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Why Acetals Do Not React with Nucleophiles?

Marcus Vance • • 6 min read
Why Acetals Do Not React with Nucleophiles?

Explain why acetals do not react with nucleophiles. An acetal has a very good leaving group

leaving group
The physical manifestation of leaving group ability is the rate at which a reaction takes place. Good leaving groups give fast reactions. By transition state theory, this implies that reactions involving good leaving groups have low activation barriers leading to relatively stable transition states.
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(e.g., CH3O?). An acetal has a very small size while a nucleophile has a large size. Both an acetal and nucleophile have a positive charge on oxygen atom.

Why do acetals not form under basic conditions?

Explanation: A base reacts as an acid acceptor, so it must have a proton to accept. If it's in a basic environment, there would be no proton to accept so acetal formation could not occur.

Why are acetals unstable in acidic medium?

Simple ethers have similar reactivity to acetals under basic/nucleophilic conditions. In acid, acetals are usually more reactive because they can form resonance stabilized oxocarbenium ions.

Marcus Vance
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Marcus Vance

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.