Process for preparing phosphonium salts
US6423873B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2001 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Feb 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/5428
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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 triarylphosphane and organic or inorganic acids selected from the abovementioned group, wherein in a two-stage processa) initially a tertiary phosphonium salt of the formula III  in which the radicals R and X have the abovementioned meanings, is prepared at temperatures in the range from −20 to 40° C., andb) 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 100° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.