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[reaction: see text] Aryl chlorides bearing electron-withdrawing groups react with bis(pinacol)borane 1 to give aryl boronates in good to excellent yields in the presence of a catalyst formed in situ from Pd(OAc)(2) and the imidazolium chloride 2. The reaction is greatly accelerated when carried out under microwave heating.
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Fürstner et al. (2002) studied this question.
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