Abstract
Hybrid density functional theory (B3LYP) and ab initio (CCSD(T)) calculations were performed to explore the reaction energy pathways of the valence isomerizations among the disilabenzene isomers, namely, bis(silacyclopropenyl) ( 1), disila(Dewar benzene) ( 3) and disilabenzvalene ( 4). The computational study predicts that the interconversion of 1 to 3 and 4 occurs spontaneously. However, the interconversion between Dewar benzene ( 3) and benzvalene ( 4) analogs is a multistep process involving a new intermediate structure 2a, with energy barriers lying above 30 kcal/mol in energy compared to 3 and 4.
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