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
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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.
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.
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