Abstract
Abstract Visible, IR, and PMR spectra of 2,4-dinitrophenylhydrazones (DNPH) of some pyruvic esters were studied. It is suggested that each α-isomer with a higher Rf-value involves an intramolecular hydrogen bond between the imino hydrogen and the ester carbonyl group, to which the Z-structure is assigned. The E-structure is assigned to each β-isomer with a lower Rf-value.
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