以80%水合肼为还原剂、FeCl_3/C为催化剂,还原6-硝基-1,2-苯并吡喃酮制备6-氨基-1,2-苯并吡喃酮,并通过~1 H NMR、IR、^(13)C NMR和LC-MS表征了目标产物的结构,HPLC分析纯度达99%以上。同时探究了水合肼用量、反应温度、反应时间以及催...以80%水合肼为还原剂、FeCl_3/C为催化剂,还原6-硝基-1,2-苯并吡喃酮制备6-氨基-1,2-苯并吡喃酮,并通过~1 H NMR、IR、^(13)C NMR和LC-MS表征了目标产物的结构,HPLC分析纯度达99%以上。同时探究了水合肼用量、反应温度、反应时间以及催化剂用量对反应的影响。较佳的合成工艺条件为:n(80%水合肼)∶n(6-硝基-1,2-苯并吡喃酮)=2.5,FeCl_3用量为0.8g,活性炭用量为0.2g,反应温度为78℃,反应时间3.5h,收率可达85.0%。展开更多
An optical fiber sensor composed of a dislocation Mach-Zehnder interferometer(MZI) cascaded with a fiber Bragg grating(FBG) is proposed,and it is used to monitor the electrochemical corrosion of metals in experiments....An optical fiber sensor composed of a dislocation Mach-Zehnder interferometer(MZI) cascaded with a fiber Bragg grating(FBG) is proposed,and it is used to monitor the electrochemical corrosion of metals in experiments.The dislocation interferometer is composed of two segments of single-mode fiber(SMF) and one segment of dislocation SMF.The contact surface is increased between the fiber and the environment,which helps to improve the interference sensitivity.The relationship between the dislocation amount and the refractive index sensitivity of the interferometer is discussed through simulation.In the experiment,the sensitivity of the interferometer reaches more than 10 000 nm/RIU,and the monitoring of metal electrochemical corrosion is also realized in 3.5% NaCl solution.The proposed measurement scheme has the advantages of small structure,low cost and high sensitivity.It has good prospects in chemical reaction monitoring.展开更多
文摘以80%水合肼为还原剂、FeCl_3/C为催化剂,还原6-硝基-1,2-苯并吡喃酮制备6-氨基-1,2-苯并吡喃酮,并通过~1 H NMR、IR、^(13)C NMR和LC-MS表征了目标产物的结构,HPLC分析纯度达99%以上。同时探究了水合肼用量、反应温度、反应时间以及催化剂用量对反应的影响。较佳的合成工艺条件为:n(80%水合肼)∶n(6-硝基-1,2-苯并吡喃酮)=2.5,FeCl_3用量为0.8g,活性炭用量为0.2g,反应温度为78℃,反应时间3.5h,收率可达85.0%。
基金supported by the National Natural Science Foundation of China (Nos. 61835006 and 12274238)。
文摘An optical fiber sensor composed of a dislocation Mach-Zehnder interferometer(MZI) cascaded with a fiber Bragg grating(FBG) is proposed,and it is used to monitor the electrochemical corrosion of metals in experiments.The dislocation interferometer is composed of two segments of single-mode fiber(SMF) and one segment of dislocation SMF.The contact surface is increased between the fiber and the environment,which helps to improve the interference sensitivity.The relationship between the dislocation amount and the refractive index sensitivity of the interferometer is discussed through simulation.In the experiment,the sensitivity of the interferometer reaches more than 10 000 nm/RIU,and the monitoring of metal electrochemical corrosion is also realized in 3.5% NaCl solution.The proposed measurement scheme has the advantages of small structure,low cost and high sensitivity.It has good prospects in chemical reaction monitoring.
