Tricarbamate of 1,3,5‐Triaminobenzene via Curtius Rearrangement of Trimesic Acid and Subsequent Nitration
摘要:
The triethyl tricarbamate of 1,3,5-triaminobenzene was prepared from trimesic acid in five steps with 70% overall yield. The tricarbamate underwent nitration to give the mono-, di-, or trinitro analogs in excellent yield.
合成并表征了一组基于三重对称三氨基甲酸酯的新型低分子量有机胶凝剂。具有长烷基链的三氨基甲酸酯能够凝胶化各种极性和非极性有机溶剂,例如乙腈和环己烷,浓度通常低于20 g / L。使用在正十二烷中的三倍对称三氨基甲酸酯可获得最佳的有机凝胶形成,其中在临界胶凝浓度1 g / L下可形成足够透明的凝胶。1 H NMR光谱表明在非极性溶剂苯-d 6中三氨基甲酸酯的分子间氢键。其最大的UV吸收为11nm更高的氯仿比Ñ-十二烷,该红移表明苯核和氨基甲酸酯取代基之间的共轭增加,这证实了其构象从非极性溶剂变为极性溶剂。用TEM研究了氨基甲酸酯在稀溶液中的自组装行为。在大范围的溶液浓度下都观察到纤维状网络。
Safer Conditions for the Curtius Rearrangement of 1,3,5‐Benzenetricarboxylic Acid
作者:Matthew C. Davis
DOI:10.1080/00397910701555766
日期:2007.10.1
A rapid method to prepare 1,3,5-triaminobenzene and its derivatives is the tris-Curtius rearrangment of 1,3,5-benzenetricarboxylic acid. The hazards associated with the acyl azide route are minimized by using 1,2-dichloroethane as solvent. A second method that avoids acyl azide preparation uses diphenylphosphoryl azide to yield the tricarbamate in one step.
374. The preparation of symmetrical aromatic triamines and triisocyanates