1: With iodine; magnesium; ethylene dibromide in tetrahydrofuran T=20°C; 0.5 h; 2: 1-bromo-4-(1,1-dimethylethyl)benzene in tetrahydrofuran T=24 - 40°C; 0.5 h; 3: phosphorous acid diethyl ester in tetrahydrofuran T=21 - 22°C; 0.5 h;

1: With pyridine in diethyl ether T=-78°C; 4 h; Reflux; 2: With hydrogenchloride; water in diethyl ether; water T=20°C; 3 h;

1: 1-bromo-4-(1,1-dimethylethyl)benzene With iodine; magnesium in tetrahydrofuran 2 h; Heating; 2: phosphorous acid diethyl ester in tetrahydrofuran 2 h; Heating;