Process for producing bismethine isoindolines

Details Process for producing bismethine isoindolines Process for producing bismethine isoindolines

1983-09-23

1985-02-19

Berch, Mark L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548482, 548473, 548455, 548330, 548159, 548217, 544284, C09B 5704

Patent

active

045007187

ABSTRACT:
A process for producing bismethine isoindolines of the formula ##STR1## in which process the condensation of 1 mol of any one of the compounds of the formulae ##STR2## with 2 mols of a cyanomethylene compound of the formula NC--CH.sub.2 --R.sub.1 or NC--CH.sub.2 --R.sub.2, or with 1 mol of a cyanomethylene compound of the formula NC--CH.sub.2 --R.sub.1 and 1 mol of a cyanomethylene compound of the formula NC--CH.sub.2 --R.sub.2, wherein the symbols have the meanings defined in the specification, is performed in a polar solvent in the presence of a strong base, and the bismethine isoindoline obtained is isolated from the reaction mixture by hydrolysis.
The bismethine isoindolines are suitable for pigmenting high-molecular organic material, particularly lacquers.

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Flitsch et al., "Tautomerism 2,5 Disubstituted Pyrroles," Chem. Ber. 111(6), 2401-2406, (1978).
Foucaud, et al., "Pyrrolidinones, . . . " Bull. Soc. Chim. Fr. (12) (1968), pp. 4967-4970.
Gompper, et al., "Dehydropyrrolium Salts . . . ," Tetrahedron Letters, 21 (32), 2883-2886, (1980).
Barrett, et al., "Phthalocyanines and Related Compounds" J. Chem. Soc. (1940), pp. 1076-1090.

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