Treatment of allylic ether of 2-iodophenol or 2-haloethanal allylic acetal with phosphinic acid, a base and a radical initiator (AIBN or triethylborane) in aqueous ethanol provided the corresponding radical cyclization product in excellent yield. An addition of a base is critical to employ phosphinic acid as a radical mediator.
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Yorimitsu et al. (2000) studied this question.
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