Process for producing bismethine isoindolines
US4426533A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Mar 29, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.