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An alternative mechanism is conceivable; the arylpalladium bromide A acts as an electrophile to place the palladium on the carbon, β to boron and induces migration, of a phenyl group on boron to the α-carbon. A similar mechanism has been assumed for analogous reactions of alkynylborates with alkyl halides, most of which lacked in stereoselectivity. The high stereoselectivity obtained in the present reaction led us to favor the mechanism proposed in the text.
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