Process for producing 2-methoxybenzanthrones
US4414156A · kind A · utility
1Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1981 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Oct 9, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B3/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a novel process for producing 2-methoxybenzanthrones, starting with 1-aminoanthraquinones, which process is characterized in that, by application of a special reaction medium, namely a dimethylalkanephosphonate, which at the same time acts as a methylation agent in one of the reaction steps, the reaction is performed from beginning to end according to the principle of the single-vessel reaction, that is to say, without isolation of intermediates. The 2-methoxybenzanthrones obtained by this process are important intermediate products for vat dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.