Preparation of 2-phenylethylene phosphonic acid

Details Preparation of 2-phenylethylene phosphonic acid Preparation of 2-phenylethylene phosphonic acid

1981-03-04

1982-04-13

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 938

Patent

active

043247407

ABSTRACT:
This invention is directed to an improved process for preparing 2-phenylethylene phosphonic acid by reacting styrene and PCl.sub.5 in an inert organic solvent and hydrolyzing the reaction product formed, wherein the improvement comprises forming a mixture of styrene and PCl.sub.5 in a molar ratio of about 1:1 at a temperature of from 60.degree. to 70.degree. C. in an inert organic solvent having a boiling point above 70.degree. C.; maintaining the mixture at a temperature of from 60.degree. to 70.degree. C. with evolution of HCl gas until a clear solution forms; distilling off the solvent under vacuum; hydrolyzing the remaining reaction mixture in water at temperatures not exceeding 70.degree. C. and cooling the hydrolyzed mixture to cause crystals of 2-phenylethylene phosphonic acid to precipitate; and recovering said crystals.

REFERENCES:
patent: 2685602 (1954-08-01), Woodstock et al.
patent: 3763122 (1973-10-01), Effers
patent: 3931294 (1976-01-01), Auel et al.
Kosolapoff et al., "J. Am. Chem. Soc.," vol. 68, (12/1946), pp. 2540-2541.
Pudovik et al., "Russian Chemical Reviews", 37(5) 1968, pp. 317-332.

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