Direct synthesis of alkynylphosphonates from alkynes and phosphite esters catalyzed by Cu/Cu2O nanoparticles supported on Nb2O5

Abstract

The aerobic oxidative coupling of alkynes and phosphite esters can be catalyzed by Cu/Cu₂O nanoparticles supported on Nb₂O₅ (Cu/Cu₂O@Nb₂O₅) to efficiently afford alkynylphosphonates. The catalyst can be reused by filtration and reduction. According to the results of control experiments and characterization data, the supporter Nb₂O₅ can reduce the electronic density of Cu and absorb the phosphite esters due to its strong Lewis acid sites, which may enhance the reaction efficiently.