Choose the correct reagent to achieve the following transformation. O O HO OH OH O PCC O LAH O sodium borohydride chromic acid. The Role of Sodium Borohydride and Chromic Acid in the Oxidation of Alcohols

The role of Chromic Acid and Sodium Borohydride in Oxidation Of Alcohols
The chemical reaction of oxygenating alcohol involves the transfer electrons from a substrate into an oxidizing agent. Most commonly, chromic acids (CrO3) or sodium borohydride(NaBH4) are used to oxidize alcohols. Chromic acid is an oxidizing agent that is strong, while sodium borhydride is milder. According to the conditions, alcohol can be oxidized into an aldehyde (or carboxylic) acid when it is in contact with chromic acid. However, sodium borohydride is capable of oxidizing alcohols into aldehydes or ketones (Zhang & Zhang, 2010). An example of a double-step reaction is the oxidation of alcohol to a compound of carbonyl with chromic. The chromic acid first protonates the alcohol, then the resulting oxygen ion is subject to a nucleophilic assault by the chrome ion. Based on the conditions, either an aldehyde (or a carboxylic) acid is produced. The sodium borohydride case, an alcohol is converted to an aldehyde (or ketone) in one step. This takes place under moderate conditions. Zhang and Zhang (2010a): The alcohol can be oxidized into an aldehyde through the transfer of electrons between the alcohol’s borohydride anion and the alcohol. Chemists have the option to selectively oxidize alcohol products under mild conditions by using sodium borohydride or chromic acid for the oxidation. Cont…
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