摘要:
The reaction of carbon monoxide with a beta-diketiminato dimethyl niobium complex (BDI)Me(2)Nb(N(t)Bu) is shown to lead to a variety of products whose distribution displays a remarkable dependence on the reaction conditions. Among these, the products of metal reduction, enediolate formation, and intramolecular C-H activation have been fully characterized. An investigation into the individual steps leading to these products points to a transient initial monoacyl complex, whose fate may be perturbed via reaction conditions to allow for control over the product distribution. Furthermore, the reaction of (BDI) Me(2)Nb(NCMe(3)) with XylNC (Xyl = 2,6-Me(2)C(6)H(3)) yields the eta(2)-ketimine complex (BDI)(Me(2)C=NXyl)Nb(NCMe(3)), whose characterization and reactivity enhance our understanding of the sequences involving CO.