Journal of Organometallic Chemistry p. 24 - 36 (2003)
Update date:2022-08-04
Topics:
Lamm, Katja
Stollenz, Michael
Meier, Mirko
G?rls, Helmar
Walther, Dirk
The dinuclear methyl complexes 1 and 2 of the type [CH3 -Pd(oxam)Pd-CH3] were obtained by reaction of (COD)PdCH3(Cl) with the corresponding dilithium oxalic amidinates, prepared from LiBu and the oxalic amidines H2Y or H2Z (H2Y= N,N′-bis(2-pyridylethyl)-1, 2-bis-(2,4,6-trimethylphenyl-imino)-ethane-1,2-diamine; H2 Z = N,N ′-bis(diphenylphosphino-3-propyl)-1,2-bis-(2,4, 6-trimethylphenyl-imino)-ethane-1,2-diamine). Reaction of both 1 and 2 with an excess of LiCH3 results in the formation of the dimeric compound [(THF)4Li4(CH3) 8Pd2] (3). Similarly, monomeric phenyl complexes of the composition [(THF)4Li2M(C6 H5)4] (M=Pd (4), Ni (5)) were prepared. The complexes were characterized by elemental analysis, mass spectroscopy, 1H-NMR, 13C-NMR and 7Li-NMR spectroscopy, and by X-ray single-crystal diffraction analysis in the solid state. All complexes contain the metals in a planar-square environment. Compounds 1-3 and 4 are highly active, selective and long-living catalysts in the Heck reaction of 4-bromoacetophenone and n-butyl acrylate. Compound 5 and the related neutral ligand-free Ni complex [(THF)4Li4(CH3)8 Ni2] (6) are active catalysts for the Kumada cross-coupling of MesitylMgBr with 4-bromotoluene and are even able to couple the corresponding aryl chloride or aryl fluoride with MesitylMgBr.
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