in EtOAc (2.50 mL), a solution of benzylamine (1) (0.30 M, 1.0 equiv) and NaOH (0.33 M, 1.1 equiv) in water (2.50 mL) was added in a round bottom flask at 25 °C. After being stirred for 10 s at the same temperature, 1 M HCl aq. was added at the same temperature. (Under the flow conditions, reaction time was 2.5 s. However, under the batch conditions, it was impossible to run the reaction within 2.5 s. Thus, the reaction time was extended to 10 s.) Yields of N-benzylacetamide (4) were determined by HPLC-UV analysis using a calibration curve shown in Figure .