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自由基反应已普遍应用于有机合成。涉及电子转移过程的一个重要试剂是 S_2O_8~(2-),S_2O_8~(2-)在银盐催化下可氧化羧酸形成烷基自由基:
Free radical reaction has been widely used in organic synthesis. An important reagent involved in electron transfer process is S_2O_8 ~ (2 -). S_2O_8 ~ (2-) can oxidize carboxylic acid to form alkyl free radical under the catalysis of silver salt: