The acid catalyzed isomerization of several substituted oxanorbornadienes 4 and oxepines 10 - easily available from 4 by a photochemical and a consecutive thermal step - allows the synthesis of several highly substituted phenols and 2,4-cyclohexadienones in a straightforward manner and with good to excellent yields. The formation of the methoxycarbonyl-hexadienes 18e and 18f upon photolysis of 9e and
几种取代的氧杂降
冰片二烯4和oxepines 10的酸催化异构化(可通过光
化学法和连续的热步骤从4轻松获得)允许以直接的方式合成数个高度取代的
苯酚和2,4-环己二酮,并具有良好或优异的收率。9e和17f在
甲醇中光解后形成的甲氧羰基-
己二烯18e和18f有助于结构阐明。讨论了Mc
LAFFERTY和
EMERY效应在甲氧基羰基和甲基取代
酚的质谱降解中的相对重要性。