Réaction de photocyclodéshydrogénation par catalyse photorédox
This thesis presents a new method to perform the Mallory reaction by using visible light. To achieve this goal, photoredox chemistry which has emerged recently, was used to effect efficient use of visible light. Moreover, continuous flow chemistry was used to increase the irradiated reaction mixture surface.  During this work, a new photochemical method using a copper photocatalyst and visible light proved efficient for the synthesis of 5helicene. An oxidative quenching mechanism was proposed for this transformation. Also, this new method was used for the synthesis of a 5helicene derivative and a 4helicene-pyrene hybrid.  The photochemical method featuring a copper photocatalyst with visible light was used next for the synthesis of various carbazoles substituted by alkyl and aryl groups at the nitrogen position. During this synthesis, the reaction exhibited a regioselective issue that was further studied in the synthesis of new triarylamines. Finally, it was discovered that an iron photocatalyst can replace the copper photocatalyst by using oxygen as the oxidant in the synthesis of 9-phenylcarbazole.
carbazoles helicenes photochemistry continuous-flow photoredox copper iron