A step forward towards sustainable aerobic alcohol oxidation: new and revised catalysts based on transition metals on solid supports

Abstract

Modern heterogeneous catalysts for aerobic alcohol oxidation: the state of the art.

A Highly Practical Copper(II)/TEMPO‐SO4H Catalyst System for Aerobic Oxidations of Primary Benzylic and Allylic Alcohols on Gram‐Scale in Water

“…However, the removal of catalysts from the reaction mixture requires tedious, labor‐intensive, and time‐consuming processes such as flash chromatography. To tackle the challenge, a couple of strategies such as three‐component catalytic system, immobilization on solid supports, and functionalized ionic liquid, were successfully developed . Although the easy isolation of products is realized, the synthesis of such catalysts is costly and time‐consuming.…”

Towards Mechanistic Understanding of Liquid‐Phase Cinnamyl Alcohol Oxidation with tert‐Butyl Hydroperoxide over Noble‐Metal‐Free LaCo1–xFexO3 Perovskites

“…[1] Among the various oxidation reactions, the oxidation of alcohols in the liquid phase is an important reaction for synthetic organic chemistry to produce pharmaceuticals and other fine chemicals. [2] While metal oxides as oxidizing agents in stochiometric amounts are used in established processes for these reactions, [3][4][5][6] alternative catalytic methods with oxidizing agents such as molecular oxygen, hydrogen peroxide or tert-butyl hydroperoxide (TBHP) have been extensively investigated in the past decades due to the absence of metal-containing by-products. [2,6,7] These approaches currently rely on expensive noble metal-based catalysts such as Au, Pd, Pt, or Ru, which have high catalytic activities.…”

Cu(II) Schiff base complex supported on Fe3O4 nanoparticles as an efficient nanocatalyst for the selective aerobic oxidation of alcohols

“…It is noteworthy over oxidation to carboxylic acid has not been observed by GC and IR analysis of the reaction mixture and corresponding benzaldehydes were the sole products which indicate a selective oxidation protocol. The aerobic oxidation of aliphatic secondary alcohols such as: cyclopentanol, cyclohexanol, heptan-2-ol and octan-2-ol have also been investigated under optimal conditions (Table 2, entries [12][13][14][15]. The results show that these alcohols could effectively be oxidized to corresponding carbonyl products in good conversion with high selectivity.…”

“…[1][2][3][4][5] Traditionally, this oxidation process is performed with stoichiometric amounts of toxic oxidants and/or homogeneous catalysts, but most of these reagents generate a large amount of hazardous waste causing serious environmental problems. [6,7] So, it is necessary to replace such hazardous oxidants with clean environmentally friendly reagents [8][9][10][11][12][13] Although homogeneous catalysts can often perform oxidation reactions efficiently, they are associated with drawbacks including difficulty of separation from products, deactivation of catalyst via dimerization and instability at high temperatures, which is unacceptable in terms of green and sustainable chemistry. [14][15][16] Hence, a practical method to solve aforementioned problems is to immobilize a homogeneous active molecule on a solid support.…”