Palladium-catalyzed arylation and vinylation of dialkyl ethenephosphonates

Dialkyl ethenephosphonates,on reaction with aryl bromides in the presence of palla-dium catalyst,gave the corresponding 2-arylethenephosphonates（6 or 7）in moderate to good yields.Thus,it provides a simple and facile synthesis of 2-arylethenephosphonates.TheirP-NMR chem-ical shifts show a linear correlation with the Hammett σ constants of the substituents in the benzenering.Similarly,diethyl ethenephosphonate underwent palladium-catalyzed vinylation reaction withvinyl bromides and the corresponding substituted 1,3-dienephosphonates（10）were formed,thoughin less satisfactory yields.The configurations of compounds 6,7 and 10 were determined by NMRspectroscopy.