Process for preparing malonic acid and alkylmalonic acids
US5886219A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 1998 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Feb 6, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/09
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Malonic acid and alkylmalonic acids are prepared by a process of acid-catalyzed saponification of malonic acid esters, which comprises: PA1 contacting an aqueous mixture of the ester II with an acid ion exchanger containing sulfonic acid groups at from 30.degree.-100.degree. C. and from 40-1000 mbar according to the following scheme: ##STR1## where R.sup.1 =H, CH.sub.3, PA1 R.sup.2 =H, CH.sub.3 or PA1 R.sup.1 +R.sup.2 =--CH.sub.2 --CH.sub.2 --and PA1 R.sup.3 =CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7, C(CH.sub.3).sub.3 ; distilling off the alcohol R.sup.3 OH which is formed; PA1 separating the water, with the aid of organic solvents, from the malonic acid or alkylmalonic acid product; and then PA1 isolating the product by crystallization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.