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A) Proposed reaction pathway, with approximate C=O stretching frequencies. B) In situ infra‐red trace of the reaction of N‐aryl 2‐benzylbenzamide 3 h, showing diagnostic changes in carbonyl‐stretching frequencies. C) Plot of absorbance against time for peaks at 1652 cm−1 (3 h, starting material) and 1560 cm−1 (4 h, product anion). D) Deuterium‐exchange study with N‐aryl 2‐benzylbenzamide 3 h.
