oxygen; Manganese (II) acetate; benzoic acid in 1,2-dichloro-ethane T=50°C; 2 h; Schlenk technique;

sulfuric acid 6 h; Heating;

1: 1.) 10percent sodium carbonate; 2.) 40percent sodium hydroxide / 1.) water, 80 deg C, 30 min; 2) 1.5 h, water bath 2: 88 percent / 3percent sulfuric acid / 6 h / Heating View Scheme

1: 2) AlCl3 / 1.) diethyl ether, reflux, 30 min; 2.) carbon disulphide, reflux, 30 min 2: 1.) 10percent sodium carbonate; 2.) 40percent sodium hydroxide / 1.) water, 80 deg C, 30 min; 2) 1.5 h, water bath 3: 88 percent / 3percent sulfuric acid / 6 h / Heating View Scheme