39968-66-6Relevant articles and documents
The preparation of the last remaining acyclic isomers of benzene
Maurer, Helmut,Hopf, Henning
, p. 2702 - 2707 (2007/10/03)
The three acyclic isomers of benzene - 2,3-hexadien-5-yne, 3-methyl-1,2-pentadien-4-yne, and 1,2,3,4-hexatetraene have been prepared by simple routes from readily available starting materials. The hydrocarbons as well as several side products formed during their synthesis were characterized by their spectroscopic data and typical cycloaddition and isomerization reactions.
Chemistry of gem-Dihalocyclopropanes. XX. The Effect of Methyl and Phenyl Substituents on the Vinylcyclopropylidene-Cyclopentenylidene Rearrangement
Holm, Kjetil H.,Skatteboel, Lars
, p. 783 - 794 (2007/10/02)
Reactions of gem-dibromocyclopropanes of the general structure 1 with methyllithium have been studied.In the most cases cyclopentadienes and/or vinylallenes are the products formed.The results obtained give evidence of a profound substituent effect on the carbene-carbene rearrangement leading to cyclopentadienes.We believe the effect is essentially steric in origin.The results support the mechanism proposed for the rearrangement.