Technical Notes:

1. The Noyori (diphosphine) RuClz (diamine) catalysts containing the chiral ligand Xylyl-Phanephos display exceptional activity and enantioselectivity in the asymmetric hydrogenation of a wide range of aromatic, heteroaromatic and a,ß-unsaturatedketones.

2.Reactions are performed under mild conditions at room temperature and typically at low Hz pressures of 2-10 bar. substrate concentrations of up to 40% w/v are tolerated

3.Molar substrate/catalyst ratios of up to 1 00,000/1 are achieved with excellent reactivity and enantioselectivity using commercial grade substrates and solvents.

References:

1.Org. Lett.. 2000, 2. 4173.

2.Burk, M.J.; Hems. w.; Zanotti-Gerosa, A. PCT WO/0 174829 A1, 2001.

3.Org. Proc. Res. Dev.. 2003, 7, 89.