Process for the preparation of 2-carboxyalkyl(aryl)phosphinic acid and corresponding anhydride(s)
US6399814B1 · kind B1 · utility
1Cited by
4References
15Claims
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Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/301
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved hydrolysis process comprising a process for the preparation of 2-carboxyalkyl(aryl)phosphinic acid using a controlled addition of water to an acrylation reaction mixture, and control of the temperature. Preparation of 2-carboxyalkyl(aryl)phosphinic acid cyclic anhydride is disclosed using a controlled addition of water, wherein up to about one mole of water per mole of dichloro(aryl)-phosphine charged to the acrylation reaction is added, and temperature is controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.