Solvent-free preparation of arylaminotetrazole derivatives using aluminum(III) hydrogensulfate as an effective catalyst
作者:Ferydoon Khamooshi、Ali Reza Modarresi-Alam
DOI:10.1016/j.cclet.2010.03.008
日期:2010.8
Abstract An efficient and simple method for the preparation of 5-arylamino-1H-tetrazole and 1-aryl-5-amino-1H-tetrazole derivatives is reported using aluminum(III) hydrogensulfate (Al(HSO4)3) as an effective heterogeneous catalyst from secondary arylcyanamides. Generally, when the substitution in arylcyanamide is strongly electron-withdrawing the position of equilibrium would shift toward the isomer
Biosynthesis and characterization of magnetic starch-silver nanocomposite: catalytic activity in eco-friendly media
作者:Atefeh Nasiri、Mohammad A. Khalilzadeh、Daryoush Zareyee
DOI:10.1080/00958972.2022.2038369
日期:2022.1.17
using AgNPs@Fe3O4-nanostarch as a magnetically separable and reusable catalyst. The catalyst showed high catalytic performance in the reduction of 4-NP, CR, RhB and MB using NaBH4 as the source of hydrogen in an aqueous medium. The products were formed in good yields through a simple method and facile work-up. In addition, the catalyst could easily be separated from the reaction mixture using an external
摘要 AgNPs@Fe 3 O 4 -nanostarch 纳米复合材料是使用Helicteres isora L. 提取物作为还原剂和稳定剂制备的。FESEM、EDS、TEM、FT-IR、XRD、VSM 和元素映射用于表征合成的纳米复合材料。该纳米复合材料被用作磁性可分离和可重复使用的催化剂,通过不同的芳基氰酰胺与叠氮化钠以高收率反应制备各种芳基氨基四唑,而不会形成叠氮酸。我们报告了使用 AgNPs@Fe 3 O 4在无溶剂条件下通过过氧化氢以高收率将苯甲醇氧化为苯甲醛-纳米淀粉作为可磁分离和可重复使用的催化剂。该催化剂在使用NaBH 4作为水性介质中的氢源还原4-NP、CR、RhB和MB方面表现出较高的催化性能。通过简单的方法和容易的后处理,产物以良好的收率形成。此外,催化剂可以很容易地使用外部磁铁从反应混合物中分离出来,并且可以重复使用至少 5 次,而催化活性没有明显损失。
Synthesis of arylaminotetrazoles by ZnCl2/AlCl3/silica as an efficient heterogeneous catalyst
作者:Davood Habibi、Mahmoud Nasrollahzadeh
DOI:10.1007/s00706-011-0670-8
日期:2012.6
Arylaminotetrazoles were efficiently synthesized from secondary arylcyanamides by application of ZnCl2/AlCl3/silica as a reusable heterogeneous Lewis acid catalyst. 5-Arylamino-1-tetrazoles can be obtained from arylcyanamides carrying electron-withdrawing substituents on the aryl ring, while with electron-releasing groups 1-aryl-5-amino-1-tetrazoles will be produced. The former isomer is also produced within longer reaction times (similar to 20 h) even with electron-releasing groups.
Silica-Supported Ferric Chloride (FeCl<sub>3</sub>-SiO<sub>2</sub>): An Efficient and Recyclable Heterogeneous Catalyst for the Preparation of Arylaminotetrazoles
作者:Davood Habibi、Mahmoud Nasrollahzadeh
DOI:10.1080/00397910903370683
日期:2010.9.30
An efficient method for preparation of 5-arylamino-1H-tetrazole and 1-aryl-5-amino-1H-tetrazole derivatives is reported using FeCl3-SiO2 as an effective heterogeneous catalyst. Generally, when the substituent in arylcyanamide is a strongly electron-withdrawing group, the position of the equilibrium would shift toward 5-arylamino-1H-tetrazole, whereas with an electron-releasing substituent, the position of the equilibrium would shift toward 1-aryl-5-amino-1H-tetrazole.
Magnetic chitosan-copper nanocomposite: A plant assembled catalyst for the synthesis of amino- and N-sulfonyl tetrazoles in eco-friendly media
作者:Narjes Motahharifar、Mahmoud Nasrollahzadeh、Asghar Taheri-Kafrani、Rajender S. Varma、Mohammadreza Shokouhimehr
DOI:10.1016/j.carbpol.2019.115819
日期:2020.3
A greener, cost efficient and simple method is described to prepare coppernanoparticles (NPs) immobilized on the magnetic chitosan (one of the more versatile polysaccharides) using Euphorbia falcata leaf extract as reducing/stabilizing agent. The prepared catalyst (Cu NPs@Fe3O4-chitosan) was authenticated by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), transmission