Benzanthrone lactones
US4740604A · kind A · utility
3Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1987 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | May 15, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B29/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are disclosed benzanthrone lactones of formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined in claim 1. The benzanthrone lactones of formula (1) are important intermediates for the synthesis of novel dyes which are obtained by coupling suitable diazo components to said compounds of formula (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.