Chemistry of carbon compounds – Dipeptides – e.g. – aspartame – anserine – carnosine – etc.
Patent
1982-05-13
1983-08-30
Sutto, Anton H.
Chemistry of carbon compounds
Dipeptides, e.g., aspartame, anserine, carnosine, etc.
260960, C07F 920
Patent
active
044016050
ABSTRACT:
There is contemplated in the production of an O,O-dialkyl-phosphorothioic acid chloride of the formula ##STR1## in which R is alkyl, wherein a chlorinating agent is reacted with a bis(thiophosphono) sulfide of the formula ##STR2## in which m is a whole number, or with a dithiophosphoro compound of the formula ##STR3## in which M is hydrogen or an alkali metal, to produce a mixture comprising the desired acid chloride, some unreacted starting material and by-products including sulfur monochloride, and the desired acid chloride is separated from the balance of the mixture, the improvement which comprises contacting the mixture before separation with phosphorus trichloride, thereby to convert some of the unreacted starting material to additional desired acid chloride and to convert some of the sulfur monochloride to thiophosphoryl chloride, and distilling off the thiophosphoryl chloride, thereby avoiding precipitation of solid sulfur as occurs upon standing of sulfur monochloride.
REFERENCES:
patent: 3089890 (1963-05-01), Chupp
patent: 3897523 (1975-07-01), Sorstokke
Mobay Chemical Corporation
Sutto Anton H.
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