Some unsaturated thioesters have interesting insecticidal activities.'Thioesters have attracted much attention as active esters for syntheses of macrocyclic lactones, 2 and consequently, a,@-unsaturated thioesters have been used for the synthesis of macrocyclic a,@-unsaturated lactone^.^ However, there are only a few reports on the preparation of a,@- unsaturated thioesters: reactions of a-carbanions of ethanethioate with carbonyl ...
