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Séminaire Chimie ED459 / Chaire Total

Information-rich experimental methods for examining catalytic reactions

Prof. Clark Landis (University of Wisconsin-Madison, USA / Prof. invité Chaire Total Balard)

publié le

Le Jeudi 13 novembre 2014 à 13h45
UM2, salle de cours SC-25.01

Critical attributes of useful chemical processes include high atom economy, catalytic use of expensive reagents, selectivity, building complexity from simplicity, and simple separations. Enantioselective hydroformylation — by which enantiopure transition metal complexes selectively catalyze the conversion of simple alkenes, dihydrogen, and carbon monoxide into chiral aldehydes — possesses many of these attributes. Catalysts based on rhodium complexes of 3,4-diazaphospholanes are highly active and selective for the hydroformylation of simple alkenes such as allyl ethers, vinyl acetates, vinyl enamides, aryl alkenes, and 1,3 dienes. Some substrates exhibit puzzling changes in selectivity with reaction conditions, especially changes in CO partial pressure. What is the origin of these changes ? Traditional mechanistic approaches provide compelling suggestions but these methods are slow and impractical in many industrial environments. New developments from our laboratory seek to make collection of more detailed information easier and faster. These information-rich technologies include in situ high-pressure NMR reactors, stopped-flow NMR, and new methods for rapid evaluation of kinetics and mechanism of polymerization using GPC and polymer labeling techniques.

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Contact local ICGM : Prof. Éric Clot (équipe CTMM)


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