Abstract
MQCC (Cr(VI)-6-methylquinoline) complex was synthesized by the reaction of 6-methylquinoline with chromium(VI) trioxide in 6 M HCl. The structure was characterized using IR (Infrared Spectroscopy) and ICP (Inductively Coupled Plasma) analysis. The oxidation of benzyl alcohol using 6-MQCC in various solvents showed that the reactivity increased with the increase of the dielectric constant, in descending order of DMF > acetone > chloroform > cyclohexene. In the presence of DMF solvent with acidic catalyst such as sulfuric acid (H2SO4 solution), 6-MQCC oxidized benzyl alcohol (H) and its derivatives (p-OCH3, m-CH3, m-OCH3, m-Cl, m-NO2) were effectively oxidized. Electron-donating substituents accelerated the reaction rate, whereas electron acceptor groups retarded the reaction rate. The Hammett reaction constant (ρ) was -0.69 (308 K). The observed ex- perimental data was used to rationalize the fact that the hydride ion transfer occurred at the rate-determining step.
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