Process for preparing alkyl- or arylphosphonothioic dihalides

Details Process for preparing alkyl- or arylphosphonothioic dihalides Process for preparing alkyl- or arylphosphonothioic dihalides

C - Chemistry, Metallurgy

07

F

260/537.8

C07F 9/42 (2006.01)

Patent

CA 1064050

ABSTRACT OF THE DISCLOSURE Alkyl- or arylphosphonothioic dihalides are prepared by contacting an alkyl or aryl halide with a trivalent phos- phorus 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 combinations of phosphorus sulfides, for example, P4S3, P4S5, P4S7 or P4S10 under at least autogenous pressure at a temperature of from about 175°C to about 400°C. The compounds obtained are useful as constituents in insecticides, fungicides, pharmaceuticals, and as intermediates in preparation of other organophosphorus compounds.

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