Process for the preparation of benzothioxanthene dyestuffs

Details Process for the preparation of benzothioxanthene dyestuffs Process for the preparation of benzothioxanthene dyestuffs

1991-12-12

1994-01-18

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

564426, 564430, 564440, C07D33504, C07D33510

Patent

active

052801284

ABSTRACT:
The present invention relates to a process for the preparation of benzothioxanthene dyestuffs and cyclisation of 3-(2'-aminophenylthio)-benzanathrones wherein the diazotisation and cyclisation are carried out simultaneously in polar, aprotic solvent in the presence of water.

REFERENCES:
patent: 3828072 (1974-08-01), Spietschka et al.
patent: 3829434 (1974-08-01), Spietschka et al.
patent: 4740604 (1988-04-01), Weis et al.
patent: 4863482 (1989-09-01), Junino et al.
Patent Abstracts of Japan, vol. 10, No. 355 of JP-A-61 155 465, "Benzo(Thio)Xanthene Compound and Liquid Crystal Compound Containing Same", Nov. 29, 1986.
Carlini et al., Dyes and Pigments, vol. 3, No. 1, "New Daylight Fluorescent Pigments", pp. 59-69 (1982).
Houben-Weyl, "Methoden der Organischen Chemie", vol. VI/1c, p. 247 (1976).
"Ullmann's Encyclopedia of Industrial Chemistry", vol. V, p. 812 (1954).
Hoechst, "Din-Sicherhertsdolenblatt", (Jun. 1, 1989).

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