Aerobic Oxidation of Diverse Primary Alcohols to Methyl Esters with a Readily Accessible Heterogeneous Pd/Bi/Te Catalyst
摘要:
Efficient aerobic oxidative methyl esterification of primary alcohols has been achieved with a heterogeneous catalyst consisting of 1 mol % Pd/charcoal (5 wt %) in combination with bismuth(III) nitrate and tellurium metal. The Bi and Te additives significantly increase the reaction rate, selectivity, and overall product yields. This readily accessible catalyst system exhibits a broad substrate scope and Is effective with both activated (benzylic) and unactivated (aliphatic) alcohols bearing diverse functional groups.
The aim of this work is experimental study of an interesting bismuth(III) complex derived from pentadentate 2,6-pyridinedicarboxaldehyde bis(4N-methylthiosemicarbazone), [BiL(NO3)2]NO3 L = 2,6-pyridinedicarboxaldehyde bis(4N-methylthiosemicarbazone)}. A series of in vitro biological studies indicate that the newly prepared [BiL(NO3)2]NO3 greatly suppressed colony formation, migration and significantly
这项工作的目的是实验研究有趣的从五齿的2,6-吡啶二甲醛甲醛双(4 N-甲基硫代半脲),[BiL(NO 3)2 ] NO 3 L = 2,6-吡啶二甲醛bis(4 N-甲基硫代半碳酮)}。一系列的体外生物学研究表明,新制备的[BiL(NO 3)2 ] NO 3大大抑制了人类肺癌细胞A549和H460的集落形成,迁移并明显诱导了其凋亡,但并未明显降低非癌性人类肺成纤维细胞(HLF)细胞系的细胞活力,显示出比其母体配体更高的抗癌活性,特别是最大抑制浓度(IC 50)的一半<3.5μM。此外,体内研究提供了足够的证据表明[BiL(NO 3)2 ] NO 3的治疗有效抑制了荷瘤小鼠(10 mg kg − 1,与对照组相比,肿瘤体积减少了97.92%,肿瘤重量减少了94.44%,并且没有显示出对小鼠体重和肝脏的有害影响。这些结果表明,游离配体与Bi(III)的配位可能是发现新的抗癌药物候选者的有趣且有效的策略。
Structural insights into the polymorphism of bismuth(III) di-n-butyldithiocarbamate by X-ray diffraction, solid-state (13C/15N) CP-MAS NMR and DFT calculations
作者:Vasantha Gowda、Bipul Sarma、Risto S. Laitinen、Anna-Carin Larsson、Alexander V. Ivanov、Dinu Iuga、Perttu Lantto、Oleg N. Antzutkin
DOI:10.1016/j.poly.2017.03.018
日期:2017.6
polymorphs of a binuclear tris(di-n-butyldithiocarbamato)bismuth(III) complex, I and II, with an empirical formula of [BiS2CN(n-C4H9)2}3] were synthesised and characterised by X-ray diffraction (XRD), solid-state NMR and density functional theory (DFT) calculations. At the supramolecular level, these mononuclear molecular units interact in pairs via secondary Bi⋯S bonds, yielding binuclear formations of
Photocatalytic aerobic oxidation of amines to imines on BiVO<sub>4</sub> under visible light irradiation
作者:Bo Yuan、Ruifeng Chong、Bao Zhang、Jun Li、Yan Liu、Can Li
DOI:10.1039/c4cc07097f
日期:——
BiVO4 was found to be an efficient photocatalystundervisiblelight irradiation for selectiveoxidation of amines to imines with high activity (99% conversion) and selectivity (up to 99%) using oxygen as an oxidant.
Perovskite-type ferromagnetic BiFeO3 nanopowder: a new magnetically recoverable heterogeneous nanocatalyst for efficient and selective transfer hydrogenation of aromatic nitro compounds into aromatic amines under microwave heating
作者:S. Farhadi、N. Rashidi
DOI:10.1007/s13738-012-0149-5
日期:2012.12
Perovskite-type ferromagnetic BiFeO3 nanopowder was readily synthesized via thermal decomposition of Bi[Fe(CN)6]·5H2O complex and characterized using thermal analysis (TGA/DSC), X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FT–IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), magnetic measurement and Brunauer–Emmett–Teller (BET) specific surface area measurements. The magnetic measurements show a ferromagnetic behavior for the BiFeO3 nanoparticles at room temperature. This nanosized ferromagnetic oxide with an average particle size of approximately 20 nm and a specific surface area of 48.5 m2/g was used as a new magnetically recoverable heterogeneous nanocatalyst for the highly efficient and selective reduction of aromatic nitro compounds into their corresponding amines by using propan-2-ol as the hydrogen donor under microwave irradiation. This method is regio- and chemoselective, clean, inexpensive and compatible with the substrates having hydrogenlyzable or reducible functional groups. As compared with conventional heating, this method is very fast and suitable for the large-scale preparation of different substituted anilines as well as other arylamines. The catalyst can also be reused without loss of activity.
Synthesis of g-Bi2MoO6 by Co-precipitation Method and Evaluation for Photocatalytic Degradation of Rhodamine B, Crystal Violet and Orange II Dyes Under Visible Light Irradiation
g-Bismuth molybdate (g-Bi2MoO6) catalyst has been successfully synthesized by co-precipitation method and followed by calcination using stoichiometry ratio of bismuth nitrate, nitric acid, ammonium molybdate as precursor materials. The synthesized g-Bi2MoO6 nanoparticles characterized by X-ray diffraction for identifying crystalline phases and particle size, Raman spectroscopy identifies active species during the reaction, Fourier transform infrared spectroscopy is to identify adsorbed species and to study the way in which these species are chemisorbed at the surface of the catalyst, UV-visible diffuse reflectance spectroscopy (UV-DRS) revealed for band energy of semiconductors, Field emission scanning electron microscopy (FE-SEM) is to determine morphology and shape of supported particles and Energy dispersive X-ray analysis (EDX) is for elemental analysis of synthesized nanoparticles. The photocatalytic activity of g−Bi2MoO6 catalyst evaluated using the degradation of Rhodamine-B, Crystal Violet and Orange II dyes under visible light irradiation at room temperature.