Method for preparing hydroxyphenyl carboxylic acid esters

Details Method for preparing hydroxyphenyl carboxylic acid esters Method for preparing hydroxyphenyl carboxylic acid esters

2005-04-12

2005-04-12

Desai, Rita (Department: 1625)

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

Organic compounds

Carboxylic acid esters

C560S076000, C560S067000

Reexamination Certificate

active

06878843

ABSTRACT:
A process for the preparation of a compound of formula (I)whereinR1and R2are each independently of the other C1-C8alkyl, cyclopentyl or cyclohexyl,m is 1, 2 or 3, preferably 2,n is an integer from 1 to 30, andR3is an n-valent radical from linear or branched C4-C30alkyl, which is optionally interrupted by one or more oxygen atoms, or (when n=1-12) an n-valent radical from C5-C12cycloalkyl, or a radical R4—[NR5—CmH2m—]p,R4is hydrogen, an n-valent radical from linear or branched C4-C30alkyl, which is optionally interrupted by one or more —NR5— groups, or (when n=1-12) an n-valent radical from C5-C12cycloalkyl,R5radicals, each independently of any other(s), are hydrogen or methyl or —CmH2m—, preferably hydrogen, andp corresponds to the number of —[NR5—CmH2m—] groups that gives n —CmH2m— radicals per molecule,by reaction of a compound of formula (II)wherein R is C1-C3alkyl,with a compound of formula (III)in-line-formulae description="In-line Formulae" end="lead"?R3(OH)n  (III)in-line-formulae description="In-line Formulae" end="tail"?wherein R3and n have the definitions given, wherein the reaction takes place at a practically neutral acid value (pH) and in the presence of at least one alkali metal salt of an organic carboxylic acid, which salt is dissolved or suspended in the reaction mixture, or in the presence of a mixture of such alkali metal salts, (i) that alkali metal salt being formed from an alkali metal cation and an anion of an organic carboxylic acid and (ii) the organic carboxylic acid being at least partially volatile under the reaction conditions applied. Preferred alkali metal salts are alkali metal formate and alkali metal acetate.

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