Browsing by Author "Coperet, Christophe"

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Silica-Supported Cu Nanoparticle Catalysts for Alkyne Semihydrogenation: Effect of Ligands on Rates and Selectivity
(2016-12-21)
Fedorov, Alexey
;
Liu, Hsueh-Ju
;
Lo, Hung-Kun
;
Coperet, Christophe
;
應用化學系
Narrowly dispersed, silica-supported Cu nano particles (ca. 2 nm) prepared via surface organometallic chemistry from a mesityl complex [Cu(5)Mes(5)] are highly active for the hydrogenation of a broad range of alkynes. High-throughput experimentation allows for identifying the optimal ligand and reaction conditions to turn these supported Cu nanoparticles into highly chemo- and stereoselective catalysts for the preparation of Z-olefins (overall, 23 examples). For instance, PCy3-modified Cu nanoparticles semihydrogenate 1-phenyl-l-propyne to cis-beta-methylstyrene (20 bar H-2, 40 degrees C) with turnover number and turnover frequency of ca. 540 and 1.9 min(-1), respectively, and with 94% selectivity at full conversion.