Under the conditions of phase transfer catalysis and nitrobenzene as the solvent,the halogen-exchange flu-orination of 2,6-dichlorobenzaldehyde using KF as fluorin-ating agent was studied.The kinetics was investigated...Under the conditions of phase transfer catalysis and nitrobenzene as the solvent,the halogen-exchange flu-orination of 2,6-dichlorobenzaldehyde using KF as fluorin-ating agent was studied.The kinetics was investigated and the reaction rate constants were obtained under the optimumconditionsofn(KF):n(2,6-dichlorobenzaldehyde):n(Ph 4 PBr):n(acetone-furan crown ether)54:1:0.1:0.05 and temperatures of 433 K,443 K,453 K and 463 K.The results illustrated the activation energy of the first and the second step is 4.57×10^(4)J·mol^(-1) and 3.53×10^(4)J·mol^(-1),respectively.The pre-exponential factor is 4.50×10^(5) h^(-1) and 1.08×10^(5) h^(-1),respectively.Thus a reliable kinetics data could be obtained for further research.展开更多
研究了以硝基苯为溶剂,相转移催化剂作用下的2,6-二氯苯甲醛的卤素交换氟化反应。在催化机理与反应动力学方面进行了相关探讨。在n(氟化钾)∶n(2,6-二氯苯甲醛)∶n(四苯基溴化)∶n(丙酮-呋喃冠醚)=4∶1∶0.1∶0.05的最佳工艺条件下,通过...研究了以硝基苯为溶剂,相转移催化剂作用下的2,6-二氯苯甲醛的卤素交换氟化反应。在催化机理与反应动力学方面进行了相关探讨。在n(氟化钾)∶n(2,6-二氯苯甲醛)∶n(四苯基溴化)∶n(丙酮-呋喃冠醚)=4∶1∶0.1∶0.05的最佳工艺条件下,通过对433,443,453,463 K 4个温度下实验数据的分析,得出了各步的反应速率常数,并最终求得其第1步和第2步的反应活化能分别为4.57×104J/mol和3.53×104J/mol;指前因子分别为4.50×105h-1和1.08×104h-1,为进一步深入研究提供了必要的动力学数据。展开更多
文摘Under the conditions of phase transfer catalysis and nitrobenzene as the solvent,the halogen-exchange flu-orination of 2,6-dichlorobenzaldehyde using KF as fluorin-ating agent was studied.The kinetics was investigated and the reaction rate constants were obtained under the optimumconditionsofn(KF):n(2,6-dichlorobenzaldehyde):n(Ph 4 PBr):n(acetone-furan crown ether)54:1:0.1:0.05 and temperatures of 433 K,443 K,453 K and 463 K.The results illustrated the activation energy of the first and the second step is 4.57×10^(4)J·mol^(-1) and 3.53×10^(4)J·mol^(-1),respectively.The pre-exponential factor is 4.50×10^(5) h^(-1) and 1.08×10^(5) h^(-1),respectively.Thus a reliable kinetics data could be obtained for further research.
文摘研究了以硝基苯为溶剂,相转移催化剂作用下的2,6-二氯苯甲醛的卤素交换氟化反应。在催化机理与反应动力学方面进行了相关探讨。在n(氟化钾)∶n(2,6-二氯苯甲醛)∶n(四苯基溴化)∶n(丙酮-呋喃冠醚)=4∶1∶0.1∶0.05的最佳工艺条件下,通过对433,443,453,463 K 4个温度下实验数据的分析,得出了各步的反应速率常数,并最终求得其第1步和第2步的反应活化能分别为4.57×104J/mol和3.53×104J/mol;指前因子分别为4.50×105h-1和1.08×104h-1,为进一步深入研究提供了必要的动力学数据。
