TCPPClO4; oxygen in acetonitrile 2 h; Irradiation;

dichloro-acetic acid; oxygen in acetonitrile 10 h; Irradiationother senstizers, times and solvent; photosensitized oxygenation reaction; Product distributionMechanism;

silica gel; iron(III) chloride in dichloromethane 3 h; Ambient temperature;

1: 78 percent / BF3*Et2O / benzene / 24 h / Ambient temperature 2: 96 percent / 2,4,6-tris(p-chlorophenyl)pyrylium perchlorate, oxygen / CH2Cl2 / 0.3 h / Irradiation 3: 92 percent / FeCl3-silica gel / CH2Cl2 / 3 h / Ambient temperature View Scheme

1: 96 percent / 2,4,6-tris(p-chlorophenyl)pyrylium perchlorate, oxygen / CH2Cl2 / 0.3 h / Irradiation 2: 92 percent / FeCl3-silica gel / CH2Cl2 / 3 h / Ambient temperature View Scheme