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β-Hydride abstraction is a well-accepted elementary step for catalytic cycles in organometallic chemistry.It is usually anticipated that alkylpalladium halides containing syn-β-hydrogens will undergo β-hydride abstraction to afford the Heck-type products.However,this study discloses that the above general knowledge is only conditionally correct.Our experimental results demonstrate that the reductive elimination of alkylhalides from alkylpalladium halides containing syn-β-hydrogens may surpass the β-hydride abstraction or even become exclusive in certain cases.1,2 In combination with a DFT study,this presentation will discuss factors that control reductive llimination vs β-hydride abstraction of alkylpalladium(Ⅱ) halide complexes with accessible β-hydrogens.