Process for producing 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl
US7772436B2 · kind B2 · utility
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Key dates
| Filing date | Nov 5, 2004 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Jun 23, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/54
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing 2,2′-bis (trifluoromethyl)-4,4′-diaminobiphenyl which is useful as a raw material for polyimide resin, etc.In benzidine rearrangement of 3,3′-bis(trifluoromethyl) hydrazobenzene in the presence of an inorganic acid such as sulfuric acid aqueous solution or concentrated hydrochloric acid, use of a water-immiscible organic solvent such as toluene as reaction solvent can increase the yield of the product.3,3′-bis(trifluoromethyl) hydrazobenzene can be synthesized by reduction of m-nitrobenzotrifluoride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.