Recent advances on controllable and selective catalytic oxidation of cyclohexene

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles

“…Based on our experimental observations and those previously made by other authors [ 15 – 17 41 – 44 ], we assumed that a radical oxidation process could be taking place. To test this assumption, the epoxidation of styrene was carried out under the optimized conditions by adding hydroquinone (5 mg, 0.045 mmol) as radical scavenger.…”

“…Despite many methodologies for the synthesis of epoxides have been reported, efficient and selective epoxidation of olefins remains a challenge. Due to safety and environmental issues, traditional methods involving the use of stoichiometric amounts of harmful oxidants (for example, peroxosulfates [13] or organic peracids [14]) have been replaced by the use of greener oxidizing agents as molecular oxygen, hydrogen peroxide or tert-butyl hydroperoxide (TBHP) [14][15][16][17]. However, using any of these oxidants alone results in considerable low reactivity and selectivity in olefin epoxidation reactions.…”

Magnetically separable and reusable rGO/Fe3O4 nanocomposites for the selective liquid phase oxidation of cyclohexene to 1,2-cyclohexane diol

“…Cyclohexene is one of the most widely used raw materials in chemical industries because of its low cost, availability and chemical structure. 1 Since there are two potential oxidation sites existing in its structure, a mixture of different oxidation products was formed in its oxidation. 2 Cyclohexene oxide (epoxide) and 1,2-cyclohexane diol (diol) are formed if the oxidation occurs at the double bond (C]C) position.…”

Porphyrin–Nanodiamond Hybrid Materials—Active, Stable and Reusable Cyclohexene Oxidation Catalysts

“…The oxidation of cyclohexene is of great interest, as its products (key C6 chemicals) are largely used as intermediates in the pharmaceutical/chemical industries [33,34]. A wide variety of catalysts have been used for the oxidation of cyclohexene with O 2 as an oxidant, such as ionic liquids; metal complexes, including metalloporphyrins; noble metals; and metal complexes immobilized on solid supports (carbon nanotubes, magnetic nanoparticles, titanium dioxide), as reported in a recent review [35]. However, controllable oxidation reactions that can selectively yield 7-oxabicyclo [4.1.0] heptane, trans/cis-cyclohexane-1,2-diol, cyclohex-2-en-1-ol, cyclohex-2-en-1-one and adipic acid, using O 2 as a green oxidant, in solvent-free conditions, and using a stable, reusable and non-toxic catalyst, are still a challenge.…”