Process for preparing phosphorothioates and phenylphosphonothioa

Details Process for preparing phosphorothioates and phenylphosphonothioa Process for preparing phosphorothioates and phenylphosphonothioa

1975-07-31

1977-06-07

Sutto, Anton H.

Chemistry of carbon compounds

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

260930, 260940, 260948, 260949, 260951, 260954, C07F 909, C07F 9165

Patent

active

040284395

ABSTRACT:
Mixtures of (1) a quaternary ammonium salt(s) and (2) a diazole are novel catalysts in the process of reacting an alkali metal phenate, pyridinate or pyrimidinate with an O,O-dialkyl phosphorochloridothioate or O-alkyl phenylphosphonochloridothioate to produce the corresponding title compounds. The process is conducted under alkaline conditions in a liquid reaction medium. As an example, O,O-diethyl O-(3,5,6-trichloro-2-pyridyl)phosphorothioate is prepared in excellent yields and purity by reacting sodium 3,5,6-trichloro-2-pyridinate with O,O-diethyl phosphorochloridothioate in a stirred methylene chloride-water reaction medium in the presence of a catalytic amount of benzyltriethylammonium chloride and 1-methylimidazole.

REFERENCES:
patent: 3689602 (1972-09-01), Ismail

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