SELECTIVITY IN THE PRODUCT-DISTRIBUTION UPON THE ADDITION OF DICHLOROCARBENE TO OLEFINS BY USE OF TERTIARY AMINES AS CATALYSTS
作者:Yoshikazu Kimura、Kakuzo Isagawa、Yoshio Otsuji
DOI:10.1246/cl.1977.951
日期:1977.8.5
The dichlorocarbene species generated from chloroform and aqueous sodium hydroxide in the presence of tertiary amines exhibits a high selectivity in the product-distribution upon its addition to olefins containing multiple double bonds; the monoadducts was produced in preference to the bisadducts. The selectivity increases with decrease in the reactivity of the dichlorocarbene species.
TfOH promoted reactions of vinyl gem- dichlorocyclopropanes with arenes: access to aryl gem -dichloropentenes
作者:Anna A. Kazakova、Anna A. Bogomazova、Roman O. Iakovenko、Simon S. Zlotsky、Aleksander V. Vasilyev
DOI:10.1016/j.tetlet.2016.08.008
日期:2016.9
under the action of the superacid TfOH afforded 3-aryl-1,1-dichloropent-1-enes (25–43% yield), as the products of cyclopropane ringopening. The reaction of 1,1-dichloro-2-methyl-2-vinylcyclopropane was realized as a two-step procedure, including initial in situgeneration of the corresponding triflate, 5,5-dichloro-4-methylpent-4-en-2-yl trifluoromethanesulfonate, from the cyclopropane and TfOH, followed
2-Hydroxy-3-methylcyclopent-2-en-1-one was synthesized in a five-step synthesis starting from 2-methyl-1,3-butadiene. Novel intermediate steps include the hot tube isomerization of 1,1-dihalo-2-methyl-2-vinylcyclopropane to give 1-methyl-4,4-dihalocyclopent-1-ene, hydrolysis to 3-methyl-2-cyclopenten-1-one, epoxidation of the latter using a phase transfer catalyst, followed by catalyzed isomerization to produce 2-hydroxy-3-methylcyclopent-2-en-1-one in high overall yield.
Single-Pot Ozonolytic Synthesis of Acylhydrazones from 1,1-Dichloro-2-ethenyl-2-methylcyclopropane
作者:Yu. V. Myasoedova、L. R. Garifullina、G. Z. Raskil’dina、S. S. Zlotskii、G. Yu. Ishmuratov
DOI:10.1134/s1070363221040265
日期:2021.4
on ozonolytic cleavage of 1-methyl-2,2-dichloro-1-ethenylcyclopropane in methanol and the treatment of intermediate peroxides with a twofold excess of hydrazides of a series of carboxylicacids (decanoic, cyclohexanecarboxylic, isonicotinic, benzoic, p- and o-hydroxybenzoic ones) has been suggested.
Dichlorocarbenation of conjugated diene hydrocarbons
作者:G. Z. Raskil’dina、Yu. G. Borisova、V. M. Yanybin、S. S. Zlotskii
DOI:10.1134/s0965544117020219
日期:2017.3
Partial and complete dichlorocarbenation of conjugateddiene hydrocarbons in the presence of the phase-transfer catalyst catamine AB has been studied. It has been shown that at the initial stages of the process (conversion of the reactant olefins below 30%), alkenyl-gem-dichlorocyclopropanes are the main products. In the case of complete carbenation, corresponding bicyclic structures are formed. The