Synthesis and structural characterization of tris(2-oxo-l-terf butylimidazolyl) and tris(2-oxo-l-methylbenzimidazolyl)hydroborato complexes: a new class of tripodal oxygen donor ligand

摘要

A new class of tripodal L2X ligands that feature three oxygen donors, namely the tris(2-oxo-l-terf-butylimidazolyl) and tris (2-oxo-l-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].