T=550°C; P=0.001 Torr;

tert.-butylhydroperoxide; silica gel; dichromate(VI)(2-); zirconium oxide in water; benzene T=20°C; Oxidation; 72 h;

1: 72 percent / copper(II) bromide, benzoyl peroxide / tetrahydrofuran / 24 h 2: 95 percent / 24 h / Heating View Scheme

1: 90 percent / oxalic acid, silica gel / CH2Cl2 / 4 h / Ambient temperature 2: 72 percent / copper(II) bromide, benzoyl peroxide / tetrahydrofuran / 24 h 3: 95 percent / 24 h / Heating View Scheme

1: 95 percent / toluene-p-sulphonic acid / various solvent(s) / 2.5 h / Heating 2: 98 percent / diethyl ether / 1.) - 78 deg C, 2 h, 2.) room temperature, 5 h 3: 90 percent / oxalic acid, silica gel / CH2Cl2 / 4 h / Ambient temperature 4: 72 percent / copper(II) bromide, benzoyl peroxide / tetrahydrofuran / 24 h 5: 95 percent / 24 h / Heating View Scheme

1: 98 percent / diethyl ether / 1.) - 78 deg C, 2 h, 2.) room temperature, 5 h 2: 90 percent / oxalic acid, silica gel / CH2Cl2 / 4 h / Ambient temperature 3: 72 percent / copper(II) bromide, benzoyl peroxide / tetrahydrofuran / 24 h 4: 95 percent / 24 h / Heating View Scheme

24 h; Heating;

Verb. 5: Acetanhydrid;