Thermodynamic Estimation for Synthesis Mechanism of Dicamba Methyl Ester

Thermodynamic estimation for synthesis mechanism of dicamba methyl ester is performed by the method of Benson, Fedors and Rozicka-Domalski group contributions. The relationship formula of the enthalpy change, Gibbs free energy change and equilibrium constant change with temperature are established at 298.15—383.15 K. The results show that this reaction is endothermic. The change of Gibbs free energy is negative and the equilibrium constant K is 1020, so the reaction is feasible in thermodynamics. Finally, the thermodynamics analysis is confirmed by the experiment results.