Search Results - "Vollhardt, K. Peter C."

Cobalt-Catalyzed Cyclotrimerization of Alkynes:  The Answer to the Puzzle of Parallel Reaction Pathways by Agenet, Nicolas, Gandon, Vincent, Vollhardt, K. Peter C, Malacria, Max, Aubert, Corinne

“…To understand some experimental data at odds with the computed mechanism of the CpCo(L2)-catalyzed [2 + 2 + 2] cyclotrimerization of ethyne, DFT computations…”
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Mechanism of Thermal Reversal of the (Fulvalene)tetracarbonyldiruthenium Photoisomerization: Toward Molecular Solar-Thermal Energy Storage by Kanai, Yosuke, Srinivasan, Varadharajan, Meier, Steven K, Vollhardt, K. Peter C, Grossman, Jeffrey C

“…A closer look at the title reaction pinpoints a surprising mechanism—a relatively rapid preequilibrium between cyclopentadienyl complex 2 and fulvalene…”
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Silicon−Hydrogen Bond Activation and Hydrosilylation of Alkenes Mediated by CpCo Complexes: A Theoretical Study by Gandon, Vincent, Agenet, Nicolas, Vollhardt, K. Peter C, Malacria, Max, Aubert, Corinne

“…Using DFT techniques, we show that triplet cyclopentadienylcobalt activates Si−H bonds to generate singlet silylcobalt hydrides without the intervention of…”
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Cobalt-Mediated Linear 2:1 Co-oligomerization of Alkynes with Enol Ethers to Give 1-Alkoxy-1,3,5-Trienes: A Missing Mode of Reactivity by Lebœuf, David, Iannazzo, Laura, Geny, Anaïs, Malacria, Max, Vollhardt, K. Peter C., Aubert, Corinne, Gandon, Vincent

“…A variety of 1,6‐heptadiynes and certain borylalkynes co‐oligomerize with enol ethers in the presence of [CpCo(C2H4)2] (Cp=cyclopentadienyl) to furnish the…”
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Cobalt(I)-Mediated Preparation of Polyborylated Cyclohexadienes: Scope, Limitations, and Mechanistic Insight by Geny, Anaïs, Lebœuf, David, Rouquié, Gabriel, Vollhardt, K. Peter C., Malacria, Max, Gandon, Vincent, Aubert, Corinne

“…A series of 1,3‐ and 1,4‐diboryl‐1,3‐cyclohexadienes have been prepared by intermolecular CoCp‐mediated [2+2+2] cocyclizations of alkynylboronic pinacolate…”
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Near-Quantitative Solid-State Synthesis of Carbon Nanotubes from Homogeneous Diphenylethynecobalt and -Nickel Complexes by Iyer, Vivekanantan S, Vollhardt, K. Peter C, Wilhelm, René

“…Free‐standing films of multiwalled carbon nanotubes (see scanning electron micrograph) encapsulating crystalline metal particles are obtained by the…”
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Total Syntheses and Structures of Angular [6]- and [7]Phenylene: The First Helical Phenylenes (Heliphenes) by Han, Sangdon, Bond, Andrew D, Disch, Raymond L, Holmes, Daniel, Schulman, Jerome M, Teat, Simon J, Vollhardt, K. Peter C, Whitener, Glenn D

“…Two plus two plus two times two: A double cobalt‐catalyzed cycloisomerization was used to convert appropriate hexaynes into hydrocarbons 1 and 2. Their X‐ray…”
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Total Syntheses of Angular [7]-, [8]-, and [9]Phenylene by Triple Cobalt-Catalyzed Cycloisomerization: Remarkably Flexible Heliphenes by Han, Sangdon, Anderson, D. Ryan, Bond, Andrew D, Chu, Hiufung V, Disch, Raymond L, Holmes, Daniel, Schulman, Jerome M, Teat, Simon J, Vollhardt, K. Peter C, Whitener, Glenn D

“…Six of the final cyclobutadiene rings in angular [8]phenylene and [9]phenylene (1) are closed in an unprecedented cobalt‐catalyzed triple cyclization of…”
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Cobalt-Mediated Cyclic and Linear 2:1 Cooligomerization of Alkynes with Alkenes:  A DFT Study by Gandon, Vincent, Agenet, Nicolas, Vollhardt, K. Peter C, Malacria, Max, Aubert, Corinne

“…The mechanism of the cobalt-mediated [2 + 2 + 2] cycloaddition of two alkynes to one alkene to give CpCo-complexed 1,3-cyclohexadienes (cyclic oligomerization)…”
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Tris(benzocyclobutadieno)triphenylene and Its Lower Biphenylene Homologues by Palladium-Catalyzed Cyclizations of 2,3-Didehydrobiphenylene by Iglesias, Beatriz, Cobas, Agustín, Pérez, Dolores, Guitián, Enrique, Vollhardt, K. Peter C

“…The Pd-catalyzed cycloaddition of didehydrobiphenylenes 2a,b, generated from the corresponding 3-(trimethylsilyl)-2-biphenylenyl triflates with fluoride,…”
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Photo-Thermal Haptotropism in Cyclopentadienylcobalt Complexes of Linear Phenylenes: Intercyclobutadiene Metal Migration by Albright, Thomas A., Dosa, Peter I., Grossmann, Tom N., Khrustalev, Victor N., Oloba, Oluwakemi A., Padilla, Robin, Paubelle, Renaud, Stanger, Amnon, Timofeeva, Tatiana V., Vollhardt, K. Peter C.

“…The CpCo‐shuffle: {CpCo} complexes of linear [3]‐ and [5]phenylene undergo a light‐induced haptotropic migration from a more strongly bound cyclobutadiene…”
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Competing Isomerizations of [12]Annulenes:  Diels−Alder Reaction versus Electrocyclization by Castro, Claire, Karney, William L, Noey, Elizabeth, Vollhardt, K. Peter. C

“…Experimentally, tri-trans-[12]annulene and tris(cyclohexeno)[12]annulene exhibit differing reactivities. Whereas the former, after isomerizing to its di-trans…”
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Cobalt-Mediated Synthesis of Angular [4]Phenylene:  Structural Characterization of a Metallacyclopentadiene(Alkyne) Intermediate and Its Thermal and Photochemical Conversion by Dosa, Peter I, Whitener, Glenn D, Vollhardt, K. Peter C, Bond, Andrew D, Teat, Simon J

“…The first X-ray crystal structure of a mononuclear metallacyclopentadiene(alkyne) complex has been obtained. This type of metallacycle is believed to be the…”
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X-ray Transient Absorption and Picosecond IR Spectroscopy of Fulvalene(tetracarbonyl)diruthenium on Photoexcitation by Harpham, Michael R., Nguyen, Son C., Hou, Zongrui, Grossman, Jeffrey C., Harris, Charles B., Mara, Michael W., Stickrath, Andrew B., Kanai, Yosuke, Kolpak, Alexie M., Lee, Donghwa, Liu, Di-Jia, Lomont, Justin P., Moth-Poulsen, Kasper, Vinokurov, Nikolai, Chen, Lin X., Vollhardt, K. Peter C.

“…Caught in the light: The fulvalene diruthenium complex shown on the left side of the picture captures sun light, causing initial Ru–Ru bond rupture to furnish…”
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The Thermal Retro[2+2+2]cycloaddition of Cyclohexane Activated by Triscyclobutenannelation: Concerted All-Disrotatory versus Stepwise Conrotatory Pathways to Fused [12]Annulenes by Eichberg, Michael J., Houk, K. N., Lehmann, Jürg, Leonard, Philip W., Märker, Anne, Norton, Joseph E., Sawicka, Dorota, Vollhardt, K. Peter C., Whitener, Glenn D., Wolff, Stefan

“…All dis or all con? While benzo analogues 2–4 undergo cycloreversion of the central cyclohexane ring by all‐disrotatory opening, the triscyclobutenocyclohexane…”
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Switching from Ru to Fe: picosecond IR spectroscopic investigation of the potential of the (fulvalene)tetracarbonyldiiron frame for molecular solar-thermal storage by Hou, Zongrui, Nguyen, Son C, Lomont, Justin P, Harris, Charles B, Vinokurov, Nikolai, Vollhardt, K Peter C

“…A foray into the exploration of Fe analogues of the (fulvalene)tetracarbonyldiruthenium [FvRu2(CO)4] solar-thermal storage system 1⇆2 is described. It was…”
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En Route to Dinitroacetylene: Nitro(trimethylsilyl)acetylene and Nitroacetylene Harnessed by Dicobalt Hexacarbonyl by Windler, G. Kenneth, Zhang, Mao-Xi, Zitterbart, Robert, Pagoria, Philip F., Vollhardt, K. Peter C.

“…Dinitroacetylene and other nitroacetylenes are attractive stoichiometric precursors to high energy‐density materials, but suffer from high reactivity and…”
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Synthesis of Fused Arylboronic Esters via Cobalt(0)-Mediated Cycloaddition of Alkynylboronates with α,ω-Diynes by Gandon, Vincent, Leca, Dominique, Aechtner, Tobias, Vollhardt, K. Peter C, Malacria, Max, Aubert, Corinne

“…Co2(CO)6-complexed alkynyl pinacolborane derivatives are readily transformed with functional group tolerance into fused arylboronates via the [2 + 2 +…”
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Single-Molecule-Resolved Structural Changes Induced by Temperature and Light in Surface-Bound Organometallic Molecules Designed for Energy Storage by Cho, Jongweon, Berbil-Bautista, Luis, Pechenezhskiy, Ivan V, Levy, Niv, Meier, Steven K, Srinivasan, Varadharajan, Kanai, Yosuke, Grossman, Jeffrey C, Vollhardt, K. Peter C, Crommie, Michael F

“…We have used scanning tunneling microscopy, Auger electron spectroscopy, and density functional theory calculations to investigate thermal and photoinduced…”
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Cobalt-Mediated [2+2+2] Cycloaddition versus CH and NH Activation of Pyridones and Pyrazinones with Alkynes: An Experimental Study by Aubert, Corinne, Betschmann, Patrick, Eichberg, Michael J., Gandon, Vincent, Heckrodt, Thilo J., Lehmann, Jürg, Malacria, Max, Masjost, Birgit, Paredes, Elisa, Vollhardt, K. Peter C., Whitener, Glenn D.

“…The reactivity of a range of pyridone and pyrazinone derivatives towards alkynes in the presence of cyclopentadienylcobaltbis(ethene) has been investigated…”
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