The azathiabenzene derivatives (3), (7), and (11) rearrange on heating by a [1,4] shift of the sulphur substituent ot carbon rather than a [1,2] shift to nitrogen, even though for ylides (3) this rearrangement involves loss of thiophen and furan aromaticity.
R. D. Grant, C. J. Moody, C. W. Rees and S. C. Tsoi, J. Chem. Soc., Chem. Commun., 1982, 884 DOI: 10.1039/C39820000884
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