Cyclooctene Case Study

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3.2 Catalytic activity for epoxidation of cyclooctene using the investigated VO-complexes The catalytic performance of VO-complexes (L1VO, L2VO, L3VO or L4VO) was investigated in the epoxidation of cyclooctene as a representative alkene in an epoxidation processes with an aqueous H2O2 as oxygen donors. A series of blank experiments revealed that the presence of both catalyst and oxidant is essential for an effective catalytic epoxidation cyclooctene [35]. In order to find the suitable reaction conditions, the effect of various reaction parameters that may affect the chemo- and stereoselective conversion were studied. Type and concentration of catalysts, solvent, and temperature are the factors that have been evaluated to optimize the catalytic…show more content…
in acetonitrile, methanol and acetone, whereas, they are poorly soluble in less or nonpolar solvents, e.g., chloroform, dichloromethane, ethers and benzene. The tentative molecular structure of the studied VO-complexes has a remarkable impact on their solubility and stability [42]. The catalytic reactivity of the catalyst complexes depends upon their solubility. Subsequently, L1VO and L3VO are more reactive as catalysts for the epoxidation of cyclooctene by an aqueous H2O2 than L2VO and L4VO. These results are in agreement with the experimental observation. L1VO and L3VO exhibit relatively similar initial catalytic activities for the epoxidation of cyclooctene with an aqueous H2O2, although there is a smaller dispersion in the final yield of the epoxy product, the control selectivity at the optimized reaction conditions. The same behavior was also observed for both L2VO and L4VO. The main difference in the chemical structure between L1VO and L3VO is the aromatic derivatives, i.e., naphthyl and o-ethoxy phenyl derivatives for L1VO and L3VO, respectively. It is already well known that naphthyl group is more organic in nature than the o-ethoxy phenyl group. Hence, L1VO has more organic nature than L3VO because of the naphthyl group and so it is more soluble in the reaction media, in acetonitrile as the organic

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