A computational and experimental approach was employed to study the mechanism of the palladium(0)-catalyzed fluorination of allylic chlorides with AgF as fluoride source. Our findings indicate that an allylpalladium fluoride is a key intermediate necessary for the generation of both the nucleophile and electrophile. Evidence was also obtained to support a homobimetallic mechanism in which C–F bond
采用计算和实验方法研究了以AgF为
氟化物源的
钯(0)催化烯丙基
氯化物
氟化的机理。我们的发现表明,烯丙基
氟化钯是亲核试剂和亲电试剂均必需的关键中间体。还获得了支持同双
金属机制的证据,其中中性烯丙基
钯氟化物对阳离子烯丙基
钯亲电试剂(以
氟化物为抗衡离子)的亲核攻击发生了C-F键的形成。根据该机理和计算出的过渡态,对在区域选择性
氟化中观察到的高支化选择性和异常
配体效应进行了评估。这些结果可能对其他过渡
金属催化的
氟化机理具有重要意义。