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5,12-Dimethyl-pyrazino-[1,2-a:4,5-a']dibenzimidazole-5,12-diium dichloride dihydrate

Jie Han1, Ming-Gao Zhao, Jun Zhang

  • 1Research Institute of Shaanxi Yanchang Petroleum (Group) Co. Ltd, Ke Ji No. 2 Road 75, Xi'an 710075, Shaanxi, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|March 12, 2013
PubMed

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.