Recent Advances and Perspectives in Transition Metal‐Catalyzed 1,4‐Functionalizations of Unactivated 1,3‐Enynes for the Synthesis of Allenes

Classic methods for the synthesis of allenes usually introduce only one functional group into products. In this review, we highlight the recent advances and perspectives in the synthesis of allenes by transition metal‐catalyzed 1,4‐functionalization of unactivated 1,3‐enynes.