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Semiempirical quantum chemical method and artificial neural networks applied for lambdamax computation of some azo

Guo-Zheng Li1, Jie Yang, Hai-Feng Song

  • 1Institute of Image Processing and Pattern Recognition, Shanghai Jiao Tong University, Shanghai, China 200030. lgz@ajtu.edu.cn

Journal of Chemical Information and Computer Sciences
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PubMed

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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.