Phosphine-catalyzed α-P-addition on activated alkynes:: A new route to P-C-P backbones

n-Tributylphosphine was found to efficiently catalyze the alpha-P addition of H-phosphonates, H-phosphinates, and H-phosphine oxide pronucleophiles on alkynes bearing phosphane oxide activating moieties. The reaction leads to 2-aryl-1-vinyl-1,1-diphosphane dioxide derivatives in good yields affording a new route to P - C - P backbones. The products of this reaction are easily converted to biologically important 1,1-bisphosphonates analogues.