The palladium‐catalyzed C−H oxidation of simple arenes is an attractive strategy to obtain phenols, which have many applications in the fine chemicals industry. Although some advances have been made in this research area, low reactivity and selectivity are, in general, observed. This report describes a new catalytic system for the efficient C−H acetoxylation of simple arenes based on Pd(OAc)2 and a
Platinum and Palladium Complexes Containing Cationic Ligands as Catalysts for Arene H/D Exchange and Oxidation
作者:Marion H. Emmert、J. Brannon Gary、Janette M. Villalobos、Melanie S. Sanford
DOI:10.1002/anie.201002351
日期:2010.8.9
Cationic catalysts in HD: Palladium(II) and platinum(II) complexes of pyridinium‐substituted bipyridine ligands are highly active and stable catalysts for H/D exchange and oxidation of aromatic CH bonds (TONs up to 3200, TOFs up to 0.1 s−1; see scheme, EWG=electron‐withdrawing group, EDG=electron‐donating group).
在HD阳离子催化剂:钯(II)和铂(II)吡啶基取代的联吡啶配体的复合物对于H / d交换和芳族C氧化高活性和稳定的催化剂 H键(吨高达3200,的Tofs高达0.1 s -1 ;参见方案,EWG =吸电子基团,EDG =给电子基团)。
Remarkably High Reactivity of Pd(OAc)2/Pyridine Catalysts: Nondirected CH Oxygenation of Arenes
作者:Marion H. Emmert、Amanda K. Cook、Yushu J. Xie、Melanie S. Sanford
DOI:10.1002/anie.201103327
日期:2011.9.26
general applicability of the catalytic system Pd(OAc)2/pyridine is described (see scheme). The catalyst shows excellent reactivity in the CHoxygenation of simple aromatic substrates. The Pd/pyridine ratio is critical as the use of one equivalent of pyridine per Pd center leads to dramatic enhancements in both reactivity and site selectivity in comparison to Pd(OAc)2 alone.
<scp>Palladium‐catalyzed</scp>
C
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H acetoxylation of arenes using a pyrazolonaphthyridine ligand
作者:Jisu Kim、Jung Min Joo
DOI:10.1002/bkcs.12599
日期:2022.10
Herein, Pd-catalyzed CH acetoxylation reactions of arenes are developed using a pyrazolonaphthyridine ligand. In the presence of iodomesitylene diacetate as the oxidant, the electron-deficient ligand facilitates the CH activation of the electron-rich positions while preventing the formation of Pd black via bidentate binding. Although both acetic acid and hexafluoroisopropanol are employed for directing
在此,使用吡唑并萘啶配体开发了 Pd 催化的芳烃 C H 乙酰氧基化反应。在碘代三亚甲基二乙酸酯作为氧化剂存在的情况下,缺电子配体促进富电子位置的 CH 活化,同时通过双齿结合防止 Pd 黑的形成。尽管乙酸和六氟异丙醇都用于指导基团辅助的乙酰氧基化反应,但后者被证明对于芳烃与氮配体的非定向反应更有效。
Vorlaender; Walter, Zeitschrift fur Physikalische Chemie, Stoechiometrie und Verwandtschaftslehre, 1925, vol. 118, p. 10