Struktur und Reaktivität von 4-Hydroxy-5-oximino-7-methyl-5H-pyrano-[2.3-b]-pyridin-8-oxid / Structure and Reactivity of 4-Hydroxy-5-oximino-7-methyl-5H-pyrano-[2,3-b]-pyridine-8-oxide

For the reaction product of 1 with dimethylformamidedimethylacetal in the presence of hydroxylamine there might exist five possible tautomeric forms 2 a-e. The structure of the title compound was determined to be 2 d by applying carbon-13 NMR spectroscopy to 2 a-e and some derivatives 8-5 in DMSO-d6 resp. DMSO-d6/NaOD.