Treatment of 2,5-bis(alkylsulphinyl)-1,3,4-thiadiazole 1,1-dioxides with 6-dimethylaminofulvene in acetone gave 5,6-diaza-azulenes in good yields; solvent effects support a concerted mechanism for the formation of the cycloadducts.
M. Mori and K. Kanematsu, J. Chem. Soc., Chem. Commun., 1980, 873 DOI: 10.1039/C39800000873
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