Substituted -6,7,8,9-tetrahydro-pyrido- and 2H-pyrano [2,3-b][1,8]naphthyridines, stable efficient laser dyes
US4202981A · kind A · utility
2Cited by
1References
5Claims
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Key dates
| Filing date | Mar 20, 1978 |
| Grant date | May 13, 1980 |
| Priority date | — |
| Expiry date | Mar 20, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/213
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds having the formula: ##STR1## wherein X is selected from the group consisting of NH and O, R is selected from the group consisting of H, CH.sub.3 and phenyl, R' is selected from the group consisting of OCH.sub.3, CF.sub.3 CH.sub.3 and H and R" is selected from the group consisting of H, CH.sub.3 and CH.sub.2 CO.sub.2 C.sub.2 H.sub.5. The compounds are stable, efficient laser dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.