Process for making hydroxy-substituted ethynylated biphenyl compounds
US5959157A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1996 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jun 14, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for making ethynylated, hydroxy-substituted biphenyl compounds comprising: PA1 a) halogenating 3,3'-dimethoxybiphenyl to form 2,2'-dihalo-5,5'-dimethoxybiphenyl; PA1 b) reacting the resulting 2,2'-dihalo-5,5'-dimethoxybiphenyl with a bromide-containing compound in a chlorinated solvent to form 2,2'-dihalo-5,5'-dihydroxybiphenyl; PA1 c) reacting the resulting 2,2'-dihalo-5,5'-dihydroxybiphenyl with a hydroxyl-containing compound in the presence of a protection catalyst to form 2,2'-dihalo-5,5'-bis(tetrahydropyranoxy)biphenyl; PA1 d) ethynylating the resulting 2,2'-dihalo-5,5'-bis(tetrahydropyranoxy)biphenyl with a compound of the formula EQU CuC.tbd.CR' wherein R' is comprised of an alkyl group having from about 1 to about 20 carbon atoms, an alkenyl group having from about 1 to about 20 carbon atoms, an aryl group, a heteroaryl group, or mixtures thereof to form 2,2'-bis(C.tbd.CR')-5,5'-bis(tetrahydropyranoxy)biphenyl; and PA1 e) hydrolyzing the resulting 2,2'-bis(C.tbd.CR')-5,5'-bis(tetrahydropyranoxy) biphenyl to form 2,2'-bis(C.tbd.CR')-5,5'bis(dihydroxy)biphenyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.