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Intermediates in the Catalytic Dehydrogenative Coupling of Arylgermanes
Chemistry: A European Journal
  • John E. Bender, Brown University
  • Kyle E. Litz, University of Michigan-Ann Arbor
  • Dimitri Giarikos, Baldwin-Wallace College
  • Norman J. Wells, Baldwin-Wallace College
  • Mark M. Banaszak, University of Michigan-Ann Arbor
  • Jeff W. Kampf, University of Michigan-Ann Arbor
Publication Date
  • Dehydrogenative coupling,
  • Germanium,
  • Platinum,
  • Reaction mechanisms,
  • Structure elucidation
The use of a new electron-withdrawing germane, H2Ge[3,5-(CF3)2C6H3]2 (3), has facilitated the isolation and characterization of three new complexes implicated in the dehydrogenative coupling of bisarylgermanes by Pt0-phos-phane complexes. The intermediates include a digermyl species, trans-[(Et3P)2Pt{GeH(Ar)2}2] (7), a bound digermane showing the first stage of Ge-Ge catenation, cis-[(Et3P)2Pt(H){Ge(Ar)2-GeH(Ar)2}] (8), and the Ge-H activated form of this product, [(Et3P)2HPtGe(Ar)2-Ge(Ar)2PtH(PEt3)2] (6). Complexes such as 6 and 8 have not previously been isolated as intermediates in dehydrogenative coupling reactions. An X-ray crystal structure was determined for complex 6, confirming the cis geometry of the hydrogen and germanium ligands; this provides yet another example of the stability of germyl hydrides towards reductive elimination. A similar cis geometry was observed for complex 8. Performing the dehydrogenative coupling reaction under a CO2 atmosphere failed to yield any products containing trapped germylene species.

©WiLEY-VCH Verlag GmbH, 69451 Weinheim 1997

Citation Information
John E. Bender, Kyle E. Litz, Dimitri Giarikos, Norman J. Wells, et al.. "Intermediates in the Catalytic Dehydrogenative Coupling of Arylgermanes" Chemistry: A European Journal Vol. 3 Iss. 11 (1997) p. 1793 - 1796 ISSN: 0947-6539
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