Abstract
Diastereotopic probes have been incorporated on the X ligands of M(AB) 2X 2, where AB is an unsymmetrical bidentate ligand. The complexes Ti(bzac) 2(O iC 3H 7) 2 and Ti(bzac) 2(2,6- iPr 2C 6H 3O) 2 have been prepared (bzac = anion of benzoylacetone) and their stereochemistry characterized by nuclear magnetic resonance spectroscopy. The complexes adopt the cis-X 2 geometry. These C 1-type complexes undergo terminal group exchange (and probably) in parallel with inversion of configuration. The latter, however, was not confirmed because of unresolved diastereotopic splittings. The averaging set for the rearrangement phenomena is identified as A″ 9 and the rearrangements are discussed in terms of twist motions about C 3 axes of the octahedral framework and bond rupture.
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