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Direct Comparison of Hydrogenation Catalysis by Intact versus Fragmented Triruthenium Clusters
Author(s) -
Blazina Damir,
Duckett Simon B.,
Dyson Paul J.,
Lohman Joost A. B.
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20011015)40:20<3874::aid-anie3874>3.0.co;2-9
Subject(s) - catalysis , selectivity , solvent , spin isomers of hydrogen , chemistry , fragmentation (computing) , polar , photochemistry , cluster (spacecraft) , substrate (aquarium) , solvent effects , polarization (electrochemistry) , hydrogen , organic chemistry , physics , oceanography , astronomy , computer science , programming language , operating system , geology
The solvent plays a pivotal role in controlling the selectivity of the catalytic hydrogenation of alkenes and alkynes by [Ru 3 (CO) 12− x (PPh 3 ) x ] ( x =1 or 2) with the mechanism varying with the solvent polarity. In polar solvents the reaction proceeds via H 2 addition products based on [Ru 3 (H)( μ ‐H)(CO) 9 (PPh 3 ) 2 ], as demonstrated by parahydrogen‐induced polarization (PHIP). In nonpolar solvents catalysis by [RuH 2 (CO) 2 (PPh 3 )(substrate)], resulting from fragmentation, competes with that by the intact cluster.