Catalytic performance of binary and ternary oxovanadium complexes of dipyridinyl-urea in (ep)oxidation of cis-cyclooctene and 1-octene

Abstract

Two novel ternary and binary mono-oxovanadium(IV) complexes of acetylacetonate (ac) and 1,3-dipyridin-2-yl-urea are synthesized, as VO(acac)(L) (1:1) and VO(L) 2 (1:2). They are characterized by various physico-chemical spectroscopic tools. The formation constants K f are calculated from the spectrophotometric measurements. The catalytic potential of VO(acac)(L) and VO(L) 2 has been examined in the (ep)oxidation of alkenes (cis-cyclooctene and 1-octene) by an aqueous hydrogen peroxide, H 2 O 2 , and tert-butyl hydroperoxide, TBHP. The effects of temperature, solvent and oxidant/alkene molar ratio are studied in order to get the optimized reaction conditions. Most of the catalytic (ep)oxidation products of cis-cyclooctene and 1-octene are determined qualitatively and quantitatively using gas chromatographic analysis. The increase of the catalyst amount to double time reduces the (ep)oxidation process time with improvement of the amount of the chemoselective epoxy product.

Catalytic Potential of Mononuclear Cr(III)-Imine Complexes for Selective Oxidation of Benzyl Alcohol by Aqueous H2O2

“…For CrAL1, its stoichiometry was determined within two various methods spectrophotometrically; first is the continuous-variations method and second is the mole-ratio method. The obtained results showed that the stoichiometry of CrLA1 is 1 : 1 [22,26]. The formation constants (K f ) of CrLA2 and CrLA3 are reported and presented elsewhere [17,18].…”

“…The obtained slurry was filtered on celite, and the filtrate was diluted by acetonitrile and injected to GC instrument. The percentage of selective conversion of benzyl alcohol to BA was calculated by the standard calibration curves [22]. Agelient 5890A 19091J-413: 325 °C as GC is computerized and attached with FID (flame ionization detector) and an HP-5 capillary column (phenyl methyl siloxan 30 m × 320 μm × 0.25 μm).…”

“…Here we presented only the characteristic electronic absorption transitions of H 2 LA1 and its Cr-complex (CrLA1) to utilize their stereochemistry according to the sites and number of possible electronic transition bands [16]. H 2 LA1 shows two registered bands at 355 nm and 496 nm for the n → π * and L-CT transitions in the visible regions [22,26]. CrLA1 assigned three bands at 338 nm, 404 nm, and 450 nm, which are resulted from n → π * and ML-CT, and d−d transitions.…”

Two ionic oxo‐vanadate and dioxo‐molybdate complexes of dinitro‐aroylhydrazone derivative: Effective catalysts for epoxidation reactions, biological activity, ctDNA binding, density functional theory, andin silicoinvestigations

“…Such a study revealed that no concerted or free radical mechanism could occur in the current catalytic systems. [ 50 ]…”

Bis‐dioxomolybdenum (VI) oxalyldihydrazone complexes: Synthesis, characterization, DFT studies, catalytic epoxidation potential, molecular modeling and biological evaluations

“…MoO 2 L2 is highly soluble in water compared to MoO 2 L1, which probably improved its catalytic potential in the (ep)oxidation of 1,2‐cyclooctene, benzyl alcohol and thiophene more than that MoO 2 L1, especially with the more polar oxidant, e.g. H 2 O 2 in the aqueous media …”