Hindered internal rotation in stable protonated benzaldehydes: nuclear magnetic resonance study
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society D: Chemical Communications
- No. 15,p. 879-881
- https://doi.org/10.1039/c29710000879
Abstract
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.Keywords
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