Bis(functionally-substituted phenylene) semi-rigid crowns and process for making
US5028721A · kind A · utility
2Cited by
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6Claims
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Key dates
| Filing date | Oct 6, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Oct 6, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Bis(carboalkoxy-substituted phenylene)-32-crown-10 compounds, useful as polymerizable monomers, can be formed by first reacting a functionalized dihydroxy aromatic compound with a hydroxy protecting group-substituted halopolyether, deprotecting the resulting product to form the diol, forming the corresponding tosylate, and reacting the tosylate with the same or analogous diol in a cyclization reaction to form the crown ether compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.