An intermolecularC(sp3)−Hamination reaction is reported that is promoted by internal oxidants and occurs via a C=N bond formation step. This intermolecularC(sp3)−Hamination reaction of trifluoromethyl ketones and aryldiazonium tetrafluoroborates affords various valuable trifluoroacetylated hydrazones in high yields with excellent E/Z selectivities. The salient features of this reaction type is