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It's an affair of four: The study of nonlinear effects in the proline–thiourea‐catalyzed aldol reaction between acetone and aromatic aldehydes, together with NMR and ESI‐MS experiments, shows that the main role of the thiourea co‐catalyst is that of promoting both the formation of a soluble Seebach's oxazolidinone intermediate and its conversion into the iminium carboxylate isomer.
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