Asymmetric hydrogenation of acrylic acid derivatives by novel chiral rhodium–phosphinediamine complex catalysts by selective ligation between two amino units of the ligand and electrostatic interaction

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Abstract
The novel chiral phosphinediamine ligand (PN2) having two amino units has been readily prepared from (S)-1-phenylethylamine derivatives and dichlorophosphine. In the hydrogenation of acrylic acids by a rhodium–PN2 catalyst, high enantioselectivities were achieved by the effective chiral field formed through selective P-N chelation and electrostatic interaction between the amino unit of the ligand and the carboxy unit of the substrate.

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