oxygen; toluene-4-sulfonic acid; Sensitox 1.) CH2Cl2, 30 min, irradiation, 2.) benzene, 24 h, reflux; Yield given. Multistep reaction;

Sensitox (Rose Bengal polymer); oxygen; toluene-4-sulfonic acid 1.) irradiation in CH2Cl2, 30 min, 2.) heating in benzene, 24 h; Yield given. Multistep reaction;