Ph system, whereY= Si, C andX is H or a donor type atom or group, have been measured by “F NMR techniques. The or parameters from the meta shifts by the method of Taft are small for both the silicon and carbon series. The para “F chemical shifts for the silicon compounds are downfield with respect to the carbon analogs indicating important silicon-phenyl resonance interaction in the ground state. SubtIe changes in substituents at the central ...
[Arnett, Edward M.; Flowers II, Robert A.; Ludwig, Richard T.; Meekhof, Alison E.; Walek, Stuart A. Journal of Physical Organic Chemistry, 1997 , vol. 10, # 7 p. 499 - 513]
