Process for the preparation of pyrrolo[3,4-c]pyrroles, and novel

Details Process for the preparation of pyrrolo[3,4-c]pyrroles, and novel Process for the preparation of pyrrolo[3,4-c]pyrroles, and novel

1985-11-01

1987-04-21

Jacobs, Lewis T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C08K 534

Patent

active

046597751

ABSTRACT:
The invention relates to a process for the preparation of pyrrolo[3,4-c]pyrroles of formula (1) ##STR1## wherein each of R.sub.1 and R.sub.2 independently of the other is an alkyl or aralkyl group or an isocyclic or heterocyclic aromatic radical, which process comprises reacting an ester of formula (2) or (3) ##STR2## with a nitrile of the formula R.sub.2 CN, in which formulae each of R and R' independently of the other is an alkyl or aryl group, and R.sub.1 and R.sub.2 are as defined above, in the presence of a strong base in an organic solvent.
The invention also relates to compounds of formula (8) ##STR3## wherein R.sub.3 in an alkyl or aralkyl group or an ortho-substituted isocyclic or heterocyclic aromatic radical and R.sub.4 is an alkyl or aralkyl group or an isocyclic or heterocyclic aromatic radical.
The pyrrolopyrroles obtained are valuable pigments for coloring compounds of high molecular weight such as plastics and lacquers in yellow to red shades of excellent fastness properties.

REFERENCES:
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patent: 4579949 (1986-04-01), Rochat et al.
patent: 4585878 (1986-04-01), Jost et al.
CA, 100, 87260q (1984).
M. Pohmakotr et al., Chem. Letters, 1982, 687.
Chemtech, Feb. 1980, p. 111, Table 1
C. A. Grob, Synthetische Methoden der Organischen Chemie, p. 97, (1954).
Ullmanns Encyclopadie der Technischen Chemie, vol. 12, p. 763 (1960).
D. G. Farnum et al., Tetrahedron Letters, No. 29, 2549 (1974).
T. Hiyama et al., Tetrahedron Letters, 23, 1597 (1982).

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