A Highly Selective Synthesis of 1,1′-Bi-2-naphthol by Oxidative Coupling of Naphthol on Mesoporous Fe,Cu/MCM-41 Aluminosilicates

Highly Enantioselective Oxidative Couplings of 2-Naphthols Catalyzed by Chiral Bimetallic Oxovanadium Complexes with Either Oxygen or Air as Oxidant

“…In the presence of 5 mol % of 2f , the competitive coupling reaction proceeded to give a mixture of cross-coupled 9w , homocoupled 9 m , and 9x . The ratio of 9 m / 9w / 9x is 1:2.2:5.2, which is statistically in agreement with the radical−radical coupling mechanism. 6h,10d …”

“…This result is very important because air is the most plentiful oxidant source and is safe and environmentally benign. The air-oxidized homocouplings of 2-naphthols in the presence of transition-metal complexes in either asymmetric or racemic manner were attempted; 6b,10a however, the reactions proceeded with unsatisfactory results. Although the asymmetric oxidative coupling of 2-naphthols using air as oxidant catalyzed by a bimetallic vanadium complex in chloroform solvent proceeded successfully to give the product in high yield, a lower enantioselectivity relative to the reaction using molecular oxygen in CCl 4 was observed .…”

Oxidation of Cyclohexane Over Nanoclusters of Cu (II) Supported on Nanocrystalline Tungsten Oxide with H2O2 as Oxidant

“…The powder X-ray diffraction pattern of the Cu-W catalyst is shown in Figure 1. PXRD pattern exhibited the typical diffraction lines of the pure WO 3 phase [13] and that of Cu (II) oxide [JCPDS-89-2530]. The crystallite size of Cu (II) species was determined using the Scherrer equation (based on 2 =36.11°) and a mean particle size of 5.5 nm was observed, which matched well from that derived from TEM image.…”

Inorganic helping organic: recent advances in catalytic heterogeneous oxidations by immobilised tetrapyrrolic macrocycles in micro and mesoporous supports

“…The authors attributed this to blockage of the zeolite channels, which may have occurred during the epoxidation reaction. However, according to the Corma group studies, 25,47 the catalytic effect on the rst run (similar to all three catalysts) was probably due to the presence of adsorbed catalyst on the external surface of the zeolite, which rapidly desorbed aer the rst run, and then caused a signicant loss in activity. The same encapsulation methodology was carried out for the preparation of chloro-iron phthalocyanine 9 (Chart 3) NaY zeolite (9@NaY).…”