SCHEDULED MAINTENANCE:
The enethione arising from thermal ring-cleavage fragmentation of 2-azidobenzo [b]thiophene reacts with open chain and cyclic dienophiles to give thiochromans in fairly good yields.
P. Spagnolo and P. Zanirato, J. Chem. Soc., Chem. Commun., 1985, 1441 DOI: 10.1039/C39850001441
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