排序方式: 共有70条查询结果,搜索用时 15 毫秒
61.
N. A. Korchevin N. V. Russavskaya G. A. Yakimova E. N. Deryagina 《Russian Journal of General Chemistry》2004,74(11):1754-1756
Two new synthetic approaches to 1,2-dithiole-3-thione are proposed. The title compound is formed by thermolysis of dipropyl polysulfides (n-Pr)2Sx (x = 3–4) and thermal decomposition of polysulfide dendrimers under reduced pressure. The latter reaction may be recommended for utilization of organochlorine waste products in the manufacture of epichlorohydrin, which are used for the synthesis of dendrimers.Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 11, 2004, pp. 1884–1886.Original Russian Text Copyright © 2004 by Korchevin, Russavskaya, Yakimova, Deryagina.This revised version was published online in April 2005 with a corrected cover date. 相似文献
62.
63.
64.
65.
V. Yu. Vshivtsev E. P. Levanova V. A. Grabel’nykh E. A. Sukhomazova A. I. Albanov L. V. Klyba E. R. Zhanchipova N. V. Russavskaya N. A. Kochervin 《Russian Journal of General Chemistry》2008,78(4):608-613
Ethylene chlorohydrin when reacted with elemental chalcogens or dimethyl dichalcogenides in the hydrazine hydrate-alkali system forms chalcogen-containing analogs of ethylene glycol and its derivatives (dichalcogenated β-diglycols, chalcogenated ethanols, and chalcogenated methyl cellosolves). 相似文献
66.
N. A. Korchevin N. V. Russavskaya O. V. Alekminskaya E. N. Deryagina 《Russian Journal of General Chemistry》2002,72(2):240-243
A simple procedure was developed for preparing bis(-mercaptoethyl) ether and bis(-ecraptoethyl) sulfide from commercially available chemicals: elemental sulfur, alkali, and bis(-chloroethyl) ether or sulfide, based on thiylation with elemental sulfur of these substrates in the aqueous system hydrazine hydratealkali, with initial formation of the corresponding polysulfide polymers (thiokols). Their reduction with the system hydrazine hydrate-alkali, followed by acidification of dithiolate anions, yields the corresponding dithiols. Thiokols based on bis(-chloroethyl) ether are soluble in organic solvents; they were studied by 1H NMR. 相似文献
67.
68.
E. P. Levanova V. S. Vakhrina V. A. Grabel’nykh I. B. Rozentsveig N. V. Russavskaya A. I. Albanov N. A. Korchevin 《Russian Journal of Organic Chemistry》2014,50(2):175-178
Diphenyl ditelluride reacts with 2,3-dichloroprop-1-ene in the system hydrazine hydrate-KOH along several parallel routes. Beside the nucleophilic chlorine substitution at the sp 3-hybridized carbon atom resulting in 2-chloro-3-phenyltellanylprop-1-ene the elimination of both chlorine atoms occurs affording a mixture of allene and methylacetylene. The reasons of the dual elimination reaction paths are considered. 相似文献
69.
E. P. Levanova V. A. Grabel’nykh V. S. Vakhrina N. V. Russavskaya A. I. Albanov L. V. Klyba N. A. Korchevin I. B. Rozentsveig 《Russian Journal of Organic Chemistry》2014,50(1):6-12
The direction of the reaction of propane-1,3-dichalcogenolates with 2,3-dichloroprop-1-ene in the system hydrazine hydrate-KOH depends not only on the conditions but to a greater extent on the chalcogen nature. Dipotassium propane-1,3-dithiolate and propane-1,3-diselenolate give rise to products of substitution of the chlorine atom on the sp 3-carbon atom, which are capable of undergoing further transformations (domino reaction). Dipotassium propane-1,3-ditellurolate promotes elimination of both chlorine atoms with formation of allene. 相似文献
70.
A. V. Elaev V. A. Grabel’nykh N. V. Russavskaya E. P. Levanova E. N. Sukhomazova E. R. Zhanchipova L. V. Klyba A. I. Albanov N. A. Korchevin 《Russian Journal of Organic Chemistry》2008,44(4):505-510
Chloromethyloxirane and 2,3-dibromopropan-1-ol reacted with a solution of selenium or tellurium in the system hydrazin hydrate-potassium hydroxide (K2Se2, K2Te2) to give allyl alcohol; the reaction was accompanied by regeneration of the initial free chalcogen. 1,3-Dichloropropan-2-ol reacted with selenium in the same system to give oligomeric product having a 2-hydroxypropane-1,3-diyldiseleno monomeric unit, while the reaction with tellurium led to the formation of allyl alcohol and almost complete regeneration of initial tellurium. Probable reaction mechanisms are discussed. Polyselenide oligomers containing a hydroxy group in a monomeric unit were formed in reactions of chloromethyloxirane and 1,3-dichloropropan-2-ol with selenium in the system hydrazine hydrate-2-aminoethanol. Under analogous conditions 2,3-dibromopropan-1-ol was converted into allyl alcohol with regeneration of elemental selenium. Reductive cleavage of polyselenide oligomers gave Se-methyl derivatives of 2-hydroxypropane-1,3-diselenol. 相似文献