Process for the preparation of indigo compounds
US4992556A · kind A · utility
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27Claims
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Key dates
| Filing date | Feb 23, 1989 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Feb 23, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B7/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An indigo compound is prepared by reacting an indole compound unsubstituted at the 2- and 3-positions with an organic hydroperoxide, preferably in the presence of a metallic compound catalyst capable of catalyzing the oxidation of the carton atom at the 3-position of the indole compound, such as a compound of a metal of group 4A, 5A or 6A of the periodic table.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.