The prediction made by high level ab initio theory (MP4/6-311G**//MP2/6-311G**+ZPE) that the prop-2-yl cation prefers a twisted structured with C2 symmetry is supported by the excellent and unique correspondence of the experimental and individual Gauge for Localized molecular Orbitals (IGLO) calculated 13C n.m.r. chemical shifts for that conformation.
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Schleyer et al. (1989) studied this question.
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