Platinum (II)[1] and gold (I)[1a, 2] catalysis have experienced significant growth over the past five years, as these late transition metals have the ability to catalyze atom economical reactions of unactivated alkynes, olefins, or allenes, creating a significant increase in the molecular complexity of a single synthetic step by using simple starting materials. The catalysts are compatible with most functional groups because of their low oxophilicity, and ...