Recent Developments in Pd‐Catalyzed Reactions of Diazo Compounds

Pd‐catalyzed reactions of diazo compounds result in unique transformations that are distinct from those of traditional processes catalyzed by Rh II or Cu I catalysts. Pd carbene migratory insertion was deemed to be the key step in a series of Pd‐catalyzed reactions of diazo compounds. The combination of this unique reaction and classic Pd‐catalyzed cross‐coupling provides new potential for the development of novel Pd‐catalyzed transformations, in particular for C=C double bond formation.