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2004
Enantioselective syntheses
O 0031
Enantioselective Catalysis. Part 156. Ruthenium Procatalysts and 2-PyridineCocatalysts in the Transfer Hydrogenation of
44- 033 aldehyde/(S)-NOBIN-Derived
Acetophenone with 2-Propanol. — RuCl2(Ph3)3 is found to be the best procatalyst in
the transfer hydrogenation of acetophenone (I) with 2-propanol in the presence of
(S)-NOBIN ligands. The triphenylphosphane ligands are crucial for the catalytic activity and take part in the chirality transfer. Triphenylphosphane removing agents such as
CuCl, TEMPO or trimethylamine oxide improve the catalytic performance to enantioselectivities up to 99%. Some new NOBIN ligands with additional chiral centers are
synthesized but do not improve the selectivities. — (BRUNNER*, H.; HENNING, F.;
Monatsh. Chem. 135 (2004) 7, 885-897; Inst. Anorg. Chem., Univ. Regensburg,
D-93053 Regensburg, Germany; Eng.) — Kieslich
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