共查询到20条相似文献,搜索用时 31 毫秒
1.
A. D. Dubonosov V. P. Rybalkin Ya. Yu. Vorob’eva V. A. Bren’ V. I. Minkin S. M. Aldoshin V. V. Tkachev A. V. Tsukanov 《Russian Chemical Bulletin》2004,53(10):2248-2252
It was shown by electron absorption spectroscopy and X-ray diffraction analysis that steric strains in photochromic 2-(N-acyl-N-arylaminomethylene) benzo[b]thiophen-3(2H)-one molecules ortho-substituted in the N-phenyl ring increase the quantum yield of the N→O photoinduced rearrangement in accord with an increase in the steric constant of the ortho-substituent.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2151–2155, October, 2004. 相似文献
2.
A. M. Golyakov A. N. Borisov G. A. Shagisultanova A. L. Shpilev 《Russian Journal of General Chemistry》2011,81(9):1867-1872
The electrochemical oxidation of N,N′-bis(3-methoxysalicylidene)-1,3-propylenediamine leads to the formation of conducting polymer on the electrode surface. The
decisive role of phenol oxygen in the formation of the polymeric forms of azomethine bases was elucidated. Optimal conditions
for the synthesis of the polymer in the potentiostatic conditions were revealed. The coefficient of the charge diffusion and
the activation barrier for the charge transfer in the polymer bulk in the electrolyte medium were determined. 相似文献
3.
Competitive complexation in the copper(II) chloride-N,N-dimethylformamide (DMF)-Aerosil system was studied by IR spectroscopy. It was found that adsorption from organic solutions containing copper(II) chloride and DMF resulted in the formation of the following three types of DMF complexes: self-associates of DMF, DMF complexes with surface hydroxyl groups, and DMF complexes with Cu(II) ions. The removal of DMF resulted in the sequential degradation of, initially, self-associates; next, complexes with silanol groups; and, finally, complexes with copper ions.Translated from Kinetika i Kataliz, Vol. 45, No. 6, 2004, pp. 917–920.Original Russian Text Copyright © 2004 by Golubeva, Zubareva. 相似文献
4.
E. G. Mesropyan A. S. Galstyan A. A. Avetisyan 《Russian Journal of Organic Chemistry》2010,46(9):1296-1300
The preparation of N-(oxiran-2-ylmethyl)-N-ethylaniline was developed. The compound was used in the synthesis of new N-derivatives of aromatic amines containing vicinal
aminoalcohol moieties. 相似文献
5.
A. D. Sinitsa A. A. Shalimov A. M. Nesterenko D. M. Malenko 《Russian Chemical Bulletin》2005,54(3):752-757
In the study of reactions of N-alkyl- and N-aryltrihalogenoacetamides with PCl5, it was demonstrated for the first time that 3-alkyl(aryl)-2,2,2,4 tetrachloro-4-trihalomethyl-1,3,2-λ5-oxazaphosphetanes are intermediates in the synthesis of trihaloacetimidoyl chlorides. According to quantum-chemical calculations, acyclic N-tetrachlorophosphoranes, which are the primary products in the reactions of trihaloacetamides with PCl5, undergo rapid cyclization into the corresponding phosphorates and subsequent 1,3-chlorotropic migration gives rise to oxazaphosphetanes with the five-coordinate P atom.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 739-744, March, 2005. 相似文献
6.
Cho Rong Kim Hyun Ji Kang Chi Won Kim Kyung Ho Yoo Ok-Sang Jung 《Transition Metal Chemistry》2009,34(6):579-584
The reaction of (COD)PdCl2 (COD = 1,5-cyclooctadiene) with (3-Py)2SiMe2 (bis(3-pyridyl)dimethylsilane) in acetone produces single crystals consisting of cyclodimers, [PdCl2((3-Py)2SiMe2)]2, whereas the similar reaction in a mixture of dichloromethane and ethanol yields amorphous submicrospheres consisting of
cyclotrimers, [PdCl2((3-Py)2SiMe2)]3. In a boiling chloroform solution, the cyclodimers are completely converted to the cyclotrimers. The structures of both cyclic
species are locked at temperatures below 0 °C. The cyclotrimer equilibrates to the cyclodimer, the cyclotrimer, and cyclotrimeric
mono-DMF adduct, [Pd3Cl5(DMF)((3-Py)2SiMe2)3]Cl in the mole ratio of 6:1:5 in DMF solution at room temperature. The cyclodimer finally reaches the equilibrium in the
same condition.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
7.
Background
Arylamine N-acetyltransferases (NATs) are important drug- and carcinogen-metabolising enzymes that catalyse the transfer of an acetyl group from a donor, such as acetyl coenzyme A, to an aromatic or heterocyclic amine, hydrazine, hydrazide or N-hydroxylamine acceptor substrate. NATs are found in eukaryotes and prokaryotes, and they may also have an endogenous function in addition to drug metabolism. For example, NAT from Mycobacterium tuberculosis has been proposed to have a role in cell wall lipid biosynthesis, and is therefore of interest as a potential drug target. To date there have been no studies investigating the kinetic mechanism of a bacterial NAT enzyme. 相似文献8.
I. V. Kulakov 《Chemistry of Natural Compounds》2009,45(4):522-524
Condensation of the monosaccharides D-glucose and D-galactose with synthesized halo-substituted p-phenylenediamines and 4-amino-2,6-dibromophenol was studied. It was found that glycosylation occurred only at the 4-amino
group that was sterically unhindered by the halogen atom. The position of the aglycon in the glycoside was established by
PMR spectroscopy. 相似文献
9.
Pyridine N-oxide reacts with 2- and 3-aminopyridines and their N-p-tolylsulfonyl derivatives in alkaline medium in the presence of p-toluenesulfonyl chloride to give N-p-tolylsulfonyl-2,2′- and 2,3′-dipyridylamines, respectively, as a result of reductive acylamination. In the reactions with 4-aminopyridine and 4-p-tolylsulfonyl-aminopyridine, their N-p-tolylsulfonyl- and N,N-bis(p-tolylsulfonyl) derivatives are formed, while reductive acylamination does not occur.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 1, 2005, pp. 128–130.Original Russian Text Copyright © 2005 by Solekhova, Kurbatov. 相似文献
10.
Fernando Blanco Ibon Alkorta Krzysztof Zborowski José Elguero 《Structural chemistry》2007,18(6):965-975
A theoretical study of the monosubstitution effects of all the atoms of the second and third row of the periodic table on
the pyrazole and imidazole rings has been carried out by means of B3LYP/6-31+G(d,p) DFT calculations. The geometric and electronic
properties, calculated using the atoms in molecules methodology, electrostatic potential, and frontier orbitals have been
analyzed. Some of the results have been rationalized based on the electronegativity of the substituents. In addition, the
different parameters obtained have been compared with aromaticity indexes (HOMA and NICS). A comparison with the results obtained
for the corresponding N-pyrrole derivatives has been carried out. 相似文献
11.
A. P. Avdeenko V. V. Pirozhenko M. V. Stanovskii S. A. Konovalova A. L. Yusina 《Russian Journal of Organic Chemistry》2004,40(9):1291-1294
Stable N-arylsulfinyl-1,4-benzoquinonimines were synthesized by acylation of the corresponding 1,4-benzoquinone monooximes with arenesulfenyl chlorides. The process involves transformation of sulfur(II) into sulfur(IV).Translated from Zhurnal Organicheskoi Khimii, Vol. 40, No. 9, 2004, pp. 1340–1343.Original Russian Text Copyright © 2004 by Avdeenko, Pirozhenko, Stanovskii, Konovalova, Yusina.This study was performed under financial support by the ES INTAS program (grant no. 00 157–1999) and by the Ministry of Education and Science of Ukraine. 相似文献
12.
Yu. A. Aizina I. B. Rozentsveig I. V. Ushakova G. G. Levkovskaya A. N. Mirskova 《Russian Journal of Organic Chemistry》2005,41(1):91-94
Reactions of N-(2,2,2-trichloroethylidene)arenesulfonamides with thiophene, 2-chlorothiophene, and 2,5-dichlorothiophene, as well as of N-(2,2,2-trichloro-1-hydroxyethyl)arenesulfonamides with 2-chlorothiophene, lead to formation of the corresponding N-(2,2,2-trichloro-1-thienylethyl)arenesulfonamides. Alkaline hydrolysis of the latter occurs selectively at the trichloromethyl group to give N-arylsulfonyl-α-thienylglycines.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 1, 2005, pp. 93–96.Original Russian Text Copyright © 2005 by Aizina, Rozentsveig, Ushakova, Levkovskaya, Mirskova. 相似文献
13.
Laila H. Abdel-Rahman Lobna A. E. Nasser Ramadan M. Ramadan 《Transition Metal Chemistry》2007,32(3):367-373
A series of some new cobalt(II) and nickel(II) ternary complexes of N-(acetyl)phenylalaninate (acphe), N-(acetyl)tyrosinate (actyr), N-(benzoyl)leucinate (bzleu), N-(benzoyl)phenylalaninate (bzphe), N-(tosyl)glutamic acid (tsglu), N-(tosyl)arginine (tsarg) with certain N-heterocyclic ligands such as imidazole (imi), methylimidazole (mimi), 2,2′-bipyridyl (bipy) 1,10-phenanthroline (phen) have
been synthesized and characterized by elemental analyses, IR and electronic spectra. as well as thermogravimetry. The structure
of the cobalt(II) N-phthaloylglycinate complex was also characterized by X-ray single crystal. It was found that the cobalt atom coordinates
a 1,10-phenanthroline molecule and four water oxygen atoms, forming a distorted octahedral conformation. A molecule of N-phthaloylglycinate is connected by van der Waals contact and H-bonds. 相似文献
14.
Yunchun Wang Zhongyuan Bai Zengjun Wei Shengzhen Xu Xuegang Li Jianhong Li Xiufang Cao Changshui Chen 《Research on Chemical Intermediates》2011,37(8):1029-1039
Twenty-two novel N-nitro-N′-substituted phenyl-N-(2,6-dibromo-4-fluorophenyl)urea derivatives were designed and synthesized via a simple and convenient BTC ‘one-pot’ procedure
using DMAP as the catalyst. The structures of all newly synthesized compounds were confirmed by IR, 1H NMR, and elemental analysis, and a part has been identified by 13C NMR. The preliminary bioassay indicates that the target compounds possesses moderate herbicidal activity against Sorghum sudanense. However, some of the title compounds presented high plant growth regulating activity against rape. 相似文献
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The Mitsunobu reaction is a well-established fundamental reaction and has been widely applied in organic synthesis. In this
paper, under Mitsunobu conditions dehydration proceeds between (2-chloroquinolin-3-yl)methanol and nitrogen heterocyclic compounds
such as quinazolinone, pyrimidone, 2-oxoquinoline in dry THF in the presence of triethylamine, triphenylphosphane and diethyl
azodicarboxylate to give the corresponding products. As part of our recent research, we attempted to couple two N-heterocyclic compounds under Mitsunobu reaction conditions to provide efficient building blocks for natural product synthesis. 相似文献
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A. Kh. Gyulnazaryan T. A. Sahakyan R. A. Tamazyan A. G. Ayvazyan G. A. Panosyan A. B. Yeremyan 《Russian Journal of General Chemistry》2017,87(10):2282-2286
Bromination of ammonium salts containing two propargyl groups afforded bromine-substituted derivatives of pyrrolinium salts. The reactions of piperidinium and morpholinium analogs resulted in spirocyclic ammonium salts. 相似文献