1: cyclohexenon; dimethyl zinc With copper(I) thiophene-2-carboxylate; chiral 2,2'-biphenyl-derived (R,R)-phosphine ligand in diethyl ether; toluene T=-30°C; 0.333333 h; 2: 3-bromoprop-1-ene-2-phosphonic acid diethyl ester in diethyl ether; toluene T=20°C; Title compound not separated from byproducts;