What leaving group? Organic halides and allylic esters undergo efficient Pd-catalyzed Heck reactions under mild conditions in air to form a new CC bond without elimination of the β-OAc group in the intermediate palladium complex. Instead a highly regioselective β-H elimination takes place to provide substituted derivatives of allylic alcohols (see scheme).
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Pan et al. (2008) studied this question.
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