Preparation process of cinnamic acids

Details Preparation process of cinnamic acids Preparation process of cinnamic acids

C - Chemistry, Metallurgy

07

C

260/515.1

C07C 51/09 (2006.01) C07C 57/42 (2006.01) C07C 59/40 (2006.01)

Patent

CA 1292997

- 25 - 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.

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