Eight molecules with different conformations are present in the unit cell of the Pt complex 1, which contains a mismatched arrangement of the chiral ligands Chiraphos and Binol (i.e., (S,S)-Chiraphos prefers the δ conformation, whereas (R)-Binol tends to induce the λ conformation in the diphosphane). The observed flexibility of these bidentate ligands should not be disregarded in stereochemical models for explaining the selectivity in asymmetric catalysis.
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