Protonation of benzaldehydes substantially increase the barrier to internal rotation (about the Ph–CO bond) which can be evaluated by dynamic n.m.r., the proton exchange rates between the acid system (SbF5–FSO3H) and the protonated species remaining very low even at temperatures well above coalescence temperature.
R. Jost, P. Rimmelin and J. M. Sommer, J. Chem. Soc. D, 1971, 879 DOI: 10.1039/C29710000879
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