Aluminum tris(dihydrogen phosphate) [Al(H2PO4)3] as an efficient and heterogeneous catalyst for the environmentally friendly preparation of N,N′-alkylidene biscarbamates

A tri-component reaction of phenyl acetylene/1-Hexyne, aromatic aldehyde and benzyl/methyl carbamate. Aluminum tris(dihydrogen phosphate) [Al(H₂PO₄)₃] has been described to establish different kinds N,N´-alkylidene biscarbamates. The corresponding N,N´-alkylidene biscarbamates have been obtained in good to excellent yields. The prepared catalysts were characterized by X-ray diffraction. The products were obtained with high conversion and yields.