Nan Zhang, Weiying He, Kristof M. Altus, Brian O. Patrick, Benjamin S. Gelfand, Pierre Kennepohl, Jennifer A. Love
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引用次数: 0
摘要
螯合 N-杂环碳烯铂(II)二甲基络合物与苯基碘化物和过量 KI 反应后,可通过 1H NMR 光谱直接检测到铂(IV)苯基中间体。这一发现提供了实验证据,证明铂(II)二甲基络合物与芳基卤化物之间的反应是通过协同氧化加成(OA)机制进行的。此外,我们还报告了 Csp3-I 与 Csp2-Csp3 和 Csp3-Csp3 键的选择性还原消除 (RE)。最后,我们通过计算方法研究了 OA、不同 RE 途径和不同异构体的反应性,结果与实验观察结果一致。我们认为这些结果对开发新的铂催化转化具有重要意义。
Direct Detection of Pt(IV) Phenyl Complexes upon Intermolecular Oxidative Addition of Aryl Halides and Selective Csp3–I versus Csp2–Csp3 and Csp3–Csp3 Bonds Reductive Elimination from N-Heterocyclic Carbene Pt(IV) Phenyl Complexes
Reaction of a chelating N-heterocyclic carbene Pt(II) dimethyl complex with phenyl iodide and excess KI results in the direct detection of a Pt(IV) phenyl intermediate by 1H NMR spectroscopy. This finding provides experimental evidence that the reaction between Pt(II) dimethyl complexes and aryl halides proceeds via a concerted oxidative addition (OA) mechanism. Additionally, we report on the selective reductive elimination (RE) of Csp3–I vs Csp2–Csp3 and Csp3–Csp3 bonds. Lastly, OA, different RE pathways, and reactivity of different isomers were investigated by computational methods that are consistent with experimental observations. We believe that these results have important implications for the development of new Pt-catalyzed transformations.
期刊介绍:
Organometallics is the flagship journal of organometallic chemistry and records progress in one of the most active fields of science, bridging organic and inorganic chemistry. The journal publishes Articles, Communications, Reviews, and Tutorials (instructional overviews) that depict research on the synthesis, structure, bonding, chemical reactivity, and reaction mechanisms for a variety of applications, including catalyst design and catalytic processes; main-group, transition-metal, and lanthanide and actinide metal chemistry; synthetic aspects of polymer science and materials science; and bioorganometallic chemistry.