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2004
Hydrogenation
O 0220
Development of DIOP Derivatives as Efficient Ligands for Asymmetric HydrogeFactors Controlling the Reactivities and Enantioselectivities. — The effi47- 040 nation:
cient enantioselectivity observed in Rh-catalyzed hydrogenation of enamides of type
(II) and (IV) using the new DIOP derivatives (Ia) and (Ib) indicates that conformational
rigidity of chiral ligand plays a significant role in governing the catalytic reactivity and
enantioselectivity. The isolated pure Rh-ligand complexes show higher reactivity and
selectivity than the Rh complexes generated in situ. (Ib) also induces high enantioselectivity in Ir-catalyzed hydrogenation of the cyclic imine (VI). — (LIU, D.; LI, W.;
ZHANG*, X.; Tetrahedron: Asymmetry 15 (2004) 14, 2181-2184; Dep. Chem., Pa.
State Univ., University Park, PA 16802, USA; Eng.) — Jannicke
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