Chapter 9: Alkynes Ch 9 contents
Ozonolysis of Alkynes

ozonolysis of alkynes

Reaction type: Electrophilic Addition

Summary

  • Overall transformation :  CºC to 2 x CO2H
  • Ozonolysis implies that ozone causes the alkyne to break (-lysis)
  • Reagents : ozone followed by aqueous work-up.
  • Note that each of the CC bonds in the CºC becomes a CO bond:
 
 What would be the products of the ozonolysis reactions of: 
(a) ethyne ? 2 molecules of methanoic acid, HCO2H
(b) 1-butyne ? two carboxylic acids, CH3CH2CO2H and HCO2H
(c) 2-butyne ? 2 molecules of CH3CO2H
(d) cyclooctyne ? a dicarboxylic acid, HO2C(CH2)6CO2H, octandioic acid

Related Reactions

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