12-dihydropleiadene have been synthesized. Their facile hydration to bridged epoxide structures suggests a non-planar boat structure in which they react as dienes. Evidence is presented for the base-catalyzed tautomerization of the former to the 18π peripheral aromatic 5,10-dimethylacepleiadylene. The isoelectronic diketone and methylene ketones in the acepleiadene series similarly tautomerize with potassium
已经合成了 5,10-Dimethylene-5,10-dihydroacepleiadene 和 7,12-dimethylene-7,12-dihydropleiadene。它们与桥接
环氧化物结构的轻松
水合表明它们是一种非平面船结构,其中它们作为二烯反应。有证据表明前者在碱催化下互变异构化为 18π 外围芳香族 5,10-二甲基
乙炔。acepleiadene 系列中的等电子二酮和亚甲基
酮类似地与
二甲基亚砜中的
叔丁醇钾互变异构,产生稳定的自由基阴离子。