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Relative tendency of carbonyl compounds to form enamines

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Equilibria between carbonyl compounds and their enamines (from O-TBDPS-derived prolinol) have been examined by NMR spectroscopy in DMSO-d 6. By comparing the exchange reactions between pairs (enamine A + carbonyl B → carbonyl A + enamine B), a quite general scale of the tendency of carbonyl groups to form enamines has been established. Aldehydes quickly give enamines that are relatively more stable than those of ketones, but there are exceptions to this expected rule; for example, 1,3-dihydroxyacetone acetals or 3,5-dioxacyclohexanones (2-phenyl-1,3-dioxan-5-one and 2,2-dimethyl-1,3- dioxan-5-one) show a greater tendency to afford enamines than many α-substituted aldehydes

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SÁNCHEZ PÉREZ, Daniel, et al. Relative tendency of carbonyl compounds to form enamines. Organic Letters. 2012. Vol. 14, num. 2, pags. 536-539. ISSN 1523-7060. [consulted: 25 of May of 2026]. Available at: https://hdl.handle.net/2445/158643

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