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A Comparison of Ruthenium‐Catalysed Arene Hydrogenation Reactions in Water and 1‐Alkyl‐3‐methylimidazolium Tetrafluoroborate Ionic Liquids
Author(s) -
Dyson Paul J.,
Ellis David J.,
Henderson William,
Laurenczy Gábor
Publication year - 2003
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200390015
Subject(s) - tetrafluoroborate , ionic liquid , chemistry , alkyl , chloride , catalysis , solvent , ruthenium , medicinal chemistry , organic chemistry , benzene , inorganic chemistry
The hydrogenation of benzene and other arene substrates under biphasic conditions is evaluated using the catalyst precursor Ru(η 6 ‐C 10 H 14 )(pta)Cl 2 (pta=1,3,5‐triaza‐7‐phosphaadamantane) immobilised in water and 1‐alkyl‐3‐methylimidazolium tetrafluoroborate ionic liquids. The effect that contamination of the 1‐alkyl‐3‐methylimidazolium tetrafluoroborate ionic liquids with chloride has on the hydrogenation reaction has also been examined. Of the immobilisation solvents tested the optimum solvent was found to be chloride‐free 1‐butyl‐3‐methylimidazolium tetrafluoroborate. Catalytic turnovers in this solvent are highest, and in general, turnovers for the hydrogenation reactions follow the trend: chloride‐free 1‐butyl‐3‐methylimidazolium tetrafluoroborate > water > chloride‐contaminated 1‐butyl‐3‐methylimidazolium tetrafluoroborate.