Polymer-supported quaternary ammonium cyanides, active as catalysts in the benzoin condensation, were prepared by using a Merrifield resin as starting material. Participation of the ammonium counter-ion in the transition state of the benzoin condensation is shown by the optical activity of benzoin when a chiral ammonium cyanide is used as the catalyst.
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Castells et al. (1984) studied this question.
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