Manganese‐Catalyzed C−H Olefination Reactions

Olefins are essential building blocks in organic synthesis, the access to which from simple C−H substrates through catalysis of transition metals, in particular the earth's abundant ones meets the requirements of green and sustainable chemistry. Manganese‐catalyzed C−H olefination reactions have emerged as an efficient approach to olefins in recent years, complementary to traditional olefin synthesis. Varieties of alkynes, alkenes, allenes as well as alcohols are successfully applied to the Mn‐catalyzed reactions with C−H substrates, providing multisubstituted olefins bearing varied functional groups. This minireview presents great progresses newly achieved on manganese‐catalyzed C−H olefination reactions. Always Olefination: Manganese‐catalyzed C−H olefination has made explosive developments in the recent five years. Varieties of alkynes, alkenes, allenes as well as alcohols are successfully applied to these reactions, providing an efficient access to multiply substituted olefins. This minireview summarizes recent manganese‐catalyzed C−H olefination reactions.