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Journal articles on the topic 'Isopropyl compounds'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Glamočlija, Una, Selma Špirtović-Halilović, Mirsada Salihović, et al. "Structure of Biologically Active Benzoxazoles: Crystallography and DFT Studies." Acta Chimica Slovenica 68, no. 1 (2021): 144–50. http://dx.doi.org/10.17344/acsi.2020.6237.

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Using X-ray single crystal diffraction, the crystal structures of biologically active benzoxazole derivatives were determined. DFT calculation was performed with standard 6-31G*(d), 6-31G** and 6-31+G* basis set to analyze the molecular geometry and compare with experimentally obtained X-ray crystal data of compounds. The calculated HOMO-LUMO energy gap in compound 2 (2-(2-hydroxynaphtalen-1-yl)-4-methyl-7-isopropyl-1,3-benzoxazol-5-ol) is 3.80 eV and this small gap value indicates that compound 2 is chemically more reactive compared to compounds 1 (4-methyl-2-phenyl-7-isopropyl-1,3-benzoxazol

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2

Tsuchiya, Y., M. F. Watanabe, and M. Watanabe. "Volatile Organic Sulfur Compounds Associated with Blue-Green Algae from Inland Waters of Japan." Water Science and Technology 25, no. 2 (1992): 123–30. http://dx.doi.org/10.2166/wst.1992.0043.

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Volatile organic sulfur compounds produced by Microcystis isolated from inland waters of Japan were identified. Compounds with an unpleasant smell have been detected from seven strains of Microcystis aeruginosa and three strains of M.wesenbergii. Isopropyl mercaptan was detected in all strains and isopropyl disulfide from five strains. Methyl isothiocyanate, isopropyl methyl sulfide, and isopropyl methyl disulfide were also found in some strains. Isopropyl mercaptan and isopropyl disulfide were decomposed by chlorination, with the formation of isopropyl sulfonyl chloride. A mutagenicity study

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3

JEON, JU-HYUN, SANG-GUEI LEE, and HOI-SEON LEE. "Isolation of Insecticidal Constituent from Ruta graveolens and Structure-Activity Relationship Studies against Stored-Food Pests (Coleoptera)." Journal of Food Protection 78, no. 8 (2015): 1536–40. http://dx.doi.org/10.4315/0362-028x.jfp-15-111.

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Isolates from essential oil extracted from the flowers and leaves of Ruta graveolens and commercial phenolic analogs were evaluated using fumigant and contact toxicity bioassays against adults of the stored-food pests Sitophilus zeamais, Sitophilus oryzae, and Lasioderma serricorne. The insecticidal activity of these compounds was then compared with that of the synthetic insecticide dichlorvos. To investigate the structure-activity relationships, the activity of 2-isopropyl-5-methylphenol and its analogs was examined against these stored-food pests. Based on the 50% lethal dose, the most toxic

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4

Jeffries, Benjamin, Zhong Wang, Robert I. Troup, et al. "Lipophilicity trends upon fluorination of isopropyl, cyclopropyl and 3-oxetanyl groups." Beilstein Journal of Organic Chemistry 16 (September 2, 2020): 2141–50. http://dx.doi.org/10.3762/bjoc.16.182.

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A systematic comparison of lipophilicity modulations upon fluorination of isopropyl, cyclopropyl and 3-oxetanyl substituents, at a single carbon atom, is provided using directly comparable, and easily accessible model compounds. In addition, comparison with relevant linear chain derivatives is provided, as well as lipophilicity changes occurring upon chain extension of acyclic precursors to give cyclopropyl containing compounds. For the compounds investigated, fluorination of the isopropyl substituent led to larger lipophilicity modulation compared to fluorination of the cyclopropyl substituen

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5

Barbosa-Cabrera, Elizabeth, Rosa Moo-Puc, Antonio Monge, Alma Delia Paz-González, Virgilio Bocanegra-García, and Gildardo Rivera. "In vitro and In Vivo Evaluation of Quinoxaline 1,4-di-N-oxide Against Giardia lamblia." Letters in Drug Design & Discovery 17, no. 4 (2020): 428–33. http://dx.doi.org/10.2174/1570180816666190618115854.

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Background: Giardiasis is an important public health problem. However, its pharmacological treatment is limited mainly to two drugs, metronidazole and nitazoxanide. Objectives: Screening four series of esters (methyl, ethyl, isopropyl and n-propyl) of quinoxaline-7- carboxylate 1,4-di-N-oxide in in vitro and in vivo models as antigiardiasis agents. Objectives: Screening four series of esters (methyl, ethyl, isopropyl and n-propyl) of quinoxaline-7- carboxylate 1,4-di-N-oxide in in vitro and in vivo models as antigiardiasis agents. Methods: Briefly, 4 × 104 trophozoites of G. lamblia were incub

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6

Lindsay, R. C., and T. P. Heil. "Flavor Tainting of Fish in the Upper Wisconsin River Caused by Alkyl- and Thiophenols." Water Science and Technology 25, no. 2 (1992): 35–40. http://dx.doi.org/10.2166/wst.1992.0032.

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Compounds responsible for pronounced off-flavors in Walleye pike (Stizostedion vitreum) and other sportfish in the Upper Wisconsin River were identified by gas chromatography-mass spectrometry and sensory techniques. Alkylphenols (2-isopropyl-, 3-isopropyl, 4-isopropyl-, 2,4-diisopropyl-, 2,5-diisopropyl-, 2,6-diisopropyl-, 3,5-diisopropyl-, 5-methyl-2-isopropyl-, and 2-methyl-5-isopropyl-) and thiophenol were found to be the principal contributors to flavor tainting in fish which was most pronounced in the spring. Data indicated that thiophenol entered the river sporadically through discharge

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7

Konieczny, Krzysztof, Arkadiusz Ciesielski, Julia Bąkowicz, Tomasz Galica, and Ilona Turowska-Tyrk. "Structural Transformations in Crystals Induced by Radiation and Pressure. Part 7. Molecular and Crystal Geometries as Factors Deciding about Photochemical Reactivity under Ambient and High Pressures." Crystals 8, no. 7 (2018): 299. http://dx.doi.org/10.3390/cryst8070299.

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We studied the photochemical reactivity of salts of 4-(2,4,6-triisopropylbenzoyl)benzoic acid with propane-1,2-diamine (1), methanamine (2), cyclohexanamine (3), and morpholine (4), for compounds (1), (3), and (4) at 0.1 MPa and for compounds (1) and (2) at 1.3 GPa and 1.0 GPa, respectively. The changes in the values of the unit cell parameters after UV irradiation and the values of the intramolecular geometrical parameters indicated the possibility of the occurrence of the Norrish–Yang reaction in the case of all the compounds. The analysis of the intramolecular geometry and free spaces revea

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8

Schiemenz, Günter Paulus, and Christian Näther. "peri-Interactions in Naphthalenes, 7 [1]. A Hetera-naphthalene as a Model Compound for 8-Dimethylaminonaphth- 1-yl Silicon and Phosphorus Compounds." Zeitschrift für Naturforschung B 57, no. 3 (2002): 309–18. http://dx.doi.org/10.1515/znb-2002-0309.

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AbstractIn a 4-isopropyl-1-oxa-3-oxonia-2-borata-naphthalene the isopropyl group exhibits the same conformational phenomena as the Me2N group in 8-dimethylamino-naphth-1-yl-silanes and related phosphorus compounds. Since the details can be fully rationalized on the basis of the steric situation and electronic factors are excluded, the common features cannot serve to infer dative interaction from nitrogen to silicon / phosphorus resulting in hypercoordination of the third period element atoms in the reference compounds.

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9

Hu, Yuan-bin, Jun-ying Sun, Tang-yun Yu, et al. "Proliferative Constituents from the Leaves of Micromelum integerrimum." Natural Product Communications 10, no. 10 (2015): 1934578X1501001. http://dx.doi.org/10.1177/1934578x1501001020.

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wo new compounds, 5- O-methyl-4-desmethyl-myricanol (1) and 6-formyl-5-isopropyl-3-hydroxymethyl-7-methyl-1H-indene (2), were isolated from the leaves of Micromelum integerrimum. Their structures were determined by spectroscopic methods. Additionally, compound 1 could stimulate the growth of NIH3T3 cells and promote cell migration. Compound 1 might exert its effects through increasing the protein expression of connective tissue growth factor.

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10

Oster, Ulrike, Martin Spraul, and Wolfhart Rüdiger. "Natural Inhibitors of Germination and Growth, V Possible Allelopathic Effects of Compounds from Thuja occidentalis." Zeitschrift für Naturforschung C 45, no. 7-8 (1990): 835–44. http://dx.doi.org/10.1515/znc-1990-7-815.

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Abstract Volatile compounds which are released from fresh leaves of Thuja occidentalis inhibited germination of seeds of Amaranthus caudatus and Lepidium sativum. The volatile compounds were obtained by a vacuum method applied to the leaves, by direct analysis of the content of secretory organs and by solvent extraction of leaves. The bioactive compounds proved to be monoterpenes. The highest bioactivity were found for alcoholic compounds followed by ketones, esters and finally hydrocarbons. Non-volatile germination inhibitors which were ex- tracted with hot water were abscisic acid (3-4 µg/g

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11

Zhou, Xiao-Feng, Guo-Tong Tong, Xiao-Wen Wang, and Yi He. "Anti-proliferative Constituents from Selaginella moellendorffii." Natural Product Communications 11, no. 5 (2016): 1934578X1601100. http://dx.doi.org/10.1177/1934578x1601100517.

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Two new compounds, (3 R)-5,6,7-trihydroxy-3-isopropyl-3-methylisochroman-1-one (1) and rhamnocitrin-3- O-β-glucopyranosyl-4′- O-β-galactosyl-(1→3)-glucopyranoside (2), were isolated from the whole plants of Selaginella moellendorffii Hieron. Their structures were determined by spectroscopic methods. Additionally, compound 1 could inhibit the proliferation of HT29 cells through inducing cell apoptosis.

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12

Nesterkina, Mariia, Dmytro Barbalat, Ivan Zheltvay, et al. "(2S,5R)-2-Isopropyl-5-methylcyclohexanone Hydrazones." Molbank 2019, no. 2 (2019): M1062. http://dx.doi.org/10.3390/m1062.

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Hydrazones were obtained in 76–78% yield via condensation of (2S,5R)-2-isopropyl-5-methylcyclohexanone with 4-R-phenoxyacetic acid hydrazides in the presence of a catalytic amount of glacial acetic acid. The structure of the target compounds has been established by FTIR-ATR, Raman, 1H-NMR and 13C-NMR spectral analysis and EI/FAB/ESI mass spectrometry. Thermal properties of hydrazones 3a–3e were elucidated by differential scanning calorimetry (DSC) and their purity by HPLC coupled to mass spectrometry. Synthesized compounds were found to exist as Z/E geometrical isomers about C=N bond and cis/t

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13

Glamočlija, Una, Subhash Padhye, Selma Špirtović-Halilović, et al. "Synthesis, Biological Evaluation and Docking Studies of Benzoxazoles Derived from Thymoquinone." Molecules 23, no. 12 (2018): 3297. http://dx.doi.org/10.3390/molecules23123297.

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Thymoquinone (TQ), a natural compound with antimicrobial and antitumor activity, was used as the starting molecule for the preparation of 3-aminothymoquinone (ATQ) from which ten novel benzoxazole derivatives were prepared and characterized by elemental analysis, IR spectroscopy, mass spectrometry and NMR (1H, 13C) spectroscopy in solution. The crystal structure of 4-methyl-2-phenyl-7-isopropyl-1,3-benzoxazole-5-ol (1a) has been determined by X-ray diffraction. All compounds were tested for their antibacterial, antifungal and antitumor activities. TQ and ATQ showed better antibacterial activit

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14

Baker, Robert W., Zinka Brkic, Melvyn V. Sargent, Brian W. Skelton, and Allan H. White. "Atropisomerism of 2,2'-Binaphthalenes." Australian Journal of Chemistry 53, no. 12 (2000): 925. http://dx.doi.org/10.1071/ch00122.

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The synthesis of diastereo-enriched substituted (4S)-4-isopropyl-2-(2,2′-binaphthalen-1-yl)-4,5-dihydrooxazoles from substituted 2-naphthalenylmagnesium bromides and (4S)-4-isopropyl-2-(2-methoxynaphthalen-1-yl)-4,5-dihydrooxazole (4) and (4S)-4-isopropyl-2-(2,3-dimethoxynaphthalen-1-yl)-4,5-dihydrooxazole (5) is described. The product oxazolines were converted into a number of derivatives and the free energy barriers to internal rotation of several of these derivatives were determined. The determination of the X-ray crystal structures and the c.d. spectra of (S,1S)-N-[2-hydroxy-1-(isopropyl)e

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15

Du, Zhao, Bin Guo, Aertuke Aisha, and Ai Ling Ren. "Pollution Characterisytics of Stench from Wastewater Treatment System on Penicillin Production." Advanced Materials Research 726-731 (August 2013): 902–6. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.902.

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With portable gas chromatography - mass spectrometry (GC - MS) each unit tested penicillin wastewater treatment system of volatile organic compounds (VOCs) from gas collection pipe. The results show that there are 29 pollutants in gas, including sulfur-containing compounds (90.37%). Large volume concentration H2S (383 ppm), isopropyl mercaptan (30,432 ppb) and acetone (16,024 ppb); H2S (766,000 times), isopropyl mercaptan (40576 times), methyl mercaptan (150 times) beyond their olfactory threshold; H2S (383 times) beyond the TWA threshold. Each unit stench in the sum of the pollutant concentra

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16

Kersting, Berthold. "Self-Assembly of Organo-Sulfur, Selenium and Tellurium Compounds via π-π-Stacking and Hydrogen Bonding Interactions". Zeitschrift für Naturforschung B 57, № 10 (2002): 1115–19. http://dx.doi.org/10.1515/znb-2002-1006.

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AbstractThe crystal structures of 2-isopropyl-benzisothiazol-3-one-7-carboxylicacid isopropyl amide and of the corresponding selenium and tellurium derivatives have been determined. In contrast to the sulfur and selenium compounds, the tellurium derivative has an unprecedented three-dimensional network structure held together via π-π stacking and hydrogen bonding interactions. The cavities in the 3D molecular network are filled with guestwater molecules that are hydrogen bonded to carbonyl oxygen atoms.

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17

Terraza, Gerbino, and Podestá. "Synthesis and Some Physical Properties of New Organometallic Compounds Containing Si and Sn Atoms." Proceedings 9, no. 1 (2018): 62. http://dx.doi.org/10.3390/ecsoc-22-05687.

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: This paper reports the synthesis of two new organotin hydrides containing a (phenyldimethylsilyl)methyl ligand. It was found that the reaction of (phenyldime thylsilyl) methylmagnesium bromide in ether afforded ((phenyldimethylsilyl)methyl) trimethyltin (3) (72%), and with (−)-menthyldimethyltin bromide (4) gave (((phenyl dimethylsilyl)methyl)(1R,2R,5R) -2-isopropyl-5-methylcyclohexyl)dimethyltin (5) (84%). Bromo dealkylation of 3 with bromine in MeOH led to ((phenyldimethylsilyl)methyl)dimethyltin bromide (6) (82%), which upon reduction with LiAlH4 yielded ((phenyldimethyl silyl)methyl)dime

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18

Kersting, Berthold. "Nickel Complexes of N-Alkylated Derivatives of 2,6-Bis(aminomethyl)- 4-tert-butyl-thiophenol." Zeitschrift für Naturforschung B 53, no. 11 (1998): 1379–85. http://dx.doi.org/10.1515/znb-1998-1124.

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The syntheses of N-alkylated derivatives of the arenethiol 4-tert-butyl-2,6-(diaminomethyl)- thiophenol and their coordination properties are reported. Compounds 4-tert-butyl-2,6-di(N-isopropyl- aminomethyl)thiophenol (3) and 4-tert-butyl-2-(N-isopropyl-aminomethyl)-6-hydroxymethylthiophenol (6 ) react with Ni(II) salts to give compounds of composition [Ni(3)2]·2HCl (7) and [Ni(6)2] (8). The solid- and solution-state structures of both complexes consist of mononuclear complexes with four-coordinate nickel(II) ions in approximately planar trans- N2S2 coordination environments. In contrast to th

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19

Carrington, C. D., and M. B. Abou-Donia. "Characterization of [3H]di-isopropyl phosphorofluoridate-binding proteins in hen brain. Rates of phosphorylation and sensitivity to neurotoxic and non-neurotoxic organophosphorus compounds." Biochemical Journal 228, no. 3 (1985): 537–44. http://dx.doi.org/10.1042/bj2280537.

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The experiments described in this paper were designed to isolate [3H]di-isopropyl phosphorofluoridate-binding proteins by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis for the purpose of characterizing and identifying potential initiation sites for organophosphorus-compound-induced delayed neurotoxicity. The major Paraoxon-insensitive Mipafox-sensitive binding protein (Mr 160 000) was found to be identical with one previously identified as neurotoxic esterase, an enzyme that has been proposed to be the target site for organophosphorus-compound-induced delayed neurotoxicity. Howeve

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20

Tanaka, Koichi, Tomoyuki Horino, and Motoo Shiro. "Synthesis and Inclusion Properties of Novel Host Compounds Derived from Abietic Acid." Journal of Chemical Research 2002, no. 1 (2002): 17–19. http://dx.doi.org/10.3184/030823402103170321.

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The novel host compounds, (7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,4b,5,6,10,10a-decahydro-phenanthren-1-yl)-diphenyl-methanol (2a) and its p-chlorophenyl- (2b) and p-methoxyphenyl- (2c) derivatives, have been synthesised by the Grignard reaction of abietic acid ethyl ester with the corresponding ArMgBr. The host compounds (2a-2c) include various organic compounds by hydrogen bonding between the host and guest compounds.

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21

Palos, Isidro, Rosa Moo-Puc, José Luis Vique-Sánchez, et al. "Esters of quinoxaline-7-carboxylate-1,4-di-N-oxide as Trichomonas vaginalis triosephosphate isomerase inhibitors." Acta Pharmaceutica 71, no. 3 (2020): 485–95. http://dx.doi.org/10.2478/acph-2021-0032.

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Abstract Trichomoniasis is a public health problem worldwide. Trichomoniasis treatment consists of the use of nitroimidazole derivatives; however, therapeutic ineffectiveness occurs in 5 to 20 % of the cases. Therefore, it is essential to propose new pharmacological agents against this disease. In this work, esters of quinoxaline-7-carboxylate-1,4-di-N-oxide (EQX-NO) were evaluated in in vitro assays as novel trichomonicidal agents. Additionally, an in vitro enzyme assay and molecular docking analysis against triosephosphate isomerase of Trichomonas vaginalis to confirm their mechanism of acti

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22

Xu, Xin-Ya, Xiao-Yong Zhang, Fei He, Jiang Peng, Xu-Hua Nong, and Shu-Hua Qi. "Two New Compounds from Gorgonian-associated Fungus Aspergillus sp." Natural Product Communications 8, no. 8 (2013): 1934578X1300800. http://dx.doi.org/10.1177/1934578x1300800808.

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One new γ-lactone derivative 5-hydroxy-3-isopropyl-4-methoxyfuranone (1) and one new lactam derivative dehydrated-marinamide (2), along with two known compounds marinamide (3) and marinamide methyl ester (4) were isolated from the fermentation broth of the marine gorgonian-associated fungus Aspergillus sp. SCSGAF0093. Their structures were elucidated on the basis of spectroscopic and spectrometric analysis. Compound 1 showed significant toxicity to brine shrimp (Artemia salina) with a median lethal concentration (LC50) of 1.25 μM, and 3 inhibited protein tyrosine phosphatase 1B (PTPlB) with a

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23

Lira, Andressa Brito, Camila de Albuquerque Montenegro, Kardilandia Mendes de Oliveira, et al. "Isopropyl Caffeate: A Caffeic Acid Derivative—Antioxidant Potential and Toxicity." Oxidative Medicine and Cellular Longevity 2018 (2018): 1–14. http://dx.doi.org/10.1155/2018/6179427.

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Phenolic compounds, among them isopropyl caffeate, possess antioxidant potential, but not without toxicity and/or adverse effects. The present study aimed to evaluate the antioxidant activity and toxicity of isopropyl caffeate through in silico, in vitro and in vivo testing. The results showed that isopropyl caffeate presents no significant theoretical risk of toxicity, with likely moderate bioactivity: GPCR binding, ion channel modulation, nuclear receptor binding, and enzyme inhibition. Isopropyl caffeate induced hemolysis only at the concentrations of 500 and 1000 μg/ml. We observed types A

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24

Milosavljevic, Milutin, Aleksandar Marinkovic, Jelena Markovic, Danijela Brkovic, and Milan Milosavljevic. "Synthesis of tetraalkyl thiuram disulfides using different oxidants in recycling solvent mixture." Chemical Industry and Chemical Engineering Quarterly 18, no. 1 (2012): 73–81. http://dx.doi.org/10.2298/ciceq110726048m.

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A new optimized laboratory synthesis of tetraalkyl thiuram disulfides, starting from dialkyl amines and carbon disulfide in presence of three oxidants (hydrogen peroxide, potassium peroxodisulfate and sodium hypochlorite) and appropriate reaction medium: two mixtures of isopropyl alcohol - water used in two consecutive syntheses, was presented in this work. First synthesis was performed in a recycled azeotropic mixture of isopropyl alcohol - water 87.7% - 12.3%, and second in a filtrate obtained after first synthesis, which was a mixture of isopropyl alcohol - water 70.4% - 29.6%. After the se

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25

Wei, Min, Fu Yang, Xuyan Song, et al. "Extraction of Nitrogen Compounds from Tobacco Waste via Thermal Treatment." Energies 13, no. 18 (2020): 4619. http://dx.doi.org/10.3390/en13184619.

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Alkaloids, typical nitrogen compounds, were found to be abundant in tobacco waste. The recovery of alkaloids from tobacco waste for biological pesticides could reduce the use of traditional chemical pesticides and avoid the pollution of farmland by the leaching of alkaloids from tobacco waste. Considering the fact that alkaloids can easily volatilize, thermal treatment is expected to be a potential technology to achieve the release and recovery of alkaloids from tobacco waste. For better understanding of conversion behavior of nitrogen-containing compounds in tobacco waste during thermal treat

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26

Yang, Zhi, Wen-Jia Dan, Yi-Xiao Li, Guang-Rui Peng, An-Ling Zhang, and Jin-Ming Gao. "Antifungal Metabolites From Alternaria atrans: An Endophytic Fungus in Psidium guajava." Natural Product Communications 14, no. 5 (2019): 1934578X1984411. http://dx.doi.org/10.1177/1934578x19844116.

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Six metabolites (1–6), including 1 new fusaric acid derivative, designated atransfusarin (1), and 5 known compounds, (3 R,6 R)-3-benzyl-6-isopropyl-4-methylmorpholine-2,5-dione (2), daucoterol (3), adenosine (4), cerebroside B (5), and 2,3-dihydroxypropyl ( Z,Z)-9,12-octadecadienate (6), were isolated from the solid culture of an endophytic Alternaria atrans MP-7, associated with the medicinal plant Psidium guajava. The structure of the new compound was elucidated by spectral data. The antifungal test indicated that (3 R,6 R)-3-benzyl-6-isopropyl-4-methylmorpholine-2,5-dione (2) showed obvious

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27

Oguadinma, Paul O., та Frank Schaper. "Synthesis and structures of isopropyl-β-diketiminato copper(I) complexes". Canadian Journal of Chemistry 88, № 5 (2010): 472–77. http://dx.doi.org/10.1139/v10-013.

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The reaction of N,N′-diisopropyl-2-amino-4-iminopent-2-ene (nacnaci-PrH, 1) either with CuOt-Bu or with a mixture of mesityl copper and 10% CuOt-Bu afforded, in the presence of PPh3, CN(C6Me2H3), or MeCN, the Lewis base coordinated complexes nacnaci-PrCuPPh3·0.5 C6H14 (2), nacnaci-PrCuCN(C6Me2H3) (3), and nacnaci-PrCu(NCMe) (4). Compounds 2, 3, and 4 were characterized by single-crystal X-ray diffraction studies. Compound 4 afforded two species in deuterated benzene in a 2:1 ratio, which were assigned to {nacnaci-PrCu}2(μ-NCMe) and nacnaci-PrCuNCMe (4). Upon addition of 5 equiv. of MeCN, the t

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28

Muharni, Muharni, Fitrya Fitrya, Milanti Okta Ruliza, Dwi Anjar Susanti, and Elfita Elfita. "Di-(2-ethylhexyl)phthalate and Pyranon Derivated from Endophytic fungi Penicillium sp the Leave of Kunyit Putih (Curcuma zedoaria)." Indonesian Journal of Chemistry 14, no. 3 (2014): 290–96. http://dx.doi.org/10.22146/ijc.21241.

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Two compounds from cultivation of the endophytic fungi Penicillium sp of leaves of kunyit putih (Curcuma zedoaria have been isolated. The endophytic fungus was cultivated on 5 L of Potatos Dextrose Broth (PDB) medium at room temperature (no shaking) for 3 weeks. The cultures were extracted with ethyl acetate to afford 3.0 g of residue after removal of the solvent under reduced pressure. The extract was separated and purified by silica gel column chromatography (CC) and afforded two pure compounds as colorless oily liquid (compound 1) and yellow crystal (compound 2). The structure of these comp

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29

Drahoňovský, Dušan, Petr Štěpnička, and Dalimil Dvořák. "P-Chiral 2-{1'-[Butyl(phenyl)phosphanyl]ferrocen-1-yl}-4-isopropyl-4,5-dihydrooxazoles: A Second Chirality Center in Catalytic System." Collection of Czechoslovak Chemical Communications 70, no. 3 (2005): 361–69. http://dx.doi.org/10.1135/cccc20050361.

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P-Chiral (S,RP)-2-{1'-[butyl(phenyl)phosphanyl]ferrocen-1-yl}-4-isopropyl-4,5-dihydrooxazole (6) and (S,SP)-2-{1'-[butyl(phenyl)phosphanyl]ferrocen-1-yl}-4-isopropyl-4,5-dihydrooxazole (7) were prepared by the procedure developed by Jugé, starting from enantiomerically pure (-)- or (+)-ephedrine and dichloro(phenyl)phosphine. Compounds 6 and 7 were examined for asymmetric induction in the Pd-catalyzed reaction of rac-1,3-diphenylallyl acetate with dimethyl malonate. The best results were obtained with 7 (98% ee), while 6 gave 82% ee.

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30

Protiva, Miroslav, Jiří Jílek, Miroslav Rajšner, et al. "Fluorinated tricyclic neuroleptics with prolonged action: derivatives and analogues of 2-(4-(7-fluoro-2-isopropyl-10,11-dihydrodibenzo[b,f]thiepin-11-yl)-piperazine-1-yl)ethanol." Collection of Czechoslovak Chemical Communications 52, no. 7 (1987): 1811–33. http://dx.doi.org/10.1135/cccc19871811.

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The preparation of 4-fluoro-2-nitrobenzonitrile (V), an intermediate in the synthesis of the title compound I, from 4-fluoro-2-nitroaniline via 5-fluoro-2-iodonitrobenzene (VII) was elaborated. Syntheses of 1,1,1,3,3,3-hexadeutero-2-propyl (XX) and 1,3,4-trideutero (XXVIII) analogues of compound I from hexadeuteroacetone, and pentadeuterobromobenzene, respectively, were carried out. Compound I was esterified with acetic anhydride, decanoic acid and 3,4,5-trimethoxybenzoyl chloride to give the esters II-IV. Acylation of compound XXX with acetyl chloride, 4-fluorophenoxyacetyl chloride and (4-fl

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31

Gaston, Lewis A., Martin A. Locke, Steven C. Wagner, Robert M. Zablotowicz, and Krishna N. Reddy. "Sorption of Bentazon and Degradation Products in Two Mississippi Soils." Weed Science 44, no. 3 (1996): 678–82. http://dx.doi.org/10.1017/s0043174500094522.

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Bentazon degradation in soil typically proceeds with development of bound residue. Low sorption of bentazon suggests that this residue consists of degradation products; however, there is little data on the sorption behavior of these products. This study was undertaken to determine the sorption of bentazon and the degradation products 2-amino-N-isopropyl benzamide, 2-aminobenzoic acid, andN-methyl bentazon in Dundee silt loam and Sharkey clay, two common agricultural soils of the Mississippi Delta. Greater sorption of bentazon and degradation products in the Sharkey soil was related to finer te

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32

Butora, Gabriel, Ludvík Bláha, Miroslav Rajšner, and Ivan Helfert. "Some New Analogues of Verapamil and Mepamil. Synthesis and Basic Pharmacological Properties." Collection of Czechoslovak Chemical Communications 57, no. 9 (1992): 1967–81. http://dx.doi.org/10.1135/cccc19921967.

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Some new analogues of verapamil (Ia) and mepamil (Ib), calcium antagonists of arylalkylamine type, were synthesized and screened for cardiovascular activities. The basic structure was modified a) on the phenyl ring, attached to the quaternary carbon, b) on the alkyl group, attached to the quaternary carbon and c) on the alkylamino group, attached in position 3 to the n-propyl fragment. Except of 2-(2-chlorophenyl)-2-isopropyl-5-(N-methylhomoveratrylamino)valeronitrile (VIa), all the synthesized compounds exhibited lower hypotensive activity, than the mother compound, verapamil.

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33

Schenk, Wolfdieter A., and Ute Karl. "Notizen: Chirale Ruthenium-Halbsandwichkomplexe des Schwefelmonoxids und Schwefeldioxids [1] / Chiral Ruthenium Halfsandwich Complexes of Sulfur Monoxide and Sulfur Dioxide [1]." Zeitschrift für Naturforschung B 44, no. 8 (1989): 988–89. http://dx.doi.org/10.1515/znb-1989-0821.

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Chiral halfsandwich complexes of sulfur monoxide and sulfur dioxide, [C5Me5RuCl(PR3)(SOx)] (R = isopropyl, cyclohexyl, x = 1, 2), were prepared from the coordinatively unsaturated precursors [C5Me5RuCl(PR3)]. The new compounds were characterized by 1H 13C, 31P and IR spectroscopy.

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34

Raja, R., M. Suresh, R. Raghunathan, and A. SubbiahPandi. "Crystal structures of methyl 3-(4-isopropylphenyl)-1-methyl-1,2,3,3a,4,9b-hexahydrothiochromeno[4,3-b]pyrrole-3a-carboxylate, methyl 1-methyl-3-(o-tolyl)-1,2,3,3a,4,9b-hexahydrothiochromeno[4,3-b]pyrrole-3a-carboxylate and methyl 1-methyl-3-(o-tolyl)-3,3a,4,9b-tetrahydro-1H-thiochromeno[4,3-c]isoxazole-3a-carboxylate." Acta Crystallographica Section E Crystallographic Communications 71, no. 6 (2015): 574–77. http://dx.doi.org/10.1107/s2056989015008063.

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In the title compounds, C23H27NO2S, (I), and C21H23NO2S, (II), the pyrrole rings have envelope conformations with the C atom substituted by the benzene ring as the flap. In the third title compound, C20H21NO3S, (III), the isoxazole ring has a twisted conformation on the C—C bond substituted by the benzene ring and the carboxylate group. In all three compounds, the thiopyran ring has a half-chair conformation. The mean plane of the pyrrole ring is inclined to the mean plane of the thiopyran ring by 57.07 (9), 58.98 (9) and 60.34 (12)° in (I), (II) and (III), respectively. The benzene rings are

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35

Gutierrez, Pilar, Joaquín Altarejos, Pablo J. Linares-Palomino, Rachid Chahboun, and Enrique Alvarez-Manzaneda. "Synthesis of cassane-type diterpenes from abietane compounds: the first synthesis of taepeenin F." Organic Chemistry Frontiers 5, no. 17 (2018): 2537–41. http://dx.doi.org/10.1039/c8qo00603b.

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The first synthesis of taepeenin F from abietic acid is reported, utilizing as the key step the ipso-substitution of the isopropyl group of a dehydroabietane derivative by a formyl group, after treatment with Cl<sub>2</sub>CHOMe and AlCl<sub>3</sub>.

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36

Shim, Jae Ho, Si Hun Nam, Byeong-Seon Kim та Deok-Chan Ha. "Organocatalytic Asymmetric Michael Addition of Ketones to α, β-Unsaturated Nitro Compounds". Catalysts 10, № 6 (2020): 618. http://dx.doi.org/10.3390/catal10060618.

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An organic catalyst “(R, R)-1,2-diphenylethylenediamine(DPEN) derivative’’ was devel-oped as a chiral bifunctional organocatalyst and applied for asymmetric Michael additions of aromatic ketones to trans-β-nitroalkene compounds under neutral conditions. The isopropyl-subs-tituted thiourea catalyst in neutral condition provides high chemical yield and enantioselectivities (ee) (up to 96% yield, 98% ee).

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37

Swenson, Brian R., Traci L. Hedrick, Rosemarie Metzger, Hugo Bonatti, Timothy L. Pruett, and Robert G. Sawyer. "Effects of Preoperative Skin Preparation on Postoperative Wound Infection Rates A Prospective Study of 3 Skin Preparation Protocols." Infection Control & Hospital Epidemiology 30, no. 10 (2009): 964–71. http://dx.doi.org/10.1086/605926.

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Objective.To compare the effects of different skin preparation solutions on surgical-site infection rates.Design.Three skin preparations were compared by means of a sequential implementation Design. Each agent was adopted as the preferred modality for a 6-month period for all general surgery cases. Period 1 used a povidone-iodine scrub-paint combination (Betadine) with an isopropyl alcohol application between these steps, period 2 used 2% Chlorhexidine and 70% isopropyl alcohol (ChloraPrep), and period 3 used iodine povacrylex in isopropyl alcohol (DuraPrep). Surgical-site infections were trac

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38

Demchenko, S. A., A. E. Dudnik, T. A. Bukhtiarova, L. S. Bobkova та A. M. Demchenko. "Synthesis and anticancer properties of 1-(2-isopropyl-5-methylphenoxymethyl)-3R-4-aryl-5,6,7,8-tetrahydro-2,2а,8а-triazacyclopenta[cd]azulene derivatives". Farmatsevtychnyi zhurnal, № 1-2 (14 серпня 2018): 51–60. http://dx.doi.org/10.32352/0367-3057.1-2.18.06.

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In recent years, attention to itself is attracted to the problem of treatment of cancer that is caused by increase in patients, especially of working age. Therefore, the enlargement of the arsenal of anticancer medicines of a wide spectrum of action is actual. The purpose of the study was to synthesize substances with potentially antitumor properties in a series 1-(2-isopropyl-5-methylphenoxymethyl)-3R-4-aryl-5,6,7,8-tetrahydro-2,2а,8а-triazacyclopenta[cd]azulene derivatives and to study the effect of synthesized compounds on inhibition of growth (or their destruction) of a wide range of

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39

Danish, Isravel A., and Karnam J. R. Prasad. "Synthesis of 5-Methyl-1,2,3,4,5,6-hexahydrocyclopenta[g]carbazole-1,7- diones and Crotonyl-2-isopropyl-1-oxo-1,2,3,4-tetrahydrocarbazoles from 1-Oxo-1,2,3,4-tetrahydrocarbazoles by Friedel-Crafts Reaction." Zeitschrift für Naturforschung B 59, no. 6 (2004): 711–15. http://dx.doi.org/10.1515/znb-2004-0613.

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The reaction of 1-oxo-1,2,3,4-tetrahydrocarbazoles (1) with crotonic acid in polyphosporic acid afforded hitherto unknown 5-methyl-1,2,3,4,5,6-hexahydrocyclopenta[g]carbazole-1,7-diones (2) and 6-crotonyl-2-isopropyl-1-oxo-1,2,3,4-tetrahydrocarbazoles (3) in a single step. A plausible mechanism for the formation of the title compounds has been proposed, and all new compounds were characterized by IR, NMR, mass spectral methods and elemental analysis.

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40

Зенкевич (Zenkevich), Игорь (Igor') Георгиевич (Georgievich), and Татьяна (Tat'yana) Ивановна (Ivanovna) Пушкарева (Pushkareva). "ON THE MODELING THE FORMATION OF FLAVONOID OXIDATION DIMERIC PRODUCTS." chemistry of plant raw material, no. 3 (March 12, 2018): 185–97. http://dx.doi.org/10.14258/jcprm.2018033589.

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Dimeric products of the oxidation of flavonoids (including most abundant of them – quercetin) are observed rather often even in the dilute aqueous solutions. For explaining the formation of such products the free-radical and electrochemical oxidation of simpler substrate – 4-isopropyl phenol – is considered. It is shown that the products of these processes correspond with the formation of quinone methide intermediate. The formation of similar intermediates seems to be possible at the oxidation of natural flavonoids. The principal chemical property of quinone methides is conjugated addition of

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41

Arulkumaran, R., R. Sundararajan, V. Manikandan, V. Sathiyendiran, S. Pazhamalai, and Ganesamoorthy Thirunarayanan. "IR and ¹H NMR Spectral Studies of some 2-Amino-4-Isopropyl-6-Methoxy-N-Phenylpyrimidine-5-Carboxamides: Assessment of Substituent Effects." International Letters of Chemistry, Physics and Astronomy 38 (September 2014): 15–25. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.38.15.

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A series of 2-Amino-4-isopropyl-6-methoxy-N-phenylpyrimidine-5-carboxamide compounds have been synthesized from various substituted dithioacetal and guanidine. The purities of these compounds were checked by their physical constants, UV, IR, NMR and MASS spectral data. The IR and 1HNMR spectral data of these compounds have been correlated with Hammett sigma constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effects of substituents on the spectral group frequencies have been discussed.

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42

Engelhardt, LM, PC Healy, BW Skelton, and AH White. "Lewis-Base Adducts of Group 11 Metal(I) Compounds. XXXVII. A Novel Isomerism in the Heterobimetallic 1:1 Adducts of Copper(I) Halides With Tris(dithiocarbamato)cobalt(III)." Australian Journal of Chemistry 41, no. 6 (1988): 839. http://dx.doi.org/10.1071/ch9880839.

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Reaction of copper(I) iodide with tris (N,N- dipropyl -and N, N- diisopropyl-dithiocarbamato )cobalt(III), [Co(S2CNR2)3 ≡ Co( dtc )3](R = Pr or Pri ), yields 1:1 adducts which have been characterized by single-crystal X-ray structure determination. Crystals of the propyl species are monoclinic, P21/c, a 13.722(7), b 16.854(7), c 16.787(8)Ǻ, β 121.66(3)°, R was 0.056 for No 2834 'observed' reflections. The isopropyl derivative is orthorhombic, Ccca , a 33.93 (1), b 13.616(8), c 14.574(5)Ǻ; R was 0.075 for No 726. Each adduct is dimeric [Co( dtc )3](CuI2Cu)[Co( dtc )3]; the propyl derivative has

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43

Milisavljevic, Smiljka, Aleksandar Marinkovic, and Milutin Milosavljevic. "New method for synthesis of N-alkyl and N,N-dialkyl-O-ethyl and O-isopropylthiocarbamates by oxidation of ammonium salt of xhantogenic acid." Chemical Industry 64, no. 5 (2010): 401–9. http://dx.doi.org/10.2298/hemind100527049m.

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A synthesis of N-alkyl and N,N-dialkyl-O-ethyl and O-isopropyl thiocarbamates by oxidation of ammonium salt of ethyl and isopropylxanthogenic acid in a presence of sodium hypochlorite and hydrogen peroxide were performed. Ammonium salt of ethyl and isopropylxanthogenic acid was obtained by the reaction of alkylammonium sulfate and sodium ethyl and isopropyl xanthate. Studies on a dependence of N-ethyl-O-isopropylthiocarbamate yield and purity with respect to reaction parameters (reaction time, molar ratio of oxidant and ethylamonium salt of isopropylxanthogenic acid) were performed. Optimal re

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44

Khunt, Hasmukh R., Piyush P. Pipaliya, Satish M. Ghelani, Jayesh S. Babariya, and Yogesh T. Naliapara. "Synthesis and Characterization of Fully Substituted Pyrimidines by Using Ketene Dithioacetal as Potent Antimicrobial Agent." International Letters of Chemistry, Physics and Astronomy 24 (December 2013): 134–41. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.24.134.

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Various ketene dithioacetals of acetoacetanilides were reacted with guanidine nitrate in the presence of base to produce the 2-amino-4-isopropyl-6-alkoxy-N-arylpyrimidine-5-carboxamide derivatives with good yields. All the synthesized compounds were characterized by mass, NMR and IR and also evaluated for antimicrobial activity against five different bacterial and fungal strains. The compounds 4i, 4k and 4l has found comparatively good active against all the bacterial strains.

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45

Almalki, Abdulraheem S. A., Syed Nazreen, Azizah M. Malebari, et al. "Synthesis and Biological Evaluation of 1,2,3-Triazole Tethered Thymol-1,3,4-Oxadiazole Derivatives as Anticancer and Antimicrobial Agents." Pharmaceuticals 14, no. 9 (2021): 866. http://dx.doi.org/10.3390/ph14090866.

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A library of 1,2,3-triazole-incorporated thymol-1,3,4-oxadiazole derivatives (6–18) hasbeen synthesized and tested for anticancer and antimicrobial activities. Compounds 7, 8, 9, 10, and 11 exhibited significant antiproliferative activity. Among these active derivatives, compound 2-(4-((5-((2-isopropyl-5-methylphenoxy)methyl)-1,3,4-oxadiazol-2-ylthio)methyl)-1H-1,2,3-triazol-1-yl)phenol (9) was the best compound against all three tested cell lines, MCF-7 (IC50 1.1 μM), HCT-116 (IC50 2.6 μM), and HepG2 (IC50 1.4 μM). Compound 9 was found to be better than the standard drugs, doxorubicin and 5-f

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46

Chhikara, Bhupender S., M. Sudershan Rao, V. Kameshwara Rao, et al. "Carbocyclodipeptides as modified nucleosides: synthesis and anti-HIV activities." Canadian Journal of Chemistry 92, no. 12 (2014): 1145–49. http://dx.doi.org/10.1139/cjc-2014-0356.

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A new class of nucleoside analogues were synthesized using cyclic dipeptides and modified 2′-deoxyfuranoribose sugars to introduce flexibility by peptides in place of common nucleoside bases and to determine their biological properties. The synthesis was carried out by coupling of a protected ribose sugar with synthesized dipeptides in the presence of hexamethyldisilazane and trimethylsilyltriflate. The final products were characterized by NMR and high-resolution MS-TOF spectroscopy. The compounds were evaluated for anti-HIV activities. 1-(4-Azido-5-(hydroxymethyl)tetrahydrofuran-2-yl)-3,6-dii

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47

Larionov, S. V., L. A. Patrina, S. N. Dolgoruk, E. G. Boguslavskii, I. Kovachik, and V. B. Durasov. "Volatile intracomplex compounds with a spin-labeled enaminoketone containing an isopropyl group." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 37, no. 5 (1988): 997–1002. http://dx.doi.org/10.1007/bf00957078.

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48

St-Gelais, Alexis, Eliana M. Maldonado, Gloria Saavedra, et al. "Essential Oils from Bolivia. XV. Herzogole, an Original Monoterpene Benzodioxole from an Essential Oil from Pentacalia herzogii (Cabrera) Cuatrec." Molecules 26, no. 19 (2021): 5766. http://dx.doi.org/10.3390/molecules26195766.

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Over 15 years, with the support of a Canadian funding agency, the Universidad Mayor de San Simón, in Bolivia, undertook a large survey of aromatic plants of the South American country. More than a hundred species were studied under various aspects, including the production and characterization of essential oils. As part of this survey, the chemical composition of an essential oil sample obtained from Pentacalia herzogii (Asteraceae) growing wild in the High Valley region of the department of Cochabamba was determined by a combination of GC and GC-MS measurements. α-Pinene was the main constitu

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49

Runge, Steffen, and Mathias O. Senge. "Electron Donor-Acceptor Compounds. Synthesis and Structure of 5-(1,4-Benzoquinone-2-yl)-10,15,20-trialkylporphyrins." Zeitschrift für Naturforschung B 53, no. 9 (1998): 1021–30. http://dx.doi.org/10.1515/znb-1998-0914.

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Abstract A series of 5-(benzoquinone)-10,15,20-trialkylporphyrins was synthesized via cross condensation of the respective aldehydes, 2,5-dimethoxybenzaldehyde and pyrrole followed by demethylation with BBr3 and oxidation with PbO2. This method worked reasonably well for compounds bearing the benzoquinone substituent and butyl, isopropyl, 1 -methylpropyl and 2-ethylpropyl residues (2a-d). The free base porphyrin quinones were converted into the zinc(II) complexes (3a-d) all of which showed remarkable stability for porphyrin quinones. The zinc(II) complex 3c bearing isopropyl residues was inves

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50

Davis, Peter M., and Michael C. Qian. "Effect of Ethanol on the Adsorption of Volatile Sulfur Compounds on Solid Phase Micro-Extraction Fiber Coatings and the Implication for Analysis in Wine." Molecules 24, no. 18 (2019): 3392. http://dx.doi.org/10.3390/molecules24183392.

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Complications in the analysis of volatile sulfur compounds (VSC) in wine using solid-phase microextraction (SPME) arise from sample variability. Constituents of the wine matrix, including ethanol, affect the volatility and adsorption of sulfur volatiles on SPME fiber coatings (Carboxen- polydimethylsiloxane(PDMS); DVB-Carboxen-PDMS and DVB-PDMS), which can impact sensitivity and accuracy. Here, several common wine sulfur volatiles, including hydrogen sulfide (H2S), methanethiol (MeSH), dimethyl sulfide (DMS), dimethyl disulfide (DMDS), dimethyl trisulfide (DMTS), diethyl disulfide (DEDS), meth

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