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Decomposition of azidothiophenes (3) gives the thieno[3,2-c][1λ4, 2]thiazines (4), which are stable cyclic sulphimides, the ylidic nature of (4a) being confirmed by its properties and X-ray structure determination; photolysis of the sulphimides (4) gives the thieno[3,2-b]pyrroles (6) suggesting that MeS and PhS undergo very rapid [1,5] sigmatropic shifts.
C. J. Moody, C. W. Rees, S. C. Tsoi and D. J. Williams, J. Chem. Soc., Chem. Commun., 1981, 927 DOI: 10.1039/C39810000927
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