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Wiles, Jason A.; Bergens, Steven H.; Vanhessche, Koenraad P. M.; Dobbs, Daniel A.; Rautenstrauch, Valentin
Angewandte Chemie (International ed.), March 2, 2001, Letnik: 40, Številka: 5Journal Article
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 ($_{\rm PP}^{\frown }$=Me‐DuPHOS, BINAP, Tol‐BINAP, JOSIPHOS) affords the corresponding Ru($_{\rm PP}^{\frown }$)(H)(η6‐cot)+ or Ru($_{\rm PP}^{\frown }$)(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($_{\rm PP}^{\frown }$)(H)(sol)3+, which are catalysts for (amongst other things) enantioselective hydrogenations of alkenes.
