Evidence for rapid equilibrium between two isomeric 9,9-diaryl quinonoid ketenes via benzocyclobutenone was presented on the basis of the correlation between siteselectivity and HOMO-LUMO energy separation on their intramolecular cycloadditions.
根据分子内环加成的位点选择性和 HOMO-LUMO 能量分离之间的相关性,提出了通过
苯并环丁烯酮在两种异构的 9,9 二芳基醌酮之间实现快速平衡的证据。