2-[(3-Indolyl)carbonyl]-4/5-carboxybenzoic acids
US4351768A · kind A · utility
4Cited by
3References
2Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 14, 1980 |
| Grant date | Sep 28, 1982 |
| Priority date | — |
| Expiry date | Mar 14, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D209/86
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
3-Aryl-3-indolylphthalides, 3-aryl-3-pyrrolylphthalides and 3-aryl-3-carbazolylphthalides prepared by interaction of the appropriate 2-(heteroaryl)carbonylbenzoic acid and the appropriate phenylamine, and 3,3-bis(indolyl)phthalides prepared by the interaction of the appropriate 2-(indolyl)carbonylbenzoic acid and the appropriate indole are useful as color formers in pressure-sensitive carbonless duplicating systems, thermal marking systems and hectographic copying systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.