Rich C-H bond activations of yttrium alkyl complexes bearing phosphinimino-amine ligands

作者:Li, DF;Li, SH;Cui, DM;Zhang, XQ
关键字:C-H bond activation,Yttrium alkyl complex,Phosphinimino-amine,Polymerization

A series of phosphinimino-amine compounds (2,6–iPr2–C6H3NH)C(Me)CHPPh2(NAr) (Ar = 2,6–iPr2–C6H3 (HL1), 2,6–Et2–C6H3 (HL2), 2,6–Me2–C6H3 (HL3), C6H5 (HL4), 3–CF3–C6H4 (HL5)) that existed in imine and amine forms were synthesized and fully characterized. Treatment of HL1?5 with Y(CH2SiMe3)3(THF)2 afforded the corresponding yttrium mono- or bis(alkyl) complexes that depended significantly on the ancillary ligands. The reactions between HL1?3 and Y(CH2SiMe3)3(THF)2 at room temperature generated mononuclear monoalkyl complexes 1–3 via deprotonation and C–H bond activation. However, when compounds HL4,5 were used, the dialkyl complexes 4 and 5 were isolated by deprotonation only. The molecular structures of complexes 1–4 were characterized with X-ray crystallography and discussed.