Methods for preparing eutectic mixtures of p-hydroxybenzoic acid

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

1980-10-23

1982-01-05

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

C07C 6988

Patent

active

043095640

ABSTRACT:
Novel methods of forming in situ eutectic mixtures of three or more lower alkyl esters of p-hydroxybenzoic acid are disclosed which avoid the prior art methods of forming the respective esters independently and blending them, for example, by melting. Such eutectic 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-hydroxybenzoic 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.

REFERENCES:
patent: 2350326 (1944-06-01), Du Vall et al.
patent: 3097131 (1963-07-01), Ueno et al.
patent: 3321509 (1967-05-01), Burris et al.

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