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Yanliang Liang1, Bo Peng, Jing Liang

  • 1Institute of New Energy Material Chemistry and Key Laboratory of Advanced Micro/Nanomaterials and Batteries/Cells (Ministry of Education), Chemistry College, Nankai University, Tianjin 300071, People's Republic of China.

Organic Letters
|February 23, 2010
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.