K. Peter C. Vollhardt

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Name: Vollhardt, K. Peter C.; K. Peter C. Vollhardt

Organization: University of California at Berkeley , USA

Department: Department of Chemistry

Title: (PhD)

TOPICS

Inorganic Chemistry

Chemicals
References

A Terminal, Fluxional 4-Benzene Complex with a Thermally Accessible Triplet State is the Primary Photoproduct in the Intercyclobutadiene Haptotropism of (CpCo)phenylenes

Co-reporter:Dr. Thomas A. Albright;Rima Drissi;Dr. Vincent Gon;Ser Oldenhof;Dr. Oluwakemi A. Oloba-Whenu;Dr. Robin Padilla;Dr. Hao Shen;Dr. K. Peter C. Vollhardt;Vincent Vreeken

Chemistry - A European Journal 2015 Volume 21( Issue 12) pp:4546-4550

Publication Date(Web):

DOI:10.1002/chem.201406211

Abstract

Low-temperature irradiation of linear [3]- and [4]phenylene cyclopentadienylcobalt complexes generates labile, fluxional η⁴-arene complexes, in which the metal resides on the terminal ring. Warming induces a haptotropic shift to the neighboring cyclobutadiene rings, followed by the previously reported intercyclobutadiene migration. NMR scrutiny of the primary photoproduct reveals a thermally accessible 16-electron cobalt η²-triplet species, which, according to DFT computations, is responsible for the rapid symmetrization of the molecules along their long axes. Calculations indicate that the entire haptotropic manifold along the phenylene frame is governed by dual-state reactivity of alternating 18-electron singlets and 16-electron triplets.

Inside Back Cover: A Terminal, Fluxional 4-Benzene Complex with a Thermally Accessible Triplet State is the Primary Photoproduct in the Intercyclobutadiene Haptotropism of (CpCo)phenylenes (Chem. Eur. J. 12/2015)

Co-reporter:Dr. Thomas A. Albright;Rima Drissi;Dr. Vincent Gon;Ser Oldenhof;Dr. Oluwakemi A. Oloba-Whenu;Dr. Robin Padilla;Dr. Hao Shen;Dr. K. Peter C. Vollhardt;Vincent Vreeken

Chemistry - A European Journal 2015 Volume 21( Issue 12) pp:

Publication Date(Web):

DOI:10.1002/chem.201590045

Exploring the Potential of Fulvalene Dimetals as Platforms for Molecular Solar Thermal Energy Storage: Computations, Syntheses, Structures, Kinetics, and Catalysis

Co-reporter:Dr. Karl Börjesson;Dr. Du&x161;an &x106;oso;Victor Gray;Dr. Jeffrey C. Grossman;Dr. Jingqi Guan;Dr. Charles B. Harris;Dr. Norbert Hertkorn;Dr. Zongrui Hou;Dr. Yosuke Kanai;Dr. Donghwa Lee ;Justin P. Lomont;Dr. Arun Majumdar;Dr. Steven K. Meier;Dr. Kasper Moth-Poulsen;Dr. Ry L. Myrabo;Son C. Nguyen;Dr. Rachel A. Segalman;Dr. Varadharajan Srinivasan;Dr. Willam B. Tolman;Dr. Nikolai Vinokurov;Dr. K. Peter C. Vollhardt;Dr. Timothy W. Weidman

Chemistry - A European Journal 2014 Volume 20( Issue 47) pp:15587-15604

Publication Date(Web):

DOI:10.1002/chem.201404170

Abstract

A study of the scope and limitations of varying the ligand framework around the dinuclear core of FvRu₂ in its function as a molecular solar thermal energy storage framework is presented. It includes DFT calculations probing the effect of substituents, other metals, and CO exchange for other ligands on ΔH_storage. Experimentally, the system is shown to be robust in as much as it tolerates a number of variations, except for the identity of the metal and certain substitution patterns. Failures include 1,1′,3,3′-tetra-tert-butyl (4), 1,2,2′,3′-tetraphenyl (9), diiron (28), diosmium (24), mixed iron-ruthenium (27), dimolybdenum (29), and ditungsten (30) derivatives. An extensive screen of potential catalysts for the thermal reversal identified AgNO₃–SiO₂ as a good candidate, although catalyst decomposition remains a challenge.

Switching from Ru to Fe: picosecond IR spectroscopic investigation of the potential of the (fulvalene)tetracarbonyldiiron frame for molecular solar-thermal storage

Co-reporter:Zongrui Hou, Son C. Nguyen, Justin P. Lomont, Charles B. Harris, Nikolai Vinokurov and K. Peter C. Vollhardt

Physical Chemistry Chemical Physics 2013 vol. 15(Issue 20) pp:7466-7469

Publication Date(Web):02 Apr 2013

DOI:10.1039/C3CP51292D

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 facilitated by the development of a convenient synthetic access to the parent [FvFe2(CO)4] 3a and the more soluble di(tert-butyl)fulvalene derivatives 3c and d. Laboratory time scale irradiations (>400 nm) fail to induce photoisomerization, an observation that is explained by the results of time-resolved IR experiments. They show that photoexcitation generates only the short-lived singlet syn biradical of 3 (and a small amount of decarbonylation product), in the absence of the corresponding triplet species required for the occurrence of rearrangement to 4.

X-ray Transient Absorption and Picosecond IR Spectroscopy of Fulvalene(tetracarbonyl)diruthenium on Photoexcitation

Co-reporter:Dr. Michael R. Harpham;Son C. Nguyen;Dr. Zongrui Hou;Dr. Jeffrey C. Grossman;Dr. Charles B. Harris;Michael W. Mara;Dr. Andrew B. Stickrath;Dr. Yosuke Kanai;Dr. Alexie M. Kolpak;Dr. Donghwa Lee;Dr. Di-Jia Liu;Justin P. Lomont;Dr. Kasper Moth-Poulsen;Dr. Nikolai Vinokurov;Dr. Lin X. Chen;Dr. K. Peter C. Vollhardt

Angewandte Chemie International Edition 2012 Volume 51( Issue 31) pp:7692-7696

Publication Date(Web):

DOI:10.1002/anie.201202952

En Route to Dinitroacetylene: Nitro(trimethylsilyl)acetylene and Nitroacetylene Harnessed by Dicobalt Hexacarbonyl

Co-reporter:Dr. G. Kenneth Windler;Dr. Mao-Xi Zhang;Robert Zitterbart;Dr. Philip F. Pagoria; K. Peter C. Vollhardt

Chemistry - A European Journal 2012 Volume 18( Issue 21) pp:6588-6603

Publication Date(Web):

DOI:10.1002/chem.201200473

Abstract

Dinitroacetylene and other nitroacetylenes are attractive stoichiometric precursors to high energy-density materials, but suffer from high reactivity and thermal instability. Herein, we report that nitroacetylenes can be dramatically stabilized in the form of their dicobalt hexacarbonyl complexes. In particular, we describe the syntheses and characterization of the first two transition-metal complexes of nitroalkynes, [μ-1-nitro-2-(trimethylsilyl)ethyne-1,2-diyl]bis(tricarbonylcobalt)(Co—Co) and [μ-1-nitroethyne-1,2-diyl]bis(tricarbonylcobalt)(Co—Co). The chemistry of these compounds reveals their potential as reaction partners in [2+2+2] cyclotrimerizations, furnishing nitroindane, nitrotetralin, and trinitrobenzene products. The X-ray crystal structure of 1,3,5-trinitro-2,4,6-tris(trimethylsilyl)benzene presents a distorted, yet planar, aromatic ring.

Reversible intercyclobutadiene haptotropism in cyclopentadienylcobalt linear [4]phenylene

Co-reporter:Thomas A. Albright, Sander Oldenhof, Oluwakemi A. Oloba, Robin Padilla and K. Peter C. Vollhardt

Chemical Communications 2011 vol. 47(Issue 32) pp:9039-9041

Publication Date(Web):18 Jul 2011

DOI:10.1039/C1CC13405A

Cyclopentadienylcobalt complexes of linear [4]phenylene undergo thermally reversible photoinduced metallahaptotropism between the inner and outer cyclobutadiene ring.

Radial (tetracyclopentadienyl)cyclobutadiene pentametals

Co-reporter:Michael J. Eichberg, Bernd Kayser, Philip W. Leonard, Ognjen Š. Miljanić, Tatiana V. Timofeeva, K. Peter C. Vollhardt, Glenn D. Whitener, Andrey Yakovenko, Yong Yu

Inorganica Chimica Acta 2011 Volume 369(Issue 1) pp:32-39

Publication Date(Web):15 April 2011

DOI:10.1016/j.ica.2010.10.004

Radial (tetracyclopentadienyl)cyclobutadiene pentametals have been synthesized by the Pd-catalyzed coupling of cyclopentadienyltin or of (CpM)zinc reagents with (tetraiodocyclobutadiene)iron(tricabonyl). X-ray structural and NMR data reveal that, while these arrays are crowded, the substituents enjoy considerable rotational freedom.The method constitutes a significant complement to currently existing strategies for the construction of persubstituted cyclobutadiene complexes.Graphical abstractRadial (tetracyclopentadienyl)cyclobutadiene pentametals have been synthesized by the Pd-catalyzed coupling of cyclopentadienyltin or of (CpM)zinc reagents with (tetraiodocyclobutadiene)iron(tricabonyl). X-ray structural and NMR data reveal that, while these arrays are crowded, the substituents enjoy considerable rotational freedom.The method constitutes a significant complement to currently existing strategies for the construction of persubstituted cyclobutadiene complexes.Research highlights► Pd-catalyzes the four-fold coupling of cyclopentadienyl metals with (tetraiodocyclobutadiene)iron(tricabonyl). ► Radial tetracyclopentadienyl)cyclobutadiene pentametals represent crowded arrays. ► Despite steric crowding, the substituents in radial (tetracyclopentadienyl)cyclobutadiene pentametals enjoy considerable rotational freedom.

Activated Phenacenes from Phenylenes by Nickel-Catalyzed Alkyne Cycloadditions

Co-reporter:Dr. Zhenhua Gu;Gregory B. Boursalian;Dr. Vincent Gon;Dr. Robin Padilla;Dr. Hao Shen; Tatiana V. Timofeeva;Paul Tongwa;Dr. K. Peter C. Vollhardt;Andrey A. Yakovenko

Angewandte Chemie 2011 Volume 123( Issue 40) pp:9585-9589

Publication Date(Web):

DOI:10.1002/ange.201103428

Activated Phenacenes from Phenylenes by Nickel-Catalyzed Alkyne Cycloadditions

Co-reporter:Dr. Zhenhua Gu;Gregory B. Boursalian;Dr. Vincent Gon;Dr. Robin Padilla;Dr. Hao Shen; Tatiana V. Timofeeva;Paul Tongwa;Dr. K. Peter C. Vollhardt;Andrey A. Yakovenko

Angewandte Chemie International Edition 2011 Volume 50( Issue 40) pp:9413-9417

Publication Date(Web):

DOI:10.1002/anie.201103428

Photoinduced N2 loss as a route to long-lived organometallic alkane complexes: A time-resolved IR and NMR study

Co-reporter:James A. Calladine, Olga Torres, Mitch Anstey, Graham E. Ball, Robert G. Bergman, John Curley, Simon B. Duckett, Michael W. George, Amy I. Gilson, Douglas J. Lawes, Robin N. Perutz, Xue-Zhong Sun and K. Peter C. Vollhardt

Chemical Science 2010 vol. 1(Issue 5) pp:622-630

Publication Date(Web):27 Aug 2010

DOI:10.1039/C0SC00311E

Photolysis of CpRe(CO)2(N2) in cyclopentane or 2,2-dimethylbutane with a UV lamp via a quartz fibre inserted into the NMR probe allows generation of CpRe(CO)2(cyclopentane) and CpRe(CO)2(2,2-dimethylbutane). The latter is observed in three isomeric forms according to the site of co-ordination to the rhenium. The major isomer, CpRe(CO)2(2,2-dimethylbutane-η2-C1,H1), exhibits a 1H NMR resonance for the co-ordinated hydrogen at δ = −2.19 with 1JC–H = 118 Hz. The photochemistry of Cp‡Re(CO)2(N2) (Cp‡ = η5-1,2-C5H3(tBu)2) in alkane solution is also reported. Two new organometallic alkane complexes, Cp‡Re(CO)2(alkane) (alkane = cyclopentane, n-heptane) have been characterized by IR spectroscopy following irradiation of Cp‡Re(CO)2(N2) and their rate constants for reaction with CO have been determined. The reaction with cyclopentane has also been studied by NMR spectroscopy at 190 K with in situ laser irradiation at 355 nm. Cp‡Re(CO)2(c-C5H10) is shown to exhibit the characteristic features of an alkane complex in the NMR spectrum, viz. a large isotopic shift of the 1H resonance at δ = −2.44 upon partial deuteration of the alkane (Δδ = 1.77 ppm), a large 1JC–H (114 Hz) and a large negative 13C chemical shift (δ = −33.8). We find no evidence for CO loss or agostic interactions of the t-butyl groups under these conditions. Cp‡Re(CO)2(alkane) has a slightly shorter lifetime (ca. 5x) than CpRe(CO)2(alkane) for a given alkane. Photolysis of CpRe(CO)2(N2) to form the organometallic alkane complex occurs with a much higher yield than for CpRe(CO)3. Efficient photo-ejection of N2 from Cp‡Re(CO)2(N2) is observed upon either 266 or 355 nm laser irradiation. A dinitrogen precursor allows for the use of longer wavelength irradiation and the generation of a higher concentration of the alkane complex following each laser pulse.

Mechanism of Thermal Reversal of the (Fulvalene)tetracarbonyldiruthenium Photoisomerization: Toward Molecular SolarThermal Energy Storage

Co-reporter:Dr. Yosuke Kanai;Dr. Varadharajan Srinivasan;Dr. Steven K. Meier;Dr. K. Peter C. Vollhardt; Jeffrey C. Grossman

Angewandte Chemie International Edition 2010 Volume 49( Issue 47) pp:8926-8929

Publication Date(Web):

DOI:10.1002/anie.201002994

Flash-vacuum-pyrolytic reorganization of angular [4]phenylene

Co-reporter:Peter I. Dosa, Zhenhua Gu, Dominik Hager, William L. Karney and K. Peter C. Vollhardt

Chemical Communications 2009 (Issue 15) pp:1967-1969

Publication Date(Web):10 Mar 2009

DOI:10.1039/B902648G

Flash vacuum pyrolysis of angular [4]phenylene furnishes “biphenylene dimer” on route to coronene.

PhotoThermal Haptotropism in Cyclopentadienylcobalt Complexes of Linear Phenylenes: Intercyclobutadiene Metal Migration

Co-reporter:ThomasA. Albright ;PeterI. Dosa Dr.;TomN. Grossmann Dr.;VictorN. Khrustalev Dr.;OluwakemiA. Oloba Dr.;Robin Padilla;Renaud Paubelle Dr.;Amnon Stanger ;TatianaV. Timofeeva ;K.PeterC. Vollhardt Dr.

Angewandte Chemie International Edition 2009 Volume 48( Issue 52) pp:9853-9857

Publication Date(Web):

DOI:10.1002/anie.200905088

PhotoThermal Haptotropism in Cyclopentadienylcobalt Complexes of Linear Phenylenes: Intercyclobutadiene Metal Migration

Angewandte Chemie 2009 Volume 121( Issue 52) pp:10037-10041

Publication Date(Web):

DOI:10.1002/ange.200905088

Cobalt-mediated regio- and stereoselective assembly of dienamides by hydroaminative alkyne coupling of α,ω-diynes

Co-reporter:Vincent Gandon, Corinne Aubert, Max Malacria and K. Peter C. Vollhardt

Chemical Communications 2008 (Issue 13) pp:1599-1601

Publication Date(Web):27 Feb 2008

DOI:10.1039/B716841A

In the presence of CpCo(C2H4)2, α,ω-diynes undergo hydroaminative coupling with amides to furnish new dienamides with control of regio- and stereochemistry.

The Thermal Retro[2+2+2]cycloaddition of Cyclohexane Activated by Triscyclobutenannelation: Concerted All-Disrotatory versus Stepwise Conrotatory Pathways to Fused [12]Annulenes

Co-reporter:Michael J. Eichberg Dr.;K. N. Houk Dr.;Jürg Lehmann Dr.;Philip W. Leonard Dr.;Anne Märker;Joseph E. Norton Dr.;Dorota Sawicka Dr.;K. Peter C. Vollhardt Dr.;Glenn D. Whitener Dr.;Stefan Wolff Dr.

Angewandte Chemie International Edition 2007 Volume 46(Issue 36) pp:

Publication Date(Web):7 AUG 2007

DOI:10.1002/anie.200702474

All dis or all con? While benzo analogues 2–4 undergo cycloreversion of the central cyclohexane ring by all-disrotatory opening, the triscyclobutenocyclohexane 1 does so by stepwise conrotatory cyclobutane rupture. This remarkable conclusion is based on DFT calculations carried out in conjunction with experiments.

The Thermal Retro[2+2+2]cycloaddition of Cyclohexane Activated by Triscyclobutenannelation: Concerted All-Disrotatory versus Stepwise Conrotatory Pathways to Fused [12]Annulenes

Angewandte Chemie 2007 Volume 119(Issue 36) pp:

Publication Date(Web):7 AUG 2007

DOI:10.1002/ange.200702474

Alles dis- oder alles kon-? In den Benzoderivaten 2–4 verläuft die Cycloreversion des mittleren Cyclohexanrings über eine all-disrotatorische Ringöffnung, während beim Triscyclobutenocyclohexan 1 eine stufenweise konrotatorische Spaltung der Cyclobutanringe stattfindet. Diese bemerkenswerte Schlussfolgerung beruht auf DFT-Rechnungen und experimentellen Befunden.

Cobalt-Mediated [2+2+2] Cycloaddition versus CH and NH Activation of Pyridones and Pyrazinones with Alkynes: An Experimental Study

Co-reporter:Corinne Aubert Dr.;Patrick Betschmann Dr.;Michael J. Eichberg Dr.;Vincent Gon Dr.;Thilo J. Heckrodt Dr.;Jürg Lehmann Dr.;Max Malacria Dr.;Birgit Masjost Dr.;Elisa Paredes Dr.;K. Peter C. Vollhardt Dr.;Glenn D. Whitener Dr.

Chemistry - A European Journal 2007 Volume 13(Issue 26) pp:

Publication Date(Web):20 JUN 2007

DOI:10.1002/chem.200601823

The reactivity of a range of pyridone and pyrazinone derivatives towards alkynes in the presence of cyclopentadienylcobaltbis(ethene) has been investigated. Depending on the nature of the substrates, [2+2+2]- or [2+2] cycloaddition, CH, or NH activation may occur. In the case of pyridones, the first three predominated with N-protected derivatives, whereas substrates containing NH bonds followed an NH activation pathway. The [2+2+2] cycloaddition of an N-butynylisoquinolone was applied successfully to the total synthesis of anhydrolycorinone. Pyrazinone substrates showed similar patterns of reactivity.

Eine Reihe von Pyridon- und Pyrazinonderivaten wurde auf ihre Reaktivität gegenüber Alkinen in der Gegenwart von Cyclopentadienylcobaltbis(ethen) untersucht. In Abhängigkeit vom Substrat traten zum einen [2+2+2] oder [2+2] Cycloadditionen auf, zum anderen auch CH oder NH Aktivierungsreaktionen. Die ersten drei Fälle dominierten wenn N-geschützte Pyridone verwendet wurden, wohingegen Substrate mit NH Bindungen eine NH Aktivierung unterliefen. Die [2+2+2] Cycloaddition eines N-Butinylisochinolons wurde erfolgreich in der Totalsynthese von Anhydrolycorinon eingesetzt. Pyrazinone zeigten ein ähnliches Reaktionsverhalten.

Cobalt-Mediated [2+2+2] Cycloaddition versus CH and NH Activation of 2-Pyridones and Pyrazinones with Alkynes: A Theoretical Study

Co-reporter:Corinne Aubert Dr.;Vincent Gon Dr.;Anaïs Geny Dr.;Thilo J. Heckrodt Dr.;Max Malacria Dr.;Elisa Paredes Dr.;K. Peter C. Vollhardt Dr.

Chemistry - A European Journal 2007 Volume 13(Issue 26) pp:

Publication Date(Web):20 JUN 2007

DOI:10.1002/chem.200601822

DFT computations have been executed aimed at illuminating the variety of pathways by which pyridones react with alkynes in the presence of [CpCoL₂]: NH-2-pyridones furnish N-dienylated ligands (NH activation pathway), N-methyl-2-pyridones are converted into ligated cyclohexadienes ([2+2+2] cocycloaddition pathway), and N-alkynyl-2-pyridones may undergo either [2+2+2] cocycloaddition or C-dienylation (CH activation), depending on the length of the tether. The calculations predict the formation of the experimentally observed products, including their regio- and stereochemical make up. In addition, the unusual regiochemical outcome of the all-intramolecular [2+2+2] cycloaddition of N,N′-dipentynylpyrazinedione was rationalized by computation, which led to the discovery of a new mechanism.

Es wurden DFT Berechnungen angestellt, um Licht in die vielfältigen Reaktionswege zu bringen, durch die Pyridone mit Alkinen in Gegenwart von [CpCoL₂] reagieren: NH-2-Pyridone ergeben N-Dienliganden (NH Aktivierung), N-Methyl-2-pyridone geben komplexierte Cyclohexadiene ([2+2+2] Cocycloaddition), und N-Alkinyl-2-pyridone unterlaufen in Abhängigkeit von der Kettenlänge entweder eine [2+2+2] Cocycloaddition oder C-Dienylierung (CH Aktivierung). Die Berechnungen sagen die experimentell beobachteten Produkte voraus, inklusive deren regio- und stereochemischem Aufbaus. Darüberhinaus konnte durch Berechnungen der ungewöhnliche regiochemische Verlauf der komplett intramolekularen [2+2+2] Cycloaddition von N,N-Dipentinylpyrazindion erklärt werden, was zur Entdeckung eines neuen Mechanismus führte.

Hexaferrocenylbenzene

Co-reporter:Yong Yu, Andrew D. Bond, Philip W. Leonard, Ulrich J. Lorenz, Tatiana V. Timofeeva, K. Peter C. Vollhardt, Glenn D. Whitener and Andrey A. Yakovenko

Chemical Communications 2006 (Issue 24) pp:2572-2574

Publication Date(Web):23 May 2006

DOI:10.1039/B604844G

Hexaferrocenylbenzene has been synthesized by six-fold Negishi type ferrocenylation of hexabromo- or hexaiodobenzene.

Syntheses, Structures, and Reactivity of Radial Oligocyclopentadienyl Metal Complexes: Penta

Co-reporter:Yong Yu, Andrew D. Bond, Philip W. Leonard, K. Peter C. Vollhardt,Glenn D. Whitener

Angewandte Chemie International Edition 2006 45(11) pp:1794-1799

Publication Date(Web):

DOI:10.1002/anie.200504047

Cover Picture: Syntheses, Structures, and Reactivity of Radial Oligocyclopentadienyl Metal Complexes: Penta

Co-reporter:Yong Yu, Andrew D. Bond, Philip W. Leonard, K. Peter C. Vollhardt,Glenn D. Whitener

Angewandte Chemie International Edition 2006 45(11) pp:1661

Publication Date(Web):

DOI:10.1002/anie.200690036

Titelbild: Syntheses, Structures, and Reactivity of Radial Oligocyclopentadienyl Metal Complexes: Penta(ferrocenyl)cyclopentadienyl and Congeners (Angew. Chem. 11/2006)

Co-reporter:Yong Yu Dr.;Andrew D. Bond Dr.;Philip W. Leonard ;Glenn D. Whitener Dr.

Angewandte Chemie 2006 Volume 118(Issue 11) pp:

Publication Date(Web):1 MAR 2006

DOI:10.1002/ange.200690036

Syntheses, Structures, and Reactivity of Radial Oligocyclopentadienyl Metal Complexes: Penta(ferrocenyl)cyclopentadienyl and Congeners

Co-reporter:Yong Yu Dr.;Andrew D. Bond Dr.;Philip W. Leonard ;Glenn D. Whitener Dr.

Angewandte Chemie 2006 Volume 118(Issue 11) pp:

Publication Date(Web):10 FEB 2006

DOI:10.1002/ange.200504047

„Super“-Cp: Die fünffache Negishi-Kupplung von Pentaiodcymantren lieferte radiale Oligocyclopentadienylmetallkomplexe (siehe Schema). Diese Komplexe weisen ein faszinierendes Konformations- und Reaktionsverhalten auf, das sich z. B. in der Bildung von M-M- und Cp-Cp-Bindungen sowie der Freisetzung des neuartigen Überliganden Penta(ferrocenyl)cyclopentadien äußert.

Hindered rotation in an “exploded” biphenyl

Co-reporter:Ognjen Š. Miljanić, Sangdon Han, Daniel Holmes, Gaston R. Schaller and K. Peter C. Vollhardt

Chemical Communications 2005 (Issue 20) pp:2606-2608

Publication Date(Web):06 Apr 2005

DOI:10.1039/B503173G

The first cases of hindered rotation around the triple bond in simple diphenylacetylenes were observed, including that in chiral 2,2′-bis(trimethylsilyl)-6,6′-bis(dimethylthexylsilyl)diphenylacetylene.

Anatomy of a Cyclohexatriene: Chemical Dissection of the π and σ Frame of Angular [3]Phenylene

Co-reporter:Sriram Kumaraswamy Dr.;Satish S. Jalisatgi Dr.;Adam J. Matzger Dr.;Ognjen Š. Miljanić

Angewandte Chemie 2004 Volume 116(Issue 28) pp:

Publication Date(Web):7 JUL 2004

DOI:10.1002/ange.200454126

Eine gespannte Feder: Das partielle Aufbrechen des zentralen Cyclohexatrienkerns von angularem [3]Phenylen liefert einen neuartigen vierkernigen Cluster als Folge einer doppelten regio- und stereospezifischen C-C-Aktivierung durch Cyclopentadienylcobalt [Reaktion (a)]. Das vollständige Aufbrechen beim Behandeln mit Dimethylbutindioat [Reaktion (b)] führt zu einem hochgespannten voll ungesättigten [6]Paracyclophan.

Anatomy of a Cyclohexatriene: Chemical Dissection of the π and σ Frame of Angular [3]Phenylene

Co-reporter:Sriram Kumaraswamy Dr.;Satish S. Jalisatgi Dr.;Adam J. Matzger Dr.;Ognjen Š. Miljanić

Angewandte Chemie International Edition 2004 Volume 43(Issue 28) pp:

Publication Date(Web):7 JUL 2004

DOI:10.1002/anie.200454126

A loaded spring: Partial rupture of the central cyclohexatriene nucleus of angular [3]phenylene yields a novel tetranuclear cluster through regio- and stereospecific double CC bond activation by cyclopentadienylcobalt (see scheme, a)). Complete rupture upon treatment with dimethyl butynedioate in b) leads to a highly strained and completely unsaturated [6]paracyclophane.

Cobalt-mediated regio- and stereoselective assembly of dienamides by hydroaminative alkyne coupling of α,ω-diynes

Co-reporter:Vincent Gandon, Corinne Aubert, Max Malacria and K. Peter C. Vollhardt

Chemical Communications 2008(Issue 13) pp:

Publication Date(Web):

DOI:10.1039/B716841A

Photoinduced N2 loss as a route to long-lived organometallic alkane complexes: A time-resolved IR and NMR study

Chemical Science (2010-Present) 2010 - vol. 1(Issue 5) pp:NaN630-630

Publication Date(Web):2010/08/27

DOI:10.1039/C0SC00311E

Switching from Ru to Fe: picosecond IR spectroscopic investigation of the potential of the (fulvalene)tetracarbonyldiiron frame for molecular solar-thermal storage

Co-reporter:Zongrui Hou, Son C. Nguyen, Justin P. Lomont, Charles B. Harris, Nikolai Vinokurov and K. Peter C. Vollhardt

Physical Chemistry Chemical Physics 2013 - vol. 15(Issue 20) pp:NaN7469-7469

Publication Date(Web):2013/04/02

DOI:10.1039/C3CP51292D

Flash-vacuum-pyrolytic reorganization of angular [4]phenylene

Co-reporter:Peter I. Dosa, Zhenhua Gu, Dominik Hager, William L. Karney and K. Peter C. Vollhardt

Chemical Communications 2009(Issue 15) pp:NaN1969-1969

Publication Date(Web):2009/03/10

DOI:10.1039/B902648G

Flash vacuum pyrolysis of angular [4]phenylene furnishes “biphenylene dimer” on route to coronene.

Reversible intercyclobutadiene haptotropism in cyclopentadienylcobalt linear [4]phenylene

Co-reporter:Thomas A. Albright, Sander Oldenhof, Oluwakemi A. Oloba, Robin Padilla and K. Peter C. Vollhardt

Chemical Communications 2011 - vol. 47(Issue 32) pp:NaN9041-9041

Publication Date(Web):2011/07/18

DOI:10.1039/C1CC13405A

Cyclopentadienylcobalt complexes of linear [4]phenylene undergo thermally reversible photoinduced metallahaptotropism between the inner and outer cyclobutadiene ring.