Process for producing bismethine isoindolines

Details Process for producing bismethine isoindolines Process for producing bismethine isoindolines

1982-03-29

1984-01-17

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548473, 548482, 548455, 106288Q, 544284, 548330, 548159, 548217, C09B 5704

Patent

active

044265336

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.

REFERENCES:
patent: 3390149 (1968-06-01), Kranz et al.
patent: 3646033 (1972-02-01), Leister et al.
patent: 3758497 (1973-09-01), Pugin et al.
Barrett et al., "Phthalocyanines and Related Compounds . . . ", J. Chem. Soc., (1940), pp. 1076-1078.
F. Baumann et al., Angew. Chem., 68, 133, (1956).

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