1: 1-bromo-4-methoxy-benzene With magnesium in diethyl ether T=40°C; 12 h; 2: 4-Bromo-benzoic acid methyl ester in diethyl ether T=40°C; 18 h;

1: 1-bromo-4-methoxy-benzene With magnesium in tetrahydrofuran 1 h; Heating; 2: 4-bromo-benzoic acid ethyl ester in tetrahydrofuran Further stages.;