C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
260/460.1
C07F 9/20 (2006.01) C07F 9/02 (2006.01)
Patent
CA 1192569
ABSTRACT OF THE DISCLOSURE There is contemplated in the production of an O,O-dialkyl- phosphorothioic acid chloride of the formula Image in which R is alkyl, wherein a chlorinating agent is reacted with a bis(thiophos- phono) sulfide of the formula Image in which m is a whole number, or with a dithiophosphoro compound of the formula Image in which M is hydrogen or an alkali metal, to produce a mixture comprising the desired acide chloride, some unreacted starting material and by-products including sulfur monochloride, and the desired acid chloride is separ- ated from the balance of the mixture, the improvement which comprises contacting the mixture before separation with phosphorus trichloride, thereby to convert some of the un- reacted starting material to additional desired acid chloride and to convert some of the sulfur monochloride to thiophos- phoryl chloride, and distilling off the thiophosphoryl chloride, thereby avoiding precipitation of solid sulfur as occurs upon standing of sulfur monochloride.
422230
Fetherstonhaugh & Co.
Mobay Chemical Corporation
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