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MOP-phosphonites: a novel ligand class for asymmetric catalysis
Authors:Ficks Arne  Hiney Rachel M  Harrington Ross W  Gilheany Declan G  Higham Lee J
Affiliation:School of Chemistry, Bedson Building, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
Abstract:Chiral phosphonite ligands (S,R(b))-5a, (S,S(b))-5b, (R,R(b))-6a and (R,S(b))-6b are introduced, comprising a MOP-type backbone with a binol-based binaphthyl group bound to the phosphorus. Their reaction with [Pd(η(3)-C(4)H(7))Cl](2) affords η(3)-methallylpalladium chloride complexes 7a/b and 8a/b which have been isolated and structurally characterised. Solid-state and solution studies indicate subtle differences in their coordination behaviour, which ultimately affects their efficacy in the asymmetric hydrosilylation of styrene.
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