Product selectivity control induced by using liquid–liquid parallel laminar flow in a microreactor
作者:Fumihiro Amemiya、Hideyuki Matsumoto、Keishi Fuse、Tsuneo Kashiwagi、Chiaki Kuroda、Toshio Fuchigami、Mahito Atobe
DOI:10.1039/c1ob05174a
日期:——
Product selectivity control based on a liquidâliquid parallel laminar flow has been successfully demonstrated by using a microreactor. Our electrochemical microreactor system enables regioselective cross-coupling reaction of aldehyde with allylic chloridevia chemoselective cathodic reduction of substrate by the combined use of suitable flow mode and corresponding cathode material. The formation of liquidâliquid parallel laminar flow in the microreactor was supported by the estimation of benzaldehyde diffusion coefficient and computational fluid dynamics simulation. The diffusion coefficient for benzaldehyde in Bu4NClO4-HMPA medium was determined to be 1.32 Ã 10â7 cm2sâ1 by electrochemical measurements, and the flow simulation using this value revealed the formation of clear concentration gradient of benzaldehyde in the microreactor channel over a specific channel length. In addition, the necessity of the liquidâliquid parallel laminar flow was confirmed by flow mode experiments.
基于液-液平行层流的产物选择性控制已通过使用微反应器成功展示。我们的电化学微反应器系统实现了醛与烯丙基氯的区域选择性交叉偶联反应,这是通过结合适当的流动模式和相应的阴极材料进行的化学选择性阴极还原底物来实现的。微反应器中液-液平行层流的形成得到了苯甲醛扩散系数的估算和计算流体动力学模拟的支持。通过电化学测量确定苯甲醛在Bu4NClO4-HMPA介质中的扩散系数为1.32 × 10⁻⁷ cm²s⁻¹,使用该值进行的流动模拟揭示了在微反应器通道内特定通道长度上苯甲醛的清晰浓度梯度。此外,通过流动模式实验确认了液-液平行层流的必要性。