Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co²⁺

Abstract

Mesoporous eHA@Co2+ nanorods with effective solvent-free oxidation of cyclohexene to allylic products with O2 have been successfully fabricated by HCl selective etching of Al2O3 from halloysite nanotubes and the impregnation method consecutively.

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

“…13 The metal-based catalysts are usually more advantageous than organocatalysts in the liquid phase oxidation because of their high stability, ease of separation and recyclability. 14,15 Different types of oxidants were also used to catalyze the oxidation of cyclohexene. 16 The main oxidants used are alkyl hydroperoxides, hydrogen peroxide, molecular oxygen and air.…”

Poly(Methyl Methacrylate) Coatings Containing Flame Retardant Additives from Suspensions in Water-2-Propanol

“…The FTIR spectrum of PMMA ( Figure 5 B) and spectra of the composite materials ( Figure 5 C) showed peaks at 1149 cm −1 due to symmetric C-O-C stretching, 1439 cm −1 due to CH 2 bending, 1721 cm −1 due to C = O stretching, and 2951 cm −1 due to asymmetric CH 3 stretching [ 25 ]. The FTIR data for as-received halloysite ( Figure 5 B) and PMMA-halloysite ( Figure 5 C) showed broad absorptions at 1016, 907, and 531 cm −1 assigned to stretching mode Si-O-Si, bending vibrations of Al-OH, and bending and stretching vibrations of Si-O-Al [ 26 ], respectively.…”

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

“…This trend may be attributed to cyclohexene allylic products [53,54]. It is also worth mentioning the remarkable turnover number (TON) ≈ 265,000 achieved, using O2 as green oxidant, in the total absence of sacrificial additives, whereas in the literature only TONs from 1210 to ≈200,000 were reported for the same oxidation reaction [55][56][57]. The ≈200,000 TON value refers to a previous publication of Pereira and co-workers, also using a copper metalloporphyrin but immobilized in magnetic nanoparticles [55].…”