From Storable Sources of Atomic Nb and Ta Ions to Isolable Anionic Tris(1,3-butadiene)metal Complexes: [M(η4-C4H6)3], M=Nb, Ta


  • Highly Reduced Organometallics, Part 63. This work was supported by the U.S. National Science Foundation and the donors of the Petroleum Research Fund administered by the American Chemical Society, a predoctoral fellowship from the National Science Foundation (V.J.S.), and a University of Minnesota Doctoral Dissertation Fellowship (V.J.S.). We thank Christine Lundby for expert assistance in the preparation of this manuscript. Part 62: see Ref. [30].


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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.