Patent · US Expired

Process for preparing alkyl-or arylphosphonothioic dihalides

US3968156A · kind A · utility

1Cited by
2References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 20, 1974
Grant dateJul 6, 1976
Priority date—
Expiry dateDec 20, 1994

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07F9/42
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

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.