Dihydropyran derivatives, processes for preparation and use
US5157133A · kind A · utility
1Cited by
2References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1990 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Dec 3, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D309/30
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to dihydropyran derivatives, processes for preparing, and processes of using the derivatives. The derivatives are prepared by condensation of lithium dienolate of prenal with an aldehyde or a ketone. The pyran derivative prepared from .beta.-ionylideneacetaldehyde when treated in the presence of a catalyst directly forms retinal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.