Patent ID: 7772440

Claim:
A process for preparing a phosphonate, comprising the steps of: subjecting a phosphite represented by the general formula (II): wherein R 1 and R 2 are, the same as or different from each other, a straight or branched alkyl, cycloalkyl or aryl group; or alternatively R 1 and R 2 , together with the oxygen atom and phosphorus atom to which they are attached, may constitute a ring structure and a carbonyl compound represented by the general formula (III): wherein R 3 and R 4 are, the same as or different from each other, a straight or branched alkyl or aryl group; or alternatively R 3 and R 4 , together with the carbon atom to which they are attached, may constitute a ring structure to an addition reaction in the coexistence of 1 to 50 mol % of an aliphatic tertiary amine or a metallic amide with respect to the phosphite (II) and 0.1 to 5 mol % of a metallic halide with respect to the phosphite (II), to obtain a phosphonate having a tertiary alcoholic hydroxyl group represented by the general formula (I): herein R 1 , R 2 , R 3 and R 4 each are as defined above.