by 1H, 13C, NOESY, and COSY spectroscopic studies and single-crystal X-ray diffraction. 7 exhibits unprecedented use of an intramolecular C–H activation of an aromatic ring and simultaneously releases of one equivalent of neopentane. DFT calculation supports a mechanism in which the metal passes through a transition state involving a coplanar arrangement with its three ligands (CAr, HAr, CNp).
的烷基化(dichlorotantala) - p -叔-butylcalix [4]
芳烃1和3通过NpMgCl两个当量(NP =新戊基),得到相应的未报告(bisneopentyltantala) - p -叔-butylcalix [4]
芳烃4和5。这些配合物可以通过适度升高温度进行脱烷基化,得到6和7。配合物6和7的表征和结构构象由1 H,13确定C,NOESY和COZY光谱研究和X射线单晶衍射。7展示了对芳香环的分子内C–H活化的空前使用,并同时释放了一当量的
新戊烷。DFT计算支持一种机制,其中
金属穿过过渡态,该过渡态包括其三个
配体(C Ar,H Ar,C Np)的共面排列。