1: With iodine; magnesium; ethylene dibromide in tetrahydrofuran T=20°C; 1 h; 2: 5-Bromo-1,3-dimethyl-2-methoxybenzene in tetrahydrofuran T=5 - 40°C; 1 h; 3: phosphorous acid diethyl ester in tetrahydrofuran T=5°C; 2 h;

1: With iodine; magnesium in tetrahydrofuran T=0 - 20°C; 1 h; Inert atmosphere; 2: With phosphonic acid diethyl ester in tetrahydrofuran T=0 - 20°C; 12 h; Inert atmosphere;

in tetrahydrofuran T=0°C;

trichlorosilane; triethylamine in xylene Heating;