Exploiting the κ<sup>2</sup>‐Fashioned Coordination of [Se<sub>2</sub>]‐Donor Ligand L<sub>3</sub>Se for Facile Hg−C Bond Cleavage of Mercury Alkyls and Cytoprotection against Methylmercury‐Induced Toxicity
作者:Ramesh Karri、Ashish Chalana、Binayak Kumar、Sri Krishna Jayadev、Gouriprasanna Roy
DOI:10.1002/chem.201902578
日期:2019.10
coordinate through κ2 -fashion, in which both the Se atoms simultaneously attack the Hg center of mercury alkyls for facile Hg-C bond cleavage. It has the highest softness (σ) parameter and the lowest HOMO(Ln Se)-LUMO(MeHgX) energy gap and, thus, L3 Se is the most reactive among Ln Se towards MeHgX (X=Cl or I). L3 Se is highly efficient, more than L1 Se, in restoring the activity of antioxidant enzyme glutathione
Inhibition of Lactoperoxidase-Catalyzed Oxidation by Imidazole-Based Thiones and Selones: A Mechanistic Study
作者:Gouriprasanna Roy、P. N. Jayaram、Govindasamy Mugesh
DOI:10.1002/asia.201300274
日期:2013.8
N‐disubstituted thiones and selones that contain an imidazole pharmacophore. The N,N‐disubstituted thiones do not show any inhibitory activity towards LPO‐catalyzed oxidation reactions, but their corresponding N,N‐disubstituted selones exhibit inhibitory activity towards LPO‐catalyzed oxidation reactions. Substituents on the N atom of the imidazole ring appear to have a significant effect on the inhibition of LPO‐catalyzed
在本文中,我们描述了一系列包含咪唑药效基团的N,N-二取代的硫酮和色氨酸的合成和仿生活性。N,N-二取代的硫酮对LPO催化的氧化反应没有任何抑制活性,但它们相应的N,N-二取代的紫杉醇对LPO的氧化反应具有抑制作用。咪唑环N原子上的取代基似乎对LPO催化的氧化和碘化反应的抑制具有显著作用。Selones 16,17,和19,其中包含甲基,乙基,和苄基的取代基,表现出对与IC LPO催化氧化反应类似的抑制活性50个24.4,22.5,和22.5μ值中号,分别。但是,它们的活性几乎比常用的抗甲状腺药甲巯咪唑(MMI)低三倍。与此相反,selone 21,其中包含A N CH 2 CH 2 OH取代基,显示出高抑制活性,具有的IC 50值的7.2μ中号,这是类似于MMI的。这些selones对LPO催化的氧化/碘化反应的抑制活性是由于它们能够通过催化还原H 2 O 2来降低共底物(H 2 O
A Spectro- and Conductometric Study of the Reaction of Imidazoline-2-selone Derivatives with Bromine − Crystal Structure of 1,2-Bis(3-methyl-4-imidazolin-2-ylium dibromoselenanide)ethane
作者:Francesco Bigoli、Paola Deplano、Francesco A. Devillanova、Vito Lippolis、Maria Laura Mercuri、Maria Angela Pellinghelli、Emanuele F. Trogu
techniques. The experimental results clearly indicate that this reaction involves the dications 2a−c, containing an Se−Se bond, as intermediates in the formation of the hypervalent 10-Se-3 selenium compounds 3a−c containing the Br−Se−Br group. The crystal structure of 1,2-bis(3-methyl-4-imidazolin-2-ylium dibromoselenanide)ethane (3c), a new stable hypervalent 10-Se-3 compound, is also reported.
Dinuclear copper(<scp>i</scp>) complexes with N-heterocyclic thione and selone ligands: synthesis, characterization, and electrochemical studies
作者:Martin M. Kimani、David Watts、Leigh A. Graham、Daniel Rabinovich、Glenn P. A. Yap、Julia L. Brumaghim
DOI:10.1039/c5dt02232k
日期:——
The synthesis, characterization, and structures of a series of homoleptic and heteroleptic copper(I) complexes supported by N-heterocyclic chalcogenone ligands is reported herein. The quasi-reversible Cu(II/I) reduction potentials of these copper complexes with monodentate (dmit or dmise) and/or bidentate (BmmMe, BsemMe, BmeMe, BseeMe) chalcogenone ligands are highly dependent upon the nature and number
Role of C, S, Se and P donor ligands in copper(<scp>i</scp>) mediated C–N and C–Si bond formation reactions
作者:Katam Srinivas、Ganesan Prabusankar
DOI:10.1039/c8ra06057f
日期:——
ligands-supported copper(I) complexes for C–N and C–Si bond formation reactions are described. The syntheses and characterization of eight mononuclear copper(I) chalcogenone complexes, two polynuclear copper(I) chalcogenone complexes and one tetranuclear copper(I) phosphine complex are reported. All these new complexes were characterized by CHN analysis, FT-IR, UV-vis, multinuclear NMR and single crystal X-ray
描述了 C、S、Se 和 P 供体配体负载的铜 ( I ) 配合物用于 C-N 和 C-Si 键形成反应的首次比较研究。报道了8个单核铜( I )硫族酮配合物、2个多核铜( I )硫族酮配合物和1个四核铜( I )膦配合物的合成和表征。通过 CHN 分析、FT-IR、UV-vis、多核 NMR 和单晶 X 射线衍射技术对所有这些新配合物进行了表征。这些配合物的单晶 X 射线结构描绘了铜存在广泛的配位环境(I) 中央。这是金属-膦、金属-NHC和金属-咪唑啉-2-硫属元素酮在C-N和C-Si键形成反应中的首次比较研究。在所有催化剂中,单核铜( I )硫酮、单核铜( I )N-杂环卡宾和四核铜( I )膦对1,2,3-三唑的合成和交叉脱氢反应非常活跃炔烃与硅烷的偶联。末端炔烃与硅烷的交叉脱氢偶联代表了由金属-咪唑啉-2-硫属元素酮介导的催化过程的首次报道。