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Keywords:

  • Redox transmetallation;
  • Lanthanoid;
  • Trimethyltin reagents;
  • Pyrazolate;
  • Aryl oxide;
  • Ytterbium;
  • Europium

Abstract

Redox transmetallation reactions between trimethyltin compounds, SnMe3L [L = 3,5-diphenylpyrazolate (Ph2pz), 2,6-di-tert-butyl-4-methylphenolate (OAr), or C6F5] and lanthanoid metals have yielded [Ln(Ph2pz)2(DME)2] (Ln = Eu, Yb), [Ln(Ph2pz)3(DME)2] (Ln = Y, La, Nd, Eu), [Ln(Ph2pz)3(THF)3] (Ln = Nd, Sm), [Ln(Ph2pz)3(THF)2] (Ln = Y, Yb), [Sm(OAr)3(THF)], [Yb(OAr)2(THF)3], and [Yb(C6F5)2(THF)4] complexes in yields generally competitive with those from othermethods, and hexamethylditin. The crystal structures of [Nd(Ph2pz)3(DME)2]·DME, [Eu(Ph2pz)3(DME)2]·2DME, and [Sm(Ph2pz)3(THF)3]·3THF were determined. All have nine-coordination of the lanthanoid atom and three η2-Ph2pz ligands, the first two also having an η1- and an η2-DME ligand and the last having three THF ligands. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)