Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Ab Initio Study of Mechanism of Forming Spiro-Heterocyclic Ring Compound Involving Si and Ge from Dichlorosilylene Germylidene (Cl2Si-Ge:) and Acetone

  • Liu, Dongting (School of Chemistry and Chemical Engineering, University of Jinan) ;
  • Ji, Hua (Department of Medicine, Shandong Medical College) ;
  • Lu, Xiuhui (School of Chemistry and Chemical Engineering, University of Jinan)
  • Received : 2011.11.10
  • Accepted : 2012.09.21
  • Published : 2012.12.20
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Abstract

The mechanism of the cycloaddition reaction between singlet state dichlorosilylene germylidene ($Cl_2Si=Ge:$) and acetone has been investigated with B3LYP/6-$31G^*$ and B3LYP/6-$31G^{**}$ method, from the potential energy profile, we predict that the reaction has one dominant reaction pathway. The presented rule of the reaction is that the two reactants firstly form a Si-heterocyclic four-membered ring germylene through the [2+2] cycloaddition reaction. Because of the 4p unoccupied orbital of Ge atom in the Si-heterocyclic four-membered ring germylene and the ${\pi}$ orbital of acetone forming a ${\pi}{\rightarrow}p$ donor-acceptor bond, the Si-heterocyclic four-membered ring germylene further combines with acetone to form an intermediate. Because the Ge atom in the intermediate hybridizes to an $sp^3$ hybrid orbital after the transition state, then, the intermediate isomerizes to spiro-heterocyclic ring compound involving Si and Ge (P4) via a transition state.

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References

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