Process for the preparation of indigo compounds
US5112987A · kind A · utility
1Cited by
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28Claims
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Key dates
| Filing date | Oct 25, 1989 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Oct 25, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B7/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of an indigo compound which comprises reacting a corresponding indole compound having no substituent at the 2- and 3-positions with a percarboxylic acid in the presence of an alcohol solvent, or with heating over 60.degree. C. in the presence of an aprotic solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.