Preparation of Di- or triarylmethane dyes by oxidation
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United States of America Patent
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Aug 19, 1997
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N/A
app pub date -
Mar 13, 1996
filing date -
Apr 8, 1992
priority date (Note) -
Expired
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Abstract
A process for preparing di- or triarylmethane dyes by oxidation of di- or triarylmethanes in the presence of a diluent and of an oxygen transfer catalyst that contains a complexed heavy metal ion comprises using as oxidizing agent hydrogen peroxide, a hydrogen peroxide donor compound, an organic hydroperoxide or a percarboxylic acid and as the oxygen transfer catalyst a member of the class of the porphyrins, tetraaza[14]annulenes, phthalocyanines or tetraazacyclotetradecanes.
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