Process for the preparation of carboxylic acids and derivatives of them
US5350872A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Oct 29, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C319/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The subject matter of the invention is a process for the preparation of carboxylic acids and derivatives of them of the general formula ##STR1## wherein R means hydrogen, or a C.sub.1-4 alkyl or a (C.sub.1-5 alkoxy)carbonyl group, PA1 R.sub.1 is as defined in claim 1, PA1 R.sub.7 stands for hydrogen or a C.sub.1-7 alkyl group and PA1 R.sub.8 means hydrogen or a carboxyl group, by reacting a 1,3-dioxane-4,6-dione derivative of the general formula ##STR2## wherein R.sub.9 stands for a C.sub.1-4 alkyl group or a phenyl group, optionally monosubstituted by halogen and PA1 R.sub.10 stands for hydrogen or a C.sub.1-5 alkyl group or PA1 R.sub.9 and R.sub.10 together form a pentamethylene group, and an aldehyde or ketone of the general formula ##STR3## in the presence of formic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.