Inorganic Chemistry, Vol.54, No.6, 2580-2590, 2015
Influence of the N-N Coligand: C-C Coupling Instead of Formation of Imidazol-2-yl Complexes at {Mo(eta(3)-allyl)(CO)(2)} Fragments. Theoretical and Experimental Studies
New N-methylimidazole (N-MeIm) complexes of the {Mo(eta(3)-allyl)(CO)(2)(N-N)} fragment have been prepared, in which the N,N-bidentate chelate ligand is a 2-pyridylimine. The addition of a strong base to the new compounds deprotonates the central CH group of the imidazole ligand and subsequently forms the C-C coupling product that results from the nucleophilic attack to the imine C atom. This reactivity contrasts with that previously found for the analogous 2,2'-bipyridine compounds [Mo(eta(3)-allyl)(CO)(2)(bipy)(N-RIm)]OTf [N-RIm = N-MeIm, N-mesitylimidazole (N-MesIm, Mes= 2,4,6-trimethylphenyl); OTf = trifluoromethanesulfonate) which afforded imidazol-2-yl complexes upon deprotonation. Density Functional Theory (DFT) computations uncover that the reactivity of the imine C atom along with its ability to delocalize electron density are responsible for the new reactivity pattern found for the kind of molybdenum complexes reported herein.