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Dive into the research topics where Damian P. Hruszkewycz is active.

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Featured researches published by Damian P. Hruszkewycz.


Journal of the American Chemical Society | 2011

Palladium(I)-bridging allyl dimers for the catalytic functionalization of CO2.

Damian P. Hruszkewycz; Jianguo Wu; Nilay Hazari; Christopher D. Incarvito

In general, the chemistry of both η(1)-allyl and η(3)-allyl Pd complexes is extremely well understood; η(1)-allyls are nucleophilic and react with electrophiles, whereas η(3)-allyls are electrophilic and react with nucleophiles. In contrast, relatively little is known about the chemistry of metal complexes with bridging allyl ligands. In this work, we describe a more efficient synthetic methodology for the preparation of Pd(I)-bridging allyl dimers and report the first studies of their stoichiometric reactivity. Furthermore, we show that these compounds can activate CO(2) and that an N-heterocyclic carbene-supported dimer is one of the most active and stable catalysts reported to date for the carboxylation of allylstannanes and allylboranes with CO(2).


Journal of the American Chemical Society | 2014

Insight into the efficiency of cinnamyl-supported precatalysts for the Suzuki-Miyaura reaction: observation of Pd(I) dimers with bridging allyl ligands during catalysis.

Damian P. Hruszkewycz; David Balcells; Louise M. Guard; Nilay Hazari; Mats Tilset

Despite widespread use of complexes of the type Pd(L)(η(3)-allyl)Cl as precatalysts for cross-coupling, the chemistry of related Pd(I) dimers of the form (μ-allyl)(μ-Cl)Pd2(L)2 has been underexplored. Here, the relationship between the monomeric and the dimeric compounds is investigated using both experiment and theory. We report an efficient synthesis of the Pd(I) dimers (μ-allyl)(μ-Cl)Pd2(IPr)2 (allyl = allyl, crotyl, cinnamyl; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) through activation of Pd(IPr)(η(3)-allyl)Cl type monomers under mildly basic reaction conditions. The catalytic performance of the Pd(II) monomers and their Pd(I) μ-allyl dimer congeners for the Suzuki-Miyaura reaction is compared. We propose that the (μ-allyl)(μ-Cl)Pd2(IPr)2-type dimers are activated for catalysis through disproportionation to Pd(IPr)(η(3)-allyl)Cl and monoligated IPr-Pd(0). The microscopic reverse comproportionation reaction of monomers of the type Pd(IPr)(η(3)-allyl)Cl with IPr-Pd(0) to form Pd(I) dimers is also studied. It is demonstrated that this is a facile process, and Pd(I) dimers are directly observed during catalysis in reactions using Pd(II) precatalysts. In these catalytic reactions, Pd(I) μ-allyl dimer formation is a deleterious process which removes the IPr-Pd(0) active species from the reaction mixture. However, increased sterics at the 1-position of the allyl ligand in the Pd(IPr)(η(3)-crotyl)Cl and Pd(IPr)(η(3)-cinnamyl)Cl precatalysts results in a larger kinetic barrier to comproportionation, which allows more of the active IPr-Pd(0) catalyst to enter the catalytic cycle when these substituted precatalysts are used. Furthermore, we have developed reaction conditions for the Suzuki-Miyaura reaction using Pd(IPr)(η(3)-cinnamyl)Cl which are compatible with mild bases.


Journal of the American Chemical Society | 2018

N-Hydroxyphthalimide-Mediated Electrochemical Iodination of Methylarenes and Comparison to Electron-Transfer-Initiated C–H Functionalization

Mohammad Rafiee; Fei Wang; Damian P. Hruszkewycz; Shannon S. Stahl

An electrochemical method has been developed for selective benzylic iodination of methylarenes. The reactions feature the first use of N-hydroxyphthalimide as an electrochemical mediator for C-H oxidation to nonoxygenated products. The method provides the basis for direct (in situ) or sequential benzylation of diverse nucleophiles using methylarenes as the alkylating agent. The hydrogen-atom transfer mechanism for C-H iodination allows C-H oxidation to proceed with minimal dependence on the substrate electronic properties and at electrode potentials 0.5-1.2 V lower than that of direct electrochemical C-H oxidation.


Organometallics | 2012

Mechanistic Studies of the Insertion of CO2 into Palladium(I) Bridging Allyl Dimers

Damian P. Hruszkewycz; Jianguo Wu; Jennifer C. Green; Nilay Hazari; Timothy J. Schmeier


Organometallics | 2010

The Reaction of Carbon Dioxide with Palladium−Allyl Bonds

Jianguo Wu; Jennifer C. Green; Nilay Hazari; Damian P. Hruszkewycz; Christopher D. Incarvito; Timothy J. Schmeier


ACS Catalysis | 2015

Design of a Versatile and Improved Precatalyst Scaffold for Palladium-Catalyzed Cross-Coupling: (η3-1-tBu-indenyl)2(μ-Cl)2Pd2

Patrick R. Melvin; Ainara Nova; David Balcells; Wei Dai; Nilay Hazari; Damian P. Hruszkewycz; Hemali P. Shah; Matthew T. Tudge


Synlett | 2011

Pd(I)-Bridging Allyl Dimers:A New System for the Catalytic Functionalization of Carbon Dioxide

Nilay Hazari; Damian P. Hruszkewycz; Jianguo Wu


Organometallics | 2015

Effect of 2-Substituents on Allyl-Supported Precatalysts for the Suzuki–Miyaura Reaction: Relating Catalytic Efficiency to the Stability of Palladium(I) Bridging Allyl Dimers

Damian P. Hruszkewycz; Louise M. Guard; David Balcells; Nicola Feldman; Nilay Hazari; Mats Tilset


Chemical Society Reviews | 2016

Dinuclear PdI complexes with bridging allyl and related ligands

Nilay Hazari; Damian P. Hruszkewycz


Organometallics | 2013

Synthesis, Electronic Structure, and Reactivity of Palladium(I) Dimers with Bridging Allyl, Cyclopentadienyl, and Indenyl Ligands

Matthew J. Chalkley; Louise M. Guard; Nilay Hazari; Peter Hofmann; Damian P. Hruszkewycz; Timothy J. Schmeier; Michael K. Takase

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Shannon S. Stahl

University of Wisconsin-Madison

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