Maltose is a disaccharide formed from two units of glucose joined with an α(1→4) glycosidic bond in the presence of catalytic amount of acid.a. It is known that the above reaction is undergoing via SN1 mechanism. Draw aproposed mechanism for the formation of maltose from glucose. (8 marks)b. The carbocation intermediate in the above reaction is stabilized by resonanceeffect. Draw a resonance structure of the carbocation intermediate in theabove reaction. (2 marks)
Question
Maltose is a disaccharide formed from two units of glucose joined with an α(1→4) glycosidic bond in the presence of catalytic amount of acid.a. It is known that the above reaction is undergoing via SN1 mechanism. Draw aproposed mechanism for the formation of maltose from glucose. (8 marks)b. The carbocation intermediate in the above reaction is stabilized by resonanceeffect. Draw a resonance structure of the carbocation intermediate in theabove reaction. (2 marks)
Solution
a. The formation of maltose from glucose via an SN1 mechanism involves several steps:
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Protonation: The hydroxyl group on the glucose molecule is protonated in the presence of an acid. This makes the oxygen atom a good leaving group.
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Formation of carbocation: The protonated hydroxyl group leaves, resulting in the formation of a carbocation.
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Nucleophilic attack: Another glucose molecule acts as a nucleophile and attacks the carbocation, forming a glycosidic bond.
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Deprotonation: The newly formed hydroxyl group is deprotonated, resulting in the formation of maltose.
Unfortunately, I can't draw the mechanism here, but you can easily find it in any organic chemistry textbook or online.
b. The carbocation intermediate in the above reaction is stabilized by resonance. This means that the positive charge is delocalized over the molecule, reducing the overall energy of the system. Again, I can't draw the resonance structure here, but it involves the movement of electrons in the molecule to distribute the positive charge.
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