Glucose Heating w/ HI: Why Get N-Hexane? | Reaction Explanation

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Prolonged heating of glucose with hydroiodic acid (HI) leads to the formation of n-hexane through a reduction reaction. In this process, HI acts as a reducing agent, resulting in the oxidation of HI to iodate. This reaction is notable for its application in the synthesis of methamphetamine, as depicted in popular media. The mechanism involved is a type of reduction, which may not be commonly highlighted in introductory organic chemistry courses, where the focus is often on alcohols yielding halogen-substituted products. Understanding this reaction expands the knowledge of carbohydrate chemistry and its potential transformations.
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Why does glucose on prolonged heating with HI give n-hexane?
What mechanism/reaction type is this? All I knew till now was that alcohols would give halogen substituted products with hydrogen halides.
 
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It's a reduction with hydroiodic acid being oxidized to iodate. Btw the same reaction is used in the synthesis of methamphetamine in beeaking bad.
 
Is it a common mechanism in introductory organic chemistry?
 

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