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What the Heck! A catalytic system composed of a Pd complex with a basic, hindered alkyl phosphine ligand is capable of promoting Heck coupling of nonactivated vinyl tosylates and phosphates with electron-deficient olefins. An unexpected 1,2-migration of the alkenyl PdII intermediates (see Scheme) leads to the isomerized Heck coupling product.
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Ebran et al. (2006) studied this question.
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