Process for dienoic condensation known as the diels-alder reaction
US5892124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Dec 29, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07B37/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Improved process for implementing the Diels-Alder reaction that consists in using reagents in the presence of at least one liquid salt of general formula Q.sup.+ A.sup.-, in which Q.sup.+ represents a quaternary ammonium and/or phosphonium and A.sup.- represents an anion and optionally at least one Lewis acid. The anion is preferably selected from the group that is formed by tetrafluoroborate, hexafluorophosphate, hexafluoroantimonate, hexafluoroarsenate, perfluoroalkylsulfonate, fluorosulfonate or else dichlorocuprate, tetrachloroborate, tetrachloroaluminate, and trichlorozincate. At the end of the reaction, the organic phase is separated, and the polar phase is reused.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.