Process for preparing ethylenedialkylphosphinic acids, esters and salts by means of acetylene and use thereof

US9181487B2 · kind B2 · utility

Assignee

• Clariant Finance (BVI) Limited · VG

Inventors

• Michael Hill · Barry, GB
• Werner Krause · Plantsville, US
• Martin Sicken · Cologne, DE

Key dates

• Filing date: Dec 15, 2009
• Grant date: Nov 10, 2015
• Expiry date: Dec 15, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/5313
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing ethylenedialkylphosphinic acids, ethylenedialkylphosphinic esters and ethylenedialkylphosphinic salts, wherein a) a phosphinic acid source (I) is reacted with olefins (IV) in the presence of a catalyst A to give an alkylphosphonous acid, its salt or ester (II), b) the resultant alkylphosphonous acid, its salt or ester (II) is reacted with an acetylenic compound (V) in the presence of a catalyst B, to give the ethylenedialkylphosphinic acid derivative (III), and the catalyst A comprises transition metals, 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 comprises peroxide-forming compounds, peroxo compounds and/or azo compounds.