Derivatives of 2,5-dihydroxyphenylcarboxylic acid

Details Derivatives of 2,5-dihydroxyphenylcarboxylic acid Derivatives of 2,5-dihydroxyphenylcarboxylic acid

1995-05-18

1997-06-10

Venkat, Jyothsna

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

Organic compounds

Carboxylic acid esters

424401, C07C 6976

Patent

active

056377568

ABSTRACT:
A cosmetic or dermatological composition with a depigmenting action comprises derivatives of 2,5-dihydroxyphenylcarboxylic acids, their homologs, and their salts, with the derivatives having the following structural formula: ##STR1## wherein: R.sub.1 represents OR.sub.5, OH, or ##STR2## R.sub.5 is a linear or branched C.sub.1 -C.sub.20 alkyl radical, a linear or branched C.sub.2 -C.sub.20 alkenyl radical, or a C.sub.1 -C.sub.20 alkyl radical substituted by one or more hydroxy or alkoxy groups; r' and r", identical or different, represent a hydrogen atom, a C.sub.1 -C.sub.20 alkyl radical, a C.sub.2 -C.sub.6 hydroxyalkyl radical, or a C.sub.3 -C.sub.6 polyhydroxyalkyl, or r' and r" taken together, with the nitrogen atom, form a heterocycle;

REFERENCES:
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patent: 4289495 (1981-09-01), Bugaut et al.
patent: 4484000 (1984-11-01), Howell
patent: 4526779 (1985-07-01), Hashimoto
patent: 4545984 (1985-10-01), Moller et al.
patent: 4835323 (1989-05-01), Howell

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