Journal
REACTION KINETICS MECHANISMS AND CATALYSIS
Volume 124, Issue 2, Pages 779-805Publisher
SPRINGER
DOI: 10.1007/s11144-018-1399-8
Keywords
Oxovanadium(IV); Dipyridinyl-urea; Catalysis; Oxidation; cis-Cyclooctene; 1-Octene; Organometallic-vanadium intermediate
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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, H2O2, 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.
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