aryl(dihalo)boranes to generate boroles through aluminum–boron exchange. The products feature a rare alkyl-substituted backbone, which, as shown in other examples, often leads to dimerization due to insufficient steric protection of the antiaromatic borole ring. Sterically crowded aryl groups bound to the boron atom are shown to prevent dimerization, allowing access to the first monomeric derivatives of this type
据报道,铝分子 Cp 3t AlC 4 Et 4 (Cp 3t = 1,2,4-三(叔丁基)
环戊二烯基)能够将其
丁二烯部分转移到芳基(二卤)
硼烷上,通过铝-
硼交换生成
硼咯。该产品具有罕见的烷基取代主链,如其他示例所示,由于反芳香
硼杂环的空间保护不足,常常导致二聚化。与
硼原子结合的空间拥挤的芳基被证明可以防止二聚化,从而允许获得这种类型的第一个单体衍
生物。紫外可见光谱、电
化学和 DFT 计算的结果表明,与全芳基化对应物相比,烷基取代基导致
硼杂环化合物的光学和电子性质发生显着改变。