Mutyala Sateesh

Acylation of aromatic ethers with acid anhydrides in the presence of cation-exchanged clays

Abstract Friedel–Crafts acylation of aromatic ethers with acid anhydrides in the presence of mesoporous material, cation-exchanged K10 montmorillonite (M n + – mont., where M n + =Fe 3+ , Zn 2+ , Cu 2+ , Al 3+ and Co 2+ ) was investigated. Fe 3+ - and Zn 2+ -exchanged montmorillonites displayed higher activities ascribed to the synergistic effect of Bronsted and Lewis acidities. Selective acylation is a significant achievement with the formation of 1-acyl-2-methoxynaphthalene, 4-acyl anisole and 4-acyl veratrole from respective aromatic ethers.

Iron pillared clays-efficient catalysts for Friedel-Crafts reactions

Abstract Friedel-Crafts alkylations of aromatic hydrocarbons have been carried out in the presence of a series of clay catalysts originating from K10 montmorillonite and Kunipia. It was found that the iron pillared clays (FePILCs) were the most efficient catalysts producing quantitative conversions with greatly reduced amounts of catalysts in lesser reaction times. Their efficiency is attributed to the higher Fe 3+ contents in the catalysts and the pillaring effect.

Selective nitration of aromatic compounds by solid acid catalysts

High activity and para-selectivity in the nitration of aromatic compounds is achieved by a high density of acidic sites and ready formation of the para-isomer in the pores of zeolite beta with low Si/Al ratio as revealed by molecular modeling studies.

Selective Acetylation of 5-Numbered Aromatic Heterocycle Compounds Using Metal-Exchanged Clay Catalysts

Acetylation of 5-numbered aromatic heterocycle compounds under very mild conditions to 2-acetyl derivatives selectively in good yields using metal-exchanged clays as catalysts is described for the first time.