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DESCRIPTION: Diazonium compounds or diazonium salts are a group of organic compounds which possess the following functional group R−N2+X− where X is an organic or inorganic anion (for example, Cl–, Br–, BF4–, etc.) and R is an alkyl or aryl group. The most widely practised reaction of diazonium salts is azo coupling. In this process, the diazonium compound is attacked to undergo an electrophilic aromatic substitution. Its process can be seen in Figure 1 below.

Figure 1. Diazo coupling reaction formula. NOTE: The organic or inorganic ion (‘X’) in this reaction is not seen. Source of figure: Chemistry of the Diazonium and Diazo Groups: Part 1. S. Patai, Ed. 1978 Wiley-Blackwell. ISBN 0-471-99492-8. Chemistry of the Diazonium and Diazo Groups: Part 2. S. Patai, Ed. 1978 Wiley-Blackwell. ISBN 0-471-99493-6. NOTE: Ar = aromatic ring However diazonium salts can also be transformed into all kinds of useful functional groups through displacement of the N2 group. An example is shown in Figure 2...

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