Friedel-crafts acylation of furan using chromium-exchanged dodecatungstophosphoric acid: effect of support, mechanism and kinetic modelling

Abstract

The Friedel-Crafts acylation of furan with acetic anhydride to produce 2-acyl furan is industrially important. With an aim of replacing the highly polluting process, it this study, supported but modi ed heteropoly acids were used. Metal exchanged dodecatungstophosphoric acid (DTP) was loaded on three different supports and its effect on acylation was evaluated. Thus, chromium exchanged DTP was supported on K-10, SiO 2 , and ZrO 2 using the incipient wetness impregnation method. 20% w/w Cr 0.66 -DTP/K-10 having the best activity for the acylation of furan with acetic anhydride was chosen for full characterization and reaction kinetics. Under optimized condition, the catalyst to furan ratio was 9.6%,

Regioselective Friedel–Crafts Acylation Reaction Using Single Crystalline and Ultrathin Nanosheet Assembly of Scrutinyite-SnO2

“…The NH 3 -TPD profile shows a broad desorption peak in the range 250–550 °C. In general, the strength of acidic sites can be divided into weak (200–300 °C), medium (300–450 °C), and high (>450 °C) regions. , The measured NH 3 -TPD profile is deconvoluted into three peaks having maximal temperatures at ∼320, 361, and 446 °C corresponding to 23, 45, and 32% of the total desorbed amount of NH 3 . All the peaks can be assigned to the medium temperature region (300–450 °C), which indicates the presence of medium strength acidic sites in the SnO 2 nanosheets .…”