BIS(POLYFLUOROALKYL)DIAZOMETHANES CONTAINING THE L-H-HEXAFLUOROISOPROPYL GROUP

New bis(polyfluoroalkyl)diazomethanes have been obtained in high yield by the oxidation of polyfluorinated ketone hydrazones with bromine in water. A one-step preparative procedure for obtaining hexafluoroisopr opyl-pentafluoroethylketone hydrazone from perfluoro-2-methyl-pent-2-e ne and hydrazine hydrate has been worked out. Some reactions of the di azo compounds obtained, such as thermolysis, catalytic decomposition u nder the action of Et(3)N and interaction with P(OR)(3) and PPh(3), ha ve been studied. Diazomethane with the 1-H-hexafluoroisopropyl group h as been shown to be a suitable starting material for the preparation o f the previously unobtainable perfluoro-1,2-dialkyl-substituted cyclop ropene.