Preparation of cyclic carbonates using alkylammonium and tertiary amine catalysts
US5091543A · kind A · utility
25Cited by
15References
31Claims
0Family size
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Inventor
Key dates
| Filing date | Oct 15, 1990 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Oct 15, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D317/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of preparing five- and six-membered cyclic carbonates is disclosed. The process comprises reacting a 1,2- or 1,3-diol with an acyclic diester of carbonic acid in the presence of a catalyst selected from alkylammonium salts, tertiary amines, and ion-exchange resins containing alkylammonium or tertiary amino groups. Cyclic carbonates free of polycarbonate by-products are obtained in high yields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.