Preparation of thiophenes
US4447624A · kind A · utility
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5Claims
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Assignee
Inventors
Key dates
| Filing date | Jun 21, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Jun 21, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D333/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of thiophenes having the structure ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be various substituents. The compounds can be converted to the corresponding 2-amino compounds from which azo dyes can be prepared.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.