Stereospecific halogenolysis of β-styrylpyridinecobaloximes. A new general synthesis of isomeric β-halogenostyrenes
Abstract
Both cis- and trans-β-styrylpyridinecobal-oximes react by electrophilic substitution with elemental halogens in acetic acid to give the corresponding cis- and trans-β-halogeno-styrenes in high yields and with complete retention of configuration.