Hydrogenation of phenylphosphonic acid
AssigneeImperial Chemical Industries PLC
InventorMichael Yelland
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Abstract
A cycloalkyl phosphorus compound is obtained by the catalytic hydrogenation of a substituted or unsubstituted aryl phosphonic acid using a heterogeneous catalyst which is a Group VIII metal on carbon. The hydrogenation is preferably effected in water. The catalyst can be ruthenium or carbon. When phenylphosphonic acid is used as the starting material, a yield of about 95% of essentially pure cyclohexylphosphonic acid can be obtained.
Claims11
A process for producing a cycloalkyl phosphonic acid which comprises hydrogenating a phenyl phosphonic acid optionally substituted with an amino-group or at least one alkyl group containing from 1 to 6 carbon atoms in the presence of a liquid medium in which the phosphonic acid reaction product is soluble under the reaction conditions and which is not reactive with the phosphonic acid and a heterogeneous catalyst which is a Group VIII metal on carbon.
A process which comprises hydrogenating a phenyl phosphonic acid optionally substituted with an amino-group or at least one alkyl group containing from 1 to 6 carbon atoms in the presence of water and a heterogeneous catalyst which is a Group VIII metal on carbon wherein the catalyst contains at least 1% and not more than 10% by weight of the group VIII metal.
A process for producing cyclohexyl phosphonic acid comprising hydrogenating phenylphosphonic acid in the presence of a liquid medium in which the phosphonic acid reaction product is soluble under the reaction conditions and which is not reactive with the phosphonic acid and a heterogeneous catalyst which is a Group VIII metal on carbon.
Dependencies are inferred from the claim text.