Process for the preparation of aryloxyacetic acid
US4935540A · kind A · utility
Inventor
Key dates
| Filing date | Dec 12, 1988 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Dec 12, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/255
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of an aryloxyacetic acid by oxidation of aryloxyethanol of the formula: ##STR1## wherein m represents 1 or 2, PA0 n represents the numeral which results from the difference between 6 and m and R either individually or independently of one another represents hydrogen, alkyl, cycloalkyl, aryl, aralkyl, alkoxy, cycloalkoxy, aryloxy, halogen, alkylcarbonyl, arylcarbonyl, carboxyl or nitro, or represents a benzene ring fused to the phenyl ring, in an aqueous alkaline reaction medium at a temperature in the range of 0.degree. C. to the boiling point of the reaction medium in the presence of a catalytic amount of a catalyst comprised of palladium, thallium and carbon to form the corresponding alkali metal ester and contacting the alkali metal ester with a mineral acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.