Process for preparing alkyl- or arylphosphonothioic dihalides
USRE31300E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1979 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Jan 5, 1999 |
Classification
- Technology area (CPC —)General
Abstract
Alkyl- or arylphosphonothioic dihalides are prepared by contacting an alkyl or aryl halide with a trivalent phosphorus compound having three halogens attached thereto or a pentavalent thiophosphorus halide having three halogens attached thereto or mixtures of the trivalent and pentavalent phosphorus halides, in the presence of phosphorus sulfides, for example, P.sub.4 S.sub.3, P.sub.4 S.sub.7 or P.sub.4 S.sub.10 under at least autogenous pressure at a temperature of from about 175.degree. C. to about 400.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.