Solution and Gas-Phase Investigations of Trimethylsilylpropyl-Substituted Pyridinium Ions. Manifestation of the Silicon δ Effect
作者:Asimo Karnezis、Richard A. J. O’Hair、Jonathan M. White
DOI:10.1021/om200510a
日期:2011.11.14
propylpyridinium ions 15a (M = Si), 15b (M = Ge), 15c (M = Sn), and 15d (M = Pb) and N-methyl-4-trimethyl-M-propylpyridinium ions 16a (M = Si), 16b (M = Ge), 16c (M = Sn), and 16d (M = Pb) provide evidence for a significant through-bond (double hyperconjugative) interaction between the M–CH2 bond and the low-lying π* orbital of the pyridiniumion. The strength of this interaction increases in the order