An efficient and practical approach to phosphonium salts has been developed. By the reaction of phosphines and different acid sources with orthoformates in one-step operation, the process allowed rapid access to phosphonium salts with diverse counterions in high yield after the purification by recrystallization. The flame retardant performance in PC has also been examined by blending several phosphonium salts to PC respectively. Phosphonium phosphates showed excellent flame retardancy in PC with only 2 phr blending.

中文翻译：

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邻甲酸酯类盐的实用合成及其在聚碳酸酯中的阻燃剂应用

已经开发了一种有效且实用的salts盐方法。通过膦和不同酸源与正甲酸酯在一步操作中的反应，该方法可以在通过重结晶纯化后以高收率快速获得具有各种抗衡离子的phospho盐。还已经通过将几种salts盐分别掺混到PC中来检查PC中的阻燃性能。磷酸os在PC中仅混合2 phr就显示出优异的阻燃性。