Coumarin and coumarinimide derivatives
US3954743A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1973 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Jul 9, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of the formula ##SPC1## In which PA0 X signifies oxygen or =NH, PA0 R.sub.1 signifies an alkyl, alkenyl or phenyl radical which is unsubstituted or substituted, PA0 R.sub.2 signifies hydrogen or one of the meanings of R.sub.1 or PA0 R.sub.1 and R.sub.2 together with the vicinal nitrogen atom form a heterocyclic ring system, PA0 R.sub.3 signifies hydrogen, acyl or an alkyl or phenyl radical which is unsubstituted or substituted, and PA0 R.sub.4 signifies the atoms needed to complete an aromatic carbocyclic or heterocyclic ring system, PA0 And the ring A and chain R.sub.4 are unsubstituted or substituted, Are useful fluorescent dispersion dyestuffs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.