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- W2078431946 abstract "Continuous enantioselective hydrogenation of 1-phenyl-1,2-propanedione was investigated at 25 °C and 5 bar H2 over a knitted Pt silica fiber catalyst modified with cinchonidine. The main reaction parameters were the reactant and modifier concentrations, the liquid space time and the pre-treatment of the catalyst. The initial hydrogen uptake rate decreased about 25–45% within 20 min time-on-stream. The catalyst deactivation was quantitatively described with a mechanistic model, which assumed that the deactivation is of first-order in reactant concentration. The amount of modifier did not affect the reaction rate. The steady-state regioselectivity of 1-hydroxy-1-phenylpropanone and enantioselectivity of the main product, (R)-1-hydroxy-1-phenylpropanone, were independent of reactant inlet concentration and space time. The enantioselectivity of the main product, (R)-1-hydroxy-1-phenylpropanone, increased from zero to the highest enantiomeric excess (ee=60%) with increasing time-on-stream, after which it attained a steady-state value, dependent on the modifier concentration. Continuous feeding of the modifier was necessary to maintain a constant ee." @default.
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- W2078431946 date "2002-08-01" @default.
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- W2078431946 title "Continuous hydrogenation of 1-phenyl-1,2-propanedione under transient and steady-state conditions: regioselectivity, enantioselectivity and catalyst deactivation" @default.
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- W2078431946 doi "https://doi.org/10.1016/s0926-860x(02)00262-4" @default.
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