Convincing evidence is presented that the o-dinitroso intermediate involved in the exchange of the 1-oxide and 3-oxide tautomers of 6-nitro[2,1,3]oxadiazolo[4,5-b]pyridine 1-oxide 5 is the precursor of the Diels–Alder diadduct 7 isolated upon treatment of this compound with cyclohexadiene in CHCl3.
M. Sebban, R. Goumont, J. Claude Hallé, F. Terrier and J. Marrot, Chem. Commun., 1999, 1009 DOI: 10.1039/A902170A
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