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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.
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Knühl et al. (1995) studied this question.
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