Process for the manufacture of a violet organic pigment, C.I. Pi

Details Process for the manufacture of a violet organic pigment, C.I. Pi Process for the manufacture of a violet organic pigment, C.I. Pi

1981-03-16

1982-08-17

Jiles, Henry R.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D26534

Patent

active

043450741

ABSTRACT:
In the process for the manufacture of the organic pigment of the formula ##STR1## by condensing and cyclizing 3-amino-9-ethylcarbazole with excess tetrachlorobenzoquinone in an organic solvent in the presence of acid acceptors, the improvement comprises carrying out the condensation reaction in the presence of 0.1 to 4% of water, relative to the total weight of the reaction mixture.

REFERENCES:
Venkataraman, The Chemistry of Synthetic Dyes, vol. II, (1952), pp. 786 and 787.
BIOS Final Report No. 960--p. 75--German Dyestuffs and Dyestuffs Intermediates.

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