1: With n-butyllithium in tetrahydrofuran; pentane T=-15 - 20°C; 1.75 h; 2: With iodine in tetrahydrofuran; pentane T=-75 - 20°C; 3: With water; sodium acetate 5 h; Reflux;

iodine; bis-[(trifluoroacetoxy)iodo]benzene in tetrachloromethane 24 h;