Among carbonyl compounds esters are not usually involved in tautomeric equilibrium with the exception of β-ketoesters and thioesters. We show that mass spectrometry data are helpful in demonstrating the occurrence of the enol structure for thioesters, particularly significant for the dithio analogues. AM1 semiempirical MO calculations are also consistent with the experimental results.

Contribución de la harina de trigo enriquecida y derivados a los requerimientos de hierro en niños de 6 meses a 7 añosContribution of enriched wheat flour and flour products to iron requirements in children aged 6 months to 7 years a.