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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, BASTIDA, David, BURÉS AMAT, Jordi, ISART GARRIGA, Carles, PINEDA, Oriol, VILARRASA I LLORENS, Jaume. Relative tendency of carbonyl compounds to form enamines. _Organic Letters_. 2012. Vol. 14, núm. 2, pàgs. 536-539. [consulta: 24 de gener de 2026]. ISSN: 1523-7060. [Disponible a: https://hdl.handle.net/2445/158643]

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