Alkylphosphonous acids, salts and esters, methods for the production thereof, and use of the same
View Patent ↗The invention relates to alkylphosphonous acids, salts and esters of formula (I) A-P(═O)(OX)—H (I) wherein A is C 2 -C 20 alkyl, C 2 -C 20 alkylene, and C 8 -C 20 alkaryl are optionally substituted, and X is H, alkyl, aryl, alkylaryl, alkenyl, substituted alkyl, aryl, alkaryl, alkenyl, ammonium, primary, secondary, tertiary, quaternary alkyl and/or aryl ammonium, an alkali metal, an alkaline earth metal, a metal of the third and fourth main group and the second, fourth and eight sub-group or a metal of the lanthanoid group. The invention also relates to methods for producing same and to the uses of said compounds.
1. A process for the production of an alkylphosphonous acid, alkylphosphonous salt or alkylphosphonous ester, comprising the step of reacting a source of phosphinic acid with one or more olefins in the presence of a catalyst or a catalyst system, and where the source of phosphinic acid is phosphinic acid, a salt of phosphinic acid, an ester of phosphinic acid, or a mixture of these, wherein the catalyst is a transition metal, transition metal compound or wherein the catalyst system is a transition metal, a transition metal compound, and at least one ligand, wherein the one or more olefins are ethylene, 1-propylene, 1-butene, 1,3-butadiene, 3 methyl-but-1-ene or a mixture thereof, wherein the transition metal and transition metal compound are rhodium, nickel, palladium, platinum or a combination thereof and wherein the partial pressure of the olefin during the reaction is from 0.1 to 10 bar.
2. The process for the production of an alkylphosphonous acid, alkylphosphonous salt or alkylphosphonous ester, as claimed in claim 1 , further comprising
a) reacting the source of phosphinic acid with the olefin in the presence of a catalyst and optionally a solvent,
b) optionally removing the solvent, the olefin or both,
c) removing the catalyst, catalyst system, transition metal, transition metal compound,
d) removing the ligand, complexing agent or both, and
e) removing the auxiliary, olefin or both.
3. The process for the production of alkylphosphonous acid, alkylphosphonous salt or alkylphosphonous ester, as claimed in claim 1 , further comprising
a) reacting the source of phosphinic acid with olefins in the presence of a catalyst, and
b) removing insoluble product by filtration.
4. The process for the production of an alkylphosphonous acid, alkylphosphonous salt or alkylphosphonous ester, as claimed in claim 1 , further comprising
a) reacting the source of phosphinic acid with olefins in the presence of a catalyst,
b) optionally removing the catalyst,
c) removing the ligand, complexing agent or both, and
d) removing the solvent.
5. The process for the production of an alkylphosphonous acid, alkylphosphonous salt or alkylphosphonous ester, as claimed in claim 1 , further comprising
a) reacting the source of phosphinic acid with olefins in the presence of a catalyst,
b) optionally removing the catalyst,
c) removing the ligand, complexing agent or both, and
d) removing the solvent,
e) at least 90% of the complexing agent, the ligand, catalyst or any combination thereof that has been removed is returned to step a).
6. The process as claimed in claim 1 , wherein the salt of phosphinic acid is an alkali metal salt, an alkaline earth metal salt, a salt of the elements of the third or fourth main group and of the second, fourth, or eighth transition group, or of the lanthanoid group, an ammonium salt, or a primary, secondary, tertiary, or quaternary alkyl- or arylammonium salt.
7. The process as claimed in claim 1 , wherein the catalyst system is formed via reaction of a transition metal a transition metal compound, and at least one ligand.
8. The process for the production of an alkylphosphonous acid, alkylphosphonous salt or alkylphosphonous ester as claimed in claim 1 , wherein the phosphinic acid is hypophosphorous acid H 3 PO 2 .