Process for preparing O,O-dimethyldithiophosphoric acid and alka

Details Process for preparing O,O-dimethyldithiophosphoric acid and alka Process for preparing O,O-dimethyldithiophosphoric acid and alka

1975-01-10

1977-09-20

Raymond, Richard L.

Chemistry of carbon compounds

Dipeptides, e.g., aspartame, anserine, carnosine, etc.

260981, C07F 917

Patent

active

040497550

ABSTRACT:
Colorless O,O-dimethyldithiophosphoric acid is produced by reaction between a phosphorus sulfide, in particular P.sub.4 S.sub.7 or P.sub.4 S.sub.10, and methanol, at temperatures of 60.degree.-75.degree. C, with short reaction times, and using toluene as diluent. Colorless alkaline salts of the acid are obtained by neutralizing the toluene solution of the acid at a temperature higher than 30.degree. C and at a pH maintained at 2 to 6.

REFERENCES:
patent: 3070619 (1962-12-01), Lanham
patent: 3337654 (1967-08-01), Cyba
patent: 3361668 (1968-01-01), Wiese
Houben-Weyl, Methoden der Organischen Chemie, 12/2/1964, pp. 684 to 688.

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