Abstract
A series of rare-earth metal amides supported by a cyclohexyl-linked bis(β-diketiminato) ligand were synthesized, and their catalytic activities for hydrophosphonylation of aldehydes and ketones were developed. Reaction of [(Me3Si)2N]3RE(µ-Cl)Li(THF)3 with the cyclohexyl-linked bis(β-diketimine) H2L (1) (L = Cy[NC(Me)CHC(Me)NAr]2, Cy = cyclohexyl, Ar = 2, 6-i-Pr2C6H3) gave the rare-earth metal amides LREN(SiMe3)2 (RE = Nd(2), Sm(3), Dy(4), Er(5), Y(6)). All complexes were fully characterized by elemental, spectroscopic and single-crystal X-ray analyses. Investigation of the catalytic properties of the complexes reveals that these complexes exhibited a high catalytic activity towards the hydrophosphonylation of aldehydes and ketones in the presence of a very low loading of rare-earth metal amides (0.1–1 mol%) at room temperature in a short time.
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