Das Phenylmethylenpyran (I) reagiertmit Hydroxylaminhydrochlorid zu 857 des Pyridinoxids (II), das auch aus dem Cyclohexanon‐Derivat (III) unter glei chen Bedingungen mit Hydroxylamin entsteht.
2,5,6‐Trisubstituierte und 2,6‐disubstituierte 4‐(2‐Oxo‐alkyliden)‐Pyrane setzen sich mit Hydroxylamin zu Oximen von 4‐(2‐Oxo‐alkyliden)‐Pyridin‐N‐oxiden oder/und Isoxazolinen um.
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