A Versatile and High‐Yield Route to Active and Well‐Defined Catalysts [Ru(bisphosphane)(H)(solvent)
<sub>3</sub>
](BF
<sub>4</sub>
)
作者:Jason A. Wiles、Steven H. Bergens、Koenraad P. M. Vanhessche、Daniel A. Dobbs、Valentin Rautenstrauch
DOI:10.1002/1521-3773(20010302)40:5<914::aid-anie914>3.0.co;2-#
日期:2001.3.2
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 ⋅Et2 O 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-C8 H11 ')]+ (C8 H11 '=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.