Publications de Xuemei Yang | EPFL Graph Search

Chlorination of arenes via the degradation of toxic chlorophenols

Paul Joseph Dyson, Mingyang Liu, Xuemei Yang

Aryl chlorides are among the most versatile synthetic precursors, and yet inexpensive and benign chlorination techniques to produce them are underdeveloped. We propose a process to generate aryl chlorides by chloro-group transfer from chlorophenol pollutan ...

2022

Elucidating the transition between CO2 physisorption and chemisorption in 1,2,4-triazolate ionic liquids at a molecular level

Paul Joseph Dyson, Zhaofu Fei, Xuemei Yang

Capture of CO2 is a crucial process to achieve carbon neutrality. High-performance CO2 capture involves both physi- and chemi-sorption, with a transition between them. However, the underlying mechanistic insights required to produce the methods to tune the ...

ELSEVIER SCIENCE SA2022

An Internal Fluorescent Probe Based on Anthracene to Evaluate Cation-Anion Interactions in Imidazolium Salts

Paul Joseph Dyson, Rosario Scopelliti, Zhaofu Fei, Wee Han Ang, Christian Hartinger, Xuemei Yang

A series of fluorescent imidazolium-based salts contg. the cation [AnCH2MeIm]+ (in which An=anthracene and Im=the imidazolium cation) with Cl-, BF4-, PF6-, SO3CF3-, [N(CN)2]-, [N(SO2CF3)2]-, or PhBF3- anions have been prepd. and characterized. X-ray diffra ...

2010

Nitrile-functionalized pyrrolidinium ionic liquids as solvents for cross-coupling reactions involving in situ generated nanoparticle catalyst reservoirs

Paul Joseph Dyson, Rosario Scopelliti, Zhaofu Fei, Ilaria Biondi, Christian Hartinger, Yuehui Li, Xuemei Yang, Yugang Cui, Manish Chaubey, Cinzia Chiappe

Nitrile-functionalized pyrrolidinium-based ionic liqs. were prepd. and characterized by spectroscopic methods and x-ray crystallog. The application of these new ionic liqs. as reaction media for Suzuki and Stille C-C cross-coupling reactions was studied an ...

Royal Society of Chemistry2010

Solvent-enhanced coupling of sterically hindered reagents and aryl chlorides using functionalized ionic liquids

Paul Joseph Dyson, Zhaofu Fei, Ning Yan, Yuehui Li, Xuemei Yang

A highly efficient and poison-resistant system for the Suzuki coupling reaction based on hydroxyl-functionalized ionic liq. solvents has been established. Coupling of RC6H4X (X = Br, I, Cl) and 2-bromothiophene with R1C6H4B(OH)2 in 2-hydroxyethyl-substitut ...

2009

Suzuki Coupling Reactions in Ether-Functionalized Ionic Liquids: The Importance of Weakly Interacting Cations

Paul Joseph Dyson, Zhaofu Fei, Andrew Douglas Phillips, Christian Hartinger, Yuehui Li, Xuemei Yang

Imidazolium- and pyridinium-based ionic liqs. with ether/polyether substituents have been evaluated as solvents for palladium-catalyzed Suzuki C-C coupling reactions. In general, reactions proceed more efficiently in these solvents compared to other ionic ...

2008

Palladium nanoparticles stabilized by an ionic polymer and ionic liquid: A versatile system for C-C cross-coupling reactions

Paul Joseph Dyson, Zhaofu Fei, Wee Han Ang, Dongbin Zhao, Yuehui Li, Xuemei Yang

Highly stable palladium nanoparticles 5 nm diam., protected by an imidazolium-based ionic polymer in a nitrile-functionalized ionic liq., have been prepd. and characterized by TEM. These Pd nanoparticles are excellent precatalysts for Suzuki, Heck, and Sti ...

2008

Biphasic Hydrogenation over PVP Stabilized Rh Nanoparticles in Hydroxyl Functionalized Ionic Liquids

Paul Joseph Dyson, Lioubov Kiwi, Gabor Laurenczy, Zhaofu Fei, Ning Yan, Rocio Micaela Crespo Quesada, Yuehui Li, Xuemei Yang

Polyvinylpyrrolidone stabilized rhodium nanoparticles are highly sol. in hydroxyl-functionalized ionic liqs., providing an effective and highly stable catalytic system. In hydrogenation reactions, excellent results were obtained, and transmission electron ...

2008