Process for the preparation of indigo compounds
US4966977A · kind A · utility
3Cited by
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16Claims
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Key dates
| Filing date | Mar 16, 1989 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Mar 16, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B7/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of an indigo compound by reacting an indole compound having no substituent at the 2- and 3-positions with hydrogen peroxide in a liquid phase composed of at least two separate phases including an organic phase containing the indole compound and an aqueous phase containing hydrogen peroxide, or by reacting the indole compound with hydrogen peroxide in solution in an organic solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.