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Which of the following reagents can be used to oxidize primary alcohols to aldehydes? Pcc KMnO4...

Which of the following reagents can be used to oxidize primary alcohols to aldehydes?

Pcc
KMnO4
H2O2
MnO2
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Answer #1

For conversion of primary alcohol to Aldehyde the selective oxidizing agent is required which stops oxidation at Aldehyde stage and do not proceed to carboxylic acid. The reagent useful for this conversion is PCC and MnO2.

  1. PCC: Pyridinium chlorochromate. See structure in image file. Preparation: Chromium (VI) oxide in HCl is added with pyridine and extracted with dichloromethane. Selectivity is because the no free chromate ion remains in solution due to complex formation.
  2. MnO2: Especially useful for Allylic and Benzylic primary alcohol oxidation to Aldehyde. Work under mild and neutral conditions.
  3. KMnO4 is strong oxidizing agent and gives carboxylic acid as final product from primary alcohol. And H2O2 hydrogen peroxide do not oxidize alcohols.
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