共查询到20条相似文献,搜索用时 15 毫秒
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Xiu R Bu Donald Vanderveer Javier Santos Fu-Lian Hsu Jie Wang Kofi Bota 《Analytical sciences》2003,19(3):469-470
A nonlinear optical chromophore, 4,5-bis(4-dimethylaminophenyl)-2-(4-nitrophenyl)imidazole, was investigated by X-ray crystallography. The study focused on coplanarity among several aromatic rings, including phenyls and imidazole. Two phenyl rings with NMe2 groups are twisted by 46.39(3) degrees from each other. However, they are twisted by 23.05(5) degrees and 46.84(3) degrees from the imidazole, respectively. These unequal twists were elucidated by different conjugation pathways from the donors to the acceptor. The phenyl ring with the NO2 group is twisted by only 6.76(6) degrees from the imidazole. 相似文献
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P. A. Pavlov 《Russian Journal of Organic Chemistry》2001,37(9):1310-1312
1-(4-Nitrophenyl)pyrrole-2-carbaldehyde, its 5-bromo-, 4'5-dibromo derivatives react withhydrazoic acid in chloroform in the presence of Mg(ClO4)2·2.5H2O (Schmidt reaction) to form the corre-sponding pyrrole-2-carbonitriles. 相似文献
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Pyrrole aldehydes interact with oxidizing agents to yield products which are oxidized to different degrees. Pyrrolecarboxylic acids are formed under the influence of silver oxides, an alkaline solution of permanganate, and 2–10% sulfuric acid [1–3]. With peroxidation of hydrogen, 5-unsubstituted pyrrole aldehydes convert to pyrrolone [4], and pyrrol-2-aldehyde converts to succinimide [5]. Chromacetate and chromium sulfuric acids oxidize pyrrole aldehydes to maleinimides [3].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 495–499, April, 1982. 相似文献
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É. Baum L. I. Belen'kii V. G. Kul'nevich T. E. Goldovskaya 《Chemistry of Heterocyclic Compounds》1982,18(5):499-502
Depending on the amount of bromine, the bromination of 1-(4-nitrophenyl)-2-formylpyrrole with bromine in chloroform without a catalyst gives 5-bromo and 4,5-dibromo derivatives. 4-Bromo-1-(4-nitrophenyl)-2-formylpyrrole is formed in the presence of excess AlC13, while a mixture of 3,4- and 4,5-dibromo derivatives with preponderance of the latter is formed with excess bromine. The results are compared with the literature data on the bromination of 2-formylpyrrole, 2-formylfuran, and 2-formylthiophene and are interpreted with allowance for the electronacceptor effect of the p-nitrophenyl substituent attached to the nitrogen atom of the pyrrole ring.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 662–665, May, 1982. 相似文献
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Anica Markovac Ambalal R. Patel Maurice P. MontagneLa Arthur B. Ash 《Journal of heterocyclic chemistry》1977,14(1):147-148
The preparation of 4-(3-nitrophenyl)-2-pieoline (3) was accomplished in one step by the Zecher-Krohnke ring-closure reaction. Compound 3 is the starling material for 2-lormyl-4-(3-arninophenyl)pyridine thiosemicarbazone (4-APPT), a promising antineoplastie agent. 相似文献
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M. A. Sibiryakova G. F. Muzychenko T. P. Kosulina K. S. Pushkareva 《Chemistry of Heterocyclic Compounds》2006,42(7):875-881
The interaction has been investigated of 1-(4-nitrophenyl)pyrrolin-2-one with aromatic aldehydes in acetic anhydride in the
presence of catalytic amounts of pyridine. 1-(4-Nitrophenyl)pyrrolinium perchlorate has been synthesized and was put into
a condensation reaction with aromatic aldehydes. As a result 5-arylidene-1-(4-nitrophenyl)pyrrolin-2-onium perchlorates were
obtained.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 1015–1021, July, 2006. 相似文献
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The photoprocesses of nifedipine, a 4-(2-nitrophenyl)-1,4-dihydropyridine, and nimodipine and nitrendipine, two 3-nitrophenyl Hantzsch-type analogues, were studied by steady-state and time-resolved methods. The intramolecular photoreduction of nifedipine into its nitrosophenyl product takes place within a few ns. The quantum yield of conversion is Φred = 0.3 and does not depend significantly on the oxygen concentration and solvent properties. Formation of the fully reduced 4-(2-aminophenyl)-1,4-dihydropyridine as minor product is indicated by fluorescence spectroscopy. The photoreduction of nimodipine and nitrendipine is inefficient, Φred = 0.002 in acetonitrile, but markedly enhanced in the presence of donors such as triethylamine (TEA) and 2-propanol, e.g. for TEA Φred is up to 0.03. The triplet states of nimodipine and nitrendipine were characterized. They react intermolecularly with TEA and 2-propanol, forming radicals as intermediates and eventually several reduction products. 相似文献
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É. Baum T. E. Goldovskaya V. G. Kul'nevich O. V. Maiorova 《Chemistry of Heterocyclic Compounds》1981,17(8):786-790
The products of the condensation of furfural with p-nitroaniline in an acidic medium in various solvents were investigated. It was established that the well-known method gives 1-(4-nitrophenyl)-2-formylpyrrole in no higher than 55% yield and 2,3-bis(4-nitrophenylamino)-2-formylpyrrole in 27% yield. A method based on a previously described method is recommended (the products are obtained in up to 72% yields).Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1062–1066, August, 1981. 相似文献
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In this study, we investigate the structural and spectroscopic properties of the thienyl chalcone derivative 3-(5-Bromo-2-thienyl)-1-(4-nitrophenyl)-prop-2-en-1-one, C13H8BrNO3S, using nuclear magnetic resonance (1H and 13C NMR), UV–vis and Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy at room conditions combined with density functional theory (DFT) and time-dependent DFT (TD-DFT) augmented with B3LYP/6-311G(d,p) and CAM-B3LYP/6-311G(d,p) basis sets, yielding valuable information on the molecular conformational preferences, vibrational assignments, optical properties and electronic transitions. The vibrational mode assignments of the most stable conformer of C13H8BrNO3S are discussed based on potential energy distribution (PED) analysis and establishing a comparison with a similar chemical structure. The temperature dependence on the Raman spectra of the C13H8BrNO3S shows a reversible phase transition in the range 443–443 K pointed out by the discontinuity in the dω/dT of bands in the external and internal modes region. The UV–vis spectrum of the C13H8BrNO3S indicates a semiconductor behavior with an optical band gap of 2.6 eV, corresponding to the predicted value of 3.42 eV assigned as the electronic transition from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO). TD-DFT calculations reveal that the electron donor and acceptor group substitution on the 1-phenyl-3-(thiophen-2-yl)prop-2-en-1-one affects its absorption and nonlinear activity. 相似文献
13.
The spectral kinetic characteristics of the triplet states of 1-(4-nitrophenyl)-3-methylpyrazole (1) and 1-ethyl-3-(4-nitrophenyl)-5-chloropyrazole (2) were studied by the laser nanosecond photolysis technique in different solvents. The triplet lifetimes (τT) of molecules 1 and 2 were found to depend strongly on the solvent nature. An increase in τT by approximately two orders of magnitude on going from nonpolar and polar aprotic solvents (τT ≤ 15 ns) to aqueous-acetonitrile solutions (τT = 1100 ns for a volume acetonitrile to water ratio of 1 : 3) was analyzed, taking into account the influence of the medium
on the relative contribution of the n,π*- and π,π*-configurations to the lowest triplet state.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 1115–1119, May, 2005. 相似文献
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I. V. Kulakov Z. M. Zhambekov S. D. Fazylov O. A. Nurkenov 《Russian Journal of General Chemistry》2008,78(12):2374-2378
By the ring cleavage of p-nitrophenyloxirane with p-chlorobenzylamine the corresponding chlorobenzyl- and nitrophenyl-substituted aminoethanol was obtained that was brought into reactions of glycosylation, reduction and substitution aimed at the preparation and designing of new structures containing pharmacalogically active functional groups. Among the synthesized compounds a compound is revealed possessing moderately expressed antibacterial and antifungal activity. 相似文献