Process for the preparation of brominated pyrrolo-[3,4-c]-pyrrol

Details Process for the preparation of brominated pyrrolo-[3,4-c]-pyrrol Process for the preparation of brominated pyrrolo-[3,4-c]-pyrrol

1987-01-27

1989-03-07

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

G07D48704

Patent

active

048108022

ABSTRACT:
Process for the preparation of brominated pyrrolo-[3,4-c]pyrrole pigments by bromination of a pyrrolo-[3,4-c]-pyrrole or of a mixture of different pyrrolo-[3,4-c]-pyrroles of the formula I ##STR1## with an amount of a brominating agent which supplies 0.5 to 70 equivalents of bromine, with or without a solvent, and subsequent isolation of the brominated pyrrolo-[3,4-c]-pyrrole by removal of the excess brominating agent and, if appropriate, the solvent by customary methods.
The desired brominated pyrrolo-[3,4-c]pyrroles are obtained directly in a high yield by this process.
Reference is made to claim 1 in respect of the meaning of substituents A, B and Z.

REFERENCES:
patent: 3592947 (1971-07-01), Stein
patent: 4415685 (1983-11-01), Iqbal et al.
patent: 4490562 (1984-12-01), Schreiber et al.
patent: 4579949 (1986-04-01), Rochat et al.
patent: 4585878 (1986-04-01), Jost et al.
Glinzer & Fittig, Ann. 136, 301-303 (1865).
Hubner et al., Ann. 154, 293-303 (1870).
Chem. Abst., vol. 63, 8272 (1965).

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