compounds bearing a quaternary stereogenic center have been obtained using asymmetric intramolecular Buchner reaction with excellent yields and level of enantioselectivity. X-ray crystallography determination of the absolute configuration of one product has led to the serendipitous observation of an unusual behavior within the crystal structure, with equilibrating norcaradiene and cycloheptatriene valence
使用不对称分子内布氏反应以优异的收率和对映选择性
水平获得了带有季立体中心的
双环化合物。X射线晶体学测定一种产物的绝对构型已导致偶然观察到晶体结构内的异常行为,使
降冰片烯和
环庚三烯化合价异构体处于固态平衡,甚至是出乎意料的中间形式。进行DFT计算以支持这些观察。