Extreme Projection of a Proton into the π-Cloud of an Aromatic Ring: Record Shielding of an Aromatic Proton in <i>trans</i>-10<i>b</i>-Methyl-10<i>c</i>-(1-naphthyl)-10<i>b</i>,10<i>c</i>-dihydropyrene
作者:Yuhua Ting、Yee-Hing Lai
DOI:10.1021/ja038380m
日期:2004.1.28
respectively. Both exhibit a strong diamagnetic ring current despite the introduction of an internal bulky substituent within the pi-electron cloud. Their electronic spectra suggest interaction between the two near-perpendicular naphthyl and dihydropyrenyl pi systems, resulting in red shift and band broadening. All naphthyl protons are well resolved in their 1H NMR spectra due to a strong shielding effect of