transition structure (10) for the dimerization of s-Z-formylketene (8) is consistent with this mechanism. Trapping of 2 with alcohols shows selectivity comparable to other alpha-oxoketenes. The lack of reaction of 2 with benzaldehyde and the lack of enol tautomers in camphoric acid derivatives is attributed to angle strain in the bicyclic camphor moiety.
樟脑烯酮(2)的二聚体(3和4)的立体
化学已经确定。3、20和相关化合物的晶体结构显示出基态畸变,这被解释为预形成了平面,假周环过渡态,以进行逆向环加成反应形成α-氧杂
环丁烯。B3LYP / 6-31G *用于sZ-甲酰基
乙烯酮(8)二聚化的过渡结构(10)的优化几何形状与该机理一致。用醇捕集2的选择性与其他α-氧杂
环丁烷相当。
樟脑酸衍
生物中2与
苯甲醛的反应不足和烯醇互变异构体的缺乏归因于双环
樟脑部分的角度应变。