Study of the regioselectivity and diastereoselectivity in the addition of 3-substituted-2-propenylmetal reagents to N,N′-di[1(S)-phenylethyl]ethanediimine
stereocentres were formed and the simple (syn/anti) diastereoselectivity was dependent on the alkene geometry in the allylmetal reagents. C2-symmetric compounds with syn–syn–syn or anti–syn–anti relative stereochemistry were prevalently obtained. In contrast, when 3-ethoxy-2-propenylzinc chloride was prepared by transmetallation of the corresponding titanium reagent, a C1-symmetric compound (anti–syn–syn)