p-Tolylsulfonylacetonitrile reacted with allylic carbonates in the presence of a catalytic amount of hexacarbonylmolybdenum(0) to give monoallylated derivatives. Using sodium hydride as a base, methyl p-tolylsulfonylacetate reacted with those to give mixtures of mono- and di-allylated derivatives. No nucleophilic attack of bulky bis-(phenylsulfonyl)methane occurred, whether sodium hydride was present