Beryllium Halide Complexes Incorporating Neutral or Anionic Ligands: Potential Precursors for Beryllium Chemistry
作者:Albert Paparo、Cameron Jones
DOI:10.1002/asia.201801800
日期:2019.2
[BeX2(OEt2)2] (X=Br or I) with N,N,N′,N′‐tetramethylethylenediamine (TMEDA), a series of diazabutadienes, or bis(diphenylphosphino)methylene (DPPM) have yielded the chelated complexes, [BeX2(TMEDA)], [BeX2(RN=CH)2}] (R=tBu, mesityl (Mes), 2,6‐diethylphenyl (Dep) or 2,6‐diisopropylphenyl (Dip)), and the non‐chelated system, [BeI2(κ1‐P‐DPPM)2]. Reactions of lithium or potassium salts of a variety of β‐diketiminates
二卤化铍络合物[BeX 2(OEt 2)2 ](X = Br或I)与N,N,N',N'-四甲基乙二胺(TMEDA),一系列二氮杂丁二烯或双(二苯基膦基)亚甲基( DPPM)产生了螯合的复合物[BeX 2(TMEDA)],[BeX 2 (RN = CH)2 }](R = t Bu,异丁烯基(Mes),2,6-二乙苯基(Dep)或2, 2,6-二异丙基(DIP)),和非螯合的系统,[BEI 2(κ 1 - P -DPPM)2]。各种β-二酮化合物的锂盐或钾盐的反应均给出了三配位络合物[HC(RCNAr)2 } BeX](R = H或Me; Ar = Mes,Dep或Dip; X = Br或一世); 以及四坐标系[HC(MeCNPh)2 } BeBr(OEt 2)]和[HC(MeCNDip)(MeCNC 2 H 4 NMe 2 } BeI]。 ,或三联苯配体,生成二聚体[BeI μ-[(OCMe)(DipNCMe)]
High-Throughput Screening of Metal-<i>N</i>-Heterocyclic Carbene Complexes against Biofilm Formation by Pathogenic Bacteria
作者:Thierry Bernardi、Stéphanie Badel、Pascal Mayer、Jérome Groelly、Pierre de Frémont、Béatrice Jacques、Pierre Braunstein、Marie-Laure Teyssot、Christelle Gaulier、Federico Cisnetti、Arnaud Gautier、Sylvain Roland
DOI:10.1002/cmdc.201402012
日期:2014.6
A set of molecules including a majority of metal‐N‐heterocyclic carbene (NHC) complexes (metal=Ag, Cu, and Au) and azolium salts were evaluated by high‐throughput screening of their activity againstbiofilmformation associated with pathogenicbacteria. The anti‐planktonic effects were compared in parallel. Representative biofilm‐forming strains of various genera were selected (Listeria, Pseudomonas
通过高通量筛选它们对与病原菌相关的生物膜形成的活性,评估了包括大多数金属-N-杂环卡宾(NHC)配合物(金属= Ag,Cu和Au)和盐的一组分子。并行比较了抗浮游生物的作用。选择了不同属的代表性生物膜形成菌株(李斯特菌,假单胞菌,葡萄球菌和大肠埃希氏菌)。所有化合物均以1 mg L -1进行测试通过使用BioFilm环形测试。根据标准化实验值确定信息得分(IS,活性总和)和活性得分(AS,抗生物膜和抗浮游生物活性之间的差异),以根据细菌菌株对活性最高的分子进行分类。通过这种方法,我们确定了在NHC配体上具有芳族基团的亲脂性Ag I和Cu I络合物是抑制生物膜形成的最有效方法。
Allowing the direct interaction of N-aryl α-diimines with a high valent metal chloride: one-pot WCl<sub>6</sub>-promoted formation of quinoxalinium salts
The full potential of a high valent metalchloride as both a chlorinating and an oxidative agent was explored by allowing WCl6 to react with N-(2,6-diisopropylphenyl) α-diimines, in CH2Cl2 at room temperature. These α-diimines underwent unprecedented conversion to quinoxalinium cations via intramolecular C–N coupling.
The direct interactions of WCl6and MoCl5with α-diimines (and also a carbodiimide in the case of MoCl5) have been explored, leading to unusual reaction pathways.
Differing Reactivities of Cp*Ga toward Diazabutadienes: Synthesis of Novel 1-Galla-2,5-diazoles and of the Known Radical Ga[Bu<sup>t</sup>-DAB]<sub>2</sub>
The heterocycles [([eta (1)-Cp*)GaN(Dipp)CH=CHN(Dipp)] (1) and [(eta (1)-Cp*)GaN(Dep)CH= CHN(Dep)] (2) were obtained by oxidative addition of (eta (5)-pentamethylcyclopentadienyl)gallium(I) (Cp*Ga) to Dipp-DAB (1,4-bis(2,6-diisopropylphenyl)-1,4-diazabuta-1,3-diene) and Dep-DAB (1,4-bis(2,6-diethylphenyl)-1,6diazabuta-1,3-diene), respectively. Compounds 1 and 2 are the first examples of monomeric gallium-containing heterocycles of the diazabutadiene (DAB) type. 1 was structurally characterized by X-ray crystallography. In contrast, the reaction of Cp*Ga with But-DAB (1,4-di-tert-butyl-1,4-diazabuta-1,3-diene) led to the formation of the known radical (Ga[Bu-t-DAB](2)) (3) in high yield, thus providing an alternative synthesis to the cocondensation technique used previously. Radical 3 was further characterized by H-1 NMR spectroscopy and cyclic voltammetric studies, which revealed two reversible oxidation steps and one reversible reduction step.