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Chapter 23: Aryl Halides
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Preparation of Aryl Halides from Aryl Diazonium Salts
(review of Chapter 22)
Summary
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Aryl diazonium salts can be converted
into a aryl halides as shown above.
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These reactions can be useful as the methodology can be complementary to
other
methods.
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Of particular note are the methods for introducing -F using HBF4
(the Schiemann reaction).
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The reactions of copper salts (CuCl, CuBr) are known as the
Sandmeyer
reactions.
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Aryl diazonium salts are prepared by reaction of aryl
amines with nitrous acid, HNO2
