Design of a new unsymmetrical bis (imino) pyridine Schiff-base co-complex with an ionic liquid group as a recyclable green catalyst to prepare chromenes derivatives from benzylic alcohol

IF 1.6 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Transition Metal Chemistry Pub Date : 2023-07-19 DOI:10.1007/s11243-023-00541-y

Reza Mohammadian, Reza Sandaroos, Ali Allahresani

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引用次数: 1

Abstract

The preparation and characterization of a new unsymmetrical ligand on Fe₃O₄@SiO₂ with its cobalt complex including an ionic liquid (ILs) group by ¹H-NMR, ¹³C-NMR, FTIR, SEM, EDX, TGA, XRD, and VSM. The catalyst was used in the reaction to prepare chromene compounds from alcohol. Catalyst amount, temperature, solvent, and solvent amount were investigated as factors affecting the reaction. For the synthesis of chromene derivatives at optimum conditions, the alcohol derivatives were first oxidized by the catalyst, followed by malononitrile and diketone additions to the reaction vessel. Recovery and reusability of the catalyst were investigated, which showed excellent results. The presence of ionic liquid groups increased the solubility of the heterogeneous catalyst in green solvents, which increased the efficiency and reduced the reaction time.

Graphical abstract

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一种新型离子液体基非对称双(亚胺)吡啶希夫碱配合物的设计，作为可回收的绿色催化剂，用于苯甲醇制备铬衍生物

通过1H-NMR、13C-NMR、FTIR、SEM、EDX、TGA、XRD、VSM等手段，在Fe3O4@SiO2上制备了含离子液体(ILs)基钴配合物的新型不对称配体。该催化剂用于醇制铬化合物的反应。考察了催化剂用量、温度、溶剂用量和溶剂用量对反应的影响。为了在最佳条件下合成铬衍生物，首先将醇衍生物由催化剂氧化，然后在反应容器中加入丙二腈和二酮。对催化剂的回收和再利用进行了研究，取得了良好的效果。离子液体基团的存在提高了多相催化剂在绿色溶剂中的溶解度，提高了反应效率，缩短了反应时间。图形抽象

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来源期刊

Transition Metal Chemistry 化学-无机化学与核化学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

1.3 months

期刊介绍： Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc. Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.