IMPREGNATED COPPER ON MAGNETICALLY RECYCLABLE NANO- ORGANOCATALYST AND ITS APPLICATION FOR THE O-ARYLATION OF PHENOLS WITH ARYL HALIDES
Publish place: اولین همایش سالانه شیمی و مهندسی شیمی ایران
Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
CHCONFERENCE01_051
تاریخ نمایه سازی: 7 اسفند 1396
Abstract:
Chitosan (CS) is modified with Fe 3O4 nanocomposite through in situ co-precipitatin of Fe3+ and Fe2+ ions via NH4OH, in an aqueous solution. This resultes in the formation of magneitc Fe3O4/CS NPs. Adsorption of Cu2+ ions on the surface of the latter is followed by reduction of Cu2+ via NaBH NaBH4. Nanoparticle Fe3O4/CS-Cu NPs is used as a heterogeneous catalyst for the synthesis of diaryl ethers by the cross-coupling reaction of various substituted aryl halides with phenols. This catalyst avoids using any type of expensive ligand and can be recovered from the reaction mixture by using a simple magnet. Moreover, it can be reused three times without losing its catalytic activity.