Process for the purification of 9,9-bis(4-hydroxyphenyl)-fluorene
US4024194A · kind A · utility
8Cited by
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2Claims
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Inventor
Key dates
| Filing date | Mar 16, 1976 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Mar 16, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2603/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Certain impurities found in 9,9-bis(4-hydroxyphenyl)-fluorene are removed by treatment of the latter with nitromethane in which the impurity is soluble, and thereafter isolating the purified fluorene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.