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8328322 
Journal Article 
Synthesis of hexachlorocyclotriphosphazene catalyzed by [Py] Cl-ZnCl2 ionic liquid 
Sun, D; Xu, Z 
2010 
Chk 
Huaxue Fanying Gongcheng yu Gongyi / Chemical Reactive Engineering and Technology
ISSN: 1001-7631 
26 
5 
472-476 
Chinese 
Lewis acidic ionic liquids were synthesized by combining ZnCl2 with pyridinium chloride and were used to catalyze the synthesis of hexachlorocyclotriphosphazene by phosphorus pentachloride and ammonium chloride in an inert organic solvent. Compared with the reaction performed over ZnCl2 catalyst in the conventional organic solvent, rate-enhancement and higher yield for hexachlorocyclotriphosphazene were obtained in the [Py]Cl-ZnCl2 ionic liquids. When the reaction was performed at 132°C in the ionic liquids with the molar ratio of ZnCl2 to pyridinium chloride being 6:4, reaction time was only 3.1 h and hexachlorocyclotriphosphazene yield 80.95%. The ionic liquids were easily recycled after washing with hexane, allowing their reuse at least four times with no loss in activity and selectivity. 
Hexachlorocyclotriphosphazene; Ionic liquid; Lewis acid; Pyridinium chloride; Zinc chloride