Process for the preparation of monohydrated sodium phenylpyruvat

Details Process for the preparation of monohydrated sodium phenylpyruvat Process for the preparation of monohydrated sodium phenylpyruvat

1994-01-24

1994-11-01

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 5974

Patent

active

053609271

ABSTRACT:
A process for the preparation of monohydrated sodium phenylpyruvate comprises reacting benzaldehyde with the stoichiometric quantity of hydantoin in the aqueous medium in the presence of a catalytic quantity of a primary or secondary amine at high temperature, treating the reaction mixture with an excess of sodium hydroxide at high temperature, adding sodium chloride to the sodium hydroxide-treated solution, acidifying the so obtained solution with concentrated hydrochloric acid, and washing the formed precipitate with methanol.

REFERENCES:
patent: 4152352 (1979-05-01), Perron
patent: 4351952 (1982-09-01), Foa
patent: 4492798 (1985-01-01), Lee
patent: 4518800 (1985-05-01), Schouteeten
patent: 4689431 (1987-08-01), Tanaka
Herbst, R. M. et al. Org. Syn. Coll. 3 1943, pp. 519-520.

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