction method is one alternative to produce quality collagen. The use of acetic acid in the extraction of red snapper scales (Lutjanus malabaricus) will produce H+ ions to release procollagen in the raw material. The study aims to evaluate the potential of red snapper (L. malabaricus) scales as a collagen source through the hydroextraction method for the dev

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23

Cihanoğlu, Aydın, Gönül Gündüz, and Meral Dükkancı. "Influence of ultrasound on the heterogeneous Fenton-like oxidation of acetic acid." Water Science and Technology 76, no. 10 (2017): 2793–801. http://dx.doi.org/10.2166/wst.2017.416.

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Abstract The main objective of this study is to investigate the effect of ultrasound on the heterogeneous Fenton-like oxidation of acetic acid, which is one of the most resistant carboxylic acids to oxidation. For this purpose, firstly, the degradation of acetic acid was examined by using ultrasound alone and the effects of different parameters such as: type of sonication system, ultrasonic power, and addition of H2O2 were investigated on the degradation of acetic acid. There was no chemical oxygen demand (COD) reduction in the presence of sonication alone. In the presence of the heterogeneous

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24

Roy, Siddhartha, Desh Deepak Singh, and M. Vijayan. "X-ray studies on crystalline complexes involving amino acids and peptides. XLII. Adipic acid complexes of L- and DL-arginine and supramolecular association in arginine–dicarboxylic acid complexes." Acta Crystallographica Section B Structural Science 61, no. 1 (2005): 89–95. http://dx.doi.org/10.1107/s0108768104030010.

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The adipic acid complexes of DL-arginine and L-arginine are made up of zwitterionic, singularly positively charged arginium ions and doubly negatively charged adipate ions, with a 2:1 stoichiometry. One of the two crystallographically independent arginium ions in the L-arginine complex has a conformation hitherto unobserved in crystal structures containing the amino acid. In the present study the structural data on arginine complexes of saturated dicarboxylic acids with 0–5 C atoms separating the two carboxyl functions are given. In terms of molecular aggregation, formic and acetic acid comple

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25

BABUCHOWSKI, ANDRZEJ, EARL G. HAMMOND, and BONITA A. GLATZ. "Survey of Propionibacteria for Ability to Produce Propionic and Acetic Acids." Journal of Food Protection 56, no. 6 (1993): 493–96. http://dx.doi.org/10.4315/0362-028x-56.6.493.

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Ninety strains of Propionibacterium were screened for their ability to lower the pH of maltose broths. Strains attaining a pH &lt;5 in enriched maltose broth consisted of 12 strains of Propionibacterium acidipropionici, 2 of Propionibacterium jensenii, and 3 of Propionibacterium thoenii. These 17 strains were further tested for their ability to produce propionic acid on maltose, lactose, lactate, and starch and their ability to produce propionic acid on various concentrations of maltose and lactate between 0.5 and 5.0%. On the basis of these tests, strains were selected to be tested in a b

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26

Sladek, Alexander, Wolfgang Schneider, Klaus Angermaier, Andreas Bauer, and Hubert Schmidbaur. "Polynuclear Gold(I) Complexes of Mercaptocarboxylic Acids." Zeitschrift für Naturforschung B 51, no. 6 (1996): 765–72. http://dx.doi.org/10.1515/znb-1996-0602.

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Abstract In a search for air-stable and water-soluble mercapto compounds of gold with a high gold content, benzylthiol, a-m ercapto-acetic acid, β-mercapto-propionic acid, and thiosalicylic acid were converted into aurated sulfonium salts by treatment with reagents of the type [(R3P)Au]3O+ BF4- or [(R3)P)Au]+ BF4-. - BzSH served as a mono-functional model thiol, which was converted into BzS[Au(PMe3)]2+ BF4- (1). The small tertiary phosphine was chosen in order to minimize steric effects. In the crystal the cations are associated into centrosymmetrical dimers through short Au-A u contacts (auri

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Buchanan-Smith, J. G. "An investigation into palatability as a factor responsible for reduced intake of silage by sheep." Animal Science 50, no. 2 (1990): 253–60. http://dx.doi.org/10.1017/s0003356100004700.

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ABSTRACTTo separate ingestive factors involving palatability from post-ingestive factors responsible for forage intake being depressed by ensiling, silages were evaluated using sham-fed animals. Protocol for all experiments was to formulate low dry matter (DM) silages from a high DM lucerne silage reconstituted with either water, solutions containing constituents commonly found in silage, or extracts of low DM silage. Solutions of silage constituents were adjusted before reconstitution to a pH typical of silage. Tests were performed by offering silages one at a time once daily to oesophageal f

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Berrío Escobar, Jhon Fernando, Victor Hugo Arango Carmona, Elkin Galeano Jaramillo, et al. "Synthesis and cytotoxic activity of tri-acyl ester derivatives of uridine in breast cancer cells." Ars Pharmaceutica (Internet) 57, no. 4 (2016): 183–91. http://dx.doi.org/10.30827/ars.v57i4.5560.

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Aims: Synthesize tri-acyl ester derivatives of uridine, and evaluate its cytotoxicity against breast cancer cells line. Methods: The tri-esterified uridine derivatives were obtained through Steglich esterification reaction by fatty and aromatic acids, and with acetic anhydride. An acetonide derivative from uridine was prepared with acid catalysis. Compounds were characterized by NMR spectroscopy (1H NMR and 13C NMR), and mass spectrometry. Derivatives were assessed in chinese hamster ovary (CHO-K1) and human breast cancer (MCF-7) cell lines. Results: Five tri-acyl ester derivatives of uridine

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BREIDT, F., J. S. HAYES, and R. F. McFEETERS. "Independent Effects of Acetic Acid and pH on Survival ofEscherichia coli in Simulated Acidified Pickle Products†‡." Journal of Food Protection 67, no. 1 (2004): 12–18. http://dx.doi.org/10.4315/0362-028x-67.1.12.

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Our objective was to determine the effects of organic acids and pH on the rate at which selected strains ofEscherichia coli O157:H7 die in acid solutions representative of acidified pickle products (pH &lt; 4.6). We used gluconic acid/sodium gluconate (pKa = 3.7) as a noninhibitory buffer to maintain pH at selected values in the absence of other organic acids. This was possible because we found that the inhibitory effects of this acid onE. coli strains at pH 3.1 were independent of acid concentration over a range of 2 to 200 mM. By this method, the lethal effects of acetic acid solutions (

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Sietmann, Rabea, Elke Hammer, Michael Specht, Carl E. Cerniglia, and Frieder Schauer. "Novel Ring Cleavage Products in the Biotransformation of Biphenyl by the Yeast Trichosporon mucoides." Applied and Environmental Microbiology 67, no. 9 (2001): 4158–65. http://dx.doi.org/10.1128/aem.67.9.4158-4165.2001.

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ABSTRACT The yeast Trichosporon mucoides, grown on either glucose or phenol, was able to transform biphenyl into a variety of mono-, di-, and trihydroxylated derivatives hydroxylated on one or both aromatic rings. While some of these products accumulated in the supernatant as dead end products, the ortho-substituted dihydroxylated biphenyls were substrates for further oxidation and ring fission. These ring fission products were identified by high-performance liquid chromatography, gas chromatography-mass spectrometry, and nuclear magnetic resonance analyses as phenyl derivatives of hydroxymuco

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Raskil’dina, Gul’nara Z., Evgeniya A. Yakovenko, Luisa M. M. Mryasova, and Simon S. Zlotskii. "SYNTHESIS AND HERBICID ACTIVITY OF ARYLOXYACETIC ACIDS AND AMIDES OF ARYLOXY ACETIC ACIDS CONTAINING CYCLOACETAL FRAGMENT." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 1 (2018): 91–97. http://dx.doi.org/10.6060/ivkkt.20196201.5753.

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The herbicidal activity of esters and amides based on commercially available phenoxy chlorides and 2,4-dichlorophenoxyacetic acids was studied. Esters of 2,2-methyl-4-hydroxymethyl-1,3-dioxolane, 5-ethyl-5-hydroxymethyl-1,3-dioxane and 1,3-dioxolan-4-ylmethanol and 1,3-dioxane-5 -ol (glycerin formulas), as well as amides containing gem-dichlorocyclopropane and 1,3-dioxolane fragments were obtained. The acid chlorides, 1,3-dioxacycloalkanes and secondary amines were prepared according to standard basic methods. Esters and amides were synthesized from these starting compounds in a short time and

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Węsierska, Ewelina, Joanna Sobolewska-Zielińska, Małgorzata Pasternak, et al. "Biochemical Properties Affecting the Nutritional Quality, Safety, and Aroma of Dry-Cured Products Manufactured from Meat of Rare Native Pig Breeds." Foods 10, no. 7 (2021): 1597. http://dx.doi.org/10.3390/foods10071597.

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The aim of study was to compare the biochemical properties affecting the nutritional quality, safety, and aroma of dry-cured products manufactured from valuable meat of rare native pig breeds: Pulawska (Pul) and Zlotnicka Spotted (ZS). The count of lactic acid bacteria (4.4 log cfu/g) and the release of palmitic (23.1% and 25.9%), oleic (44.1% and 42.2%), and linoleic acids (8.3% and 7.8%), as well as arginine (30.0 and 44.3 mg/kg), histidine (25.8 and 20.6 mg/kg), and lysine (26.8–22.9 mg/kg), shaped the final pH (5.3 and 5.4) in Pul and ZS products during the 4 week maturing, respectively. L

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El-Shahawy, Tarek Abd El-Ghafar. "Chemicals with a natural reference for controlling water hyacinth, Eichhornia crassipes (Mart.) Solms." Journal of Plant Protection Research 55, no. 3 (2015): 294–300. http://dx.doi.org/10.1515/jppr-2015-0041.

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AbstractLife cannot exist without water. Appropriate management of water, from the water’s source to its utilization, is necessary to sustain life. Aquatic weeds pose a serious threat to aquatic environments and related eco-environments. Short- and long-term planning to control aquatic weeds is extremely important. Water hyacinth,Eichhornia crassipes(Mart.) Solms, is one of the world’s worst pests with a bad reputation as an invasive weed. In this study we are seeking the possibility of using certain chemicals with a natural background, for controlling water hyacinth since there is a delicate

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Gašparová, Renata, Pavol Koiš, Margita Lácová, Silvia Kováčová, and Andrej Boháč. "Synthesis, reactions and antineoplastic activity of 3-(2-oxo-2H-chromen-3-yl)-2-oxo-2H,5H-pyrano[3,2-c]chromene derivatives." Open Chemistry 11, no. 4 (2013): 502–13. http://dx.doi.org/10.2478/s11532-012-0184-1.

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AbstractThe key 3-(2-oxo-2H-chromen-3-yl)-2-oxo-2H,5H-pyrano[3,2-c]chromen-5-yl acetates 3 were synthesized in high yields by cyclocondensation of 4-oxo-4H-chromen-3-carbaldehydes 1 with coumarin-3-acetic acids 2 under mild conditions. The reaction pathway involves aldol condensation and subsequent intramolecular lactonization to afford 2-oxo-2H,5H-pyrano[3,2-c]chromene skeleton 3. Further treatment of acetates 3 with alcohols, water or nitrogen containing compounds led to 5-alkoxy-, 5-hydroxy- or 5-acylamino-2H,5H-pyrano[3,2-c]chromen-2-ones 4-6 via nucleophilic substitution of acetyloxy grou

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Zekic, M., A. Radonic, S. Radman, and I. Uremovic. "Volatile compounds of Croatian cheese in a lamb skin sack prepared from a mixture of goat's and cow's milk." Food Research 8, no. 3 (2024): 277–83. http://dx.doi.org/10.26656/fr.2017.8(3).265.

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Volatile aroma compounds are one of the main parameters in consumer choice and acceptance of cheese. The traditional way of making cheese, still preserved in Croatia, is the anaerobic ripening of curds in a lamb or goat sack. Cheeses produced in such a way have a specific aroma. The objective of this study was to determine the volatile compounds of Croatian cheese in a lamb skin sack prepared from a mixture of goat's and cow's milk and relate them with the aroma of this traditional cheese. The cheese extracts were obtained by headspace solid-phase microextraction (HS-SPME) and ultrasonic solve

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Annor-Gyamfi, Joel K., and Richard A. Bunce. "4H-Benzo[d][1,3]oxazin-4-ones and Dihydro Analogs from Substituted Anthranilic Acids and Orthoesters." Molecules 24, no. 19 (2019): 3555. http://dx.doi.org/10.3390/molecules24193555.

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A one-pot route to 2-alkyl and 2-aryl-4H-benzo[d][1,3]oxazin-4-ones (also known as 4H-3,1-benzoxazin-4-ones) has been developed and studied. The method involves the reaction of aryl-substituted anthranilic acids with orthoesters in ethanol catalyzed by acetic acid. Additionally, we have also investigated the reaction under microwave conditions. Not all of the substrates were successful in yielding the target heterocycles as some of the reactions failed to undergo the final elimination. This process led to the isolation of (±)-2-alkyl/aryl-2-ethoxy-1,2-dihydro-4H-benzo[d][1,3]oxazin-4-ones. The

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Polívka, Zdeněk, Irena Lichá, Petr Taufmann, Emil Svátek, Jiří Holubek, and Miroslav Protiva. "Synthesis of 3-(6,11-dihydrodibenzo[b,e]thiepin-11-ylidene)propanoic acid and related compounds." Collection of Czechoslovak Chemical Communications 52, no. 6 (1987): 1566–82. http://dx.doi.org/10.1135/cccc19871566.

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The alcohol XIa, obtained by reaction of dibenzo[b,e]thiepin-11(6H)-one with vinylmagnesium bromide, was transformed by treatment with hydrogen bromide in acetic acid to the bromo compound XIIa which was converted via the nitrile XIIIa to the title acid VIIIa. The pure (E)-isomer was prepared and correlated via the dimethylamide XVIIIa with (E)-prothiadene (Ia). Similar procedures in the 2-methyl-6,11-dihydrodibenzo[b,e]thiepin and 10,11-dihydrodibenzo[a,d]cycloheptene series afforded the acids VIIIb and IV. The acids VIIIab were oxidized with hydrogen peroxide to the sulfoxides IXab and to th

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Li, Guan-Xi, Xiao-Qin Wu, Jian-Ren Ye, and He-Chuan Yang. "Characteristics of Organic Acid Secretion Associated with the Interaction betweenBurkholderia multivoransWS-FJ9 and Poplar Root System." BioMed Research International 2018 (December 31, 2018): 1–12. http://dx.doi.org/10.1155/2018/9619724.

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The objective of this study was to investigate whether plant-bacteria interaction affects the secretion of organic acids by both organisms and to assess whether the production of IAA by the bacterium increases the secretion of organic acids by root exudates, and if the stress produced by low available phosphorus (P) affects the production of organic acids by bacteria, by roots, or by root exudates in presence of bacterial cultures. With this purpose, we used as a biological model poplar plants and one strain ofBurkholderia multivoransable to solubilize P. High performance liquid chromatography

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Kanazawa, Akio, Masanori Aida, Yasuto Yoshida, et al. "Effects of Synbiotic Supplementation on Chronic Inflammation and the Gut Microbiota in Obese Patients with Type 2 Diabetes Mellitus: A Randomized Controlled Study." Nutrients 13, no. 2 (2021): 558. http://dx.doi.org/10.3390/nu13020558.

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The aim of this study was to investigate the effects of 24-week synbiotic supplementation on chronic inflammation and the gut microbiota in obese patients with type 2 diabetes. We randomized 88 obese patients with type 2 diabetes to one of two groups for 24 weeks: control or synbiotic (Lacticaseibacillus paracasei strain Shirota (previously Lactobacillus casei strain Shirota) and Bifidobacterium breve strain Yakult, and galactooligosaccharides). The primary endpoint was the change in interleukin-6 from baseline to 24 weeks. Secondary endpoints were evaluation of the gut microbiota in feces and

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Reyes Garcia, Luis Jesus. "Hygienic vulvo-vaginal habits, contraceptive use, and bacterial vaginosis." ARS MEDICA Revista de Ciencias Médicas 49, no. 1 (2024): 5–6. http://dx.doi.org/10.11565/arsmed.v49i1.2044.

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Dear Editor: Bacterial vaginosis is a common health problem leading to millions of worldwide medical consultations yearly (Morales, 2015). It is characterized by the presence of abundant and malodorous vaginal discharge and in some cases, is accompanied by itching, dysuria, and dyspareunia (Hakakha et al., 2002). This condition is associated with an imbalance in the vaginal bacterial flora (reduction in Lactobacilli and predominance of Gardnerella vaginalis and other anaerobic bacteria). One concerning aspect of this condition is that approximately 75% of the patients who undergo gynecological

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Gergoric, Marino, Christophe Ravaux, Britt-Marie Steenari, Fredrik Espegren, and Teodora Retegan. "Leaching and Recovery of Rare-Earth Elements from Neodymium Magnet Waste Using Organic Acids." Metals 8, no. 9 (2018): 721. http://dx.doi.org/10.3390/met8090721.

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Over the last decade, rare-earth elements (REEs) have become critical in the European Union (EU) in terms of supply risk, and they remain critical to this day. End-of-life electronic scrap (e-scrap) recycling can provide a partial solution to the supply of REEs in the EU. One such product is end-of-life neodymium (NdFeB) magnets, which can be a feasible source of Nd, Dy, and Pr. REEs are normally leached out of NdFeB magnet waste using strong mineral acids, which can have an adverse impact on the environment in case of accidental release. Organic acids can be a solution to this problem due to

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BANI, TALAPATRA, Kumar Mandal Sudipta, Biswas Kallolmay, Chakrabarti Ramaprasad та K. Talapatra Sunil. "Reactions of 4-hydroxycoumarin with some α,β-unsaturated carbonyls and 1,3-dicarbonyls : trapping of 4-hydroxycoumarin tautomers; formation of a pimelic acid derivative and a novel bicyclo compound". Journal of Indian Chemical Society Vol. 78, Oct-Dec 2001 (2001): 765–71. https://doi.org/10.5281/zenodo.5910727.

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Centre of Advanced Studies on Natural Products, Department of Chemistry, University of Calcutta, University College of Science, 92, Acharya Praful la Chandra Road, Kolkata-700 009, India <em>E-mail</em> : talapatrask@yahoo.com <em>Manuscript received 31 August 2001</em> 4-Hydroxycoumarin (1) being endowed with both nucleophilic and electrophilic properties furnishes the dimeric coumarin derivative 3 in a pyridine catalyzed self-condensation process; while its attempted morpholine catalyzed self-condensation yields no dimeric coumarin derivative, but leads to the formation of the enamine deriva

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Byriel, KA, DE Lynch, G. Smith, and CHL Kennard. "Molecular Cocrystals of Carboxylic-Acids. V. The Crystal-Structures of (2-Carboxy-phenoxy)acetic Acid and Its 1 : 1 Adduct With 4-Aminobenzoic Acid." Australian Journal of Chemistry 44, no. 10 (1991): 1459. http://dx.doi.org/10.1071/ch9911459.

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The crystal structures of (2-carboxyphenoxy)acetic acid (cpaa) (1) and its 1 : 1 adduct [( cpaa )(4-aba)] (2) with 4-aminobenzoic acid have been determined by X-ray diffraction and refined to residuals R 0.077, (1), and 0.051, (2), for 783 and 1062 observed reflections, respectively. The dicarboxylic acid (1) is extended into a one-dimensional zig-zag polymer by hydrogen bonding through the two acid groups [O…O, 2.67(1)Ǻ]. The adduct (2) represents the first example of a phenoxyalkanoic involved in a hetero-dimer association through the conventional cyclic hydrogen-bonding system [O…O, 2.54, 2

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Zavhorodnii, M., N. Derevianko, T. Shkopynska, M. Kornet, and O. Brazhko. "Influence of derivatives of 2-((6-r-quinolin-4-yl)thio)acetic acid on rhizogenesis of Paulownia clones." Regulatory Mechanisms in Biosystems 13, no. 3 (2022): 213–18. http://dx.doi.org/10.15421/022227.

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In recent years, the demand for effective and low-toxic stimulators of rhizogenesis, which are used in microclonal propagation of plants, has been increasing in Ukraine. One of the promising directions in the search for effective compounds is molecular modeling based on known natural and synthetic compounds. The development of new highly effective and low-toxic biologically active compounds is largely based on derivatives of nitrogen-containing heterocycles, and quinoline occupies a significant place among them. Modern methods of chemometric analysis make it possible to find certain regulariti

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Patel, Alok, Ulrika Rova, Paul Christakopoulos, and Leonidas Matsakas. "Assessment of Fatty Acids Profile and Omega-3 Polyunsaturated Fatty Acid Production by the Oleaginous Marine Thraustochytrid Aurantiochytrium sp. T66 Cultivated on Volatile Fatty Acids." Biomolecules 10, no. 5 (2020): 694. http://dx.doi.org/10.3390/biom10050694.

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Thraustochytrids are considered natural producers of omega-3 fatty acids as they can synthesize up to 70% docosahexaenoic acids (DHA) of total lipids. However, commercial and sustainable production of microbial DHA is limited by elevated cost of carbon substrates for thraustochytrids cultivation. This problem can be addressed by utilizing low-cost renewable substrates. In the present study, growth, lipid accumulation and fatty acid profiles of the marine thraustochytrid Aurantiochytrium sp. T66 (ATCC-PRA-276) cultivated on volatile fatty acids (C1, formic acid; C2, acetic acid; C3, propionic a

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Dub, S. A., N. V. Cherednichenko, D. V. Kiseleva, N. P. Gorbunova, T. Ya Gulyaeva, and L. K. Deryugina. "Trace element behaviour in acidic leachates (acetic, nitric and hydrochloric) from siliciclastic-carbonate rocks of the Upper Riphean Uk formation in the Southern Urals." LITHOSPHERE (Russia) 19, no. 6 (2020): 919–44. http://dx.doi.org/10.24930/1681-9004-2019-19-6-919-944.

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Research subject. 14 samples of limestone and one sample of carbonate-siliciclastic rock from siliciclastic-carbonate deposits of the Upper Riphean Uk Formation (the Southern Urals) were studied.Methods. Mineral and chemical composition of the samples were determined; the main tool for detecting the concentrations of trace elements was the ICPMS method. X-ray diffraction analysis was carried out using a Shimadzu XRD-7000 diffractometer, the content of major (rock-forming) oxides in bulk samples was established by X-ray fluorescence spectrometry on the SRM-35 and Shimadzu XRF 1800 spectrometers

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Smith, Graham, and Daniel E. Lynch. "Crystal structures and hydrogen bonding in the anhydrous tryptaminium salts of the isomeric (2,4-dichlorophenoxy)acetic and (3,5-dichlorophenoxy)acetic acids." Acta Crystallographica Section E Crystallographic Communications 71, no. 6 (2015): 671–74. http://dx.doi.org/10.1107/s205698901500907x.

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The anhydrous salts of 2-(1H-indol-3-yl)ethanamine (tryptamine) with isomeric (2,4-dichlorophenoxy)acetic acid (2,4-D) and (3,5-dichlorophenoxy)acetic (3,5-D), both C10H13N2+·C8H5Cl2O3−[(I) and (II), respectively], have been determined and their one-dimensional hydrogen-bonded polymeric structures are described. In the crystal of (I), the aminium H atoms are involved in three separate inter-species N—H...O hydrogen-bonding interactions, two with carboxylate O-atom acceptors and the third in an asymmetric three-centre bidentate carboxylateO,O′chelate [graph setR12(4)]. The indole H atom forms a

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Ulumiah, Miftakhul, Mochammad Amin Alamsjah, and Kustiawan Tri Pursetyo. "The Effect of Different pH in Extraction Process Against Physicochemical Properties of Refined Iota Carrageenan from Eucheuma spinosum Seaweed." Journal of Marine and Coastal Science 8, no. 1 (2020): 14. http://dx.doi.org/10.20473/jmcs.v8i1.21142.

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Gelatin is a simple protein obtained from the partial hydrolysis of collagen from the skin, bones, joints and connective tissue of animals. One potential material for the manufacture of gelatin is fish bone milkfish (Chanos chanos). Gelatin derived from fish bones with acid process is able to change the triple helix collagen fibers into a single chain, whereas the solvent base only produce double chain. Demineralization of bone or fish skin should use a weak acid is acetic acid, because when using strong acids will produce a strong scent and color gelatin becomes dark. This study aims to deter

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Saitkulov, Foziljon Ergashevich Elmuradov Burkhon Zhuraevich O'lmasova Komilakhon Mo'minjon qizi Alijonova Asalxon Odiljon qizi. "PREPARATION OF A MIXED COORDINATION COMPOUND COBALT-II NITRATE HEXAHYDRATE WITH QUINAZOLINE-4-ONE AND 3-INDOLYLACETIC ACID ON "AMBER" PLANTS OF THE PHASEOLUS AUREUS VARIETY." SCIENCE AND INNOVATION IN THE EDUCATION SYSTEM 2, no. 1 (2023): 81–87. https://doi.org/10.5281/zenodo.7536612.

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<em>The biochemical effects of the coordination compound of cobalt-II nitrate quinazolin-4-one with </em><em>3-indolyl acetic acid </em><em>in the “amber” </em><em>plants </em><em>grades Phaseolus aureus have been studied. Cobalt is an important trace element for plants and an important biogenic element in the soil, mainly in the form of the Co<sup>2+</sup> cation, which participates in redox reactions in plant organisms for the implementation of various mineral and organic compounds. Cobalt compounds are mainly soluble in mineral acids, so we want to show that the coordination com

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Syeda, Sameena Aziz, and Razzak Abdul. "Adsorption of Acidic pollutants from Water using Biosorbents." International Journal of Trend in Scientific Research and Development 2, no. 2 (2018): 801–5. https://doi.org/10.31142/ijtsrd9495.

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A huge amount of waste is generated from the industries which cause the pollution of water this waste is generated by the industries in large quantities. Acids are one such of a waste generated by these industries in the water bodies and causes an adverse impact on the aquatic ecosystems and inturn causes an negative impact on the human population and because of the harmful effects caused by these acids there is a need for the removal of these acidic pollutants from our water bodies. As these acids are water soluble 1 and colorless we need a technique to separate these acidic pollutants from w

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