Abstract
AbstractMethyl 2‐allyl‐3‐oxo‐2,3‐dihydrothiophene‐2‐carboxylate (2) photocyclizes selectively to methyl 2‐oxo‐7‐thiatricyclo[3.2.1.03,6]octane‐1‐carboxylate (4). In contrast, 4‐thia‐2‐cyclohexenone 3, on irradiation, affords only low yields of dimers, cycloadducts (2‐methylpropene) or RH reduction products (i‐ProH).
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