Abstract
New dinuclear o-phenylene linked bis(amidinate) rare-earth metal alkyl complexes [{C6H4–1,2-(NCtBuNC6H5)2}RECH2SiMe3]2 (RE = Y (1), Er (2), Yb (3)) were synthesized in high yields. All complexes were established by single-crystal X-ray diffraction studies, which revealed that each bis(amidinate) ligand linked to two metal ions with one amidinate group coordinated to the metal ion in classical κ2-N,N’ modes, while the other amidinate group worked as a bridge coordination with the two metal ions in μ-κ2:κ1 chelating mode, resulting in the formation of amidinate group bridged dinuclear complexes. The complexes exhibited excellent catalytic reactivity for the Strecker reaction with wide range of unactivated imines under solvent-free conditions in presence of 1.0 mol% catalyst loading.
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