Palladium-catalyzed cycloreduction of 5-allen-1-ynes

Abstract The palladium-catalyzed cycloreduction of 5-allen-1-ynes gave the corresponding 1,2-bisalkylidenecyclopentanes in excellent chemoselectivity and chemical yields. Incorporating an electron-withdrawing group at the acetylenic position showed to be better substrates for the present cycloreduction.