The 1-(Trimethylsilyl) bicyclobutonium Ion: NMR Spectroscopy, Isotope Effects, and Quantum Chemical Ab Initio Calculations of a New Hypercoordinated Carbocation

HU Siehl, M Fuss, J Gauss

Index: Siehl, Hans-Ullrich; Fuss, Martin; Gauss, Juergen Journal of the American Chemical Society, 1995 , vol. 117, # 22 p. 5983 - 5991

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Citation Number: 21

Abstract

Abstract: The 1-(trimethylsilyl) bicyclobutonium ion is generated from (1'-(trimethylsily1) cyclopropyl) methanol by reaction with SbF5. The NMR spectroscopic data in S02ClF/S02F2 solution at-128" C are in accord with a bridged puckered bicyclobutonium structure undergoing a 3-fold rapid degenerate rearrangement that renders the two p-and one y- methylene groups equivalent, leading to one averaged I3C-NMR signal for the CH2 ...

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