Process for the manufacture of coumarin dyes
US4146712A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1977 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Feb 22, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the manufacture of coumarin dyes of the formula ##STR1## wherein Y represents a sulphur or an oxygen atom and the ring B can carry non-ionogenic substituents or substituted or unsubstituted fused rings, and A represents a hydrogen atom, a hydroxyl, alkoxy or phenoxy group, a nitrogen-containing heterocyclic ring system which is fused to two carbon atoms or represents a group --NR.sub.1 R.sub.2, in which R.sub.1 represents a substituted or unsubstituted alkyl or phenyl group, R.sub.2 represents a hydrogen atom or has one of the meanings assigned to R.sub.1, or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached represent a 5- or 6-membered ring system, which process comprises condensing heterocyclic products of the formula ##STR2## wherein R represents a --CN--, --COOR' or ##STR3## group, in which R' represents a substituted or unsubstituted alkyl or aryl group and each of R" and R'" independently can be the same as R' or a hydrogen atom, or together with the nitrogen atom to which they are attached form a heterocyclic 5- or 6-membered ring, and Y and B are as defined above, with the proviso that, if Y represents a sulphur atom, the reaction …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.