The 1,4,6,7-dioxadiazocin structure (3), which was originally assigned to the photo-isomers of pyridazine 1,2-dioxide (1), is incorrect; chemical data and X-ray analysis show the correct structure to be 3a,6a-dihydroisoxazolo[5,4-d]isoxazole (2).
H. Arai, A. Ohsawa, K. Saiki, H. Igeta, A. Tsuji, T. Akimoto and Y. Iitaka, J. Chem. Soc., Chem. Commun., 1977, 856 DOI: 10.1039/C39770000856
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