Process for the preparation of neutral phosphorous acid aryl est

Details Process for the preparation of neutral phosphorous acid aryl est Process for the preparation of neutral phosphorous acid aryl est

1980-12-04

1982-10-26

Sutto, Anton H.

Chemistry of carbon compounds

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

260976, C07F 9141

Patent

active

043561292

ABSTRACT:
A process for the preparation of a neutal phosphorous acid aryl ester of the general formula ##STR1## wherein a phosphorus trihalide, phosphorus acid monoester dihalide or phosphorous acid diester halide is reacted with a hydroxyaryl compound wherein an excess of hydroxyaryl compound and an excess of aqueous alkali metal hydroxide solution or suspension or alkaline earth metal hydroxide solution or suspension are employed, relative to the phosphorus halide compound, an inert water immiscible organic solvent and/or diluent is employed in an amount such that 5 to 50% strength solution of the neutral phosphorous acid aryl ester is formed and after the reaction, the organic phase is separated off and the phosphorous acid aryl ester formed is isolated by removing the solvent and/or diluent.

REFERENCES:
patent: 2450903 (1948-10-01), Mikeska
patent: 3463838 (1969-08-01), Hensel et al.
patent: 3494986 (1970-02-01), Hechenbleikner
patent: 3689602 (1972-09-01), Ismail
patent: 4290977 (1981-09-01), Hucks et al.

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