1: 1-bromo-3-trifluoromethyl-benzene With magnesium in diethyl ether T=20°C; 9 h; Heating / reflux; 2: tributyltin chloride in diethyl ether T=20°C; 8 h; Heating / reflux; 3: With water in diethyl ether T=0 - 5°C;

benzoylchlorobis(triphenylphosphine)palladium(II) in chloroform T=65°C; 5 h;