(B3LYP/6-31G*), which predict that the activation energies for Diels-Alder cycloadditions in the bay regions of periacenes should diminish monotonically as the length of the molecule increases. This structure-activity relationship offers hope that single-chirality carbon nanotubes can be grown from suitable hydrocarbon templates, without metal catalysis, by a Diels-Alder cycloaddition/rearomatization strategy
已从联
蒽酮分三步合成了可溶性联杂
蒽衍
生物 4,11-二甲基联杂
蒽。在热
甲苯中,这种双
蒽与
乙炔二
甲酸二
乙酯发生干净的狄尔斯-阿尔德反应,生成重芳构化的 1:1 环加合物,更慢地生成重构化的 2:1 环加合物。在与较短的“并苯”
苝进行的竞争实验中,只有双
蒽反应,而
苝保持不变。实验结果与密度泛函计算 (B3LYP/6-31G*) 完全一致,该计算预测在并苯的海湾区域中 Diels-Alder 环加成的活化能应随着分子长度的增加而单调减少。