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کاتالیزور کاربردی a: عمومی 2012
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  • the concentration effects of reactants and components in the pd(oac)2/p-toluenesulphonic acid/trans-2,3-bis(diphenylphosphinomethyl)-norbornane catalytic system on the rate of cyclohexene hydrocarbomethoxylation

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 837
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the reactants and components of a catalytic system were studied for their effects on the rate of pd-catalysed cyclohexene hydrocarbomethoxylation. first-order reaction rate dependences were established for cyclohexene and pd(oac)2, while non-monotonic rate dependences were determined for the diphosphine and p-toluenesulphonic acid concentrations and the со pressure. the reaction was shown to follow first-order kinetics when the methanol concentration was below 0.4 mol/l; however, the reaction rate slowed upon a further increase in the methanol concentration. the obtained results were interpreted by considering a hydride mechanism supplemented with ligand exchange reactions, which decreased the activity of the catalyst, and with hydride complex annihilations by p-toluenesulphonic acid, resulting in complete loss of catalytic activity. treatment of the proposed mechanism using the quasi-equilibrium concentration method gave a kinetic equation for the reaction that was consistent with the experimental data.

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