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Oxidative Cleavage of Alkynes with Ozone (O3)

Description: Alkynes treated with ozone (O3) will be cleaved at the triple bond to form carboxylic acids. Terminal alkynes will give carbon dioxide (CO2)
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Notes: The exact same reaction can be performed by KMnO4

Examples: 

Notes: For terminal alkynes (examples 1 and 4) the byproduct is carbon dioxide (CO2)

Mechanism: For the purposes of Org 1 / Org 2 the detailed mechanism is generally not considered to be “important”. However the mechanistic pathway is similar to that for the ozonolysis of alkenes.

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