Patent · US Expired

Preparation of Di- or triarylmethane dyes by oxidation

US5659053A · kind A · utility

11Cited by

1References

7Claims

0Family size

Assignee

BASF SE

Inventors

Thomas Gessner · Ypsilanti, US
Udo Mayer · Bischofswerda, DE

Key dates

Filing date	Mar 13, 1996
Grant date	Aug 19, 1997
Priority date	—
Expiry date	Mar 13, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B11/18
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.