Publications 1986-1990

R.P. Hughes, J.M.J. Lambert, D.W. Whitman, J.L. Hubbard,
W.P. Henry, and A.L. Rheingold,
Reactions of Cyclopropenyl Cations with
Tricarbonylnitrosylferrate(-1),Tetracarbonylcobaltate(-1),
and Octacarbonyldicobalt.
Synthesis and Conformational and Configurational Stabilities of
η3-Cyclopropenyl and η3-Oxocyclobutenyl Complexes
of Iron and Cobalt. Crystal and Molecular Structure of
Fe(η-C3Ph2tBu)(CO)2NO.
Organometallics, 1986, 5, 789.

R.P. Hughes, J.M.J. Lambert, and J.L. Hubbard,
Reactions of Cyclopropenyl Iron Complexes with Exogenous Ligands.
Competition Between Carbonyl Ligand Substitution and
Cyclopropenyl Migration to CO Followed by Ring Expansion to give
η3-Oxocyclobutenyl Ligands.
Organometallics, 1986, 5, 797.

R.P. Hughes, R.T. Carl, R.C. Hemond, D.E. Samkoff,
and A.L. Rheingold,
Unprecedented Coordination of a Cyclooctatetraene Ligand.
Synthesis and Crystal and Molecular Structure of
(η-Pentamethylcyclopentadienyl)(1,4-η-octafluorocyclo-
octatetraene)(trimethylphosphine)rhodium(III)
J. Chem. Soc. Chem. Commun., 1986, 306.

R.P. Hughes, R.T. Carl, D.E. Samkoff, R.E. Davis,
and K.D. Holland,
Transition Metal Chemistry of Octafluorocyclooctatetraene.
Synthesis and X-ray Structure of a Novel Five Coordinate
cis-Dialkyl Nickel Complex.
Organometallics, 1986, 5, 1053.

R.C. Hemond, R.P. Hughes, and H.B. Locker,
Competitive C–H and C–C Activation in the Reaction of
Pentamethylcyclopentadiene with Decacarbonyldimanganese.
Organometallics, 1986, 5, 2391.

N.A. Grabowski, R.P. Hughes, B.S. Jaynes, and A.L. Rheingold,
Stepwise Transition Metal Promoted Ring Expansion Reactions
of Vinylcyclopropenes to Give Cyclopentadienes and
Cyclohexa-2,4-dienones. The First Example of a
1-Metallacyclohexadiene Complex,
{[Pt–CH2–CH=C(Ph)–C(Ph)=C(Ph)](PPh3)2}.
J. Chem. Soc. Chem. Commun., 1986, 1694.

W.P. Henry and R.P. Hughes,
Organic Synthesis Using Carbon Monoxide.
Regiospecific Cobalt Mediated Synthesis of 2H-Pyran-2-ones.
J. Am. Chem. Soc., 1986, 108, 7862.

R. T. Carl, S.J. Doig, W.E. Geiger, R.C. Hemond, R.P. Hughes,
R.S. Kelly, and D.E. Samkoff
Pentamethylcyclopentadienyl Cobalt and Rhodium Complexes of
Octafluorocyclooctatetraene. Photochemical and Thermal
Interconversion of 1,2,5,6-η- and 1,2,3,6-η-C8F8 Isomers.
Electrochemical and ESR Characterization of the
19–Electron Radical Anion [Co(η-C5Me5)(1,2,5,6-η-C8F8)]–.
Organometallics, 1987, 6, 611.

J.W. Egan, Jr., R.P. Hughes, and A.L. Rheingold,
Transition Metal Promoted Ring Opening Reactions of
Vinylcyclopropenes. 1,2,3,5-η-Pentadienediyl and
1,5-η-Pentadienediyl [1-Metallacyclohexa-2,4-diene]
Complexes of Rhodium(III) and Iridium(III) and Their Conversion
to η5-Cyclopentadienyl(hydrido) Metal Compounds.
Organometallics, 1987, 6, 1578.

J.J. BelBruno, P.B. Kobsa, R.T. Carl, and R.P. Hughes,
Competition Between Radiative Pumping and Nonradiative Processes
in the Multiphoton Dissociation of Organometallic Iron Complexes.
J. Phys. Chem., 1987, 91, 6168.

R.T. Carl, R.P. Hughes, J.A. Johnson, R.E. Davis, and R. Kashyap,
Unprecedented Bonding of a Coordinated Polyenyl Ligand.
Synthesis and Molecular Structures of
fac-(Trialkyl)(tricarbonyl)iron Compounds Containing the
η3-Nonafluorocycloocta-2,5-diene-1,4,7-triyl Ligand
and its Derivatives
J. Am. Chem. Soc., 1987, 109, 6875.

J.J. BelBruno, S.R. Greenfield, R.T. Carl, and R.P. Hughes,
Competition Among Collisional Deactivation, Ionization, and
Dissociation in the Multiphoton Excitation of
Octafluorocyclooctatetraene.
J. Phys. Chem., 1988, 92, 2480.

R.C. Hemond and R.P. Hughes,
The First Transition Metal Complex Containing a Coordinated
Vinylcyclopropene and its Photochemical Ring Expansion
to Give an η4-Cyclobutadiene Ligand.
J.Chem. Soc. Chem. Commun., 1988, 319.

R.T. Carl, R.P. Hughes, A.L. Rheingold, T.B. Marder,
and N.J. Taylor
Synthesis, Structures, and Solution Dynamics of Mononuclear
and Dinuclear η5–Indenylrhodium Complexes of
Octafluorocyclooctatetraene.
Crystal and Molecular Structures of
[Rh(η5–C9H7)(1,2,5,6–η–C8F8)],
{[Rh(η5–C9H7)]2[μ–(1,5,6–h:2–4–η–C8F8)](Rh–Rh)},
{[Rh(η5–C9H7)]2[μ–(1,5,6–h:2–4–η–C8F7H)](Rh–Rh)}, and
{[Rh(η5–C9H7)(CO)][Rh(η5–C9H7)][μ–(1,2,5,6–η:7,8–η–C8F8]}.
Organometallics, 1988, 7, 1613.

R.T. Carl, R.P. Hughes, and D.E. Samkoff
Transannular Ring-Closure Reactions of
Octafluorocyclooctatetraene Coordinated to Cobalt and Rhodium
Centers. Ligand Induced Formation of
η2–Octafluorocycloocta-2,5,7-triene-1,4-diyl and
η2–Octafluorobicyclo[3.3.0]octa-2,7-diene-4,6-diyl Complexes of
Cobalt(III) and Rhodium(III).
Organometallics, 1988, 7, 1625.

R.C. Hemond, R.P. Hughes, D.J. Robinson, and A.L. Rheingold
Activation of a Fluorinated Carbon-Carbon Bond by
Oxidative Addition of Tetrafluorocyclopropene to Platinum(0).
The First Example of a Perfluorometallacyclobutene.
Organometallics, 1988, 7, 2239.

R.P. Hughes, J. Robbins, D.J. Robinson, and A.L. Rheingold
Conformationally Rigid η3-Cyclopropenyl Complexes
of Ruthenium(IV).
Crystal and Molecular Structure of [Ru(η5-C5H5)(η3-C3Ph3)Br2].
Organometallics, 1988, 7, 2413.

R.P. Hughes and D.J. Robinson,
Transition Metal Promoted Activation of Carbon-Carbon Bonds.
A New Synthetic Route to Substituted Ruthenocene Derivatives
via Ring Expansion Reactions of 3-Vinyl-1-cyclopropenes.
Organometallics, 1989, 8, 1015.

R.C. Hemond, R.P. Hughes, and A.L. Rheingold,
Synthesis of η6–Octafluorocyclooctatetraene and
η6–Cyclooctatetraene Complexes of Manganese(I).
Molecular Structures of [Mn(η5-C5R5)(η6-C8X8)]
(R = H, Me; X = F: R = Me; X = H).
Organometallics, 1989, 8, 1261.

R.P. Hughes, M.E. King, D.J. Robinson, and J.M Spotts
Stereoselective Oxidative Additions of a Carbon–Carbon σ-Bond in
Tetrafluorocyclopropene to Iridium(I) Complexes.
J. Am. Chem. Soc., 1989, 111, 8919.

R.T. Carl, E.W. Corcoran Jr, R.P. Hughes, and  D.E. Samkoff
Nickel, Palladium, and Platinum Complexes Derived From
Octafluorocyclooctatetraene. Synthesis of
1,2,5,6-η–Octafluorocyclooctatetraene Complexes of Nickel(0) and
η2–Octafluorobicyclo[3.3.0]octa-2,7-diene-4,6-diyl Complexes of
Nickel(II), Palladium(II) and Platinum(II)
Organometallics, 1990, 9, 838.

R.P. Hughes
Organo-Transition Metal Compounds Containing
Perfluorinated Ligands:
Adv. Organomet. Chem., 1990, 31, 183.

B.T. Donovan, J.W. Egan, Jr., R.P. Hughes, P.P. Spara,
H.A. Trujillo, and A.L. Rheingold
Reversible Carbon–Carbon Bond Cleavage of a
3-Vinyl–1–Cyclopropene by Rh(I). Molecular Structures of
Two Sterically Crowded 1,2,3,5–η–Pentadienediyl Complexes
of Rhodium(III)
Isr. J. Chem., 1990, 30, 351.

R.P. Hughes, R.T. Carl, S.J. Doig, R.C. Hemond, D.E. Samkoff,
W.L. Smith,L.C. Stewart, R.E. Davis, K.D. Holland, P. Dickens,
and R.P. Kashyap
Effect of Polyfluorination on Ring Inversion Barriers for
Cyclooctatetraenes.
Synthesis of Heptafluorocycloocta-1,3,5,7-tetraenyl,
Hexafluorocycloocta-1,3,5,7-tetraenediyl,
Heptafluorotricyclo[4.2.0.02,5]octa–3,7–dienyl, and
Hexafluorotricyclo[4.2.0.02,5]octa–3,7–diendiyl
Transition Metal Compounds. Crystal and Molecular Structures of
[Fe(η–C5R5)(η1–Heptafluorocycloocta-1,3,5,7-tetraenyl)(CO)2]
{R = H, Me},
{[Fe(η–C5H5)(CO)2]2(μ2–1h,5h–Hexafluorocycloocta-1,3,5,7-
tetraenediyl)}, and
[Mn(3η–Heptafluorotricyclo[4.2.0.02,5]octa–3,7–dienyl)(CO)5].
Organometallics, 1990, 9, 2732.

R.P. Hughes, S.J. Doig, R.C. Hemond, W.L. Smith, R.E. Davis,
S.M. Gadol, and K.D. Holland
Synthesis, Structures, and Conformational Dynamics of Dicobalt
Complexes Containing the Hexafluorodehydrocyclooctatetraene
(Hexafluorocycloocta-3,5,7-trien-1-yne) Ligand.
Crystal and Molecular Structures of [(Co(L)(CO)2)2(μ2-1η,2η-C8F6)]
{L = CO, PPh3, PPhMe2, PMe3}.
Organometallics, 1990, 9, 2745.

B.T. Donovan, R.P. Hughes, and H.A. Trujillo
Mechanism of Rhodium–Promoted Conversion of
3–Vinyl–1–cyclopropenes to 1,3–Cyclopentadienes.
Stereochemistry of the Carbon–Carbon Bond Forming Step.
J. Am. Chem. Soc., 1990, 112, 7076.