Patent ID: 6423873
Filing Date: 2002-07-23
Classification: C07F

Abstract:
A process for preparing phosphonium salts of the general formula I in which the substituents have the following meanings independently of one another:R aryl; X anion of an organic or inorganic acid selected from the group consisting of hydrohalic acids, sulfuric acid, sulfonic acids, phosphoric acid and C1-C6-alkanoic acids, by reacting 3,7,11-trimethyldodeca-1,4,6,10-tetraen-3-ol of the formula II with triarylphosphine and organic or inorganic acids selected from the group consisting of hydrohalic acids, sulfuric acid, sulfonic acids, phosphoric acid and C1-C6-alkanoic acids, wherein in a two-stage processa) initially a tertiary phosphonium salt of the formula III â€ƒin which the radicals R and X have the above mentioned meanings, is prepared at temperatures in the range from 0 to 15Â° C., and b) the tertiary phosphonium salt of the formula III which is formed is rearranged to the primary phosphonium salt of the formula I at temperatures in the range from 40 to 100Â° C.