Methods for preparing eutectic mixtures of p- hydroxybenzoic...

Details Methods for preparing eutectic mixtures of p- hydroxybenzoic... Methods for preparing eutectic mixtures of p- hydroxybenzoic...

C - Chemistry, Metallurgy

07

C

260/475.3

C07C 69/88 (2006.01)

Patent

CA 1171878

METHODS FOR PREPARING EUTECTIC MIXTURES OF p-HYDROXYBENZOIC ACID ESTERS Abstract of the Disclosure Novel methods of forming in situ eutectic mix- tures of three or more lower alkyl esters of p-hydroxy- benzoic acid are disclosed which avoid the prior art methods of forming the respective esters independently and blending them, for example, by melting. Such eutec- tic mixtures may be formed in situ by first reacting a p-hydroxybenzoic acid and a lower alkanol in the presence of an esterification catalyst to form a first lower alkyl ester of p-hydroxybenzoic acid, reacting the resulting mixture with two or more lower alkanols under heat to form a mixture of three or more lower alkyl esters of p-hydroxybenzoic acid, quenching the reaction when the ratio of the respective lower alkyl esters of p-hydroxy- benzoic acid to each other is such that the mixture thereof is liquid at room temperature and isolating the resulting eutectic mixture. Other methods of preparing such eutectic mixtures in situ are also disclosed.

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