3976-37-2Relevant academic research and scientific papers
Binuclear oxalamidinate complexes (MePd)2(oxam) and homoleptic complexes of the type [(THF)nLi4 (Me8)M2] and [(THF)4Li2 (Ph4)M] (M=Pd, Ni): Synthesis, structures and catalytic C-C linking reactions
Lamm, Katja,Stollenz, Michael,Meier, Mirko,G?rls, Helmar,Walther, Dirk
, p. 24 - 36 (2007/10/03)
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.
Aryl fluoride syntheses involving reactions of aryllead triacetates with boron trifluoride-diethyl ether complex
De Meio,Morgan,Pinhey
, p. 8129 - 8138 (2007/10/02)
Aryllead(IV) triacetates react at room temperature with BF3.Et2O to give the corresponding aryl fluoride in moderate to good yields; triarylboroxines, electron rich aryltrimethylsilanes and some arenes, which yield aryllead triacetates in acid catalysed reactions with lead tetraacetate, are converted directly into aryl fluorides when stirred with lead tetraacetate in BF3.Et2O. An investigation of the mechanism of the fluoro-deplumbation reaction indicates that it probably proceeds by acid catalysed heterolytic cleavage of the C-Pb bond to produce an aryl cation.
