Harnessing the acidity of HF/base reagents is of paramount importance to improve the efficiency and selectivity of fluorination reactions. Yet, no general method has been reported to evaluate their acidic properties, and experimental designs are still relying on a trial-and-error approach. We report a new method based on 19F NMR spectroscopy which allows highly sensitive measures and short-time analyses
利用 HF/碱试剂的酸性对于提高氟化反应的效率和选择性至关重要。然而,尚未报道评估其酸性特性的通用方法,并且实验设计仍然依赖于试错法。我们报告了一种基于19 F NMR 光谱的新方法,可实现高灵敏度测量和短时间分析。有利的是,指标的基本属性可以通过DFT计算在上游确定,从而提供简单而稳健的半经验方法。特别是,本研究中使用的指标经过合理设计,符合概念上吸引人且常用的哈米特量表。该方法已应用于市售和最近开发的 HF/碱试剂。
[EN] NOVEL DIAMINE, POLYMER, LIQUID CRYSTAL ALIGNMENT AGENT, AND LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY ELEMENT USING SAME<br/>[FR] NOUVEAUX DIAMINE, POLYMÈRE, AGENT D'ALIGNEMENT DE CRISTAUX LIQUIDES, ET FILM D'ALIGNEMENT DE CRISTAUX LIQUIDES, ET ÉLÉMENT D'AFFICHAGE À CRISTAUX LIQUIDES FAISANT APPEL À CEUX-CI
Nitration of tert-butyloxycarbonylated aniline and 1,3,5-triaminobenzene by acetyl nitrate
作者:Matthew C. Davis、Thomas J. Groshens
DOI:10.1016/j.tetlet.2012.05.139
日期:2012.8
Acetyl nitrate was found to be an effective reagent for aromatic mono- and dinitration of Boc-protected aminobenzenes. The method was used in a new synthesis of 1,3,5-triamino-2,4-dinitrobenzene in two steps with 63% yield.