substitution. Mixtures of furanones 2 and chromanones 4 were obtained from α-unsubstituted substrates 1b–d, as in the case of 1a. Instead, among the α-mono substituted substrates 1f and 1g selectively gave cycloneptatrienes 3f and 3g, respectively, while 1e and 1h gave mixtures of the corresponding 3 and 4. Cycloheptatrienes 3 easily rearranged to chromanones 4. The intermediacy of norcaradienes 5 has
研究了双(六
氟乙酰乙酰丙酮)Cu II在α'-
碳上带有
苯氧基的支链α-重
氮酮1上引起的分解。已经表明反应过程取决于取代。与1a的情况一样,
呋喃酮2和发
色酮4的混合物是从α-未取代的底物1b - d中获得的。取而代之的是,在α-单取代的底物1f和1g中,分别选择性地给出
环庚烯3f和3g,而1e和1h给出相应的混合物。3和4。
环庚三烯3容易重新排列为发色团4。norcaradienes的中间性5已初步在催化分解提出1,并且在重排3E - ħ至4E - ħ。