Abstract
AbstractBase‐free palladium‐catalyzed reactions of aryl chlorides with pinacol borane have been found to give the hydrodechlorinated products while similar reactions of aryl halides with pinacol borane in the presence of a base were reported to result in borylation. The base‐free conditions offer reasonable functional group compatibility. Experimental studies suggest that smooth and selective hydride transfer from pinacol borane to arylpalladium chloride under base‐free conditions is promoted by a strong interaction between the Lewis acidic boron and the chlorine on the palladium.
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