Abstract
Oxidative cyclization of 5 with Mn(OAc) 3 ·2H 2O gives mainly the bicyclic products 7 and 8. On the other hand, oxidative cyclization of 16 and 17 gives mainly the lactones 18 and 20. These data suggest that oxidation of a monocyclic radical to a cation precedes cyclization to form 3, 4, 7, and 8.
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