Kinetics and mechanism of oxidation of N,alpha-diphenylnitrones by Pyridinium fluorochromate in aqueous DMF medium

摘要: Kinetics and mechanism of oxidation N, α-diphenylnitrones by pyridinium fluorochromate (PFC) in aqueous DMF medium was followed under different experimental conditions temperatures. The reaction fist order dependence with respect to [PFC] [Substrate], the [H] fractional at low [H + ], but is more than unity high ]. effect ionic strength, dielectric constant MnSO 4 were also studied. All results indicate a protonated nitrone involved slow-step both acid media PFC only two mechanisms are proposed for media. carried out some meta- para- substituted α-diphenylnitrones. electron releasing substituents accelerated with-drawing retard rate reaction, follow common mechanism. negative p value that presence deficient transition state.