Kinetics of halogen-exchange fluorination of 2,6-dichlorobenzaldehyde |
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Authors: | Zhengyong Liang Bindong Li Chunxu Lü and Chao Feng |
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Affiliation: | (1) College of Chemical Engineering, Nanjing University of Science & Technology, Nanjing, 210094, China |
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Abstract: | Under the conditions of phase transfer catalysis and nitrobenzene as the solvent, the halogen-exchange fluorination of 2,6-dichlorobenzaldehyde
using KF as fluorinating agent was studied. The kinetics was investigated and the reaction rate constants were obtained under
the optimum conditions of n(KF):n(2,6-dichlorobenzaldehyde): n(Ph4PBr):n(acetone-furan crown ether) = 4:1:0.1:0.05 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 × 104 J·mol−1 and 3.53 × 104 J·mol−1, respectively. The pre-exponential factor is 4.50 × 105 h−1 and 1.08 × 104 h−1, respectively. Thus a reliable kinetics data could be obtained for further research.
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Translated from Chemical Engineering (China), 2007, 35(8): 33–36 译自: 化学工程] |
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Keywords: | 2 6-dichlorobenzaldehyde halogen-exchange fluorination phase transfer catalysis kinetics |
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