Preparation process of cinnamic acids

Details Preparation process of cinnamic acids Preparation process of cinnamic acids

1987-02-20

1989-02-21

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 6364

Patent

active

048066834

ABSTRACT:
A process is disclosed which prepares a cinnamic acid from a cinnamate ester by starting the hydrolysis reaction of the cinnamate ester with an alkali by use of water as a solvent in a heterogeneous binary-phase liquid system to obtain an aqueous alkaline solution of an alkali cinnamate and precipitating the cinnamic acid by conducting an acidifying reaction of said aqueous alkaline solution with a mineral acid so as to keep a pH value of not more than 4 in a resulting liquid.

REFERENCES:
patent: 3783140 (1974-01-01), Heck
patent: 3922299 (1975-11-01), Heck
Organic Reactions, vol. 1 (1942), p. 217.

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