作者:Jungwun Hwang、Ping Li、Mark D. Smith、Ken D. Shimizu
DOI:10.1002/anie.201602752
日期:2016.7.4
meta‐position, smaller groups were stabilizing and larger groups were destabilizing. Conversely, at the farther para‐position, the larger alkyl groups were systematically more stabilizing with the bulky tBu group forming the strongest stabilizing interaction. X‐ray crystal structures showed that the stabilizing interactions of the small meta‐alkyl and large para‐alkyl groups were due to their similar
在溶液中通过实验测量了烷基对芳族堆积相互作用的稳定和去稳定作用。在设计用于测量分子内芳族相互作用强度的分子平衡模型系统中,烷基的大小(Me,Et,i Pr和t Bu)和位置(间位和对位)有所不同。在芳环上不同位置的烷基取代基观察到相反的稳定性趋势。在越接近元位上,更小的组被稳定和较大的组均不稳定。相反,在较远的对位上,较大的烷基基团进行了系统的多用笨重稳定吨卜基形成最强的稳定相互作用。X射线晶体结构表明,较小的间烷基和较大的对烷基的稳定相互作用是由于它们的相近距离以及与相对芳环边缘的范德华接触面积所致。