Chiral β-phosphinocarboxylic acids, conveniently available by conjugate addition of lithium diarylphosphides to α,β-unsaturated carboxylic esters from the chiral pool, show excellent potential as ligands in asymmetric catalysis; in Pd-catalysed allylic substitutions extremely high enantiomeric excess (up to > 99% e.e.) is achieved with cyclic substrates.
G. Knühl, P. Sennhenn and G. Helmchen, J. Chem. Soc., Chem. Commun., 1995, 1845 DOI: 10.1039/C39950001845
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