Combined forces: Theory and experiment are used together to determine the mechanism of primary amino acid catalyzed intermolecular aldol reactions. A six-membered chairlike structure is determined to be the transition state for the reaction between benzaldehyde and cyclohexanone catalyzed by (S)-alanine (see scheme), and a carboxylic acid catalyzed enamine mechanism is shown to be the most favorable reaction pathway.
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Bassan et al. (2005) studied this question.
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