Copper‐Catalyzed Trifluoromethylation of Hydrazones Leading to the Formation of Quaternary α‐Trifluoromethyl Diazenes

Abstract The copper‐catalyzed azomethine trifluoromethylation of ketone‐derived hydrazones with Togni′s hypervalent iodine(III)‐CF 3 reagent is described. The reaction gives rise to quaternary α‐trifluoromethyl diazenes under mild conditions and is proposed to proceed via a radical process.