33027-68-8

The invention discloses a preparation method of pentafluoro aromatic oxyl cyclotriphosphazene. The preparation method comprises: (1) adding hexachlorocyclotriphosphazene, a fluorinating agent and an organic solvent to a reaction container, and carrying out a reaction at a temperature of -30-80 DEG C to obtain a hexachlorocyclotriphosphazene-containing reaction liquid; (2) carrying out water washing on the reaction liquid obtained in the step (1), carrying out standing liquid layering to obtain a hexachlorocyclotriphosphazene-containing ogranic phase, and distilling the organic phase to obtainhexachlorocyclotriphosphazene; (3) adding an organic solvent, a phenol, an acid binder and the hexafluorocyclotriphosphazene obtained in the step (2) to another reaction container, and carrying out areaction at a temperature of -30-80 DEG C to obtain a reaction liquid containing pentafluoro aromatic oxyl cyclotriphosphazene; and (4) carrying out rectification on the reaction liquid obtained in the step (3) to obtain the pentafluoro aromatic oxyl cyclotriphosphazene. The preparation method of the present invention has advantages of less side reactions and high yield, and is suitable for industrial large-scale production, wherein the yield is not less than 60%.

The present invention relates to a fluorination method for phosphonitrilic chloride trimer and its derivatives including using phosphonitrilic chloride or partially substituted phosphonitrilic chloride trimer as raw material to fluorinate with fluoridating agent in an ionic liquid to replace the chlorine in chloro-cyclotiphosphazene molecule. The present invention uses non-volatile and pollution free ionic liquids as solvent, and just controls a distillation temperature to get a hexafluorocyclotriphosphazene or derivatives thereof with high-purity. It overcomes the shortcoming of the average solvent system that the solvent forms azeotrope with products. The post-process is simple. The production rate is high, and the ionic liquid can be recycled. The present invention produces products with high purity.

The invention relates to a preparation method of pentafluoroalkoxy or phenoxy cyclotriphosphazene. The preparation method comprises the steps of taking hexachlorocyclotriphosphazene as raw material, using the nucleophilic reagent alkoxide (or phenoxide) t