1-Chlor-2-brom-aethylen;cis-1-bromo-2-chloro-ethene;cis-form of 2-chloro-1-bromo-ethene;cis-Form des 2-Chlor-1-brom-aethens;cis-2-Chloro-1-bromo-ethene;(Z)-1-bromo-2-chloroethene
We report the first stereoselective synthesis of stable (E)- and (Z)-β-chlorovinyl-λ3-chlorane via direct mesitylation of 1,2-dichloroethylene with mesityldiazonium tetrakis(pentafluorophenyl)borate under mild reaction conditions. The structure of the (E)-vinyl-λ3-chlorane was established by single-crystal X-ray analysis. Because of the enormously high leaving group ability of the aryl-λ3-chloranyl