Comparative theoretical study of [3+2] and [2+2] cycloadditions of ethylene and WXYMe2; X, YÂ =Â (O), (NH), (CH2)

Quantum chemical calculations using DFT at the B3LYP level show that the addition reaction of ethylene to WXYMe2 where X, Y = (O), (NH), (CH2) are further examples where a [2+2] addition is kinetically preferred over a [3+2] addition.