Chiral bicyclic 1,2,4-triazolium salts having a defined face of the heterocyclic ring hindered have been synthesised and they catalyse the benzoin condensation in good yield; the enantiomeric excesses obtained (up to 80%) are much better than with closely related thiazolium salts and the opposite enantiomer of benzoin predominates.
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Knight et al. (1998) studied this question.
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