For equal polarity filtration states and free radical filtration states, the solvent effect is small, the solvent effect is larger for the dipole transition state reaction, for example, the non proton dipole solvent is characterized by the positive end being hidden inside the molecule, the negative end is exposed to the molecule, negative end can work with positive ions, but the positive side is not with the negative ions, therefore, in the non-proton solvent, using anion as a reagent, because it is not surrounded by solvent molecules, can easily react, become an important means to speed up the reaction speed.