N-bromosuccinmide; oxygen; 5-(2-hydroxyethyl)-4-methyl-3-(phenylmethyl)thiazolium chloride; triethylamine in dimethyl sulfoxide T=25°C; P=760.051 Torr; 28 h; regioselective reaction;

dibenzo-18-crown-6; tetrabutylammomium bromide in acetonitrile 1.75 h; Ambient temperature;