Category: Publications

Chemical Record account published

9/14/2022

An personal account entitled, "Covalent Modification of Nucleobases using Water-Soluble Palladium Catalysts," written by Kevin Shaughnessy has been published in The Chemical Record. This review was invited as part of a special issue on Nucleoside, Nucleotide, and Oligonucleotide modification edited by Anant Kapdi and Mahesh Lakshman.

Collaborative Boron Cluster Paper Published

7/9/2021

A collaborative paper involving the Piotr Kaszyński group at the Center for Marcomolecular and Molecular Chemistry, Łódź, Poland, Prof. Michael Sponssler at Syracuse, and the Shaughnessy group was recently published in Organometallics. The paper is entitled, "Decaborate [closo-B10H10]2– as an efficient conduit of electronic effects: Comparative studies of Fe…Fe communication in [{(η5-Cp)(dppe)Fe}2{μ2-(NC-X-CN)}]n+ (n =0,2)." A portion of the experimental work on this project was completed during Kevin Shaughnessy's Fulbright stay in Łódź in spring 2020.

Heterogeneous Catalyst Paper Published

11/20/2020

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.

Arylpalladium precatalyst paper published

10/9/2020

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.

Inorganic Chemistry Paper Published

4/9/2020

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.

ACS Catalysis paper published

3/6/2020

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.

Trialkylphosphine review published in Current Organic Chemistry

2/27/2020

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."

Hu paper on structural characterization of trineopentylphosphine complexes published.

9/25/2019

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.

Review published in Israel Journal of Chemistry

9/5/2019

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.

Precatalyst activation paper published in Organometallics

4/16/2018

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.