Hydroquinone derivatives of pyridinecarboxylic acids
US4410702A · kind A · utility
2Cited by
0References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Sep 29, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are hydrogen or alkyl, X represents the atoms to complete an aromatic heterocyclic ring system and Y is hydrogen or has the meaning assigned to X, are readily cleaved in alkaline solutions to release a hydroquinone derivative. The compounds can be incorporated into photographic materials used for activation processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.