C and Hg nuclear magnetic resonance spectroscopic study of alkenemercurinium ions: Effect of methyl substituents on Hg chemical shifts.
The long-lived ethylene, cyclohexene, and norbornenemercurinium ions prepared in superacidic, low-nucleophilic media have been studied by (13)C and (199)Hg NMR spectroscopy. The norbornenemercurinium ion shows temperature-dependent (13)C and (199)Hg NMR spectra, consistent with equilibration via rapid hydride and Wagner-Meerwin shifts. The (199)Hg NMR shifts of a series of alkylmercury bromides were also obtained in order to elucidate the effect of methyl substituents on (199)Hg NMR chemical shifts.
Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90007.
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Olah
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Garcia-Luna