Search results for: Jeffrey L. Petersen

Items from 1 to 20 out of 110 results

article

Effects of 2,6‐Dichlorophenyl Substituents on the Coordination Chemistry of Pyridine Dipyrrolide Iron Complexes

Brett M. Hakey, Dylan C. Leary, Jose G. Rodriguez, Jordan C. Martinez, more

Zeitschrift für anorganische und allgemeine Chemie > 647 > 14 > 1503 - 1517

A series of iron complexes featuring the pyridine dipyrrolide (PDP) pincer ligand [^Cl2PhPDP^Ph]²⁻, obtained via deprotonation of 2,6‐bis(5‐(2,6‐dichlorophenyl)‐3‐phenyl‐1H‐pyrrol‐2‐yl)pyridine, H₂^Cl2PhPDP^Ph, is reported and structurally and spectroscopically characterized. While the bis‐pyridine adduct (^Cl2PhPDP^Ph)Fe(py)₂ exhibits nearly identical features as previously reported (^MesPDP^Ph)Fe(py)₂ (H...

article

Photoluminescence of Seven‐Coordinate Zirconium and Hafnium Complexes with 2,2′‐Pyridylpyrrolide Ligands

Yu Zhang, Novruz G. Akhmedov, Jeffrey L. Petersen, Carsten Milsmann

Chemistry – A European Journal > 25 > 12 > 3042 - 3052

Luminescent seven‐coordinated zirconium and hafnium complexes bearing three mono‐anionic 2,2′‐pyridylpyrrolide ligands and one chloride were synthesized. Solid‐state structures and the dynamic behaviors in solution were probed by X‐ray crystallography and variable temperature ¹H NMR experiments, respectively. Absorption spectroscopy and time‐dependent density functional theory (TD‐DFT) calculations...

article

Synthesis of Cycloparaphenylenes Bearing Furan‐2,5‐diyl or 2,2’‐Bifuran‐5,5’‐diyl Units in the Macrocyclic Structures

Behzad Farajidizaji, Haresh Thakellapalli, Shuangjiang Li, Changfeng Huang, more

Chemistry – A European Journal > 22 > 46 > 16420 - 16424

Synthetic pathways to furan‐containing cycloparaphenylenes (CPPs) as molecular nanohoops bearing 10, 12, and 15 aromatic units including furan‐2,5‐diyl or 2,2’‐bifuran‐5,5’‐diyl units have been developed. The X‐ray structures of a partially hydrogenated bifuran‐containing CPP precursor and the corresponding fully aromatized bifuran‐containing CPP were obtained to allow the determination of their conformational...

article

Ligand‐Assisted Gold‐Catalyzed Cross‐Coupling with Aryldiazonium Salts: Redox Gold Catalysis without an External Oxidant

Rong Cai, Mei Lu, Ellen Y. Aguilera, Yumeng Xi, more

Angewandte Chemie > 127 > 30 > 8896 - 8900

Gold‐catalyzed C(sp)–C(sp²) and C(sp²)–C(sp²) cross‐coupling reactions are accomplished with aryldiazonium salts as the coupling partner. With the assistance of bpy ligand, gold(I) species were oxidized to gold(III) by diazonium without any external oxidants. Monitoring the reaction with NMR and ESI‐MS provided strong evidence for the nitrogen extrusion followed by Au^III reductive elimination as the...

article

Ligand‐Assisted Gold‐Catalyzed Cross‐Coupling with Aryldiazonium Salts: Redox Gold Catalysis without an External Oxidant

Rong Cai, Mei Lu, Ellen Y. Aguilera, Yumeng Xi, more

Angewandte Chemie International Edition > 54 > 30 > 8772 - 8776

article

Iron(III) catalyzed halo-functionalization of alkynes

Bryant Catano, John Lee, Claudia Kim, David Farrell, more

Tetrahedron Letters > 2015 > 56 > 27 > 4124-4127

Aromatic and aliphatic alkynes can be halo-functionalized to α,α-dihalodimethyl ketals catalyzed by FeCl₃ in excellent yields. MeOH is used as a nucleophilic solvent and N-halosuccinimide as the halogen source for this efficient transformation. The resulting α,α-dibromodimethyl ketals can be converted to the corresponding α,α-dibromoketones by treatment with 8% FeCl₃ in silica gel.

article

Scorpionato Halide Complexes [(Tp^Ph,Me)Ni–X] [X = Cl, Br, I; Tp^Ph,Me = Hydrotris(3‐phenyl‐5‐methyl‐1‐pyrazolyl)borate]: Structures, Spectroscopy, and Pyrazole Adducts

Tapash Deb, Caitlin M. Anderson, Huaibo Ma, Jeffrey L. Petersen, more

European Journal of Inorganic Chemistry > 2015 > 3 > 458 - 467

Pseudotetrahedral scorpionato halide complexes [(Tp^Ph,Me)Ni–X] [Tp^Ph,Me = hydrotris(3‐phenyl‐5‐methyl‐1‐pyrazolyl)borate] were synthesized by metathesis of Tl(Tp^Ph,Me) and NiX₂ (X = Cl, Br, I). Pyrazole adducts [(Tp^Ph,Me)Ni(Hpz^Ph,Me)(X)] (X = Cl, I) were also obtained. [(Tp^Ph,Me)Ni–X] (X = Br, I) are isomorphous with previously reported [(Tp^Ph,Me)Ni–Cl], and a new solvated pseudo‐polymorph [(Tp^Ph,Me...

article

Synthesis and characterization of fluorescent-active triazole-gold complexes

Boliang Dong, Yijin Su, Xiaohan Ye, Jeffrey L. Petersen, more

Science China Chemistry > 2015 > 58 > 7 > 1235-1238

Fluorescence active fused-triazole was developed as a ligand in gold(I) cation coordination. The coordination ability was evaluated using NMR and fluorescence emission. Our previously reported N-2-aryl-triazoles, though gave good emission, could not form stable complexes with gold cations. A new N-fused-triazole (NFT) derivative was prepared and the ligand indicated good fluorescence emission, and...

article

Synthesis of Cyclic Amine Boranes through Triazole‐Gold(I)‐Catalyzed Alkyne Hydroboration

Qiaoyi Wang, Stephen E. Motika, Novruz G. Akhmedov, Jeffrey L. Petersen, more

Angewandte Chemie > 126 > 21 > 5522 - 5526

The first catalytic alkyne hydroboration of propargyl amine boranecarbonitriles is accomplished with triazole‐Au^I complexes. While the typical [L‐Au]⁺ species decomposes within minutes upon addition of amine boranecarbonitriles, the triazole‐modified gold catalysts (TA‐Au) remained active, and allowed the synthesis of 1,2‐BN‐cyclopentenes in one step with good to excellent yields. With good substrate...

article

Synthesis of Cyclic Amine Boranes through Triazole‐Gold(I)‐Catalyzed Alkyne Hydroboration

Qiaoyi Wang, Stephen E. Motika, Novruz G. Akhmedov, Jeffrey L. Petersen, more

Angewandte Chemie International Edition > 53 > 21 > 5418 - 5422

article

Gold‐Catalyzed Intermolecular CS Bond Formation: Efficient Synthesis of α‐Substituted Vinyl Sulfones

Yumeng Xi, Boliang Dong, Edward J. McClain, Qiaoyi Wang, more

Angewandte Chemie > 126 > 18 > 4745 - 4749

A general method for the synthesis of α‐substituted vinyl sulfones makes use of a combination of a triazole gold complex and gallium triflate. This efficient CS bond formation between simple terminal alkynes and sulfinic acids provides access to various α‐substituted vinyl sulfones.

article

Gold‐Catalyzed Intermolecular CS Bond Formation: Efficient Synthesis of α‐Substituted Vinyl Sulfones

Yumeng Xi, Boliang Dong, Edward J. McClain, Qiaoyi Wang, more

Angewandte Chemie International Edition > 53 > 18 > 4657 - 4661

article

Reaction of Unsaturated Vicinal Phosphane/Borane Frustrated Lewis Pairs with Benzaldehyde

Olga Ekkert, Gerald Kehr, Constantin G. Daniliuc, Roland Fröhlich, more

Zeitschrift für anorganische und allgemeine Chemie > 639 > 14 > 2455 - 2462

Diarylphosphino‐substituted alkynes undergo a 1, 1‐carboboration reaction with tris(pentafluorophenyl)borane to yield 2‐diarylphosphino‐substituted alkenylboranes. These unsaturated systems show a P/B interaction. Nevertheless, they feature a limited frustrated Lewis pair (FLP) reactivity. Four such unsaturated vicinal FLPs were shown to react with benzaldehyde to give the respective six‐membered...

article

Dibenzopentalenes from B(C₆F₅)₃‐Induced Cyclization Reactions of 1,2‐Bis(phenylethynyl)benzenes

Chao Chen, Marcel Harhausen, René Liedtke, Kathrin Bussmann, more

Angewandte Chemie > 125 > 23 > 6108 - 6112

Bei Raumtemperatur wandelt die starke Lewis‐Säure B(C₆F₅)₃ Bis(arylethinyl)benzole über eine Abfolge von Lewis‐Säure‐induzierten Cyclisierungen in Dibenzopentalene um. Die Reaktion ist daher potenziell nützlich für die Synthese substituierter Dibenzopentalenderivate, die auf herkömmliche Weise schwer zu erhalten sind.

article

Dibenzopentalenes from B(C₆F₅)₃‐Induced Cyclization Reactions of 1,2‐Bis(phenylethynyl)benzenes

Chao Chen, Marcel Harhausen, René Liedtke, Kathrin Bussmann, more

Angewandte Chemie International Edition > 52 > 23 > 5992 - 5996

'Lene' and mean: The strong Lewis acid B(C₆F₅)₃ efficiently converts some bis(arylethynyl)benzenes into dibenzopentalenes through a series of Lewis acid induced cyclization reactions at room temperature. Thus the reaction has the potential to be useful in the synthesis of substituted dibenzopentalene derivatives which are difficult to make by conventional means.

article

Oxidative assembly of octahedral nickel(II)-tris(3,5-dimethylpyrazol-1-yl)methane (Tpm∗) complexes by reaction of Ni(COD)2 (COD=1,5-cyclooctadiene) with putative oxene and nitrene precursors

Shengwen Liang, Swarup Chattopadhyay, Jeffrey L. Petersen, Victor G. Young, more

Polyhedron > 2013 > 50 > 1 > 75-81

Reactions of [Ni ⁰ (COD) ₂ ] (COD=1,5-cyclooctadiene) with meta-chloroperoxybenzoic acid, phenyl-N-tosylimidoiodinane or 2-(tert-butylsulfonyl)iodosylbenzene were performed in THF solution in the presence of one equivalent of tris(3,5-dimethylpyrazol-1-yl)methane (Tpm ^∗ ), yielding the product complexes [Tpm ^∗ Ni ^II (OH ₂ )(3-ClC ₆ H ₄ ...

article

Carboboration Reactions of 1,2‐Bis[(diarylphosphino)ethynyl]benzenes with Tris(pentafluorophenyl)borane

René Liedtke, Gerald Kehr, Roland Fröhlich, Constantin G. Daniliuc, more

Helvetica Chimica Acta > 95 > 12 > 2515 - 2527

The 1,2‐bis[(diarylphosphino)ethynyl]benzene derivatives 1a (R=Ph) and 1b (R=o‐tolyl) undergo 1,1‐carboboration at one of their acetylene units upon treatment with (C₆F₅)₃B at elevated temperature to give the products 5a and 5b, respectively. At room temperature, we observed the formation of the corresponding phosphireniumborate zwitterions, 7a and 7b, respectively, which may be intermediates of the...

article

Hydrogen Activation by an Intramolecular Boron Lewis Acid/Zirconocene Pair

Santhosh Kumar Podiyanachari, Roland Fröhlich, Constantin G. Daniliuc, Jeffrey L. Petersen, more

Angewandte Chemie > 124 > 35 > 8960 - 8963

Wasserstoffspaltung: Die Reaktion des Zirconiumkomplexes A mit dem Piers‐Boran [HB(C₆F₅)₂] liefert den ungewöhnlichen Borylalkin‐Zirconocenkomplex B, der Diwasserstoff aktivieren kann und dabei den doppelt Hydrido‐verbrückten Alkinzirconiumkomplex C ergibt.

article

Hydrogen Activation by an Intramolecular Boron Lewis Acid/Zirconocene Pair

Santhosh Kumar Podiyanachari, Roland Fröhlich, Constantin G. Daniliuc, Jeffrey L. Petersen, more

Angewandte Chemie International Edition > 51 > 35 > 8830 - 8833

Let's split: Reaction of the zirconium complex A with Piers' borane [HB(C₆F₅)₂] yields the unusual borylalkyne zirconocene complex B which reacts with dihydrogen, activating it to give the doubly hydrido bridged alkyne zirconium complex C.

article

Comproportionation of Cationic and Anionic Tungsten Complexes Having an N -Heterocyclic Carbene Ligand To Give the Isolable 17-Electron Tungsten Radical CpW(CO) ₂ (IMes) ^•

John A. S. Roberts, James A. Franz, Edwin F. van der Eide, Eric D. Walter, more

Journal of the American Chemical Society > 2011 > 133 > 37 > 14593 - 14603

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INFONA - science communication portal

Search results for: Jeffrey L. Petersen

Effects of 2,6‐Dichlorophenyl Substituents on the Coordination Chemistry of Pyridine Dipyrrolide Iron Complexes

Photoluminescence of Seven‐Coordinate Zirconium and Hafnium Complexes with 2,2′‐Pyridylpyrrolide Ligands

Synthesis of Cycloparaphenylenes Bearing Furan‐2,5‐diyl or 2,2’‐Bifuran‐5,5’‐diyl Units in the Macrocyclic Structures

Ligand‐Assisted Gold‐Catalyzed Cross‐Coupling with Aryldiazonium Salts: Redox Gold Catalysis without an External Oxidant

Ligand‐Assisted Gold‐Catalyzed Cross‐Coupling with Aryldiazonium Salts: Redox Gold Catalysis without an External Oxidant

Iron(III) catalyzed halo-functionalization of alkynes

Scorpionato Halide Complexes [(Tp^Ph,Me)Ni–X] [X = Cl, Br, I; Tp^Ph,Me = Hydrotris(3‐phenyl‐5‐methyl‐1‐pyrazolyl)borate]: Structures, Spectroscopy, and Pyrazole Adducts

Synthesis and characterization of fluorescent-active triazole-gold complexes

Synthesis of Cyclic Amine Boranes through Triazole‐Gold(I)‐Catalyzed Alkyne Hydroboration

Synthesis of Cyclic Amine Boranes through Triazole‐Gold(I)‐Catalyzed Alkyne Hydroboration

Gold‐Catalyzed Intermolecular CS Bond Formation: Efficient Synthesis of α‐Substituted Vinyl Sulfones

Gold‐Catalyzed Intermolecular CS Bond Formation: Efficient Synthesis of α‐Substituted Vinyl Sulfones

Reaction of Unsaturated Vicinal Phosphane/Borane Frustrated Lewis Pairs with Benzaldehyde

Dibenzopentalenes from B(C₆F₅)₃‐Induced Cyclization Reactions of 1,2‐Bis(phenylethynyl)benzenes

Dibenzopentalenes from B(C₆F₅)₃‐Induced Cyclization Reactions of 1,2‐Bis(phenylethynyl)benzenes

Oxidative assembly of octahedral nickel(II)-tris(3,5-dimethylpyrazol-1-yl)methane (Tpm∗) complexes by reaction of Ni(COD)2 (COD=1,5-cyclooctadiene) with putative oxene and nitrene precursors

Carboboration Reactions of 1,2‐Bis[(diarylphosphino)ethynyl]benzenes with Tris(pentafluorophenyl)borane

Hydrogen Activation by an Intramolecular Boron Lewis Acid/Zirconocene Pair

Hydrogen Activation by an Intramolecular Boron Lewis Acid/Zirconocene Pair

Comproportionation of Cationic and Anionic Tungsten Complexes Having an N -Heterocyclic Carbene Ligand To Give the Isolable 17-Electron Tungsten Radical CpW(CO) ₂ (IMes) ^•

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