Carbon 13 chemical shifts diene complexes

Group 4 transition aza-metal-diene complexes have received considerable attention because of their unique M-N and M-C bonding properties and their high reactivity toward a broad range of electrophiles and unsaturated hydrocarbons. Reduction of CpTiCl3 with magnesium in THF in the presence of the appropriate 1-aza-l,3-diene affords the 1-aza-l,3-diene titanium complexes CpTiCl[N(R)CH=C(Me)CH(Ph)] (Scheme 217). Spectroscopic data indicate that the aza-diene ligands adopt a cis-supine conformation in the case of the Buc derivative a solution equilibrium with the /)nw-disposition is observed. The chemical shifts of the terminal carbon atoms of the aza-diene... 

Carbon-13 chemical shifts of diene-irontricarbonyl complexes... 

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