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Fluorous chiral BINOLs were prepared and used as the ligands for the titanium catalyzed asymmetric addition of Et 2 Zn to aromatic aldehydes. Consecutive reactions were examined by utilizing fluorous-organic biphase and fluorous solid phase extraction techniques. Enantioselectivities were similar in consecutive reactions and were close to that attained in the non-fluorous system. The solid...
Enantioselectivities near maximum values were obtained in the catalytic reaction by a rapid addition of a fluorous achiral alcohol (Rfh 3 C-OH) to the reaction mixture: for DHPEX in Rfh 3 C-OH/THF solid-liquid biphase system and for a fluorous chiral alcohol in THF/FC-72 liquid-liquid biphase system.
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