Like the styrene reaction, we conducted some preliminary EPR mechanistic investigations to study the reaction mechanism. Herein, subjecting sodium benzoate to a mixture of PC1 and N-tert-butyl-alpha-phenylnitrone (PBN) under blue led irradiation provided the formation of two adducts. The major adduct could be assigned to an O-centred radical formed through the oxidation of the sodium benzoate (g=2.006, aN=13.5G and aH=1.7G present in 65%) (Scheme 7). Based on this preliminary result and the proposed catalytic cycle reported by the Glorius group, we suggest that the following mechanism could take place under our reaction conditions. The organophotocatalytic cycle starts with the oxidation of sodium benzoate to afford the PhCOO radical. This radical undergoes HAT process with the aldehyde starting material to form the desired benzoyl radical, which subsequently reacts with reagent I to deliver the desired product. Once again, On/Off experiments were conducted and confirmed the stepwise mechanism involved in this transformation (see ESI for details) Scheme 8. Proposed mechanism for the synthesis of Aroyl-SCF3