Oblon, Spivak, McClelland, Maier & Neustadt
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 or of a catalyst based on molybdenic acid and vanadium compounds comprises using as oxidizing agent peroxomonosulfuric acid or a salt thereof. 
BASF Aktiengesellschaft
C C
C09B C09B
inventional inventional
Thomas Udo
Gessner Mayer