A cesium salt has a unique catalytic ability for the reaction of alkynes with diphenyl dichalcogenides. When the diphenyl dichalcogenides, such as the disulfide, diselenide, or ditelluride, were allowed to react with alkynes in the presence of a catalytic amount of a cesium fluoride or carbonate, the bisphenylchalcogenolation of the alkynes efficiently proceeded to give the corresponding vic-bis(phenylchalcogeno)alkenes in moderate to good yields with high selectivity. When H2O was added to the reaction medium, monophenylchalcogenolation of the alkynes occurred giving the mono(phenylchalcogeno)alkenes in moderate yields.
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