Theory and Defination :
The conversion of aryl amines to aryl fluorides via diazotisation and subsequent thermal decomposition of the derived tetrafluoroborates or hexafluorophosphates is known as Balz-Schiemann Reaction . The decomposition may also be induced photochemically.This reaction is named after German chemists Gu¨u¨nther Schiemann and Gu¨u¨nther Balz.It is similar to Sandmayer reaction.
General Reaction :
The conversion of aryl amines to aryl fluorides via diazotisation and subsequent thermal decomposition of the derived tetrafluoroborates or hexafluorophosphates. The decomposition may also be induced photochemically.
Mechanism
The mechanism of the Balz-Schiemann reaction remains obscure. A possible pathway is shown below:
Examples :
1)
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