| 摘要 |
A process for the preparation of an unsaturated phosphonic acid ester of the formula: R1CH=C(R2)P(=O)(OR3)2 wherein an acetylene compound of the formula: R1C 3BOND CR2 is reacted with a secondary phosphite of the formula: HP(=O)(OR3)2 in the presence of a palladium complex catalyst. The process is characterized in that the reaction is performed in the presence of water or in that the palladium complex catalyst contains, as a ligand, a 1,3-bisphosphinopropane of the formula: wherein R4, R5, R6 and R7 stand, independently from each other, for an alkyl group, a cycloalkyl group, an aralkyl group or an aryl group.
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