Process for the production of 6,13-dihydroquinacridones and appa

Details Process for the production of 6,13-dihydroquinacridones and appa Process for the production of 6,13-dihydroquinacridones and appa

1994-11-16

1997-03-11

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 56, C07D47104, C09B 4800

Patent

active

056103069

ABSTRACT:
A process for producing highly pure 6,13-dihydroquinacridone, which is a suitable intermediate for effectively producing a quinacridone pigment, for a short period of time at high yields, the process comprising providing a cylindrical reactor, providing an atmosphere free of oxygen in the cylindrical reactor, heating the cylindrical reactor so that the temperature of at least a surface of an inner wall of a cylinder of the cylindrical reactor is in the range of from 250.degree. to 400.degree. C., introducing a powder of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester or a mixture of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester with a liquid through a feed port provided in an upper portion of the cylindrical reactor, keeping the powder or the mixture in substantial contact with the inner wall of the cylindrical reactor so that an intramolecular alcohol-elimination reaction of the 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester takes place to form 6,13-dihydroquinacridone, and taking out the 6,13-dihydroquinacridone through an outlet provided in a lower portion of the cylindrical reactor.

REFERENCES:
patent: 2821529 (1958-01-01), Struve
patent: 2821530 (1958-01-01), Struve
patent: 3024239 (1962-03-01), Caliezi
patent: 3357477 (1967-12-01), Monty
patent: 3357479 (1967-12-01), Baird et al.
patent: 3433790 (1969-03-01), Adachi
patent: 3738988 (1973-06-01), Jackson
patent: 4544746 (1985-10-01), Holtje
patent: 4758664 (1988-07-01), Spietschka et al.
patent: 4812568 (1989-03-01), Herzog et al.
patent: 4956464 (1990-09-01), Bender et al.
patent: 5093497 (1992-03-01), Schutze et al.
patent: 5318626 (1994-06-01), Maki
Ube Industries KK, Database WPI, Week 821S, Derwent Publications Ltd., London GB AN82-29928 JP-A-57040562 Mar. 1982.

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