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Axially dissymmetric ligands with perfluoroalkyl groups, (Ra)-2,2′-bis[(R)-1-hydroxy-1H-perfluorooctyl]biphenyl [(Ra)-(R) 2 -1c] and its enantiomer, have been synthesized successfully by the coupling reaction of the corresponding aryl bromide using Ni(COD) 2 . These ligands showed much higher asymmetric induction in the reaction of various aldehydes with diethylzinc than the trifluoromethyl...
Axially dissymmetric ligand, (Ra)-2,2′-bis[(R)-1-hydroxy-1H-perfluorooctyl]-biphenyl (1), showing a high asymmetric induction, was found to be recovered quantitatively with a fluorous solvent from the reaction mixture owing to its high fluorine content. The recovered ligand 1 was pure enough to be reused without purification. The efficiency of 1 as the chiral ligand was not reduced at all even after...
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