Photocatalytic oxidations of lactams and N-acylamines

Preparation, characterization of P-doped TiO2 nanoparticles and their excellent photocatalystic properties under the solar light irradiation

“…At lower contents below the optimum value, P 5+ could inhibit the recombination between photogenerated electrons and holes by capturing the photogenerated electron with the P content increase in TiO 2 [41], leading to enhanced photocatalytic efficiency. However, when the molar ratio exceeded the 0.044, P 5+ became the recombination center of photogenerated electrons and holes, resulting in a decreased photocatalytic activity [42].…”

Photocatalyzed reaction of indole in an aqueous suspension of titanium dioxide

“…Highly regioselective oxidation of the carbon near a heteroatom, for example oxygen and nitrogen, has been accomplished on illuminated semiconductor particles. For example, formation of benzoate esters by photooxidation of benzyl ethers [17] and imides from lactams and N-acylamines in the presence of TiO 2 [25].…”

Photoinduced electron transfer oxygenations

“…Band theory predicts that photocatalyzed oxidations or reductions on their surfaces can occur with adsorbed donors or acceptors when the redox potentials of the substrates lie between their valence and conduction bands. The band positions of common semiconductors (TiO2, SnO2, ZnO, WO3, CdS, CdSe, and others) [230] and how they shift with changes in electrolyte are of great importance for our purposes [231]. In fact, the bands of TiO2 (rutile) shift negative by about 0.7 V vs SCE by changing the solvent from water (pH 1, -0.1 V vs SCE) to acetonitrile [232].…”