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Simple and efficient: Protonation of [Ru(1,2:5,6-η-cod)(η6-cot)] (cod=1,5-cyclooctadiene, cot=1,3,5-cyclooctatriene) with HBF4⋅Et2O and then reaction with chiral bisphosphane ligands (=Me-DuPHOS, BINAP, Tol-BINAP, JOSIPHOS) affords the corresponding [Ru()(H)(η6-cot)]+ or [Ru()(1,2,3,4,5-η-C8H11′)]+ (C8H11′=2,4-cyclooctadienyl; see scheme). Exposure of these cations to H2 in solvents (sol) such as acetone, methanol, and THF affords [Ru()(H)(sol)3]+, which are catalysts for (amongst other things) enantioselective hydrogenations of alkenes.
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Wiles et al. (2001) studied this question.
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