A new method has been developed for the preparation of asymmetric polyfluoroketazines based on the reaction of polyfluorodialkyl ketone trialkylphosphinazines with perhaloketones. 1-Hydro-1,1,5,5-tetra(trifluoromethyl)-2-pentafluoroethyl-3,4-diaza-2,5-pentadiene and 1-hydro-1,1,5-tri(trifluoromethyl)-5-difluorochloromethyl-2-pentafluoroethyl-3,4-diaza-2,5-pentadiene were obtained in high yield.
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Bargamov, G.G., Kadyrov, A.A. & Bargamova, M.D. Polyfluorophosphinazines in the synthesis of asymmetric polyfluoroketazines. Russ Chem Bull 41, 1277–1279 (1992). https://doi.org/10.1007/BF00864197