Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Preparation of DI-OR triarylmethane dyes by oxidation
 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, tetraaza14!annulenes, phthalocyanines or tetraazacyclotetradecanes. 
BASF Aktiengesellschaft
C C
C09B C09B
inventional inventional
Udo Thomas
Mayer Gessner