Abstract
The reduced 2,2′-bipyridine thorium-bis(NHC)borate mesityl complex (2) reacts with either propylene oxide or cyclohexene oxide to form ring-opened addition products 3 and 4, respectively. This C−O bond cleavage event proceeds cleanly and affords well-defined products (3 and 4) that have been characterized by NMR, IR, and UV–Vis spectroscopy. In the case of 3, single crystal X-ray diffraction was also performed. The synthesis and characterization of a new reduced 6,6′-dimethyl-2,2′-dipyridyl thorium-bis(NHC)borate mesityl complex (5) is also described. The steric congestion present in complex 5 leads to divergent reactivity to that of 2. Instead of the clean bond making and breaking reactivity demonstrated by 2 with various organic substrates such as tert-butyl isocyanide, propylene oxide, benzophenone, and p-tolylazide, complex 5 either does not react, or succumbs to decomposition.
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