1: With AlCl3, aluminium chloride; N,N-dimethyl-aniline in dichloromethane T=20°C; 21 h; Inert atmosphere; 2: With hydrogenchloride in dichloromethane; water Inert atmosphere; 3: With water; bis-[(trifluoroacetoxy)iodo]benzene in acetonitrile T=0°C; 2 h; Inert atmosphere;