1: (-)-(S,E)-3-[2-(diphenylphosphanyl)benzoyloxy]-1-phenyl-1-pentene With copper(I) bromide dimethylsulfide complex in diethyl ether T=20°C; 0.0833333 h; 2: methyl-magnesium iodide in diethyl ether T=20°C; 2 h; Further stages.;