Preparation of diaryl sulfones
US4822916A · kind A · utility
3Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1987 |
| Grant date | Apr 18, 1989 |
| Priority date | — |
| Expiry date | Sep 21, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C315/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Diaryl sulfones are formed in a two-stage procedure. The first involves the reaction of an aryl sulfonic acid with an aryl reagent containing active hydrogen while by-product water is removed azeotropically. In the second stage, which contains unreacted sulfonic acid, is treated with a sulfone condensing agent and additional aryl reagent to react additional, unreacted aryl sulfonic acid from the first stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.