Electrochemical cyclodimerization of alkylidenemalonates
作者:Michail N. Elinson、Sergey K. Feducovich、Alexandre A. Zakharenkov、Bogdan I. Ugrak、Gennady I. Nikishin、Sergey V. Lindeman、Jurii T. Struchkov
DOI:10.1016/0040-4020(95)98700-r
日期:1995.4
in MeOH in the presence of alkalimetalhalide as mediator, leads to the formation of cyclic dimers, i.e., 3,4-disubstituted 1,1,2,2-cyclobutanetetracarboxylates. The reaction proceeds via the reductive coupling of two substrate molecules at cathode and the cyclization of a hydrodimer dianion by its interaction with an active form of a mediator, an anode-generated halogen.
The treatment of cyclopropanes having donor and acceptor substituents at the vicinal positions on the cyclopropane ring with a Lewis acid readily generates a 1, 3-zwitterion, which reacted with allylsilanes to produce cycloadducts and allylic products. It was found that the yield of the cycloadduct depends on the steric demand of the alkyl substituents on the silicon atom.
Verhe, R.; De Kimpe, N.; De Buyck, L., Bulletin des Societes Chimiques Belges, 1983, vol. 92, # 4, p. 371 - 396
作者:Verhe, R.、De Kimpe, N.、De Buyck, L.、Courtheyn, D.、Caenegem, L. Van、Schamp, N.
DOI:——
日期:——
Electrochemical transformation of alkylidenemalonates into 2-alkyl-3,3-dimethoxyalkane-1,1-dicarboxylates via rearrangement
作者:Gennady I. Nikishin、Michail N. Elinson、Sergey K. Feducovich
DOI:10.1016/s0040-4039(00)74890-8
日期:1991.2
Alkylidenemalonates capable of migration of a double bond being electrolyzed in methanol in the presence of alkali metal halides in an undivided cell are transformed into 2-alkyl-3,3-dimethoxyalkane-1,1-dicarboxylates, acidification of which leads to 2-alkyl-3-oxoalkane-1,1-dicarboxylates.
Mass spectrometric studies of cyclopropanes with electronegative substituents. Indication of methoxy group randomization in (±) dimethyl 2-methoxy-3,3-dimethylcyclopropane-1,1-dicarboxylate
Abstract(±) 2‐Methoxy‐3,3‐dimethylcyclopropane‐1,1‐carboxylate was studied by electron impact and chemical ionization mass spectrometry. By using selective deuteration of the methyl groups, it was established that extensive randomization of the methoxy groups takes place prior to the decomposition of the molecular ion.