Abstract
A new class of tripodal L(2)X ligands that feature three oxygen donors, namely the tris(2-oxo-1-tert-butylimidazolyl) and tris(2-oxo-1-methylbenzimidazolyl)hydroborato ligands, [To(Bu(t))] and [To(MeBenz)], has been synthesized via the reactions of NaBH(4) with the respective imidazolone. Structural and spectroscopic studies indicate that both [To(Bu(t))] and [To(MeBenz)] are significantly more sterically demanding but less electron donating than the related [O(3)] donor ligand, [CpCo{P(O)(OEt)(2)}(3)].
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