1,3-Diarylpropynones ArC≡CCOAr′ in superacids with H 0 ranging from −20 to − 14 undergo protonation at the carbonyl oxygen atoms to give stable ArC≡CC(O+H)Ar′ ions or at the acetylenic C2 atom with formation of reactive ArC+=CHCOAr′ species. The effects of the Ar and Ar′ substituents and reaction conditions on the intramolecular cyclization of ArC+=CHCOAr′ to 3-arylinden-1-ones are discussed.
1,3-二芳基
丙炔酮 ArC≡CCOAr′ 在酸度范围 H 0 从 -20 到 -14 的超酸中发生质子化,形成稳定的 ArC≡CC(O+H)Ar′ 离子,或在聚炔 C2 原子处质子化,生成反应性 ArC+=CHCOAr′ 物种。讨论了 Ar 和 Ar′ 取代基及反应条件对 ArC+=CHCOAr′ 内分子环化成 3-芳基
茚-1-酮的影响。