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Journal articles on the topic 'Methyl compounds'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2025

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1

Baron, ML, LL Martin, ID Rae, PM Simmonds, and ML Woolcock. "Relaxation Processes in Aromatic Methyl Groups. II. Methyl-Methyl Nuclear Overhauser Enhancements." Australian Journal of Chemistry 43, no. 4 (1990): 741. http://dx.doi.org/10.1071/ch9900741.

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A range of compounds with methyl groups disposed ortho and peri on heteroaromatic frameworks have been prepared, and T1 values and methyl-methyl Overhauser effects measured for them. Most of the n.O.e . Values were ≤6%, but two examples of methyls flanked by two others exhibited values of 9% (6-hydroxy-4,4,5,7-tetramethyl-3,4-dihydro-2H-benzopyran-2-one) and 15% (1,4,5,8,9-pentamethylcarbazole).

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2

Sarvaiya, Nikulsinh, Hitesh Samata, Sheetal Gulati, and H. Patel. "SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY OF PYRAZOLE-PYRIMIDONE CLUBBED DERIVATIVES." Rasayan Journal of Chemistry 15, no. 01 (2022): 564–68. http://dx.doi.org/10.31788/rjc.2022.1516656.

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4-(2-(1-(4-aryl-3-(furan-2-yl(hydroxy)methyl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carbonyl)-3-methyl5-oxo-1H-pyrazol-4(5H)-ylidene)hydrazinyl)-N-(thiazol-2-yl) benzene sulphonamides (2a-e) were synthesised by condensation of 4-(2-(1-(4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carbonyl)-3-methyl-5-oxo-1Hpyrazol-4(5H)-ylidene) hydrazinyl)-N-(thiazol-2-yl) benzene sulphonamide (1a-e) with furfuraldehyde. The structures of all the compounds (2a-e) were characterized duly. The compounds were also monitored for antimicrobial activity.

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3

Astiti, Ni Putu Adriani, and Yan Ramona. "GC-MS Analysis of Active and Applicable Compounds in Methanol Extract of Sweet Star Fruit (Averrhoa carambola L.) Leaves." HAYATI Journal of Biosciences 28, no. 1 (2021): 12. http://dx.doi.org/10.4308/hjb.28.1.12.

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The leaves of star fruit plants (Averrhoa carambola) have been traditionally used to cure many diseases, such as hypertension and fever. Besides, the leaves of this plant have also widely been used as the main raw material in lawar (a Balinese traditional food) making. In this research, the methanol extract of this plant leaves was analyzed and identified for active compound contents. The main objective of this research was to investigate types of possible active and applicable compounds contained in such leaves, previously extracted/macerated in methanol solution. Analysis was conducted by ap

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4

Berezina, Nadezhda, and Egor Kolesov. "Assessment of polyfunctional macrocyclic compounds in solution by cryoscopic method." From Chemistry Towards Technology Step-By-Step 4, no. 3 (2023): 76–80. http://dx.doi.org/10.52957/2782-1900-2024-4-3-76-80.

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The article considers the synthesis of meso-tetrakis(1'-methyl-pyrid-4-yl)porphyrin tetratosylate and meso-tetrakis(1'-methyl-carboxymethylpyrid-4-yl)porphyrin tetrabromide. The authors qualified the porphyrin ligands in terms of the electron and 1H NMR spectroscopy. The research determines the decrease of freezing point (ΔTfr) of aqueous solutions of porphyrins, as well as a model N-methyl-pyridinium salt (1 methyl-pyridinium iodide). We used the obtained experimental values of ΔT3 to determine the isotonic coefficient. The obtained results indicate the compounds are almost completely dissoci

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5

Chandrima Debi and Vipin Parkash. "Influence of microbial bioinoculants on the accumulation of new phytocompounds in Oroxylum indicum (L.) Benth. ex Kurz." GSC Biological and Pharmaceutical Sciences 13, no. 3 (2020): 228–43. http://dx.doi.org/10.30574/gscbps.2020.13.3.0413.

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The seedlings of Oroxylum indicum were inoculated with plant growth promoting microbes (PGPMs) mainly, Glomus mosseae, Trichoderma harzianum and Pseudomonas putida both alone and consortium. The GCMS analysis of the methanolic root extract of inoculated seedlings of O. indicum showed that seedlings treated with mixed consortium of mycorrhizal fungi, bacteria and fungus showed the presence of maximum number of phytocompounds. The GC-MS analysis of control seedlings showed presence of 55 compounds where three new compounds were found i.e. 2-Cyclobutene-1-Carboxamide; Tetradecanoic Acid, 10, 13-d

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6

Chandrima, Debi, and Parkash Vipin. "Influence of microbial bioinoculants on the accumulation of new phytocompounds in Oroxylum indicum (L.) Benth. ex Kurz." GSC Biological and Pharmaceutical Sciences 13, no. 3 (2020): 228–43. https://doi.org/10.5281/zenodo.4415241.

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The seedlings of <em>Oroxylum indicum</em> were inoculated with plant growth promoting microbes (PGPMs) mainly, <em>Glomus mosseae</em>, <em>Trichoderma harzianum</em> and<em> Pseudomonas putida </em>both alone and consortium. The GCMS analysis of the methanolic root extract of inoculated seedlings of <em>O. indicum </em>showed that seedlings treated with mixed consortium of mycorrhizal fungi, bacteria and fungus showed the presence of maximum number of phytocompounds. The GC-MS analysis of control seedlings showed presence of 55 compounds where thr

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7

Shafiq, Nusrat, Azhar Rasul, Sonia Ashraf, et al. "A Synthesis and Pharmaceutical Evaluation of Pyrimidine Derivatives and Their Docking Studies." FRONTIERS IN CHEMICAL SCIENCES 1, no. 2 (2020): 19–28. http://dx.doi.org/10.52700/fcs.v1i2.9.

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A series of halogenated pyrimidine derivatives tetrahydropyrimidine; Ethyl-6-methyl2-oxo-4-phenyl-1,3,4-tetrahydropyrimidine-5-carboxylate (10a), Ethyl-4-(3-Chlorophenyl)-6-methyl-2-oxo-1,3,4-tetrahydropyrimidine-5- carboxylate (10b) andEthyl-4-(4-Chlorophenyl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate (10c) were synthesized by using new strategy in “Grindstone protocol “toget high yield in short time. The synthesized compounds werecharacterized by 1HNMR, 13C-NMR and Mass spectral data and evaluated for their anticanceractivityagainsthuman HepG2 Liver cell lines, for antifungal

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8

Nounah, Issmail, Malika Chbani, Bertrand Matthäus, Zoubida Charrouf, Ahmed Hajib, and Ina Willenberg. "Profile of Volatile Aroma-Active Compounds of Cactus Seed Oil (Opuntia ficus-indica) from Different Locations in Morocco and Their Fate during Seed Roasting." Foods 9, no. 9 (2020): 1280. http://dx.doi.org/10.3390/foods9091280.

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Volatile compounds from oils extracted from cactus seeds (Opuntia ficus-indica) of five regions of Morocco were analyzed by dynamic headspace-GC/MS. Aroma active compounds were characterized by olfactometry. A total of 18 compounds was detected with hexanal, 2-methyl propanal, acetaldehyde, acetic acid, acetoin and 2,3-butanedione as most abundant. Olfactometric analysis showed that those compounds are aroma active; therefore, cactus seed oil flavor can be attributed to those compounds. Moreover, the effect of roasting of cactus seeds on the composition of volatile compounds in the oil was inv

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9

Journal, Baghdad Science. "Synthesis of New Amide and ThioUrease Compounds." Baghdad Science Journal 4, no. 3 (2007): 430–37. http://dx.doi.org/10.21123/bsj.4.3.430-437.

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The reaction of some new Schiff bases ( 2-[(2-Amino – ethylimino)-methyl]-R , 2-({2-[(R-benzylidene)-amino]-ethylimino}-methyl)-R with Benzoyl chloride or Acetyl chloride were carried out. Subsequent reactions of these products N-(2-Amino-ethyl)-N-[Chloro-(R) –methyl]-benzamide or N-(2-{?-[chloro-(R) –methyl]-amino}-ethyl)-N-[chloro-(R) –methyl]- benzamide with thiourea afforded thioureas compounds. The synthesized compounds were confirmed by their IR,UV,spectra and C.H.N. analysis.

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10

Javaid, Arshad, Iqra Haider Khan, and Malik F. H. Ferdosi. "ANTIMICROBIAL AND OTHER BIOACTIVE CONSTITUENTS OF Cannabis sativus ROOTS FROM PAKISTAN." JOURNAL OF WEED SCIENCE RESEARCH 27, no. 3 (2021): 359–68. http://dx.doi.org/10.28941/pjwsr.v27i3.984.

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Hemp (Cannabis sativa L.), a medicinal plant of family Cannabaceae, growing wildly in most of the rainfed areas of Punjab, Pakistan. In this study, phytochemical profile of methanolic extract of root was assessed through GC-MS analysis and various biologically active compounds were identified through literature survey. There were 14 compounds in the root extract. The most abundant compounds were γ-sitosterol (27.08%) and 9,12-octadecadienoic acid (Z,Z)-, methyl ester (24.09%) and hexadecanoic acid, methyl ester (21.81%). Other identified compounds were methyl stearate (5.51%), stigmasterol (5.

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11

Rádl, Stanislav, Viktor Zikán, and František Šmejkal. "Syntheses of 1, 2, and 9-methyl derivatives of 4,9-dihydro-3-methyl-4-oxo-1H(2H)-pyrazolo[3,4-b]quinoline and their antiviral activity." Collection of Czechoslovak Chemical Communications 50, no. 5 (1985): 1057–63. http://dx.doi.org/10.1135/cccc19851057.

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The paper describes syntheses of 4,9-dihydro-3-methyl-4-oxo-1H(2H)-pyrazolo[3,4-b]quinoline (Ia), its 1-methyl derivative (Ib), 2-methyl derivative (IIa), 9-methyl derivative (Ic), 1,9-dimethyl derivative (Id) and 2,9-dimethyl derivative (IIb). Sodium salts of compounds Ia, Ib, Ic and IIa were methylated with methyl iodide in dimethylformamide at room temperature, compounds Id and IIb were demethylated with pyridine hydrochloride. The compounds prepared were tested for antiviral activity in vivo in mice against influenza virus A2-Hongkong and the Encephalomyocarditis virus.

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12

Esteban-Torres, María, Inés Reverón, José Miguel Mancheño, Blanca de las Rivas, and Rosario Muñoz. "Characterization of a Feruloyl Esterase from Lactobacillus plantarum." Applied and Environmental Microbiology 79, no. 17 (2013): 5130–36. http://dx.doi.org/10.1128/aem.01523-13.

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ABSTRACTLactobacillus plantarumis frequently found in the fermentation of plant-derived food products, where hydroxycinnamoyl esters are abundant.L. plantarumWCFS1 cultures were unable to hydrolyze hydroxycinnamoyl esters; however, cell extracts from the strain partially hydrolyze methyl ferulate and methylp-coumarate. In order to discover whether the protein Lp_0796 is the enzyme responsible for this hydrolytic activity, it was recombinantly overproduced and enzymatically characterized. Lp_0796 is an esterase that, among other substrates, is able to efficiently hydrolyze the four model substr

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13

Ohno, Hiroyuki, Motoh Mutsuga, and Yoko Kawamura. "Identification and Quantitation of Volatile Organic Compounds in Poly(methyl methacrylate) Kitchen Utensils by Headspace Gas Chromatography/Mass Spectrometry." Journal of AOAC INTERNATIONAL 97, no. 5 (2014): 1452–58. http://dx.doi.org/10.5740/jaoacint.12-425.

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Abstract A headspace GC/MS method was developed for identification and quantitation of residual volatile organic compounds in poly(methyl methacrylate) (PMMA) kitchen utensils. A sample was cut into small pieces, then N,N-dimethylacetamide was added in a headspace vial and sealed. After storing for more than 1 day at room temperature, the vial was incubated for 1 h at 90°C, and the headspace gas was analyzed by GC/MS. In 24 PMMA kitchen utensils, 16 volatile organic compounds including methyl methacrylate, methyl acrylate, toluene, 2-methyl-1-butene, 2-methyl-2-butene, 2-methylpropanal, methyl

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14

Zhai, Xiao Xiao, Chuan Yun Xiao, Wei Jiang, Yun Long Chen, Yuan Qing Ding, and Gang Ren. "Isoprenylated Phenolics from Roots of Artocarpus heterophyllus." Natural Product Communications 12, no. 6 (2017): 1934578X1701200. http://dx.doi.org/10.1177/1934578x1701200622.

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Thirteen compounds were isolated from Artocarpus heterophyllus, including one new di-isoprenylated stilbene, (±)-artoheterin A (1), and twelve known isoprenylated phenolics, artocarbene (2), 3′,5′,2,4-tetrahydroxy-4′-(3-methyl-2-butenyl) stilbene (3), cudrastilbene (4), 3-(3-methyl-2-butenyl) luteolin (5), 5,7,2′,4′-tetrahydroxy-6-(3-methyl-2-butenyl) flavone (6), 6-(3-methyl-2-butenyl) apigenin (7), artochamin B (8), 5′-hydroxycudraflavone A (9), artonins A and B (10–11), heterophyllin (12), and 8-(3-methyl-2-butenyl)-6,7-dihydroxycoumarin (13). The structures of these compounds were identifi

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15

Hoffmann, Gerhard G. "Synthese und Eigenschaften von Brom(methyl)- und Iod(methyl)(organyIthio)gallanen / Synthesis and Properties of Bromo(methyl)- and Iodo(methyl)(organylthio)gallanes." Zeitschrift für Naturforschung B 40, no. 3 (1985): 335–42. http://dx.doi.org/10.1515/znb-1985-0304.

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The reaction between dibromo- or diiodo(methyl)gallane and the trimethylsilyl sulphides (CH3)3SiSR (R = CH3, C2H5, n-C3H7, i-C3H7. Ph, CH2Ph) have been investigated. Halo(methyl)- (organylthio)gallanes are formed. These compounds and their chloro analogues can also be obtained by the reactions between the dihalo(methyl)gallanes and the corresponding leaddi- (thiolates) in the molar ratios 2:1, or from the halo(dimethyl)gallanes and free thiols. Some physical and chemical properties of the new compounds are given, and the tentative mechanisms of these reactions are discussed. Syntheses of methy

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16

Haladová, Mária, Eva Eisenreichová, Anna Bučková, Jozef Tomko, and Dušan Uhrín. "New nitrogen-containing compounds in Lilium candidum L." Collection of Czechoslovak Chemical Communications 53, no. 1 (1988): 157–60. http://dx.doi.org/10.1135/cccc19880157.

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1-(3’-Methyl-2’-oxo-5’-pyrrolidinyl)-3-methyl-3-pyrrolin-2-one, 1-(2’-oxo-5’-pyrrolidinyl)-3-meth-yl-3-pyrrolin-2-one and 1-(3’-methyl-2’-oxo-5’-pyrrolidinyl)-5-hydroxy-3-methyl-3-pyrrolin-2-one were isolated from petals of Lilium candidum L.(Liliaceae). Presence of these substances, obtained by column chromatography of the extract on silica gel, has not been reported in any plant material as yet; their structures were adduced from spectral data.

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17

Mariaca, R. G., E. Fernandez-Garcia, A. F. Mohedano, and M. Nufiez. "Volatile Fraction of Ewe's Milk Semi-Hard Cheese Manufactured with and without the Addition of a Cysteine Proteinase." Food Science and Technology International 7, no. 2 (2001): 131–39. http://dx.doi.org/10.1177/108201320100700205.

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A dynamic headspace technique (purge and trap) coupled to gas chromatography-mass spectrometry was used for the study of the volatile fraction of pasteurized ewe's milk cheese. The effect of the addition of the cysteine proteinase of Micrococcus sp. INIA 528 to milk on the formation of volatile aroma compounds in cheese was also evaluated. Forty-five compounds, in total, were identified, including hydrocarbons, alcohols, ketones, aldehydes, esters, terpenes and sulfur compounds. The abundance of most volatile compounds increased significantly (P < 0.05) with ripening time, except those of e

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18

Igwe, O. U., and D. E. Udofia. "Secondary Metabolites of the Cuticular Abdominal Glands of Variegated Grasshopper (Zonocerus variegatus L.)." International Journal of Spectroscopy 2015 (September 7, 2015): 1–6. http://dx.doi.org/10.1155/2015/901386.

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Chemical compounds were extracted with petroleum ether from the cuticular abdominal glands of grasshopper (Zonocerus variegatus L.) and eleven compounds were characterised using Gas Chromatography/Mass Spectrometry (GC/MS) technique in combination with Fourier Transform-Infrared Spectroscopy (FT-IR). The compounds analysed were 2,7-dimethyloctane (3.21%), decane (5.33%), undecane (3.81%), tridecanoic acid methyl ester (4.76%), hexadecanoic acid (9.37%), 11-octadecenoic acid methyl ester (23.18%), pentadecanoic acid, 14-methyl-methyl ester (4.43%), (Z)-13-docosenoic acid (10.71%), dodecyl penta

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19

Márquez-Ruiz, Gloria, Francisca Holgado, María Victoria Ruiz-Méndez, and Joaquín Velasco. "Chemical Changes of Hydroperoxy-, Epoxy-, Keto- and Hydroxy-Model Lipids under Simulated Gastric Conditions." Foods 10, no. 9 (2021): 2035. http://dx.doi.org/10.3390/foods10092035.

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Chemical changes occurring in dietary lipid oxidation compounds throughout the gastrointestinal tract are practically unknown. The first site for potential chemical modifications is the stomach due to the strong acidic conditions. In this study, model lipids representative of the most abundant groups of dietary oxidation compounds were subjected to in vitro gastric conditions. Thus, methyl linoleate hydroperoxides were used as representative of the major oxidation compounds formed in food storage at low and moderate temperatures. Methyl 9,10-epoxystearate, 12-oxostearate and 12-hydroxystearate

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20

Laddi, U. V., and S. R. Desai. "SYNTHESIS AND ANTIMICROBIAL ACTIVITY OF SOME NEW 1,3,4- OXADIAZOLES, 1,2,4-TRIAZOLES AND 1,3,4-THIADIAZOLES." INDIAN DRUGS 53, no. 06 (2016): 18–23. http://dx.doi.org/10.53879/id.53.06.10489.

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Some new 5-[(((α-phenyl/methyl)benzylidene)amino)oxy]methyl/ethyl-2-[4-(substituted aryl)/allyl)] amino-1,3,4-oxadiazoles (4a-p), 3-[(((α-phenyl/methyl)- benzylidene) amino)oxy]methyl/ethyl-4-(4- substitutedaryl)/allyl-5-mercapto-1,2,4-triazoles (5a-p) and 5-[(((α-phenyl/methyl)-benzylidene)amino) oxy]- methyl/ethyl-2-[4-(substituted aryl)/allyl)]amino-1,3,4-thiadiazoles (6a-p) were prepared starting from α/β-[((α-(phenyl/methyl)benzylidene)amino)oxy acetic/propionic acid hydrazides (1a-d). The structures of all the compounds have been established by elemental and spectral (IR, 1HNMR and mass)

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21

Wanare, Rajendra K., Yogesh V. Punatkar, and Ravin M. Jugade. "SYNTHESIS, POLAROGRAPHIC AND ANTIMICROBIAL STUDIES OF BENZISOXAZOLYLN- GLUCOSIDES." Journal of Advanced Scientific Research 12, no. 04 Suppl 1 (2021): 281–87. http://dx.doi.org/10.55218/jasr.s1202112432.

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The desired compounds 7-amino-3-methyl-5-(3′-aryl prop-2′-enoyl)-1,2-benzisoxazoles 2a-j were prepared by the reaction of appropriate 5-acetyl-7-amino-3-methyl-1,2-benzisoxazole 1 with different aromatic aldehydes. The reaction of (2a-j) with hydroxylamine hydrochloride was done to form 7-amino-3-methyl-5-(3′-aryl isoxazol-5′-yl)-1,2- benzisoxazoles (3a-j). Condensation of tetra-O-acetyl-α-D-glucopyranosyl bromide (TAGBr) with 7-amino-3-methyl-5- (3′-aryl isoxazol-5′-yl)-1,2-benzisoxazoles furnishes 7-amino-(β-D-2,3,4,6-tetra-O-acetyl glucopyranosyl)-3-methyl-5- (3′-aryl isoxazol-5′-yl)-1,2-be

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22

SUSHMA, SAXENA, BHALLA M., VERMA M., K. SAXENA A., and SHANKER K. "New Quinazolone Congeners." Journal of Indian Chemical Society Vol. 68, Mar 1991 (1991): 142–43. https://doi.org/10.5281/zenodo.5955423.

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Department of Pharmacology and Therapeutics, Sing George's Medical College, Lucknow-226 003 <em>Manuscript received 5 October 1990, revised 11 February 1991,  accepted 7 March 1991</em> 6, 8- Substituted - 2- ( 2- phenyletheny1)-3.(1-methy1-2-phenylethyl)- 4 ( 3<em>H</em>)-quinazolinones(2a - d) and 6,8-substituted-2-bromomethy1-3-(1-methyl-2-phenylethyl)-4(3<em>H</em>)- quinazolinones (5a-d) were synthesised from 6,8-substituted-7.-meth)1-3-(1-methylh-phenylethyl)-4(3<em>H</em>)-quinazolinones (1). Compounds 2 were further brominated and treated with secondary amines to yie

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23

Do, Thanh-Hung, Thuc-Huy Duong, Huy Truong Nguyen, et al. "Biological Activities of Lichen-Derived Monoaromatic Compounds." Molecules 27, no. 9 (2022): 2871. http://dx.doi.org/10.3390/molecules27092871.

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Lichen-derived monoaromatic compounds are bioactive compounds, associated with various pharmacological properties: antioxidant, antifungal, antiviral, cytotoxicity, and enzyme inhibition. However, little is known about data regarding alpha-glucosidase inhibition and antimicrobial activity. Very few compounds were reported to have these activities. In this paper, a series of monoaromatic compounds from a lichen source were isolated and structurally elucidated. They are 3,5-dihydroxybenzoic acid (1), 3,5-dihydroxybenzoate methyl (2), 3,5-dihydroxy-4-methylbenzoic acid (3), 3,5-dihydroxy-4-methox

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24

Grebenteuch, Sandra, Clemens Kanzler, Stefan Klaußnitzer, Lothar W. Kroh, and Sascha Rohn. "The Formation of Methyl Ketones during Lipid Oxidation at Elevated Temperatures." Molecules 26, no. 4 (2021): 1104. http://dx.doi.org/10.3390/molecules26041104.

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Lipid oxidation and the resulting volatile organic compounds are the main reasons for a loss of food quality. In addition to typical compounds, such as alkanes, aldehydes and alcohols, methyl ketones like heptan-2-one, are repeatedly described as aroma-active substances in various foods. However, it is not yet clear from which precursors methyl ketones are formed and what influence amino compounds have on the formation mechanism. In this study, the formation of methyl ketones in selected food-relevant fats and oils, as well as in model systems with linoleic acid or pure secondary degradation p

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25

Huang, Zhi-hong, Zhi-li Wang, Bao-lin Shi, et al. "Simultaneous Determination of Salicylic Acid, Jasmonic Acid, Methyl Salicylate, and Methyl Jasmonate fromUlmus pumilaLeaves by GC-MS." International Journal of Analytical Chemistry 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/698630.

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Salicylic acid, jasmonic acid, methyl salicylate, and methyl jasmonate are important phytohormones and defensive signaling compounds, so it is of great importance to determine their levels rapidly and accurately. The study usesUlmus pumilaleaves infected byTetraneura akinire Sasakiat different stages as materials; after extraction with 80% methanol and ethyl acetate and purification with primary secondary amine (PSA) and graphitized carbon blacks (GCB), the contents of signal compounds salicylic acid, jasmonic acid, methyl salicylate, and methyl jasmonate were determined by GC-MS. The results

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26

Dawid, Malgorzata, Grzegorz Mloston, Darren L. Reid, and John Warkentin. "Reactions of dimethoxycarbene with thiocarbonyl compounds." Canadian Journal of Chemistry 81, no. 9 (2003): 1025–28. http://dx.doi.org/10.1139/v03-124.

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A diverse sample of thiocarbonyl compounds were examined to determine what the ultimate stable products are of their reactions with dimethoxycarbene. Those ultimate products can be significantly different for an oxyphosphinyl dithioformate, methyl dithiobenzoate, O-methyl thiobenzoate, and dimethyl xanthate. Key words: dimethoxycarbene, thiocarbonyl compounds, 2,5-dihydro-2,2-dimethoxy-5,5-dimethyl-1,3,4-oxadiazole.

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27

Winkelmann, Karin, Metin San, Zacharias Kypriotakis, Helen Skaltsa, Blazenka Bosilij, and Jörg Heilmann. "Antibacterial and Cytotoxic Activity of Prenylated Bicyclic Acylphloroglucinol Derivatives from Hypericum amblycalyx." Zeitschrift für Naturforschung C 58, no. 7-8 (2003): 527–32. http://dx.doi.org/10.1515/znc-2003-7-814.

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Abstract Two new bicyclic acylphloroglucinol derivatives, hypercalyxone A (1-[5,7-dihydroxy-2-methyl- 3-(3-methyl-but-2-enyl)-2-(4-methyl-pent-3-enyl)-chroman-8-yl]-2-methyl-propan-1-one, 1) and B (1-[5,7-dihydroxy-2-methyl-3-(3-methyl-but-2-enyl)-2-(4-methyl-pent-3-enyl)-chroman- 8-yl]-2-methyl-butan-1-one, 2), have been isolated from the petroleum ether extract of the aerial parts of Hypericum amblycalyx, together with two further compounds (1-[5,7- dihydroxy-2-methyl-2-(4-methyl-pent-3-enyl)-chroman-8-yl]-2-methyl-propan-1-one, 3 and 1-[5,7-dihydroxy-2-methyl-2-(4-methyl-pent-3-enyl)-chroma

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28

F. H. Ferdosi, Malik, Iqra Haider Khan, Arshad Javaid, Hafiz M. Saeed, Ifrayeem Butt, and Ayesha Munir. "GC-MS ANALYSIS PROFILE AND BIOACTIVE COMPONENTS OF FLOWERS OF Bergenia ciliata, A WEED OF ROCK CREVICES." JOURNAL OF WEED SCIENCE RESEARCH 27, no. 4 (2021): 527–35. http://dx.doi.org/10.28941/pjwsr.v27i4.1012.

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Bergenia ciliata is a weed of hilly areas of Pakistan that generally grows in rock crevices. In the present study, flowers of this weeds were collected from Murree. The dried flowers were extracted in methanol and subjected to GC-MS analysis that showed 7 compounds in it. The predominant compound was hexanedioic acid, bis(2-ethylhexyl) ester (48.88%) followed by γ-sitosterol (22.56%). Moderately occurring compound was cyclohexane, 1,3,5-triphenyl- (12.87%). The remaining compounds namely n-hexadecanoic acid (4.97%), pentadecanoic acid, 14-methyl-, methyl ester (3.77%), 9,12-octadecadienoic aci

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Janam Singh, Ram, and Dharmendra Kumar Singh. "Syntheses of Some 3,5-Diaryl-4H-1,2,4-triazole Derivatives and their Antifungal Activity." E-Journal of Chemistry 6, s1 (2009): S219—S224. http://dx.doi.org/10.1155/2009/925964.

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Syntheses of a series of 3, 5-diaryl-4H-1, 2, 4-triazole derivatives are described. In this present work, 4-amino-3-phenyl-5-p-tolyl-4H-1,2,4-triazole(1) was converted toN,N’-bis[3-phenyl-5-p-tolyl-4H-1,2,4-triazolyl]-1,4-xylenediimine(2) and 3-Phenyl-5-p-tolyl-4-[4-methyl benzylidenamino]-4H-1,2,4-triazole (3) in good yields by treatment with aldehydes OHC-C6H4-CHO and Ar-CHO respectively. The compoundsN,N’-bis[3-phenyl-5-p-tolyl-4H-1,2,4-triazolyl]-1,4-xylenediimine (2) and 3-phenyl-5-p-tolyl-4-[4-methyl benzylidenamino]-4H-1,2,4-triazole (3) were reduced with NaBH4to afford the correspondin

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30

Duke, Stephen O., and John Lydon. "Herbicides from Natural Compounds." Weed Technology 1, no. 2 (1987): 122–28. http://dx.doi.org/10.1017/s0890037x00029304.

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Phytotoxic compounds from plants and microorganisms represent a wide range of chemistries and mechanisms of action that have potential in the design and development of new herbicides. Although several natural products of higher plants have been patented as herbicides, none have been developed commercially. Many microbial products have been patented as herbicides and several have been or are being developed, including bialophos {L-2-amino-4-[(hydroxy)(methyl)phosphinoyl] -butyryl-L-alanyl-L-alanine} and glufosinate [L-2-amino-4-(hydroxyl)(methyl)(phosphinoyl)-butyric acid]. The new tools of mol

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Refsvik, Tor, and Tor Norseth. "Methyl Mercuric Compounds in Rat Bile." Acta Pharmacologica et Toxicologica 36, no. 1 (2009): 67–78. http://dx.doi.org/10.1111/j.1600-0773.1975.tb00772.x.

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Zachariou, Andrea, Alexander P. Hawkins, Paul Collier, Russell F. Howe, David Lennon, and Stewart F. Parker. "The Methyl Torsion in Unsaturated Compounds." ACS Omega 5, no. 6 (2020): 2755–65. http://dx.doi.org/10.1021/acsomega.9b03351.

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Koshchienko, Yu V., O. V. Ryabtsova, and B. A. Tertov. "1-Methyl-2-alkylbenzimidazole organomagnesium compounds." Chemistry of Heterocyclic Compounds 31, no. 2 (1995): 245. http://dx.doi.org/10.1007/bf01169692.

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Plotto, A., M. R. McDaniel, and J. P. Mattheis. "Development of a Flavor Profile of `Gala' Apples Using OSME Sensory Technique." HortScience 30, no. 4 (1995): 889E—889. http://dx.doi.org/10.21273/hortsci.30.4.889e.

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`Gala' is an early season apple variety that has a distinctive aroma and flavor. Studies were conducted to identify volatile compounds that contribute to `Gala' aroma. `Gala' apples were harvested at optimum maturity in a commercial orchard. Volatile compounds were trapped on activated charcoal using dynamic headspace sampling and eluted with carbon disulfide. Odor profiles of the samples were determined using OSME, a method developed at Oregon State Univ. that combines gas chromatography and olfactometry with a time-intensity scale. Three trained panelists described odor characteristics of co

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Plotto, A., M. R. McDaniel, and J. P. Mattheis. "Development of a Flavor Profile of `Gala' Apples Using OSME Sensory Technique." HortScience 30, no. 4 (1995): 889E—889. http://dx.doi.org/10.21273/hortsci.30.4.889.

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`Gala' is an early season apple variety that has a distinctive aroma and flavor. Studies were conducted to identify volatile compounds that contribute to `Gala' aroma. `Gala' apples were harvested at optimum maturity in a commercial orchard. Volatile compounds were trapped on activated charcoal using dynamic headspace sampling and eluted with carbon disulfide. Odor profiles of the samples were determined using OSME, a method developed at Oregon State Univ. that combines gas chromatography and olfactometry with a time-intensity scale. Three trained panelists described odor characteristics of co

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36

Ferdosi, Malik Fh, Arshad Javaid, and Iqra Haider Khan. "Phytochemical profile of n-hexane flower extract of Cassia fistula L." Bangladesh Journal of Botany 51, no. 2 (2022): 393–99. http://dx.doi.org/10.3329/bjb.v51i2.60438.

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Flowers of Cassia fistula L. were collected from Lahore, Pakistan and extracted in methanol followed by separation of n-hexane soluble compounds in a separating funnel. The separated n-hexane phase was analyzed by GC-MS for identification of various possible phytochemicals. Among the 31 identified compounds, the predominant compound in this fraction was butanoic acid, methyl ester with 17.81% peak area followed by 3-eicosene, (E)- (6.83%), 2-ethylformanilide (6.59%), naphthalene (6.10%), trifluoroacetoxy hexadecane (5.88%), 5-octadecene, (E)- (5.58%), phenylethanolamine (5.09%), 1-hexene- 3,5-

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37

Adebiyi, Adedeji Olayinka, and Patrick Olugbenga Tedela. "Phytochemical Profiling and GC-MS Analysis of Extracts of Two Tropical Moss Species." Scholars Academic Journal of Biosciences 11, no. 05 (2023): 181–90. http://dx.doi.org/10.36347/sajb.2023.v11i05.003.

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The crude extracts obtained from two tropical moss species namely: Philonotis hastata (Duby) Wijk & Margad and Barbula lambaranensis C. Mull were analysed with a view to identifying the bioactive compounds present in them. The mosses were collected from their natural population and air dried at ambient temperature in the laboratory for fourteen days. The aqueous extracts were subjected to phytochemical analysis using standard methods while the n- hexane extracts were subjected to gas chromatography-mass spectrometry (GC-MS) analysis. The results of the phytochemical screening showed the pr

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Azam, Mohammed Afzal, Loganathan Dharanya, Charu Chandrakant Mehta, and Sumit Sachdeva. "Synthesis and biological evaluation of some novel pyrazolopyrimidines incorporating a benzothiazole ring system." Acta Pharmaceutica 63, no. 1 (2013): 19–30. http://dx.doi.org/10.2478/acph-2013-0001.

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In the present study, a series of benzothiazol derivatives 3a-l containing pyrazolo[3,4-d]pyrimidine moiety at the second position were synthesized and characterized by analytical and spectral data. The compounds were tested for their in vitro antimicrobial activity. Compounds 1-(1,3-benzothiazol-2- yl)-3-methyl-4-phenyl-1H-pyrazolo[3,4-d]pyrimidine (3a), 1- (1,3-benzothiazol-2-yl)-4-(4-chlorophenyl)-3-methyl-1H-pyrazolo[ 3,4-d]pyrimidine (3d) and 1-(1,3-benzothiazol-2-yl)- 3-methyl-4-substituted phenyl-1H-pyrazolo[3,4-d]pyrimidines (3h-j) showed significant inhibitory activity against P. aeru

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Awe, Yemisi Tosin, Abimbola Yusuf Sangodoyin, and Mary Bosede Ogundiran. "Assessment of organophosphate pesticide residues in environmental media of Araromi farm settlement, Osun State, Nigeria." Environmental Analysis Health and Toxicology 37, no. 4 (2022): e2022031. http://dx.doi.org/10.5620/eaht.2022031.

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The aim of the study was to assess the occurrence and distribution of organophosphate compounds residue in soil, surface water, sediment, and banana crops in Araromi farm settlement, Osun State, Nigeria. Organophosphate pesticide residues were determined using a gas chromatography equipped with Flame-Ionization Detection (GC-FID) in 16 soil samples from cocoa and banana farms, 6 water and sediment samples each, and 8 banana samples from 4 farms in the study site. Fourteen organophosphate compounds were detected (acephate, omethoate, dementon-s-methyl, dimethoate, tolcofos-methyl, pirimiphos-me

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40

Awe, Yemisi Tosin, Abimbola Yisau Sangodoyin, and Mary Bosede Ogundiran. "Assessment of organophosphate pesticide residues in environmental media of Araromi farm settlement, Osun State, Nigeria." Environmental Analysis Health and Toxicology 37, no. 4 (2022): e2022035. http://dx.doi.org/10.5620/eaht.2022035.

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The aim of the study was to assess the occurrence and distribution of organophosphate compounds residue in soil, surface water, sediment, and banana crops in Araromi farm settlement, Osun State, Nigeria. Organophosphate pesticide residues were determined using a gas chromatography equipped with Flame-Ionization Detection (GC-FID) in 16 soil samples from cocoa and banana farms, 6 water and sediment samples each, and 8 banana samples from 4 farms in the study site. Fourteen organophosphate compounds were detected (acephate, omethoate, dementon-s-methyl, dimethoate, tolcofos-methyl, pirimiphos-me

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41

Maimulyanti, Askal, and Anton Restu Prihadi. "INTEGRATED EXTRACTION BY PERCOLATION, DISTILLATION, AND SOXHLET EXTRACTION TO SEPARATE BIOACTIVE AND BIOENERGY COMPOUNDS FROM SPENT COFFEE GROUND." RASAYAN Journal of Chemistry 15, no. 02 (2022): 1234–40. http://dx.doi.org/10.31788/rjc.2022.1526624.

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The spent coffee ground has potential compounds applied in food and bioenergy. In this study, an integrated extraction to separate chemical compounds from the spent coffee ground was designed. Furthermore, the extraction apparatus was combined for percolation, distillation, and Soxhlet extraction. The distillation technique produces flavored coffee, Soxhlet extraction separates coffee oil; while percolation produces the coffee extract. Analysis of coffee aroma using distillation techniques obtained alpha furfuryl alcohol (52.16%), methyl pyrazine (15.63%), and 2.6-dimethyl paradiazine (9.62%).

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El Euch, Imene Z., Mohammad M. El-Metwally, Marcel Frese, Norbert Sewald, Negera Abdissa, and Mohamed Shaaban. "Secondary metabolites from Penicillium sp. 8PKH isolated from deteriorated rice straws." Zeitschrift für Naturforschung C 74, no. 11-12 (2019): 283–88. http://dx.doi.org/10.1515/znc-2019-0010.

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Abstract In the search for bioactive secondary metabolites from terrestrial fungi, four compounds, namely, 3-methyl-3H-quinazolin-4-one (1), aurantiomide C (2), 3-O-methylviridicatin (3), and dehydrocyclopeptine (4), were isolated from Penicillium sp. 8PKH, fungal strain, isolated from deteriorated rice straws. The structures of the isolated compounds were identified by extensive NMR and mass analyses and comparison with literature data. This is the first report of the structure of 3-methyl-3H-quinazolin-4-one (1) with full NMR spectral data having been previously identified by GC-MS from Pipe

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Luo, Xiaowei, Xuefeng Zhou, and Yonghong Liu. "Nitrogenous Compounds Produced by the Deep Sea Derived Fungus Leptosphaeria sp. SCSIO 41005." Natural Product Communications 13, no. 6 (2018): 1934578X1801300. http://dx.doi.org/10.1177/1934578x1801300606.

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Four nitrogenous compounds, including two new compounds methyl-4-((1-hydroxy-3-methylpentan-2-yl)amino)–3-methyl-4-oxobutanoate (1), 4-((1-acetoxy-3-methylpentan-2-yl)amino)–3-methyl-4-oxobutanoic acid (2), and two amino acid derivatives (3, 4), were isolated from the deep sea derived fungus Leptosphaeria sp. SCSIO 41005, together with a cyclohexanone derivative (5) as new natural compound and other three known compounds (6–8). Their structures were elucidated by means of comprehensive 1D, 2D NMR and HR-ESI-MS spectroscopic methods. All the compounds were evaluated for their cytotoxic and anti

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Kasal, Alexander, and Jaroslav Zajíček. "Solvolysis of Westphalen-type compounds." Collection of Czechoslovak Chemical Communications 51, no. 7 (1986): 1462–75. http://dx.doi.org/10.1135/cccc19861462.

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Action of some nucleophilic reagents (CH3COOAg, CH3COOK, LiAlH4) on 6β-chloro- and 6β-methanesulfonyloxy-5-methyl-19-nor-5β-cholest-9-enes VIII - XII affords predominantly A-homo-B,19-dinor-5β-cholest-9-ene derivatives, arising by rearrangement and substitution (XIII, XXIV) or rearrangement and elimination (e.g. XX). Hydrogenolysis of compounds of the type VIII with lithium aluminium hydride gives, in addition, a product of rearrangement, fragmentation and further reduction (XXVI), and 5-methyl-6α,10-cyclo-19-nor-5β,9β,10α-cholestan-3β-ol (XXX).

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45

Abrakasa, S., and H. O. Nwankwoala. "The Presence of 2-Thiaadamantane in Niger Delta Oils may indicate Souring in Niger Delta Reservoirs." Pakistan Journal of Geology 3, no. 1 (2019): 22–27. http://dx.doi.org/10.2478/pjg-2019-0003.

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AbstractSome oil samples from various Nigerian oil fields were examined for the presence of Thermochemical Sulphate Reduction (TSR) derived organo sulphur compounds. Oil samples were diluted with DCM and injected into the GC–MS for full scan analysis. The GC–MS results show the presence 2–thiaadamantane, 1–methyl-2-thiaadamanatane and 5–methyl-2-thiaadamanatane, the compounds were identified by comparison of extracted spectras with literature. The presence of these compounds in oils has been accepted on a wider horizon as indicators of reservoir souring. The plot of 5–Methyl-2-thiaadamantane/A

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Wójtowski, Jacek Antoni, Małgorzata Majcher, Romualda Danków, et al. "Effect of Herbal Feed Additives on Goat Milk Volatile Flavor Compounds." Foods 12, no. 15 (2023): 2963. http://dx.doi.org/10.3390/foods12152963.

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The aim of this study is to investigate the effects of herbal supplements administered to goats on sensory quality and volatile flavor compounds in their milk. The experiment was conducted on sixty Polish white improved goats randomly allocated into five feeding groups (four experimental and one control) of twelve goats each. The trial lasted 12 weeks. The experimental animals received supplements containing a mixture of seven or nine different species of herbs at 20 or 40 g/animal/day. The control group received feed without any herbal supplements. Milk obtained from experimental and control

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Duong, Huy Thuc, Chi Bui Linh Huynh, Phong Xuan Ha, Quang That Ton, and Phung Kim Phi Nguyen. "SOME PHENOLIC COMPOUNDS OF LICHEN PARMOTREMA PLANATILOBATUM (HALE) HALE (PARMELIACEAE)." Science and Technology Development Journal 14, no. 4 (2011): 5–10. http://dx.doi.org/10.32508/stdj.v14i4.2041.

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Parmotrema planatilobatum (Hale) Hale is a lichen which has not been chemically and biologically studied. From the lichen collected in Viet Nam, seven compounds were isolated, including methyl β-orsellinate (1), methyl orsellinate (2), orsellinic acid (3), methyl haematommate (4), atranorin (5), lecanoric acid (6) and (+)-(12R)-usnic acid (7). The structures of these compounds were elucidated by spectroscopic data and compared with those in references. This is the fisrt time that these compounds are known in Parmotrema planatilobatum (Hale) Hale.

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Gianelli, M. P., A. Olivares, and M. Flores. "Key Aroma Components of a Dry-Cured Sausage with High Fat Content (Sobrassada)." Food Science and Technology International 17, no. 1 (2011): 63–71. http://dx.doi.org/10.1177/1082013210368557.

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The key aroma components and the lipolysis in a dry cured sausage ‘Sobrassada of Mallorca from black pig’ were studied. Sobrassada was characterized by a fatty acid profile with a high content of monounsaturated fatty acids and by the generation during the curing process of polyunsaturated free fatty acids that were oxidized to generate flavor compounds. Eighty-four different volatile compounds were identified and three of them were for the first time detected in dry sausages (methyl nonanoate, 1-methyl-1H-pyrrole and 2-acetyl pyrrole). Thirty-five different aroma active zones were found. The

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Henrrietta Ogadimma Asuzu-Samuel and John Godson Nnamdi. "Isolation and characterization of the bioactive components in Tetracarpidium conophorum as dissolvent in methanol." World Journal of Advanced Research and Reviews 20, no. 3 (2023): 1878–83. http://dx.doi.org/10.30574/wjarr.2023.20.3.2739.

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This study evaluate bioactive compounds present in the methanol extracts of raw Tetracarpidium conophorum (African walnut) with their molecular formulae, molecular weights, Retention Times (RT) and Peak areas (%), are shown in Table 1. The GC-MS chromatograms detected 13 peaks of bioactive compounds for extract as shown in Figure 2.The height of the peak indicates the relative concentration of the components present in the extracts. These compounds mainly comprised esters, alcohols, hydrocarbons and ketones. The major chemical constituents identified in the raw extract was 9,12,15-octadecatrie

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Malo, Edi A., Verónica Gutiérrez-Escobar, Federico Castrejón-Ayala, and Julio C. Rojas. "The Aggregation Pheromone of Metamasius spinolae (Coleoptera: Dryophthoridae) Revisited: Less is More." Environmental Entomology 49, no. 4 (2020): 803–9. http://dx.doi.org/10.1093/ee/nvaa054.

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Abstract The weevil Metamasius spinolae (Gyllenhal) is the most important insect pest of cultivated prickly pear in Mexico. A previous work reported that the pheromone of this weevil species was composed by three components. In this study, we reinvestigated the aggregation pheromone of M. spinolae using gas chromatography-electroantennography and gas chromatography–mass spectrometry to locate and identify new potential pheromonal compounds. The behavioral activity of identified compounds was evaluated in laboratory and field trials. Metamasius spinolae males released four compounds: 2-methyl-4

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