Process for the preparation of the enol lactone of 2-oxocyclohexlidene acetic acid and application to the preparation of 2-cuomaranone
US5773632A · kind A · utility
1Cited by
1References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1997 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Jun 26, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/83
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of the enol lactone of 2-oxocyclohexylidene acetic acid wherein PA1 (i) glyoxylic acid is allowed to react with cyclohexanone in the presence of a halogen acid in order to obtain a crude reaction product B1, then PA1 (ii) said crude reaction product B1 is allowed to react, after solubilisation in an organic solvent, in the presence of a strong acid soluble in said organic solvent or of strongly acid resins, in order to obtain the enol lactone of 2-oxocyclohexylidene acetic acid which is isolated if desired, and application to the preparation of 2-coumaranone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.