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The use of aryltrifluoroborates as coupling partners and O(2) as the oxidant substantially improves the scope and practicality of the Pd-catalyzed C-H activation/C-C coupling reaction. The newly discovered protocol made possible, for the first time, the ortho-coupling of electron-deficient arenes and phenyl acetic acids with organometallic reagents.
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Wang et al. (2008) studied this question.
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