Tetrahedron Letters Vol. 22, pp 1089 - 1092 @Pergamon Press Ltd. 1981. Printed in Great Britain ... T. Aida, TH Ghan* and David N. Harpp* Department of Chemistry, McGill University Montreal, Quebec, Canada H3A 2K6 ... S~mrn&~ic and unhqmmeL&c d&-inyLic hutdides can be pheptied &ont ... We have extended our earlier work1 on the synthesis of vinylic sulfides to the construc- tion of the divinylic analogs for which a general preparation method has not ...