Evaluation of the Synthetic Scope and the Reaction Pathways of Proton‐Coupled Electron Transfer with Redox‐Active Guanidines in C−H Activation Processes
Proton‐coupledelectrontransfer (PCET) is currently intensively studied because of its importance in synthetic chemistry and biology. In recent years it was shown that redox‐active guanidines are capable PCET reagents for the selective oxidation of organic molecules. In this work, the scope of their PCET reactivity regarding reactions that involve C−H activation is explored and kinetic studies carried
On the metal–ligand bonding in dinuclear complexes with redox-active guanidine ligands
作者:Lena Steuer、Elisabeth Kaifer、Hans-Jörg Himmel
DOI:10.1039/d1dt01354h
日期:——
redox-active ligands are currently intensively studied. Within this research theme, redox-active guanidines have been established as a new, eminent class of redox-active ligands. In this work the variation of metal-guanidine bonding in dinuclear transition metal complexes with bridging redox-active tetrakisguanidine ligands is analysed. A series of dinuclearcomplexes with different metals (Mn, Fe, Co, Ni,
The electronicstructures of dinuclear coppercomplexes of the general formula [GFA(CuX2)2], where X = Br or Cl and GFA denotes a redox-active bridging Guanidino-Functionalized Aromatic ligand, were analysed and compared. The diamagnetic complexes [GFA(CuBr2)2] can all be described as dinuclear CuI complexes with bridging GFA2+ dicationic ligand units exhibiting a [CuI–GFA2+–CuI] electronic structure
分析并比较了通式[GFA(CuX 2)2 ]的双核铜配合物的电子结构,其中X = Br或Cl,GFA表示氧化还原活性桥联胍基官能化芳族配体。抗磁复合物[GFA(CuBr 2)2 ]都可以描述为双核Cu I络合物,其具有显示[Cu I –GFA 2+ –Cu I ]电子结构的桥连GFA 2+决定性配体单元。电子结构以固态和所有适用的有机溶剂为主。[GFA(CuCl 2)2]复合体。它们在固态时是顺磁性的,在固态中被充分描述为具有中性桥接GFA配体单元([Cu II –GFA–Cu II ])的双核Cu II配合物。在溶液中,它们要么以[Cu II –GFA–Cu II ]形式存在,要么以价互变异构体形式[Cu I –GFA 2+ –Cu I]络合物,具体取决于溶剂的极性。仅在GFA = 2,3,5,6-四(四甲基胍基)吡啶和在丙酮作为溶剂的情况下,两个价互变异构体处于温度依赖性平衡。量子化学
Guanidine Electron Donors and Silver Halides: Interplay and Competition between Redox, Coordination and Polymerization Reactions
Redoxreactions compete with coordination and polymerization reactions when the organic electron donor and ligand, 1,2,4,5-tetrakis(tetramethylguanidino)benzene (1), is dissolved together with silver halides AgX (X = Cl, Br or I) in solvents of different polarity. The complex results obtained for the relatively simple system 1/AgX highlight the importance of solvent effects. A variety of chain polymers
for metal‐free σ‐bond activation, making use of oxidized, guanidino‐functionalized aromatic compounds (GFAs). We demonstrate this new option by the homocoupling reactions of thiols and phosphines. The kinetics and the reaction pathway were studied by a number of experiments (including heterocoupling of thiols and phosphines), supported by quantum‐chemical computations. Reaction of the oxidized GFA with