Patent ID: 9181487
Filing Date: 2015-11-10
Classification: C07F,C08K,C09K

Abstract:
1. A process for preparing ethylenedialkylphosphinic acids, or salts or esters thereof comprising the steps of a) reacting a phosphinic acid source (I) with olefins IV in the presence of a catalyst A to give an alkylphosphonous acid (II), or salt or ester thereof, b) reacting the alkylphosphonous acid (II), or salt or ester thereof with at least one acetylenic compound (V) in the presence of at least one catalyst B to give an ethylenedialkylphosphinic acid derivative (III) where R 1 -R 6 are each H, R 11 -R 14 are each H,X is H, Ca, Mg, Al, Zn, Ti, Mg, Ce, Fe, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert- butyl, phenyl, 2-hydroxethyl, 2-hydroxypropyl, 3-hydroxypropyl, 4-hydroxybutyl, allyl, glycerol or a combination thereof and the catalyst A is a transition metal or a transition metal compound catalyst system comprising of a transition metal or a transition metal compound and at least one ligand, and the catalyst B is peroxide-forming compound, peroxo compound, azo compound or a combination thereof selected from the group consisting of hydrogen peroxide, sodium peroxide, lithium peroxide, potassium persulfate, sodium persulfate, ammonium persulfate, sodium peroxodisulfate, potassium peroxoborate, peracetic acid, benzoyl peroxide, di-t-butyl peroxide, peroxodisulfuric acid, azodiisobutyronitrile, 2,2′-azobis(2-amidinopropane) dihydrochloride, 2,2′-azobis(N,N′-dimethyleneisobutyramidine) dihydrochloride and a combination thereof.