Nano-zirconia as an excellent nano support for immobilization of sulfonic acid: a new, efficient and highly recyclable heterogeneous solid acid nanocatalyst for multicomponent reactions
作者:Ali Amoozadeh、Salman Rahmani、Mehrnoosh Bitaraf、Fatemeh Bolghan Abadi、Elham Tabrizian
DOI:10.1039/c5nj02430g
日期:——
Nano-zirconia-supported sulfonic acid as a novel, highly efficient and recyclable heterogeneous nanocatalyst is reported for the synthesis of multicomponent reactions.
报告了一种新型的、高效的、可回收的纳米催化剂——纳米氧化锆支撑的磺酸,用于合成多组分反应。
Synthesis, characterization and heterogeneous catalytic application of a nickel(II) Schiff base complex immobilized on MWCNTs for the Hantzsch four-component condensation
作者:Jamshid Rakhtshah、Sadegh Salehzadeh、Mohammad Ali Zolfigol、Saeed Baghery
DOI:10.1080/00958972.2016.1253068
日期:2017.1.17
highly efficient heterogeneous catalyst was synthesized and characterized by IR, X-ray diffraction patterns, scanning electron microscopy, energy-dispersive X-ray spectroscopy, inductively coupled plasma, elemental analysis, and thermal gravimetric analysis. Then a facile and environmentally benign procedure was developed for synthesis of polyhydroquinoline derivatives via Hantzschone-pot condensation
摘要 合成了一种固定在多壁碳纳米管 (MWCNTs) 表面的镍 (II) Schiff 碱配合物作为一种高效的多相催化剂,并通过 IR、X 射线衍射图、扫描电子显微镜、能量色散 X 射线光谱进行表征。 、电感耦合等离子体、元素分析和热重分析。然后,在上述合成催化剂的存在下,在无溶剂条件下,通过芳香醛、1,3-二酮、乙酰乙酸乙酯和乙酸铵的 Hantzsch 一锅缩合反应,开发了一种简便且环境友好的方法合成聚氢喹啉衍生物。该方案具有催化剂稳定性、易得性、可回收性和环保性,实验和后处理程序简单等优点,并且产量也很高。考虑到模型反应的无溶剂条件以及温度、时间和产率,这里报道的纳米催化剂是迄今为止报道的用于合成聚氢喹啉的最佳催化剂之一。
Poly(vinylpyrrolidinium) perchlorate as a new and efficient catalyst for the promotion of the synthesis of polyhydroquinoline derivatives via Hantzsch condensation
poly(vinylpyrrolidinium) perchlorate [PVPH]ClO4} as a new modified polymeric catalyst in the absence of solvent is reported. The title catalyst is easily prepared and characterized using a variety of techniques including infrared spectra, X-ray diffraction, thermal gravimetric analysis, scanning electron microscopy, pH analysis, and Hammett acidity function. Some of the advantages of this novel synthetic method are:
An efficient synthesis of various substituted Hantzsch-1,4-dihydropyridines and hexahydroquinolines, using a molybdenum(VI) complex as homogenous catalyst, from aldehydes, β-keto esters or cyclohexadiones and ammonium acetate in molten tetrabutyl ammonium bromide as an ionic liquid is described. This novel method consistently gave excellent yields (70–92%) and short reaction times (7–30 min).
Morpholine stabilized on nano silica sulfuric acid: a novel reusable catalyst for the synthesis of triazoloquinazoline and polyhydroquinoline derivatives
the prepared reagent was investigated in the promotion of the synthesis of triazoloquinazoline derivatives. This reagent was also efficiently able to catalyze the synthesis of a variety of polyhydroquinoline derivatives. In both of the studied reactions, the procedure lead to the products with excellent yields during very short reaction times. Also, the catalyst was reused several times without considerable
在本研究中,吗啉在纳米二氧化硅硫酸上的稳定作用产生了一种新型的固体酸性试剂,使用傅里叶变换红外光谱 (FT-IR)、X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、热重技术和能量色散 X 射线 (EDX)。接着,研究了所制备试剂在促进三唑并喹唑啉衍生物合成中的催化能力。该试剂还能够有效地催化多种聚氢喹啉衍生物的合成。在所研究的两个反应中,该程序在非常短的反应时间内产生具有优异产率的产物。此外,催化剂多次重复使用,其效率没有明显损失。