Organoamido- and Aryloxo-Lanthanoids, 23 Aryl Ether C-O Bond Activation by Organoamidolanthanoid(II) Complexes

摘要

The reaction of ytterbium metal, HgPh_2 and N-(2-methoxy-phenyl)-N-(trimethylsilyl)amine (L~1H) or N-(2-phenoxy-phenyl)-N-(trimethylsilyl)amine (L~2H) in tetrahydrofuran (thf) unexpectedly yielded the ytterbium(III) complexes [Yb(L~1)_2(#mu#-OMe)]_2 (1) and [Yb(L~2)_2(OPh)(thf)](2), the structures of which were established by X-ray crystallography. These are considered to be derived from C-O bond cleavage of the ligand aryl ether moiety by an initially formed Yb~(II) species, e.g. the thermally unstable, but crystallographically authenticated [Yb(L~1)_2(thf)_2] (3), which was independently prepared from [Yb{N(SiMe_3)_2}_2(thf)_2] and L~1H.