Process for the manufacture of anthraquinone compounds
US4655970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1984 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Sep 19, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B1/51
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the manufacture of quaternized diaminoanthraquinones by reacting alpha-nitro-anthraquinone with an amine of the formula ##STR1## to give 1-aminoanthraquinone (B), halogenating, preferably brominating the compound (B) to give 1-amino-4-halogeno- or 1-amino-2,4-dihalogeno-anthraquinone (C), condensing the compound (C) with a diamine of the formula ##STR2## or with an amine of the formula HNR.sub.3 R.sub.7 to give 1,4-diaminoanthraquinone (D) and subsequently quaternizing compound (D) to give the corresponding quaternized anthraquinone compound (E) which process comprises carrying out the condensation of compound (C) with the amine to form compound (D) and subsequent quaternization steps in one single operation without isolation of the intermediate (D).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.