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Mechanism of ozonolysis of 2- butyne
Accepted Answer
The ozonolysis of 2-butyne proceeds through a series of steps:
1. Ozonide formation: Ozone (O3) reacts with 2-butyne to form a primary ozonide, a cyclic intermediate containing an unstable [3+2] adduct. This is an electrophilic addition reaction.
2. Ozonide cleavage: The primary ozonide is unstable and decomposes into a carbonyl compound (in this case, two molecules of acetone) and a molecule of oxygen.
3. Reductive workup: The reaction is typically followed by a reductive workup using a reducing agent like zinc dust and water. This converts any remaining ozonide into the carbonyl product, ensuring complete ozonolysis.
The overall reaction can be summarized as follows:
CH3-C≡C-CH3 + 3 O3 → 2 CH3-CO-CH3 + 3 O2
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