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11) We assume that the alkylation-hydrogen transfer is best formulated by an edge-protonated cyclopropane. Studies of product and kinetic isotope effects in dimerization of CF3CH=CD2 and isomeric CF3CF1=CHD that are in progress should permit a more definitive characterization of this possible r route to protonated cyclopropane.(12) The ambident nature of the allylic ions of this scheme provide several points of branching for the reaction path. None of these branching points appear to be significant in HSOsF solvent; cf. ref 13.(13) P. C. Myhre and G. D. Andrews, ibid., 92, 7596 (1970).