Electron-transfer induced oxidation of 2-oxo-1,2,3,4-tetrahydropyridines using TiO2 anatase-nanoparticles: steric and electronic substitution effects

The steric and electronic effects of 4-substitution in various 4-aryl substituted 5-carboethoxy-2-oxo-1,2,3,4-tetrahydropyridines were investigated by exposing them to the UV-light in the presence or absence of the TiO2 anatase-nanoparticles. The results clearly indicate the effective presence of the photo-catalyst and also the electron-donating effect of 4-aryl substitution on drastic decreasing of the irradiation time. The experimental results concerning the electronic nature of 4-substitution were supported by the DFT computational studies and cyclic voltammetric measurements.