reaction. The first step, decarboxylative palladation, is proposed to occur through an intramolecular electrophilic palladation pathway, which is supported by computational and mechanism studies. In contrast to the reverse reaction (C–H insertion), the data support an electrophilic aromatic substitution mechanism involving a stepwise intramolecular protonation sequence for the protodepalladation portion of
描述了温和的
钯催化芳族
羧酸脱羧的机理研究。特别地,确定了转化的两个阶段的反应顺序和活化参数。这些研究指导了能够转换的催化系统的开发。进一步的证据表明,第二阶段,即芳基
钯中间体的质子化,是反应的速率决定步骤。第一步,脱羧
钯化,被提议通过分子内亲电
钯化途径发生,这得到了计算和机制研究的支持。与逆反应(C-H 插入)相反,数据支持亲电芳香取代机制,涉及反应的原脱
钯部分的逐步分子内质子化序列。