Tetracyclone forms tetraphenyl-2-pyridone and tetraphenyl-2-pyridyl sulphonates with sulphonyl nitrenes, and traps intermediate azepines as the (4 + 2)π and (6 + 4)π adducts and benzyne from benzene-o-disulphonyl azide; no benzyne is formed in the hydrogen-abstraction by sulphonyl nitrenes from benzene.
R. A. Abramovitch and G. N. Knaus, J. Chem. Soc., Chem. Commun., 1974, 238 DOI: 10.1039/C39740000238
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