Process for preparing 4,6-dinitroresorcinol
US4745232A · kind A · utility
6Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1987 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Jan 7, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C201/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of nitrating resorcinol which is selective for the production of the 4,6-dinitro resorcinal isomer. A resorcinol-based starting material is admixed with a nitrating solution from which substantially all nitrogen dioxide and nitrous has been removed. The nitrating solution contains white fuming nitric acid, a nitrosonium ion control agent such as urea, and, optionally, concentrated sulfuric acid. The 4,6-dinitroresorcinal isomer is provided in yields of about 65-85% with minimal production of undesirable side products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.