TEA; Titanium(IV) oxide in N,N-dimethyl-formamide 0.5 h; Irradiationother solvent, time; deoxygenation of triaryl group VA compounds Ar3MO (M = P, As, Sb, Bi) on the surface of illuminated TiO2 in the presence of Et3N, relative order of reactivity; mechanism of photoreduction; Product distribution;