Process for the production of 2,5-di(arylamino)-3,6-dihydroterep

Details Process for the production of 2,5-di(arylamino)-3,6-dihydroterep Process for the production of 2,5-di(arylamino)-3,6-dihydroterep

1997-04-29

1998-10-06

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 49, C09B 4800

Patent

active

058178171

ABSTRACT:
A process for producing 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester having a high purity from 1,4-cyclohexanedione-2,5-di(carboxylic acid alkyl ester) at high yields for a short period of time; a process for producing quinacridone of which the byproduct content is small, from the above 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester; and a process for producing quinacridone of which the particle diameter is adjusted as desired, from the above 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester without adding a step of forming a pigment.

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