The controllable mass transfer and reaction rate for phase transfer hydrogenation of acetophenone across a well‐defined boundary were investigated. The effect of solvent was found important and 1‐butanol exhibited the best performance among the five investigated homologous alcohol solvents, consistent with its higher solubility in water and greater dielectric constant. Initial reaction rates increased with increasing electric potential, consistent with enhanced mass transfer across the aqueous/organic boundary. At longer reaction times, deactivation was apparent. It correlated with increasing voltage and is ascribed to lower equilibrium concentration of reactive species at the interface. External control over reaction rate was demonstrated by switching the applied electric potential over the course of the reaction. Effects of external electric field on enantioselectivity were also explored with reversal field direction. The changes correlate with catalyst decomposition.

中文翻译：

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施加低外电场控制苯乙酮相转移加氢反应速率

研究了跨越明确边界的苯乙酮相转移加氢的可控质量转移和反应速率。发现溶剂的作用很重要，在所研究的五种同源醇溶剂中，1-丁醇表现出最好的性能，这与其在水中的溶解度更高和介电常数更高相一致。初始反应速率随电势的增加而增加，这与跨水/有机边界的传质增强相一致。在更长的反应时间下，失活是显而易见的。它与增加的电压相关，并且归因于界面处反应性物质的较低平衡浓度。通过在反应过程中切换施加的电势来证明对反应速率的外部控制。反向电场方向也探讨了外部电场对对映选择性的影响。该变化与催化剂分解相关。