This report describes an efficient nitrating system for the nitration of arenes at room temperature by using an equivalent of nitric acid in HFIP (1,1,1,3,3,3-hexafluoroisopropanol). The π-complex intermediate of an arene with a nitronium ion stabilized by HFIP can be directly observed by UV–vis spectra and is supported by theoretical calculations.

中文翻译：

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HNO ₃ / HFIP：直接观察π-复杂中间体的芳烃硝化系统

该报告介绍了一种高效的硝化系统，用于在室温下通过在HFIP中使用等价的硝酸（1,1,1,3,3,3-六氟异丙醇）硝化芳烃。UV-vis光谱可直接观察到芳烃与HFIP稳定了硝基离子的π-络合物中间体，并得到了理论计算的支持。