Abstract
Optically active 1,1′-binaphthols (BINOLS) substituted at the 4,4′; 6,6′ and 4,4′,6,6′ positions with perfluoroalkyl groups have been synthesized. Asymmetric diethylzinc and triethyl aluminum addition to aryl aldehydes in a fluorous biphasic system catalyzed by these perfluoroalkyl-BINOL–titanium complexes have been accomplished with good enantiomeric excess obtained.
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