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Dual action: the Lewis acid CuF(2) ⋅2 H(2)O efficiently catalyzes the reaction between electrophilic fluoroalkylating agents and α,β-unsaturated carboxylic acids by dually activating both reactants, thus affording di- and trifluoromethyl alkenes in high yields with excellent E/Z selectivity.
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He et al. (2012) studied this question.
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