Process for preparing alkyl or aryl phosphorus halides and mixed isomers thereof
USRE30279E · kind E · reissue
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51Claims
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Key dates
| Filing date | Jan 4, 1979 |
| Grant date | May 20, 1980 |
| Priority date | — |
| Expiry date | Jan 4, 1999 |
Classification
- Technology area (CPC —)General
Abstract
Alkyl or aryl phosphonic or phosphonothioic dihalides and phosphinic or phosphinothioic monohalides are prepared by reacting an alkyl halide or aryl halide respectively with a tri-valent phosphorus compound having at least two halogens attached thereto, and preferably three two halogens such as phosphorus trihalide, in the presence of P.sub.4 O.sub.10 or P.sub.4 S.sub.10 under at least autogenous pressure at a temperature of from 200.degree. C. to 450.degree. C. The compounds obtained are useful as constituents in insecticides, fungicides, pharmaceuticals, and as intermediates in preparation of other organophosphorus compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.