摘要
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.
