synthesized. Evaluation of their reactivity toward different metal centers provides evidence that the dicationic fragment, otherwise reluctant to coordinate metals, readily participates in the formation of chelates when embedded into such a scaffold. Moreover, it significantly enhances the Lewis acidity of the metals to which it coordinates. This property has been used to develop a Rh catalyst that efficiently
                                    由双阳离子-[P(H2Im)2]+2 单元(H2Im = 1,3-二甲基-4,5-二氢
咪唑-2-亚基)和连接的-PPh2 基团构成的一系列新的P^P-螯合
配体通过结构不同的主链已经被合成。评估它们对不同
金属中心的反应性提供了证据,表明双阳离子片段,否则不愿意配位
金属,当嵌入这种支架时很容易参与螯合物的形成。此外,它显着增强了与其配位的
金属的
路易斯酸度。这一特性已被用于开发一种 Rh 催化剂,该催化剂可有效触发二烯与富电子芳香分子的加氢芳基化反应。动力学研究和
氘标记实验,以及密度泛函理论计算,