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nature : solvent for the reaction rate, or even balance the reaction mechanism, the majority of which occurred in the solvent of organic reactions, solvent not only the nature of the reaction rate and balance are non-response often important. Solvents can be divided into polar and non-polar solvent solvent, solvent can be divided into polar aprotic solvent and non - solvent proton dipole. Solvent effect on reaction rate constant dependent on the impact of reaction solvent molecules and the corresponding solvation of the transition state relative stability. For grades filtration states and free radicals filtering state reaction solvent effect smaller; For dipole transition-state reaction, solvent effects, such as those aprotic solvent dipole characteristics - is being hidden in the internal elements, the negative side exposed to the elements outside, with the negative-ion role, and it is - but not negative ion role, therefore, in aprotic solvents, used as a reagent anion, because it is not surrounded by solvent molecules, it is very easy to respond to accelerate reaction speed as an important tool.
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