Fluorenethione S-oxide undergoes (2 + 4) cycloadditions with azoalkenes to yield 2H-1,2,3-thiadiazine 1-oxides together with a small amount of the regioisomeric 6H-1,3,4-thiadiazine 1-oxides. Fluorenethione, with azoalkenes, undergoes (2 + 4) regiospecific cycloaddition reactions leading to the formation of 6H-1,3,4-thiadiazine derivatives. Diarylsulphines and diarylthiones fail to react with azoalkenes.
B. F. Bonini, G. Maccagnani, G. Mazzanti, G. Rosini and E. Foresti, J. Chem. Soc., Perkin Trans. 1, 1981, 2322 DOI: 10.1039/P19810002322
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