Organolanthanoids XX . The synthesis of YbCp2Cl(THF)0.5 (Cp = cyclopentadienyl; THF = tetrahydrofuran), YbCp2X(THF) (X = Br or I), and (YbCp2X)2 (X = Cl, Br, or I) by oxidation of YbCp2 with metal and organic halides

Glen B. Deacon, Stuart C. Harris, Gerd Meyer, Dirk Stellfeldt, Dallas L. Wilkinson, Gerd Zelesny

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Reaction of YbCp2(DME) (Cp = cyclopentadienyl; DME = 1,2-dimethoxyethane) with MCl2 (M = Hg, Cd, Zn, Pb, Sn, Cu, Pd, or Co) or MCl (M = Ag, Cu or Tl) in tetrahydrofuran (THF) gives the metal M and YbCp2Cl(THF)0.5, generally in excellent yield, with small amounts of TlCp and CoCp2 also detected from TlCl and CoCl2 respectively. Similarly, YbCp2X(THF) (X = Br or I) and YbCp2Cl(DME)0.5 have been prepared in good yields by analogous oxidation with suitable mercury(II) halides. However YbCp2(DME) and FeCl3 yield ferrocene. In simpler syntheses, YbCp2X(THF)n (X = Cl, n = 0.5; X = Br or I, n = 1) have been obtained by reactions of YbCp2(DME) with C2Cl6 or (CH2X)2 (X = Br or I) in THF, and (YbCp2X)2 by analogous reactions of unsolvated YbCp2 in petroleum ether. The X-ray crystal structure of YbCp2I(THF) (monoclinic, P21/c, a = 8.147(1), b = 13.788(2), c = 14.149(3)Å, β = 105.56(1)°, Z = 4, R = 0.042, for 2324 observed data) shows the complex to be monomeric with formal eight coordination for ytterbium, and with a pseudo-tetrahedral array of the centroids of the Cp rings, oxygen, and iodine ( 2.565 Å, Yb-O 2.311(5)Å, Yb-I 2.9316(7)Å).

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalJournal of Organometallic Chemistry
Issue number1-2
Publication statusPublished - 15 Nov 1996


  • Crystal structure
  • Cyclopentadienyl
  • Lanthanide
  • Oxidation
  • Rare earth
  • Ytterbium

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