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The hydroxymethyl-quinuclidine fragment in quatemary ammonium fluorides derived from cinchona alkaloids proved to play an important role on the stereochemical course in the fluoride ion catalyzed aldol reactions.We have already revealed1 that catalytic asymmetric aldol reactions of en01 silyl ethers with benzaldehyde have been accomplished in good enantiomeric excesses by utilizing a quaternary ammonium fluoride . ., , .
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Shioiri et al. (1996) studied this question.
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