Lithium/HMPA-promoted synthesis of poly(phenylenes)
US5338823A · kind A · utility
2Cited by
1References
8Claims
0Family size
Inventors
Key dates
| Filing date | Dec 7, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Dec 7, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2261/312
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Poly(phenylene) that is substantially free of insoluble material is prepared by the polymerization of a lithioarylhalide compound in the presence of a polar aprotic compound such as hexamethylphosphoramide, N,N,N',N'-tetramethylethylenediamine or hexamethylphosphorous triamide. The preferred reaction involves the polymerization of 1-bromo-4-lithiobenzene in the presence of hexamethylphosphoramide. The 1-bromo-4-lithiobenzene may be synthesized by reacting 1,4-dibromobenzene with t-butyllithium. These same types of reactions can also be used to synthesis other benzenoid polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.