Method for Producing Dialkylphosphinic Acids and Esters and Salts Thereof by Means of Vinyl Compounds and Use Thereof

A method for producing monocarboxy-functionalized dialkylphosphinic acids, esters or salts, comprising the steps of

• a) reacting a phosphinic acid source (I)
• with one or more olefins IV
• in the presence of a catalyst A to form an alkylphosphonous acid, salt or ester (II)
• b) reacting the alkylphosphonous acid, salt or ester (II) with one or more acetylenic compounds of the formula (V)
• in the presence of a catalyst B to form a monofunctionalized dialkylphosphinic acid derivative (VI)
• c) reacting the monofunctionalized dialkylphosphinic acid derivative (VI) with carbon monoxide in the presence of a catalyst C and water or an alcohol M-OH and/or M′-OH to form a monocarboxy-functionalized dialkylphosphinic acid derivative (III)
• where R1, R2, R3, R4, R5, R6 are identical or different and are each independently H, C1-C18-alkyl, C6-C18-aryl, C6-C18-aralkyl, C6-C18-alkylaryl, CN, CHO, OC(O)CH2CN, CH(OH)C2H5, CH2CH(OH)CH3, 9-anthracene, 2-pyrrolidone, (CH2)mOH, (CH2)mNH2, (CH2)mNCS, (CH2)mNC(S)NH2, (CH2)mSH, (CH2)mS-2-thiazoline, (CH2)mSiMe3, C(O)R7, (CH2)mC(O)R7, CH═CH—R7, or CH═CH—C(O)R7 and where R7 is C1-C8-alkyl or C6-C18-aryl and m is an integer from 0 to 10 and X and Y are identical or different and are each independently H, C1-C18-alkyl, C6-C18-aryl, C6-C18-aralkyl, C6-C18-alkylaryl, (CH2)kOH, CH2—CHOH—CH2OH, (CH2)k—O—(CH2)kH, (CH2)k—CH(OH)—(CH2)kH, (CH2—CH2O)kH, (CH2—C[CH3]HO)kH, (CH2—C[CH3]HO)k(CH2—CH2O)kH, (CH2—CH2O)k(CH2—C[CH3]HO)H, (CH2—CH2O)k-alkyl, (CH2—C[CH3]HO)k-alkyl, (CH2—C[CH3]HO)k(CH2—CH2O)k-alkyl, (CH2—CH2O)k(CH2—C[CH3]HO)O-alkyl, (CH2)k—CH═CH(CH2)kH, (CH2)kNH2, (CH2)kN[(CH2)kH]2, where k is an integer from 0 to 10, Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Cu, Ni, Li, Na, K, H a protonated nitrogen base or a combination thereof and the catalysts A, B, C and D are transition metals, transition metal compounds, catalyst systems composed of a transition metal or a transition metal compound and at least one ligand or a combination thereof.