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Rounding up: An efficient copper-catalyzed cyclic oxytrifluoromethylation of 2,3-allenoic acids under mild conditions, providing a straightforward approach to β-trifluoromethylated butenolides has been developed. Based on the successful trapping of a CF3 radical intermediate, a mechanism involving π-allylic copper(III) or radical intermediate is proposed.
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Yu et al. (2013) studied this question.
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