制备在碳酸酯键的一侧上包含碘化芳族环且在另一侧上包含烷基的碳酸盐。芳族侧由对碘苯基,对碘苄基,间碘苄基,3,5-二碘苄基,间氨基-2,4,6-三碘苄基,间乙酰氨基-2,4,6-三碘苄基,对碘苯乙基组成,对-碘-仲-苯乙基,3-(对-碘苯基)丙基,3-(对碘苯基)丁基,2-(对碘苄基)丁基和2-(碘苄基)己基。碳酸盐的烷基部分衍生自含有两个至十个碳原子的烷基醇。腹膜内注射的致死剂量范围从小于1 ml / kg到大于15 ml / kg。目前正在研究将这些化合物用作不透射线的脊髓造影,淋巴造影,支气管造影和输卵管造影。
A cyclometalated Ir(<scp>iii</scp>)–NHC complex as a recyclable catalyst for acceptorless dehydrogenation of alcohols to carboxylic acids
作者:Dhrubajit Borah、Biswajit Saha、Bipul Sarma、Pankaj Das
DOI:10.1039/d0dt02341h
日期:——
two new [C, C] cyclometalated Ir(III)–NHC complexes, [IrCp*(C∧C:NHC)Br](1a,b), [Cp* = pentamethylcyclopentadienyl; NHC = (2-flurobenzyl)-1-(4-methoxyphenyl)-1H-imidazoline-2-ylidene (a); (2-flurobenzyl)-1-(4-formylphenyl)-1H-imidazoline-2-ylidene (b)] via intramolecular C–H bond activation. The molecular structure of complex 1a was determined by X-ray single crystal analysis. The catalytic potentials
Iridium Catalysts for Acceptorless Dehydrogenation of Alcohols to Carboxylic Acids: Scope and Mechanism
作者:Valeriy Cherepakhin、Travis J. Williams
DOI:10.1021/acscatal.8b00105
日期:2018.5.4
η3-C8H12)(2-PyCH2PtBu2)] (2a) and [Ir2H3(CO)(2-PyCH2PtBu2)μ-(C5H3N)CH2PtBu2}] (2c). The unexpected similarities in reactivities of 1 and 2 in this reaction, along with synthetic studies on several of our iridium intermediates, enable us to form a general proposal of the mechanisms of catalyst activation that govern the disparate reactivities of 1 and 2, respectively, in glycerol and formic acid dehydrogenation
我们介绍了在氢氧化钾和[Ir(2-PyCH 2(C 4 H 5 N 2))(COD)] OTf(1)或[Ir(2-PyCH 2 PBu 2 t)(COD)] OTf(2)。该方法以高收率和优异的官能团耐受性提供脂族和苄基羧酸盐。我们举例说明了该方法在各种伯醇中的应用,包括涉及杂环甚至是游离胺的伯醇。复杂2与醇反应以形成晶体学表征催化中间体[IRH(η 1,η 3 -C 8 ħ 12)(2-PyCH 2 P吨卜2)](2A)和物[Ir 2 ħ 3(CO)(2- PyCH 2 P t Bu 2)μ-(C 5 H 3 N)CH 2 P t Bu 2 }](2c)。反应性1和2的意外相似之处在此反应中,以及对几种铱中间体的合成研究,使我们能够形成催化剂活化机理的一般建议,该催化剂分别控制甘油和甲酸脱氢反应中1和2的不同反应性。此外,仔细分析氧化顺序中的有机中间体,可以使人们对蒂申科和坎尼扎罗反应在整个氧化反应中的作用有了新的认识。
The Hydroxide-Promoted Catalytic Hydrodefluorination of Fluorocarbons by Ruthenium in Aqueous Media
作者:Michael M. Konnick、Steven M. Bischof、Roy A. Periana、Brian G. Hashiguchi
DOI:10.1002/adsc.201200870
日期:2013.3.11
6‐imidizoylpyridine (IPI) in aqueous potassium hydroxide media is shown to be a suitable catalyst for the CF bond activation and subsequent hydrodefluorination (and hydrogenolysis) of a model fluorocarbon. Furthermore, the conversion of CF bonds was enhanced upon increasing the concentration of potassium hydroxide [KOH]. A simple, non‐ligated heterogeneous analogue derivedfrom ruthenium(III) trichloride trihydrate
Synthesis of potassium ferrite by precursor and combustion methods
作者:B. S. Randhawa、H. S. Dosanjh、N. Kumar
DOI:10.1007/s10973-008-8920-7
日期:2009.1
The thermolysis of potassium hexa(carboxylato)ferrate(III) precursors, K3[Fe(L)6]·xH2O (L=formate, acetate, propionate, butyrate), has been carried out in flowing air atmosphere from ambient temperature to 900°C. Various physico-chemical techniques i.e. TG, DTG, DTA, XRD, IR, Mössbauer spectroscopy etc. have been employed to characterize the intermediates and end products. After dehydration, the anhydrous complexes undergo exothermic decomposition to yield various intermediates i.e. potassium carbonate/acetate/propionate/butyrate and α-Fe2O3. A subsequent decomposition of these intermediates leads to the formation of potassium ferrite (KFeO2) above 700°C. The same ferrite has also been prepared by the combustion method at a comparatively lower temperature (600°C) and in less time than that of conventional ceramic method.