This rate-determining step yields a % hydroxyethyl palladium species as an intermediate and this can transform by a series of hydrogen shiftsinto a weak complex of acetaldehyde and palladium.

• 这个速率控制步骤产生了作为中间体的乙烷基钯，而转换是通过一连串的氢转移到乙醛和钯的弱配合物完成的。