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Heterogeneous Catalyst Paper Published

11/20/2020

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A collaborative paper between the Shaughnessy, Martin Bakker, and Yuping Bao groups at UA has been published in the Journal of Sol-Gel Science and Technology.  The paper describes the one-pot synthesis of heirarchically porous carbon containing nickel nanoparticles by incorporation of nickel-salen complexes in the carbon sol-gel synthesis.  The resulting nickel-containing materials were effective catalysts for the reduction of 4-nitrophenol. 
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Arylpalladium precatalyst paper published

10/9/2020

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 A paper by Ethan Hu, Corrie Burlas, Sabrina Curley, Tomasz Gruchala and Fengrui Qu entitled, "Effect of Aryl Ligand Identity on Catalytic Performance of Trineopentylphosphine Arylpalladium Complexes in N-Arylation Reactions," has been published in Organometallics.  The paper describes the role of steric effects of aryl ligands on the performance of palladium catalysts in C-N cross-coupling reactions.
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Inorganic Chemistry Paper Published

4/9/2020

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The last paper from Dr. Kerry Barnett's dissertation has been published in Inorganic Chemistry in collaboration with the Dixon Group.  This paper provides a detailed structural analysis of the palladium complexes of trineopentylphosphine ligands using computational and experimental data.  The highly flexible trineopentylphosphine ligand adopts a very sterically demanding conformation when coordinated to 1- or 2-coordinate palladium centers.  Unusually, this very sterically demanding ligand is highly pyramidalized due to the low back-side strain of the neopentyl groups.  When coordinated to a 3- or 4-coordinate palladium center, trineopentylphoshine adopts a less sterically demanding conformation.
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ACS Catalysis paper published

3/6/2020

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A paper authored by Huaiyuan "Ethan" Hu, Ashley Gilliam, and Fengrui Qu entitled, "Enolizable Ketones as Activators of Palladium(II) Precatalysts in Amine Arylation Reactions," has been published in ACS Catalysis.​  The paper describes a novel reduction of palladium(II) precatalysts using enolizable ketones.
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Trialkylphosphine review published in Current Organic Chemistry

2/27/2020

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A review authored by Kevin Shaughnessy has been published in Current Organic Chemistry.  The review is entitled, "Monodentate Trialkylphosphines as Privileged Ligands in Metal-Catalyzed Cross-Coupling Reactions."
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Hu paper on structural characterization of trineopentylphosphine complexes published.

9/25/2019

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A paper by Dr. Ethan Hu entitled, "Synthesis, Structural Characterization, and Coordination Chemistry of (Trineopentylphosphine)palladium(aryl)bromide Dimer Complexes ([(Np3P)Pd(Ar)Br]2)," was published in Inorganic Chemistry.  Co-authors on the paper are, Monica Vasiliu, Deidra Gerlach, Fengrui Qu, Trent Stein, Dr. David Dixon, and Kevin Shaughnessy.  The paper describes the structure of the trineopentylphosphine ligand in [(Np3P)Pd(Ar)Br]2 complexes as a function of the steric demand of the aryl group.  The trineopentylphosphine is highly flexible allowing it to accommodate other sterically demanding ligands.
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Review published in Israel Journal of Chemistry

9/5/2019

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A review entitled, "Development of Palladium Precatalysts that Efficiently Generate LPd(0) Active Species," has been published in the Israel Journal of Chemistry.  This article was an invited contribution for a special issue honoring John Hartwig and Stephen Buchwald on receiving the Wolf Prize in Chemistry.

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Precatalyst activation paper published in Organometallics

4/16/2018

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A paper authored by Kerry Barnett, James Howard, Renee Stullich, Adam Shipley, and Colin Treager entitled, "Air-Stable [(R3P)PdCl2]2 Complexes of Neopentylphosphines as Cross- Coupling Precatalysts: Catalytic Application and Mechanism of Catalyst Activation and Deactivation," was published in Organometallics.  This paper describes the use of [(R3P)PdCl2]2 complexes as catalysts in the Suzuki coupling.  A study of the mechanism of conversion of the Pd(II) precatalyst to the Pd(0) active species showed that palladacycle formation was a competitive pathway in acetonitrile.  Switching the solvent to toluene eliminated formation of the palladacycle byproduct.  This solvent switch allowed a 50-fold decrease in catalyst loading.

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Carbon-supported metal paper published

10/3/2017

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A collaborative paper involving the Shaughnessy and Martin Bakker groups in Chemistry and the John van Zee group in Chemical & Biological Engineering was published in the Journal of Sol-Gel Science and Technology.  The paper entitled, "Copolymerization of Transition Metal Salen Complexes and Conversion into Metal Nanoparticles Supported on Hierarchically Porous Carbon Monoliths: A One Pot Synthesis," describes the incorporation of metal salen complexes in a carbon sol-gel.  Pyrolysis provides a carbon material with metal nanoparticles.
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ACS Catalysis Paper Published

2/23/2017

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A paper authored by Ethan Hu entitled, "Mechanistic Study of the Role of Substrate Steric Effects and Aniline Inhibition on the Bis(trineopentylphosphine)palladium(0)-Catalyzed Arylation of Aniline Derivatives," has been published in ACS Catalysis.
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