Process for preparing triphendioxazine compounds

Details Process for preparing triphendioxazine compounds Process for preparing triphendioxazine compounds

1988-06-06

1989-07-04

Raymond, Richard L.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544 75, 544 77, C07D49804

Patent

active

048452130

ABSTRACT:
A novel, simple process for preparing triphendioxazines by oxidative cyclization of 2,5-diarylaminobenzoquinones in sulphuric acid which, if necessary, contains sulphur trioxide consists in using as an oxidizing agent chlorine, bromine or an inorganic bromine compound.

REFERENCES:
patent: 4532323 (1985-07-01), Jager
patent: 4628086 (1986-12-01), Franke

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