Transition metal-catalyzed synthesis of (E)-2-(Alkylthio)alka-1,3-dienes from allenes and dialkyl disulfides with concomitant hydride transfer

Reaction of dialkyl disulfides or diselenides with allenes is catalyzed by a rhodium-phosphine complex and trifluoromethanesulfonic acid giving (E)-2-alkylthio(seleno)-1,3-dienes and (E)-2-alkylthio(seleno)-2-alkenes. Unlike the reaction of alkynes, the reaction of allene is accompanied by hydride transfer.