96497-89-1Relevant articles and documents
Stable Quinonoid Nitronates. A Structure Investigation of Ethyl 2-Nitrophenylpyruvate Anions based on Nuclear Magnetic Resonance Spectroscopy and MO-SCF-HAM/3 Calculations
Bergman, Jan,Sand, Peter
, p. 93 - 96 (1985)
Ethyl 2-nitrophenylpyruvate anions have o-quinonoid nitronate structures while their corresponding acids are aromatic α-enol and/or α-keto-esters.A semiempirical quantum chemical study of the different tautomers of these systems using HAM/3 has suggested a non-planar ring conformation of the nitronic acids and the nitronates.The presence of a hydrogen bond between 6-H and its neighbouring carbonyl oxygen in the title compound is inferred by an unusually low field proton resonance.