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te is unstable above 60 0C for benzyl or allylic alcohols, or above 20 0C for other alcohols 3. Yield of Swern Oxidation is high. However, the condition can cause epimerization of alfa chiral center and C=C migration and was not good in too small (mg) or too large scale (Kg). 4. 位阻大的 2o羥基反應(yīng)活性降低較多 10 Mechanism: 11 Swern Oxidation examples: 12 2. KMnO4: NNC lK M n O 4NNC lOOO HO HOOH O K M n O4OOH OOKMnO4氧化的特點(diǎn): 1. 強(qiáng)氧化性 2. 氧化產(chǎn)物與體系的 PH密切相關(guān),酸性條件下氧化性更強(qiáng),KMnO4的副產(chǎn)物也與 PH關(guān)系很大。 13 14 3. MnO2: General features of Swern Oxidation 1. Used in oxidizing benzyl or allylic alcohols。 2. MnO2 can be reactivated at 110130 0C for 34 h before used (Infrared oven)。 3. The reaction was carried out at room temperatu