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Pathways for the cyclohexane face-flip in [1-C6H12][BArF4]. The upper pathway shows potential 1,2-bis σ-intermediates as Newman projections looking down the C2–C1 bond, but which proved inaccessible in the solid-state. The lower pathway shows the proposed H2-facilitated pathway with free energies in kcal/mol. See text for details.
