The unexpected transformation of 4-bromo-2,3-dihydrobenzo[b]thiepin-5(4H)-one (1) into 2,3-dihydro-[1]benzothieno[3,2-b]furan (2) and 1,1a,7,7a-tetrahydrobenzo[b]cyclopropa[e]thiopyran-7-one (3) is reported.
P. M. Weintraub and A. D. Sill, J. Chem. Soc., Chem. Commun., 1975, 784b DOI: 10.1039/C3975000784B
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