Abstract: Deuterium substitution in the methyl groups induces long-range downfield shifts in" C NMR signals of the ortho and para positions of the phenyldimethylcarbenium ion. Similar downfield isotope shifts occur in I9F signals of (p-fluoropheny1) carbenium ions upon deuteration of a-methyl groups. These NMR isotope shifts are analogous to secondary@- deuterium isotope effects on rates and equilibria and arise from hyperconjugative ...
[Sanz, Roberto; Martinez, Alberto; Guilarte, Veronica; Alvarez-Gutierrez, Julia M.; Rodriguez, Felix European Journal of Organic Chemistry, 2007 , # 28 p. 4642 - 4645]
