Abstract
AbstractThe hydrogenation of benzene and other arene substrates under biphasic conditions is evaluated using the catalyst precursor Ru(η6‐C10H14)(pta)Cl2 (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.
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