Not so simple: A combination of 2H, 13C, and 108Pd labels shows that the alkene migration in a σ-alkyl palladium diene complex induced by trifluoromethanesulfonic acid is not intramolecular or acid-mediated, but instead requires a self-generated palladium hydride species (see scheme; Tf=triflate).
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Evans et al. (2009) studied this question.
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