Manganese dioxide and N,N′,N″‐trihydroxyisocyanuric acid: a novel and recyclable catalytic system for aerobic oxidation of toluene derivatives in PEG‐1000‐based dicationic acidic ionic liquid

Abstract

N,N′,N″‐trihydroxyisocyanuric acid (THICA) with MnO2 promotes the aerobic oxidation of toluene derivatives to corresponding acids in PEG‐1000‐based dicationic acidic ionic liquid (PEG1000–DAIL). It is demonstrated that THICA/MnO2 is very active and selective and several toluene derivatives are efficiently oxidized to corresponding acids under mild conditions. Both the catalyst and PEG1000–DAIL can be reused after simple separation. A plausible mechanism is also proposed based on the experimental observations. Copyright © 2015 John Wiley & Sons, Ltd.

Ionic-Liquid-Modified Carbon Quantum Dots as a Support for the Immobilization of Tungstate Ions (WO42–): Heterogeneous Nanocatalysts for the Oxidation of Alcohols in Water

“…Unfortunately, these reagents not only are toxic and expensive, but they also generate a high volume of reduced residues of heavy metals . From an economic and environmental standpoint, these restrictions encourage chemists to replace them with green oxidants such as molecular oxygen (O 2 ) and hydrogen peroxide (H 2 O 2 ), because these oxidants are available, inexpensive, atom-efficient, safe, and produce water as the only byproduct. , Based on the above considerations, the use of H 2 O 2 as a green oxidant along with immobilization (heterogenization) of catalytically active species onto the solid supports, is an effective method for alleviating the aforementioned problems in the oxidation reactions. − Among catalytically active species, tungsten-based ones, because of their excellent performance for activation of H 2 O 2 and among the various supports used for immobilization of WO 4 2– species, ionic-liquid-functionalized or modified ones have been considerably interested in various oxidation reactions. − The successful and high loading of anions on the support surface through electrostatic interactions, increase the thermal stability of a catalyst and minimizing the leaching of tungsten ions to the reaction vessels or goal product structure are the highlight features of this technique. , Despite all these advantages, the design of environmentally benign catalysts through simple and one-step synthetic methods, using inexpensive, available, and Earth-abundant sources for oxidation of alcohols is still a challenging issue for researchers.…”