Previously, a mechanistic twist to the oxidation of imines using peracid had emerged. Time to see how substituents respond to this mechanism.
Posts Tagged ‘Imine’
σ or π nucleophilic reactivity of imines? A mechanistic reality check using substituents.
Sunday, October 9th, 2016σ or π nucleophilic reactivity of imines? A mechanistic twist emerges.
Wednesday, September 28th, 2016The story so far. Imines react with a peracid to form either a nitrone (σ-nucleophile) or an oxaziridine (π-nucleophile).[cite]10.1016/S0040-4039(00)98582-4[/cite] The balance between the two is on an experimental knife-edge, being strongly influenced by substituents on the imine. Modelling these reactions using the “normal” mechanism for peracid oxidation did not reproduce this knife-edge, with ΔΔG (π-σ) 16.2 kcal/mol being rather too far from a fine balance.