Carbonylative and hydrosilylative carbocyclization of 1,5-diynes for the synthesis of cyclic dienones

A rhodium complex, [Rh(acac)(CO)2], has been identified to catalyze the cyclization of various 1,5-diynes with hydrosilanes under an atmospheric pressure of carbon monoxide at room temperature. The cyclization of 1,5-diynes proceeds along with hydrosilylation and carbonylation to give derivatives of 2,5-dialkylidenecyclopentanone.