2-Acetyl-3,4-dihydropyrans, synthesized from acetylene and ketones in two steps, react with hydroxylamine to afford 5-hydroxy-1,6-heptanedione dioximes (E,E-isomers) in 72–96% yields. Click to show full abstract
2-Acetyl-3,4-dihydropyrans, synthesized from acetylene and ketones in two steps, react with hydroxylamine to afford 5-hydroxy-1,6-heptanedione dioximes (E,E-isomers) in 72–96% yields.
               
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