WII(CO)3(LX)2 (LX = tropolonate, acetylacetonate) will react with unsaturated substrates capable of donating up to 4 electrons to lose two COs and form complexes of the type WII(CO)(?2-L)(LX) (L = alkyne, nitrile, imine, ketone). The tricarbonyl, alkyne, and imine complexes have been characterized by x-ray crystallography. The crystal structure of W(CO)(?2-N(Me)=C(H)(tol))(trop)2is consistent with a 4 electron donor configuration in which there is evidence for a W-N double bond and a W-C single bond. These chiral complexes show high diastereoselectivity when coordinating asymmetric imines and aldehydes and could prove useful for chiral functionalization reactions. The 4-electron donors will undergo ligand exchange in solution and the mechanism of this reaction has been probed by kinetics and DFT calculations. Several analogous Mo compounds have been synthesized and crystallographically characterized. Their structural and reaction chemistry will be contrasted with the W compounds. Replacement of the CO ligand by oxygen or phosphines will be reported as well.

W<sup>II</sup> and Mo<sup>II</sup> bis-tropolonate and bis-acetylacetonate compounds as chiral docking stations for p-coordinated nitriles and imines

248th National Meeting (2014)

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WII and MoII bis-tropolonate and bis-acetylacetonate compounds as chiral docking stations for p-coordinated nitriles and imines

W^II and Mo^II bis-tropolonate and bis-acetylacetonate compounds as chiral docking stations for p-coordinated nitriles and imines