Process for the preparation of triphendioxazine dyestuffs amidat

Details Process for the preparation of triphendioxazine dyestuffs amidat Process for the preparation of triphendioxazine dyestuffs amidat

1996-11-08

1997-12-09

Datlow, Philip I.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544 77, C07D49804

Patent

active

056962584

ABSTRACT:
According to the invention, a process for the preparation of triphendioxazines symmetrically or asymmetrically amidated on both sides comprises reducing a triphendioxazine chromophore, which is optionally already amidated on one side, to give the leuco form and amidating and re-oxidizing the leuco form. Products amidated on both sides are obtained in this manner with a high yield and product quality. Novel triphendioxazine dyestuffs are furthermore prepared in this manner.

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Nishi et al Bulletin of the Chemical Society of Japan, Bd. 56, Nr. 5, May 1983, Tokyo Japan, pp. 1482-1486 XP002026132.

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