Production of O,O-dialkyl-phosphorochloridothionates

Details Production of O,O-dialkyl-phosphorochloridothionates Production of O,O-dialkyl-phosphorochloridothionates

1976-06-01

1978-02-21

Sutto, Anton H.

Chemistry of carbon compounds

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

C07F 9146

Patent

active

040752925

ABSTRACT:
An O,O-dialkyl-dithiophosphoric acid ester is reacted in two steps with approximately an equimolar amount of chlorine, the first step at about 0.degree. to 80.degree. C with all the reactants supplied, and the second step at about 0.degree. to 100.degree. C with precipitation of sulfur from the disulfur dichloride which is produced as a by-product in the first step and which serves as the chlorinating agent in the second step. Advantageously the first step is carried out continuously in two stages about one-third to two-thirds of the chlorine being supplied continuously to each stage. The first stage is at about 30.degree. to 60.degree. C and the second stage at about 10.degree. to 25.degree. C. The second step is thereafter performed batchwise and the desired product is distilled off from the residual sulfur.

REFERENCES:
patent: 3836610 (1974-09-01), Diveley
patent: 3897523 (1975-07-01), Sorstokke

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