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21.
Summary A method was developed for the synthesis of 4-hydroxy-3,5-dialkylphenylacetic acids.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 376–378, February, 1965 相似文献
22.
T. I. Prokof’eva V. B. Vol’eva I. S. Belostotskaya N. L. Komissarova A. V. Malkova 《Russian Journal of Organic Chemistry》2011,47(7):1015-1017
Chlorination of 3,6-di-tert-butyl-1,2-benzoquinone in a two-phase catalytic system (CH2Cl2, HCl- H2O, H2O2, Bu4NCl) led to halogen addition at the C=C bond, and subsequent dehydrochlorination of the adduct gave 3,6-di-tert-butyl-4-chloro-1,2-benzoquinone. Chlorination of the latter afforded 3,6-di-tert-butyl-4,5-dichloro-1,2-benzoquinone. 相似文献
23.
V. B. Vol’eva I. S. Belostotskaya N. L. Komissarova L. N. Kurkovskaya 《Russian Journal of Organic Chemistry》2008,44(6):803-806
Products of the reactions of 4- and 2-hydroxy-3,5-di-tert-butyl-benzaldehydes with malonic acid, diethyl malonate, and acetic anhydride in the presence of weak bases were isolated and identified. The reactions of 3,5-di-tert-butyl-4-hydroxybenzaldehyde with malonic acid and acetic anhydride in the presence of sodium acetate and piperidine gave 3,5-di-tert-butyl-4-hydroxycinnamic acid. The reaction of its 2-hydroxy isomer with acetic anhydride stopped at the stage of formation of the corresponding O-acetyl derivative, while in the reaction with malonic acid the corresponding substituted cinnamic acid and its lactone (coumarin derivative) were formed as intermediate products in a transformation sequence finally leading to 3-(3,5-di-tertbutyl-2-hydroxyphenyl)-3-piperidinopropionic acid and 6,8-di-tert-butyl-2-oxo-3,4-dihydro-2H-chromen-4-ylacetic acid. Analogous differences were typical of reactions of isomeric 4- and 2-hydroxy-3,5-di-tert-butylbenzaldehydes with diethyl malonate. The transformations of the 2-hydroxy isomer were accompanied by hydrolysis and formation of an adduct of intermediate coumarin derivative with diethyl malonate and piperidine. 相似文献
24.
V. B. Vol'eva I. S. Belostotskaya N. L. Komissarova É. V. Dzhuaryan V. V. Ershov 《Russian Chemical Bulletin》1974,23(11):2507-2509
Conclusions The role of internal catalysis during one-electron oxidation of hydroxyaromatic compounds by mercuric salts, the possibility of which is determined by the nature of the salt anion, was shown.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2601–2603, November, 1974. 相似文献
25.
I. S. Belostotskaya V. B. Vol'eva N. L. Komissarova M. A. Dokukina E. V. Poddymai A. Yu. Karmilov A. A. Khzardzhyan V. V. Ershov N. S. Enikolopyan 《Russian Chemical Bulletin》1990,39(8):1756-1756
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1930–1931, August, 1990. 相似文献
26.
Conclusions The hydroxyl groups in 3,6-di-tert-butylpyrocatechol were protected by converting it to either cyclic acetals or ketals.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2808–2810, December, 1973. 相似文献
27.
I. S. Belostotskaya N. L. Komissarova T. I. Prokof’eva L. N. Kurkovskaya V. B. Vol’eva 《Russian Journal of Organic Chemistry》2005,41(5):703-706
Reaction of 2,4-di-tert-butylphenol with urotropin in conditions of Duff reaction takes an abnormal route and instead of the expected di-tert-butylsalicylaldehyde provides a mixture of N-substituted 3,5-di-tert-butyl-2-hydroxybenzylamines and redox conjugate benzoxazines containing mostly 6,8-di-tert-butyl-3-(3,5-di-tert-butyl-2-hydroxybenzyl)-2H-3,4-dihydrobenz[e][1,3]oxazine. A solvolysis of an individual benzoxazine in the system HO(CH2)2OH-H2O-HCl affords di(3,5-di-tert-butyl-2-hydroxybenzyl)amine, and in AcOH 3,5-di-tert-butylsalicilaldehyde. A mechanism of Duff reaction was suggested involving the formation of a benzoxazine intermediate.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 5, 2005, pp. 718–721.Original Russian Text Copyright © 2005 by Belostotskaya, Komissarova, Prokof’eva, Kurkovskaya, Vol’eva. 相似文献
28.
29.
Conclusions A method was proposed for determining molecular complexes from the EPR spectra of the radical pairs that are formed during the photolysis of frozen solutions. The method has a greater range of application than the ordinary spectrophotometric method.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 625–626, March, 1979. 相似文献
30.
V. B. Vol’eva I. S. Belostotskaya N. L. Komissarova A. V. Malkova T. V. Pokholok E. Ya. Davydov 《Russian Journal of Organic Chemistry》2013,49(3):446-449
1,3-Benzodioxoles synthesized by condensation of 3,6-di-tert-butylbenzene-1,2-diol with carbonyl compounds showed antiradical activity due to their ability to undergo one-electron oxidation with formation of stable radical cations. On this basis, the antiknock effect of their structural analogs, 1,3-dioxolanes derived from vicinal diols, was interpreted in terms of oxidation of these compounds with active radicals generated from fuel hydrocarbons to produce more stable radical or radical ion species, depending on the fuel composition. The formation of radical species was detected in model oxidation reactions of 2,2-dimethyl-1,3-dioxolane and 2,2-dimethyl-1,3-dioxolan-4-ylmethanol with radicals generated by photolysis of iron(III) chloride and benzoyl peroxide. 相似文献