摘要

The mechanism of the cycloaddition reaction between singlet state germylene silylene (H2Ge=Si:) and ethene was investigated by the CCSD(T)////MP2/6-31G* method. From the potential energy profile, it can be predicted that the reaction has only one dominant reaction pathway. The presented rule of the dominant reaction pathway is that the [2+2] cycloaddition effect of the two reactants leads to the formation of a four-membered ring silylene with Ge (INT1). Due to sp(3) hybridization of the Si atom in four-membered ring silylene with Ge (INT1), INT1 further reacts with ethene to form a bis-heterocyclic compound with Si and Ge (P2).