BIS(POLYFLUOROALKYL)DIAZOMETHANES CONTAINING THE 1-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 hexafluoroisopropyl-pentafluoroethylketone hydrazone from perfluoro-2-methyl-pent-2-ene and hydrazine hydrate has been worked out. Some reactions of the diazo compounds obtained, such as thermolysis, catalytic decomposition under the action of Et(3)N and interaction with P(OR)(3) and PPh(3), have been studied. Diazomethane with the 1-H-hexafluoroisopropyl group has been shown to be a suitable starting material for the preparation of the previously unobtainable perfluoro-1,2-dialkyl-substituted cyclopropene.