Abstract
Cyclocarbonylation of 3-butyn-1-ols catalyzed by cationic palladium complexes has been studied. Six-membered ring lactones were produced preferentially in acetonitrile using cationic complexes coordinated by certain chelating diphosphines as catalyst. A triphenylphosphine-coordinated cationic palladium complex, on the other hand, effected the formation of five-membered α-alkylidene lactones exclusively in N, N-dimethylformamide. A mechanism involving a palladium hydride as active species has been presumed for the formation of six-membered ring lactones.
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