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Title
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پTargeted Development of Sustainable Green Catalysts for Regioselective Acylation of Aromatic Ethers with Carboxylic Acids via Chlorosulfonic Acid Coated on Poly(guanidine-triazin-sulfonamide) Grafted quartz-γ-Fe2O3
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Type
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JournalPaper
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Keywords
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Polysulfonamide; Heterogeneous catalyst; Regioselectivity; Quartz; Friedel–Crafts acylation; Reusability; Carboxylic acids
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Abstract
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The Friedel-Crafts (FC) acylation of aromatic compounds is considered among the essential and valuable reactions in organic synthesis. The present study offers a recyclable eco-friendly catalyst for FC acylation of anisole with benzoic acid derivatives. For this purpose, poly guanidine-triazine-sulfonamide (PGTSA), as a new group of sulfonamides, was immobilized on magnetic quartz (γ-Fe2O3@quatrz) surface. Afterward, it was functionalized using chlorosulfonic acid. The prepared γ-Fe2O3@quartz@PGTSA-SO3H was used as a novel recoverable nanocatalyst for the FC acylation of aromatic compounds such as anisole. Both aromatic and aliphatic carboxylic acids reacted smoothly in specific conditions and provided the desired aromatic ketones with good to very good yields. The synthesized γ-Fe2O3@quartz@PGTSA-SO3H indicates a great catalytic activity because of the combined effect of Brønsted acidity and high-density functional group. This nanocatalyst is reusable for several cycles and can be easily segregated from the reaction mixture.
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Researchers
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Ramin Ghorbani-Vaghei (Third Researcher), (Second Researcher), . . (First Researcher)
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