Process for producing 1-aminoanthraquinones
US5149848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Apr 8, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C225/34
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing 1-aminoanthraquinones represented by the formula (C) ##STR1## wherein R.sup.1 and R.sup.2, independently from each other, denote one type selected from a hydrogen atom, an alkyl group having 1 to 4 carbon atoms and a halogen atom, which comprises converting 5-nitro-1,4,4a,9a-tetrahydroanthraquinones respresented by formula (A) ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, into 1-hydroxylaminoanthraquinones represented by formula (B) ##STR3## wherein R.sup.1 and R.sup.2 are as defined above, in the presence of a basic compound, and electrolytically reducing the resulting 1-hydroxylaminoanthraquinones in the presence of a basic compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.