Metalloidalmethyl substituent effects by 13C and 19F NMR : electron release in the neutral ground state.
作者:W. Adcock、D.P. Cox、W. Kitching
DOI:10.1016/s0022-328x(00)89139-1
日期:1977.6
13C and 19F chemical shift studies of a series of CH2M(CH3)3 and CH2M(C6H5)3 (M Si, Ge, Sn, Pb) - substituted aryl derivatives (phenyl; 1-naphthyl; 2-naphthyl) have established unambiguously that the order of hyperconjugative electron release in the neutral ground state is Pb>Sn>Ge>Si. This order is clearly at variance with the commonly accepted order(Pb>Sn>Ge>Si) based on studies of electron deficient
一系列CH 2 M(CH 3)3和CH 2 M(C 6 H 5)3(MSi,Ge,Sn,Pb)-取代的芳基衍生物(苯基; 1的13 C和19 F化学位移研究(萘基; 2-萘基)已明确地确定,在中性基态下超共轭电子的释放顺序为Pb> Sn> Ge> Si。根据对缺电子衬底的研究,该顺序明显不同于通常接受的顺序(Pb> Sn> Ge> Si)。根据有关σ-π相互作用的最新理论讨论了这种现象。此外,取代基参数(σ我和σ - [R ø)的PB(CH3)利用来自氟苯基标签的新数据推导了3个基团。将这些新常数与以前报告的常数进行比较。