Product mixture O3 / Zn-H2 O⟶ Final product mixture The final product mixture contains: (a) CH3

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Product mixture O3 / Zn-H2 O⟶ Final product mixture The...

Product mixture $\stackrel{\mathrm{O}_{3} / \mathrm{Zn}-\mathrm{H}_{2} \mathrm{O}}{\longrightarrow}$ Final product mixture The final product mixture contains: (a) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{CH}_{3} \mathrm{COCH}_{3}$ (b) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}+\mathrm{HCHO}$ (c) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{HCHO}$ (d) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{CH}_{3} \mathrm{COCH}_{3}+\mathrm{HCHO}$

Product mixture $\stackrel{\mathrm{O}_{3} / \mathrm{Zn}-\mathrm{H}_{2} \mathrm{O}}{\longrightarrow}$ Final product mixture
The final product mixture contains:
(a) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{CH}_{3} \mathrm{COCH}_{3}$
(b) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}+\mathrm{HCHO}$
(c) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{HCHO}$
(d) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{CH}_{3} \mathrm{COCH}_{3}+\mathrm{HCHO}$

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Key Concepts

Mechanism of Ozonide Formation and Cleavage

During ozonolysis, the alkene reacts with ozone to form a cyclic intermediate called an ozonide. In a subsequent step, when a reductive work-up is applied, this unstable intermediate is cleaved, leading to the formation of two carbonyl fragments. Understanding this mechanism is fundamental to predicting the types of products that will result from the reaction.

Ozonolysis

Ozonolysis is an organic reaction where ozone (O?) cleaves the carbon–carbon double bonds of alkenes, resulting in the formation of carbonyl compounds such as aldehydes and ketones. This reaction is widely used in synthetic chemistry to break down unsaturated molecules into smaller, often more functional, fragments.

Reductive Work-Up

A reductive work-up refers to the treatment of the ozonolysis reaction intermediate, typically an ozonide, with a reducing agent like zinc in the presence of water. This process prevents the overoxidation of the initially formed carbonyl compounds, ensuring that aldehydes and ketones are obtained as the final products instead of being further oxidized to carboxylic acids or other oxidation products.

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