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Keywords:

  • alkene ligands;
  • arene ligands;
  • niobium;
  • subvalent compounds;
  • tantalum
Thumbnail image of graphical abstract

Hat trick: Homoleptic butadienemetalates of 4d and 5d metals have for the first time been structurally characterized. The niobium–naphthalene species [Nb(η4-C10H8)2(PMe3)2] functions as a useful source of “naked” Nb ions in its reaction with 1,3-butadiene to afford an unprecedented homoleptic niobium–butadiene complex [Nb(η4-C4H6)3] (see structure). The tantalum analogue [Ta(η4-C4H6)3] was obtained by a similar route.