Hydrogenation of C=C and C=N Bonds of the Amide-Imine Ligand in the Metal Coordination Sphere in the Reaction of Yttrium Bis(alkyl) Complex [2,6-iso-Pr2C6H3NC(=CH2)C(Me)=NC6H3-iso-Pr2-2,6]Y(CH2SiMe3)2(THF) with Molecular Hydrogen

Abstract

On treatment of the yttrium bis(alkyl) complex [ArNC(=CH₂)C(Me)=NAr]Y(CH₂SiMe₃)₂(THF) (I, Ar = C₆H₃-iso-Pr₂-2.6) containing an amide-imine ligand, with molecular hydrogen, hydrogenation of the C=N and C=C bonds takes place along with hydrogenolysis of Y−C bonds. The reaction is also accompanied by redistribution of nitrogen ligands and results in the formation of the yttrium complexes [ArNCH(Me)CH(Me)NAr]Y[ArN(=CH₂)CH(Me)N(H)Ar](THF) (II^MeMe) and [ArNCH(Me)-C(=CH₂)NAr]Y[ArN(=CH₂)CH(Me)N(H)Ar](THF) containing, the monoanionic ene-amide-amine moiety [ArNC(=CH₂)CH(Me)N(H)Ar]⁻, together with the dianionic diamide ligands [ArNCH(Me)CH(Me)NAr]²⁻ or [ArNCH(Me)C(=CH₂)NAr]²⁻ (CIF file CCDC no. 1873206).