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Trans-2,2',4,4'-tetramethyl-6,6'-dinitroazobenzene from Aconitum sungpanense

Xiaoling Wang1, Zongxiao Li, Bolun Yang

  • 1Environmental and Chemical Engineering Institute, Xi'an Jiaotong University, Xi'an 710049, PR China. xiaolingwangwang@eyou.com

Fitoterapia
|November 30, 2004
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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.