Gharehkhani Alireza, Ghorbani-Vaghei Ramin, Alavinia Sedigheh
Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University Zip Code 65174 Hamedan Iran
RSC Adv. 2021 Nov 22;11(59):37514-37527. doi: 10.1039/d1ra07393a. eCollection 2021 Nov 17.
The purpose of this work is to develop a magnetically recyclable immobilized base catalyst for the green synthesis of calixresorcarenes. To achieve this, poly triazine-benzene sulfonamide (PTBSA) has been coated on magnetic FeO nanoparticles and subsequently chlorosulfonic acid has been supported to obtain FeO@PTBSA-SOH. The structure of nano-FeO@PTBSA-SOH was characterized by TEM, XRD, FT-IR, VSM, WDX, EDX, TGA/DSC and FE-SEM. The catalytic efficiency of this catalyst was also investigated in the synthesis of novel calixresorcarene derivatives. The advantages of heterogeneous nature, catalytic activity and the recyclability of the polymer support were also strengthened by advanced surface treatment. These key factors (basic sites, acidic sites and heterogeneity) play essential roles in the catalyst performance. This procedure has some advantages such as short reaction time, clean and fast work-up and easy separation of the catalyst by an external magnet.
这项工作的目的是开发一种用于杯芳烃绿色合成的磁性可回收固定化碱催化剂。为此，聚三嗪 - 苯磺酰胺（PTBSA）已被包覆在磁性FeO纳米颗粒上，随后负载氯磺酸以获得FeO@PTBSA - SOH。通过透射电子显微镜（TEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FT - IR）、振动样品磁强计（VSM）、波长色散X射线光谱仪（WDX）、能量散射X射线光谱仪（EDX）、热重/差示扫描量热仪（TGA/DSC）和场发射扫描电子显微镜（FE - SEM）对纳米FeO@PTBSA - SOH的结构进行了表征。还研究了该催化剂在新型杯芳烃衍生物合成中的催化效率。聚合物载体的多相性质、催化活性和可回收性等优点也通过先进的表面处理得到了强化。这些关键因素（碱性位点、酸性位点和多相性）在催化剂性能中起着至关重要的作用。该方法具有一些优点，如反应时间短、后处理干净快速以及通过外部磁铁易于分离催化剂。
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