Abstract
Application of new ligands ( R)-(−)- 8 , ( S)-(+)- 16 , and ( S)-(+)- 17 to the title reaction ( 1 or 2 → 3 ) led to excellent regio- and enantioselectivities (>30:1; ≤98% ee); although lacking the C 2-symmetry, the catalysts can be viewed as quasi- C 2-symmetrical since the single chiral center is sufficient to determine the sense of wrapping of the metal by the ligand.
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