PNNP Macrocycles: A New Class of Ligands for Asymmetric Catalysis

2009-03-09T00:00:00Z (GMT) by Marco Ranocchiari Antonio Mezzetti
We report the first examples of enantiomerically pure P<sub>2</sub>N<sub>2</sub> macrocycles containing either a diimino (<b>1a</b>) or diamino donor set, as well as their ruthenium(II) dichloro complexes. Unexpectedly, the diimino derivative <b>2a</b> is a more efficient catalyst in the transfer hydrogenation of acetophenone than its diamino analogue.