Spirocyclopropanated Bicyclopropylidenes: Straightforward Preparation, Physical Properties, and Chemical Transformations
作者:Armin de Meijere、Malte von Seebach、Stefan Zöllner、Sergei I. Kozhushkov、Vladimir N. Belov、Roland Boese、Thomas Haumann、Jordi Benet-Buchholz、Dmitrii S. Yufit、Judith A. K. Howard
"third-generation" perspirocyclopropanated dicyclopropylidenemethane 38 (21% yield). Mechanistic aspects of this and the other unusual reactions are discussed. The structures of all newunusual hydrocarbons were proven by X-raycrystalstructure analyses, and the most interesting structural and crystal packing features are presented.
Carbenoid rearrangement of gem-dihalogenospiropentanes
作者:Elena B. Averina、Rashad R. Karimov、Kseniya N. Sedenkova、Yurii K. Grishin、Tamara S. Kuznetzova、Nikolai S. Zefirov
DOI:10.1016/j.tet.2006.06.086
日期:2006.9
A skeletal rearrangement of dihalogenospiropentanes in the presence of alkyllithium reagents has been systematically studied using a number of gem-dibromospiropentanes. The scope and limitations of this carbenoid rearrangement are outlined and its mechanism is discussed. (c) 2006 Elsevier Ltd. All rights reserved.
Carbenoid rearrangement in the series of substituted gem-dibromospiropentanes
作者:K. N. Sedenkova、E. B. Averina、Yu. K. Grishin、T. S. Kuznetsova、N. S. Zefirov
DOI:10.1134/s1070428008070038
日期:2008.7
A series of new substituted gem-dibromospiropentanes was studied in a reaction with methyllithium at -55...-50 degrees C. This reaction is a carbenoid rearrangement that leads to the formation of monomeric and dimeric bromocyclobutenes and also to the products of cyclobutylidene insertion into a C-H bond of the solvent depending on the character of substituents in the dibromospiropentane fragment.
A Third-Generation Bicyclopropylidene: Straightforward Preparation of 15,15′-Bis(hexaspiro[2.0.2.0.0.0.2.0.2.0.1.0]pentadecylidene) and aC2v-Symmetric Branched [15]Triangulane
作者:Malte von Seebach、Sergei I. Kozhushkov、Roland Boese、Jordi Benet-Buchholz、Dmitrii S. Yufit、Judith A. K. Howard、Armin de Meijere