Process for preparing mono-carboxy-functionalized dialkylphosphinic acids, esters and salts by means of alkylene oxides and use thereof
US9085734B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2009 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Oct 6, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/5313
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing mono-carboxy-functionalized dialkylphosphinic acids, dialkylphosphinic esters and dialkylphosphinic salts by means of alkylene oxides, characterized in that a) a phosphinic acid source (I) is reacted with olefins (IV) in the presence of a catalyst A to form an alkylphosphonous acid, its salt or ester (II), b) the resultant alkylphosphonous acid, its salt or ester (II) is reacted with alkylene oxides of the formula (V) in the presence of a catalyst B, to give a mono-functionalized dialkylphosphinic acid derivative (VI), and c) the resultant mono-functionalized dialkylphosphinic acid derivative (VI) is reacted in the presence of a catalyst C to give the mono-carboxy-functionalized dialkylphosphinic acid derivative (III), and the catalysts A and C are transition metals and/or transition-metal compounds and/or catalyst systems which are composed of a transition metal and/or a transition-metal compound and at least one ligand, and the catalyst B is a Lewis acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.