PRODUCTION AND USE OF QUATERNARY PHOSPHONIUM HALIDES

摘要

PRODUCTION AND USE OF QUATERNARY PHOSPHONIUM HALIDES Production of quaternary phosphonium halides of the general formula: ¢R1R2R3R4P!X, in which R1, R2, R3 and R4 stand for identical or different alkyl groups having from 1 to 4 carbon atoms and X stands for halogen, especially for chlorine or bromine. The compounds are more especially made by flowing hydrogen phosphide or a primary phosphine R1PH2 or secondary phosphine R1R2PH or tertiary phosphine R1R2R3P and an alkyl halide R4X in a molar ratio from 0.02 to 10, at a temperature from 100 to 500.degree.C, under a pressure of up to 10 atmospheres gauge and for a period from 0.5 to 500 seconds over a catalyst and separating the resulting quaternary phosphonium halides from the reaction gas. The halides so made are used for making trialkylphosphine oxides and trialkylphosphines.