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Publications 1991-1995

  1. B.T. Donovan, R.P. Hughes, H.A. Trujillo and A.L. Rheingold
    Steric Congestion in a Cyclopentadienyl Ligand Bearing t-Butyl
    Groups on Three Contiguous Carbon Atoms.
    Crystal and Molecular Structure of
    (η5-1,2,3-Tri-t-butylcyclopentadienyl)(η5-indenyl)rhodium(III)
    Hexafluorophosphate.
    Organometallics, 1992, 11, 64.
  1. O.J. Curnow, R.P. Hughes, and A.L. Rheingold
    An (η2–Tetrafluoroethylene)ruthenium Complex with a
    Metallacyclopropane Structure but with a Low Barrier to
    Propeller Rotation
    J. Am. Chem. Soc., 1992, 114, 3153.
  1. O.J. Curnow and R.P. Hughes
    [Ru(η5–C5Me5)(η5–C5F5): The First Transition Metal Complex
    Containing a Perfluorocyclopentadienyl Ligand
    J. Am. Chem. Soc., 1992, 114, 5895.
  1. B.T. Donovan, R.P. Hughes, A.S. Kowalski, H.A. Trujillo,
    and A.L. Rheingold
    Stereospecific Rhodium Promoted Ring Closure of an
    η4–1,3-Pentadienediyl Ligand to an η4–1,3-Cyclopentadiene, with
    Subsequent Stereo– and Regiospecific endo–H Migration:
    Molecular Structure of [Rh(η5-C5H5)(1–4η–C5H3–1,2,exo–5-tBu3)]
    Organometallics, 1993, 12, 1038.
  1. R.P. Hughes, H.A. Trujillo, and Arnold L. Rheingold
    α-C–H and α'-C–C Bond Cleavage in an Iridacyclohexadiene.
    Interchange of α–Hydrogen and α'–Phenyl Substituents without
    Accompanying Skeletal Rearrangement.
    J. Am. Chem. Soc., 1993, 115, 1583.
  1. D.E. Richardson, M.F. Ryan, W.E. Geiger, T.T. Chin, R.P. Hughes,
    and O.J. Curnow
    Gas-Phase and Solution Studies of the Oxidation of the
    First Perfluorocyclopentadienyl Complex [Ru(η5–C5Me5)(η5–C5F5)]
    Organometallics, 1993, 12, 613.
  1. D.L. Lichtenberger, M.L. Hoppe, L. Subramanian, E.M. Kober,
    R.P. Hughes, J.L. Hubbard, and D.S. Tucker,
    Electron Distribution and Bonding in η3–Cyclopropenyl Complexes
    Organometallics, 1993, 12, 2025.
  1. R. Ditchfield, R.P. Hughes, D.S. Tucker, E.P. Bierwagen,
    J. Robbins, D.J. Robinson, and J. A. Zakutansky
    Synthesis and Dynamic NMR Studies of η3–Triphenyl– and
    η3–Trimethylcyclopropenyl Complexes of Ruthenium,
    [Ru(η5-C5R5)(η3-C3R'3)X2] (R = H, Me; R' = Me, Ph; X = Cl, Br, I).
    Extended Hückel Molecular Orbital Study of Barriers to Rotation
    of η3-Cyclopropenyl Ligands in Isoelectronic Ruthenium
    and Molybdenum Complexes
    Organometallics, 1993, 12, 2258.
  1. R.P. Hughes, D.S. Tucker, and A.L. Rheingold
    Preparation and Dynamic Behavior of η3-Cyclopropenyl Complexes
    of Cobalt, Rhodium, and Iridium.
    Crystal and Molecular Structure of [Ir(η3–C3tBu3)(CO)3.
    Organometallics, 1993, 12, 3069.
  1. O.J. Curnow, R.P. Hughes, E.N. Mairs, and A. L. Rheingold
    Facile Propeller Rotation in Metallacyclopropanes.
    Synthesis and Dynamic Behavior of New
    Tetrafluoroethylene–Ruthenium Complexes.
    Crystal and Molecular Structure of [Ru(η5–C5Me5)Cl(η2–C2F4)]2
    Organometallics, 1993, 12, 3102.
  1. R.P. Hughes, P.R. Rose, and A. L. Rheingold
    Transition Metal Chemistry of Hexafluorobutadiene.
    Facile Hydrolysis of Hexafluoro-1-metalla-3-cyclopentene
    Rhodium Complexes to give
    Tetrafluoro-1-metalla-3-cyclopentene-2-one and
    Tetrafluoro-1-metalla-2-cyclopentene-4-one Complexes.
    Crystal and Molecular Structures of
    trans–[(Rh–CF2CF=CF–CO)Cl(PPh3)2],
    mer–[(Rh–CF2CF=CF–CF2)Cl(PMe3)3], and
    mer–[(Rh–CF=CF–CO–CF2)Cl(PMe3)3]
    Organometallics, 1993, 12, 3109.
  1. J.-K. Shen, D.S. Tucker, F. Basolo, and R.P. Hughes
    Kinetics of CO Substitution in Reactions of η3-Cyclopropenyl
    Complexes of Iron, Cobalt, Rhodium, and Iridium with Phosphorus
    Ligands. The First Examples of a Dissociative Mechanism
    for CO Substitution in the Cobalt Triad Carbonyl Complexes
    J. Am. Chem. Soc., 1993, 115, 11312.
  1. R. P. Hughes and D. S Tucker
    η3–Cyclopropenyl is Isolobal with NO, but not with 
    η3–Propenyl (Allyl): Evidence from Conformational Preferences and Rotational Barriers in Alkene and Alkyne Complexes of Iridium.
    Organometallics, 1993, 12, 4736.
  1. R.P. Hughes, A. S. Kowalski, and B. T. Donovan
    Unusual Rhodium Promoted Reaction of a Vinylcyclopropene
    to give a Cyclobutadiene Ligand.
    Formation of (η5–Pentamethylcyclopentadienyl)-
    [η4–Tri-t-butyl(methyl)cyclobutadiene]rhodium.
    J. Organomet. Chem., 1994, 472, C18.
  1. R. P. Hughes, X. Zheng, R. L. Ostrander, and A. L. Rheingold
    Synthesis and Molecular Structure of [Ru(η5–C5H5)(η5–C5F5)].
    Intramolecular Structural Comparison of the Cyclopentadienyl
    Ligand with its Perfluorinated Analogue.
    Organometallics, 1994, 13, 1567.
  1. R.P. Hughes, A. S. Kowalski, J. R. Lomprey, and A.L. Rheingold
    Preparation of the 1,2-di–tert–Butylcyclopentadienyl Anion
    and a Transition Metal Derivative.
    Crystal Structure of 1,1',2,2'-tetra-tert-butylferrocene.
    Organometallics, 1994, 13, 2691.
  1. R. P. Hughes,  O. J. Curnow, E.N. Mairs, P. R. Rose, X. Zheng,
    and A. L. Rheingold
    New and Revisited Transition Metal Chemistry of
    Fluoro-Olefins and Fluoro-Dienes
    Adv. Chem. Ser., 1994, 515, 252.
  1. R.P. Hughes, D.S. Tucker, and A.L. Rheingold
    Reversible Insertion of Iridium into a Cyclopropenyl
    Carbon–Carbon Bond
    Organometallics, 1994, 13, 4664.
  1. B. T. Donovan, R. P. Hughes, P. P. Spara, and A. L. Rheingold
    Unusual Chloropalladation of
    1,2,3-Tri-tert-butyl-3-vinyl-1-cyclopropene to give an
    η3-Chloromethylcyclobutenyl Ligand. Crystal and Molecular
    Structures of Di-μ-chlorobis[(1–3η)-4-endo-chloromethyl-1,2,3-
    tri-tert-butylcyclobutenyl]dipalladium and
    Tetra-μ-chlorobis[(1–3η)-4-endo-chloromethyl-1,2,3-
    tri-tert-butylcyclobutenyl]tripalladium.
    Organometallics, 1995, 14, 489.
  1. R.P. Hughes, P. R. Rose, X. Zheng, and A. L. Rheingold
    Synthesis and Molecular Structure of the First Example of an
    η4–Complex of Hexafluorobutadiene: [RuCl(η5–C5Me5)(η4–C4F6)].
    Structural Comparison of Coordinated Butadiene and its
    Perfluorinated Analogue.
    Organometallics, 1995, 14, 2407.
  1. R. P. Hughes, H. A Trujillo, and A. J. Gauri
    Stereoselective Ring Expansion of 3–Vinyl–1–cyclopropenes
    to Give η5–Cyclopentadienyl(ruthenium)
    and η4–Cyclohexadienone(iron) Complexes.
    Exclusion of Planar Metallacyclohexadiene
    Intermediates and Relevance to the Dötz Reaction.
    Organometallics, 1995, 14, 4319.
  1. R.P. Hughes and J.R. Lomprey
    Tin and Thallium Reagents for Transfer of the
    1,2‑di‑tert‑Butylcyclopentadienyl Ligand to Transition Metals.
    Inorg. Chim. Acta, 1995, 240, 653.