5′-(alkane-2,2-diyl)bis(1H-pyrrole-2-carbaldehydes). These macrocycles, differing for the alkyl/aryl meso-substituents, were used as ligands in the copper-catalyzed Henry reactions of aromatic and aliphatic aldehydes with nitroalkanes. In the optimized experimental conditions, the condensations of nitromethane and aromatic and aliphatic aldehydes in the presence of catalytic amounts of copper diacetate and
ionic liquid gel has been prepared by entrapping 1-butyl-3-methylimidazolium hydroxide ([Bmim]OH) in an aqueous agar gel. The ionic liquid gel has been characterized by Fourier transform infrared (FT-IR), Fourier transform Raman (FT-Raman) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and energy dispersive X-ray analysis (EDX). The ionic liquid gel has been successfully
Synthesis, spectral characterization and crystal structure of Ni(II) pyridoxal thiosemicarbazone complexes and their recyclable catalytic application in the nitroaldol (Henry) reaction in ionic liquid media
The molecular structure of the complex [Ni(L2)PPh3] (2) was determined by single-crystal X-ray diffraction, which reveals a distorted square planar geometry around the nickel(II) ion. The nitroaldol reaction was studied in detail using the nickel(II) complexes as catalysts in a homogeneous solution formed by an ionic liquid and methanol. The effect of solvent, ionic liquid, time, temperature, catalyst
the N2Cl3 coordination sphere around copper(II) is distorted square pyramidal in nature in 2-OCH3. Isolated 2-R complexes, on dissolution in methanol, are found to undergo facile reduction of the metal center to generate the corresponding 1-R complexes. The 1-R and 2-R complexes show intense absorptions in the visible and ultraviolet regions. Cyclic voltammetry on the 1-R and 2-R complexes shows both
摘要1,4-二氮杂丁二烯(p-RC6H4N = C(H)(H)C = NC6H4R-p; R = OCH3,CH3,H和Cl;缩写为LR)在环境温度下于甲醇中与CuCl2·2H2O反应25°C)提供一组[CuI(LR)Cl} 2]类型的双氯桥联双铜配合物,命名为1-R。在乙腈中进行的类似反应提供了一种类型为[CuII(LR)Cl2} 2]的双氯桥联双铜络合物,称为2-R。1-OCH3和2-OCH3的分子结构已经通过X射线晶体学确定。虽然铜(I)在1-OCH3中具有接近四面体的N2Cl2配位球,但铜(II)周围的N2Cl3配位球在2-OCH3中实际上是扭曲的方形锥体。分离的2-R配合物,溶于甲醇后,被发现容易地还原金属中心以生成相应的1-R配合物。1-R和2-R配合物在可见光和紫外线区域显示出强烈的吸收。1-R和2-R配合物的循环伏安法显示了以金属为中心和以配体为中心的氧化还原反应。发现
One-pot synthesis of nitroalkenes via the Henry reaction over amino-functionalized MIL-101 catalysts
MIL-101 to prepare the amino-functionalized MIL-101 materials, which were used as heterogeneous catalysts in the one-pot synthesis of nitroalkenes via the Henry reaction. Various reaction conditions were optimized. Under the optimized conditions, the selectivity towards nitroalkenes is extremely high in combination with nearly complete conversion of the reactant nitroalkanes. The amino-functionalized