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The Hunsdiecker reaction (or Borodin reaction) is the organic reaction of silver salts of carboxylic acids with halogens, which gives organic halides. It is an interesting example of a halogenation reaction.
The reaction can be written as:
- R-COOAg + Br2 → R-Br + CO2 + AgBr
- 2 R-COOAg + I2 → R-C(=O)O-R + CO2 + 2 AgI
To a solution of silver carboxylate in carbon tetrachloride, elemental bromine is added.
The Hunsdiecker reaction is useful for making organic halides from silver carboxylates, such as methyl bromide from silver acetate.