Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1987-01-12
1988-10-18
Hollrah, Glennon H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
546271, C07D48704
Patent
active
047788992
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 is 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:
patent: 4490542 (1984-12-01), Iqbal et al.
patent: 4579949 (1986-04-01), Rochat et al.
patent: 4613669 (1986-09-01), Cassar et al.
D. G. Farnum et al., Tetrahedron Letters 29, 2549 (1974).
Iqbal Abul
Pfenninger Johannes
Rochat Alain C.
Wallquist Olof
Ciba-Geigy Corporation
Hall Luther A. R.
Hollrah Glennon H.
Springer D. B.
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