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1.
Muslin D. V. Lyapina N. Sh. Tyulina N. E. Khorshev S. Ya. Vavilina N. N. 《Russian Journal of General Chemistry》2001,71(8):1248-1251
Organosilicon aroxyls form disiloxybiaryls via C-C dimerization with simultaneous (or subsequent) isomerization of the dimeric intermediate, involving migration of the ortho-organosilyl substituents from carbon to oxygen. 相似文献
2.
Konstantin A. Kozhanov Michael P. Bubnov Nina N. Vavilina Larisa Yu. Efremova Georgy K. Fukin Vladimir K. Cherkasov Gleb A. Abakumov 《Polyhedron》2009,28(13):2555-2558
Structural study of dialkyl (PCP)-pincer o-semiquinonato nickel complexes indicated sloped relative positions of bi- and tri-dentate ligands. It became bright confirmation of propositions made on the base of their EPR spectra followed by molecular modelling. 相似文献
3.
G. A. Abakumov N. N. Vavilina L. N. Zakharov Yu. A. Kurskii V. I. Nevodchikov A. S. Shavyrin 《Russian Chemical Bulletin》2004,53(10):2276-2280
The structures of dimers formed from 2,5-di-tert-butylcyclopentadienone in the reaction with alkaline metals and in the Diels-Alder reaction were studied. A photochemical rearrangement with ring contraction was found for the second dimer. Spectral features of the dimers related to steric hindrance were studied by 1D and 2D NMR procedures.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2179–2183, October, 2004. 相似文献
4.
A. I. Poddel’sky I. V. Smolyaninov N. N. Vavilina Yu. A. Kurskii N. T. Berberova V. K. Cherkasov G. A. Abakumov 《Russian Journal of Coordination Chemistry》2012,38(4):284-294
A series of new binuclear bis(catecholate) antimony(V) complexes based on 1,1′-spirobis[3,3-dimethylindanequinone-5,6] with
various substituents at the central antimony atoms, R3Sb(Cat-Spiro-Cat)SbR3 (I–IV) and R3Sb(CatBr-Spiro-BrCat)SbR3 (V–VIII) (R = p-fluorophenyl, phenyl, p-tolyl, and ethyl), were synthesized. Spirobis(catecholates) I–III exhibit two one-electron oxidation waves on the cyclic voltammograms, whereas bromo-substituted spirobis(catecholates) V–VII undergo two-electron oxidation immediately at the first stage. The two-electron oxidation of the complexes results in the
loss of one of the organoantimony fragments and the formation of mononuclear catecholate-quinone complexes (Q-Spiro-Cat)SbR3 or (QBr-Spiro-BrCat)SbR3, respectively. An insignificant delocalization of the charge and spin between two redox centers is observed in the complexes.
The nature of substituents at the antimony atom exerts an effect on the values of redox potentials of the complexes: more
donating groups decrease the oxidation potentials of the catecholate fragments and more withdrawing groups increases these
values. 相似文献
5.
6.
G. A. Abakumov N. N. Vavilina Yu. A. Kurskii L. G. Abakumova G. K. Fukin V. K. Cherkasov A. S. Shavyrin E. V. Baranov 《Russian Chemical Bulletin》2007,56(9):1813-1820
According to the NMR spectroscopic data, the oxidation of triphenylantimony with 4-hydroperoxy-2-hydroxy-3,4,6-triisopropylcyclohexa-2,5-dienone
involves three steps. The first step affords the 2,4,10,12-tetraoxa-3,11-distibatricyclo[11.3.1.15,9]octadecatetraene derivative. The latter is rearranged into benzodioxastibolone derivatives followed by the rearrangement
into 4,6,7-triisopropyl-2,2,2-triphenyl-1,3,2-benzodioxastibol-5-ol. The transformation of the latter depends on the presence
of oxygen and the mode of its dosing.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1750–1757, September, 2007. 相似文献
7.
V. F. Mironov A. V. Bogdanov A. B. Dobrynin N. N. Vavilina V. K. Cherkasov I. A. Litvinov 《Russian Journal of Organic Chemistry》2012,48(7):948-952
The reaction of 3,4,6-triisopropyl-1,2-benzoquinone with phenylacetylene and phosphorus trichloride gave 2,6-dichloro-5,7,8-triisopropyl-4-phenyl-1,2??5-benzoxaphosphinine 2-oxide whose structure was determined by X-ray analysis. 相似文献
8.
G. Vavilina A. Zicmanis S. Drozdova P. Mekss M. Klavins 《Chemistry of Heterocyclic Compounds》2008,44(5):530-541
Alkylation of the ambident indole anion in ionic liquids has been investigated. The reaction rate is greater in ionic liquids
than in organic solvents. The polarity of certain ionic liquids has been determined to be located between methanol and acetonitrile.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 676–690. May, 2008. 相似文献
9.
Andrey I. Poddelsky Nina N. Vavilina Nikolay V. Somov Vladimir K. Cherkasov Gleb A. Abakumov 《Journal of organometallic chemistry》2009,694(21):3462-3469
The novel triethylantimony(v) o-amidophenolato (AP-R)SbEt3 (R = i-Pr, 1; R = Me, 2) and catecholato (3,6-DBCat)SbEt3 (3) complexes have been synthesized and characterized by IR, NMR spectroscopy (AP-R is 4,6-di-tert-butyl-N-(2,6-dialkylphenyl)-o-amidophenolate, alkyl = isopropyl (1) or methyl (2); 3,6-DBCat is 3,6-di-tert-butyl-catecholate). Complexes 1–3 have been obtained by the oxidative addition of corresponding o-iminobenzoquinones or o-benzoquinones to Et3Sb. The addition of 4,6-di-tert-butyl-N-(3,5-di-tert-butyl-2-hydroxyphenyl)-o-iminobenzoquinone to Et3Sb at low temperature gives hexacoordinate [(AP-AP)H]SbEt3 (4) which decomposes slowly in vacuum with the liberation of ethane yielding pentacoordinate complex [(AP-AP)]SbEt2 (5). [(AP-AP)H]2− is O,N,O′-tridentate amino-bis-(3,5-di-tert-butyl-phenolate-2-yl) dianion and [(AP-AP)]3− is amido-bis-(3,5-di-tert-butyl-phenolate-2-yl) trianion. The decomposition of 4–5 accelerates in the presence of air. o-Amidophenolates 1 and 2 bind molecular oxygen to give spiroendoperoxides Et3Sb[L-iPr]O2 (6) or Et3Sb[L-Me]O2 (7) containing trioxastibolane rings. This reaction proceeds slowly and reaches the equilibrium at 15–20% conversion five times more than for (AP-R)SbPh3 analogues. Molecular structures of 1 and 5 were determined by X-ray analysis. 相似文献
10.
Abakumov G. A. Vavilina N. N. Kurskii Yu. A. Nevodchikov V. I. Cherkasov V. K. Shavyr A. S. 《Russian Chemical Bulletin》2003,52(8):1847-1853
Auto-oxidation of 3,4,6-triisopropylcatechol affords crystalline 2-hydroxy-4-hydroperoxy-3,4,6-triisopropylcyclohexa-2,5-dienone. Thermal decomposition of the resulting hydroperoxide was carried out and the reaction products were determined. The decomposition mainly proceeds by a route without cleavage of the O—O bond, unusual for hydroperoxides, to give the starting 3,4,6-triisopropylcatechol and 3,4,6-triisopropylbenzo-1,2-quinone. The hydroperoxide decomposes in part according to the traditional pattern involving the O—O bond cleavage to give 3-hydroxy-2,5-diisopropylbenzo-1,4-quinone. 相似文献