1: 4-bromo-1-chloro-2-iodo-benzene With isopropylmagnesium chloride in tetrahydrofuran T=-75 - 20°C; 2 h; 2: boric acid trimethyl ester in tetrahydrofuran T=-78 - 20°C; 2 h; 3: With hydrogenchloride; water in tetrahydrofuran T=20°C;