The Rearrangement of 1,1-Dicyclopropylethylene

Reactions of azo and azoxy sulphones with transition metal complexes. Part 7. Arylation of olefins with arylazoxy aryl sulphones catalysed by a palladium(0) phosphine complex

“…23 Colourless oil; v,,,. (m/z 144 (M', loo%), 129(91), 115(48), and 91(13).3-Phenylcyclopentene: 24 Colourless oil; v,,,.…”

The Synthesis of Cycloalkenes by the Intramolecular Wittig Reaction

“…Syntheses. -The intramolecular Wittig reaction was applied to the synthesis of bicyclo [4.4.0]-1 (2)-decene( = d l 9 9-octalin ; 1) [2], the hydrindenes bicyclo [4.3 .O]-1 (2)-nonene (2) and bicyclo[4.3.0]-1(9)-nonene (3) [3], bicyclo[3.3.0]-1(2)-octene (20) [26], and the two new octahydroazulenes bicyclo[S.3.0]-1(2)-decene (21) and bicyclo[S.3.0]-1( 10)-decene (22). 20 21 22 The prerequisite w-bromoalkylketones 23-28 were prepared following a general method of Muyer [27] and Christol [28].…”

Three-Membered-Ring-Based Molecular Architectures

“…The reactions of this phosphonium ylide with alkylcyclopropylketones led to substituted dicyclopropylethenes like 518, whereas air oxidation furnished unsubstituted 1,2-dicyclopropylethene 517 (Scheme 84). 353 Wittig olefinations of appropriate carbonyl compounds with methylenetriphenylphosphorane and with 515 were used to prepare 1,1-(382), 354 cis-1,2-(cis-517), and trans-1,2-dicyclopropylethene (trans-517), as well as tricyclopropylethene (519). 355,356 The mixture of diastereomeric cis-517 and trans-517 could be separated by vapor-phase chromatography.…”