In this the study a novel, efficient and recoverable heterogeneous nanocatalyst with regards to green chemistry purpose was approached. The structure of the newly synthesized heterogeneous magnetic nanocatalyst with enhanced and improved catalytic efficiency were determined by various instrumental techniques, including SEM, VSM, TGA, XRD, UV–VIS FT-IR and EDXA. The results, showed that the synthesized nanoparticles are superparamagnetic with a size range of 10–20 nm. Then the catalytic activity and efficient performance of Fe3O4@PABA-Cu(II) MNPs were analyzed toward the synthesis of novel 5-arylidenthiazolidine-2,4-diones and 5-arylidene-2-imidazolidine-2,4-dione derivatives via aldol condensation reactions between a variety of (hetero) aromatic aldehydes and hydantoin or thiazolidine-2,4-dione multifunctional privileged scaffolds under reflux condensations in ethanol as a benign solvent. Nontoxic nature and environment-friendly properties of the catalyst, simple workup, short time of reaction, easy separation of the catalyst from products, efficiency, and excellent yields are beneficial aspects of this method. It is the first report of aldol synthesis of new 5-arylidenthiazolidine-2,4-dione, and 5-arylidene-imidazolidine-2,4-dione derivatives using a reusable copper-PABA complex supported on Fe3O4 MNPs (Fe3O4@PABA-Cu(II)) catalyst in Green media.

中文翻译：

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一种新型磁性固定对氨基苯甲酸-Cu(II) 配合物：一种绿色、高效且可重复使用的绿色介质中羟醛缩合反应的催化剂

在这项研究中，研究了一种新型、高效且可回收的多相纳米催化剂，用于绿色化学目的。通过各种仪器技术，包括 SEM、VSM、TGA、XRD、UV-VIS FT-IR 和 EDXA，确定了新合成的具有增强和改进催化效率的多相磁性纳米催化剂的结构。结果表明，合成的纳米颗粒是超顺磁性的，尺寸范围为 10-20 nm。然后分析了 Fe3O4@PABA-Cu(II) MNPs 对通过羟醛合成新型 5-芳基异噻唑烷-2,4-二酮和 5-亚芳基-2-咪唑烷-2,4-二酮衍生物的催化活性和高效性能各种（杂）芳香醛与乙内酰脲或噻唑烷-2之间的缩合反应，在作为良性溶剂的乙醇中回流缩合下的 4-二酮多功能特权支架。该催化剂无毒、环保、后处理简单、反应时间短、催化剂与产物易分离、效率高、收率高是该方法的优点。这是使用可重复使用的铜-PABA 复合物在 Fe3O4 MNP 上（Fe3O4@PABA-Cu）合成新的 5-芳基异噻唑烷-2,4-二酮和 5-亚芳基-咪唑烷-2,4-二酮衍生物的首次报道(II)) 绿色介质中的催化剂。