Preparation of 1-amino-2-chloro-4-hydroxyanthraquinone
US5180841A · kind A · utility
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Key dates
| Filing date | Jan 22, 1992 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Jan 22, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C225/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The useful dye intermediate 1-amino-2-chloro-4-hydroxyanthraquinone is prepared by chlorinating 1-amino-4-hydroxy-2,3-dihydroanthraquinone with chlorine in concentrated sulfuric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.