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.
The Shaughnessy group presented 5 papers at the ACS meeting in New Orleans.
Kevin Shaughnessy gave a talk in the Homogeneous Catalysis for Applied Organic Synthesis symposium entitled, "Alkylphosphine cyclometallation as a mode of catalyst deactivation and a source of active catalysts."
Ethan Hu gave a talk entitled, "Methods to reduce Pd(II) precatalysts to Pd(0) for cross-coupling reactions" in the Organic Division.
Benjamin Headford presented a poster entitled, "Synthesis and catalytic application of asymmetrically substituted 1,3-diphosphines," in the Organic Division.
James Howard presented a talk entitled, "Synthesis and catalytic application of asymmetrically substituted 1,3-diphosphines," in the Division of Chemical Education.
Connar Franklin gave a poster in the Division of Chemical Education entitled, "Phosphine-free palladium catalysts for the direct arylation of heterocyclic aromatic compounds."
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