Arene hydrogenation in a room-temperature ionic liquid using a ruthenium cluster catalyst

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Abstract
The air and moisture stable system [bmim][BF4]–[Ru4(η6-C6H6)4][BF4] {[bmim]+ = 1-butyl-3-methylimidazolium cation} presents a novel medium for conducting hydrogenations of arenes; the environmental problems associated with related aqueous–organic biphasic regimes are eliminated.