During the preparation of benzo-condensed five-membered heterocycles by cycloaddition–extrusion reaction of benzyne with mesoionic compounds, a cycloadduct with a thiazol-4-one was isolated, which behaved differently on pyrolysis and photolysis.
S. Nakazawa, T. Kiyosawa, K. Hirakawa and H. Kato, J. Chem. Soc., Chem. Commun., 1974, 621a DOI: 10.1039/C3974000621A
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