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|Section2= |Section7= |Section8= }} Nitrous acid (molecular formula HNO2) is a weak and monobasic acid known only in solution and in the form of nitrite salts. Nitrous acid is used to make diazides from amines; this occurs by nucleophilic attack of the amine onto the nitrite, reprotonation by the surrounding solvent, and double-elimination of water. The diazide can then be liberated to give a carbene or carbenoid. ==Structure== In the gas phase, the planar nitrous acid molecule can adopt both a ''cis'' and a ''trans'' form. The ''trans'' form predominates at room temperature, and IR measurements indicate it is more stable by around 2.3 kJ mol−1.〔 p. 462〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「nitrous acid」の詳細全文を読む スポンサード リンク
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