"Preparation of 4,4""-dihydroxyterphenyl"
US5008472A · kind A · utility
0Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1989 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Aug 31, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
4,4'-Dihydroxyterphenyl is prepared by sulfonating terphenyl with sulfuric acid, sulfur trioxide, a mixture thereof or chlorosulfonic acid and then treating the resulting terphenyl-4,4'-disulfonic acid, which may be first converted into a dialkali metal salt, with an alkali metal hydroxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.