" M= ZnX for all organometallics 3. M= Cu (CN) Li for all organometallics 4. M= Cu (CN) ZnX for all organometallics 5." Al alkenes and dienes are pure€ and E, E compounds. CAll yields refer to isolated yields of analytically pure compounds for which satisfactory spectral data (IR,'H and" C NMR, mass spectra, and high-resolution mass spectra) have been obtained (supplementary material). dThe lithium compound was prepared from the corresponding ...