Comparison of X-ray structural data for 5-methyl-3-phenyl-5H-thiapyrano[3,2-b]quinoline SS-dioxide (I) and 3-phenyl-2H-thiapyrano[3,2-b]quinoline SS-dioxide (II) shows that extended π-delocalisation involving the sulphonyl group is present in the first compound.
G. D. Andreetti, G. Bocelli and P. Sgarabotto, J. Chem. Soc., Chem. Commun., 1974, 586 DOI: 10.1039/C39740000586
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