环境友好碱有机催化一锅法区域选择性合成新型3,6-二芳基-4-甲基哒嗪

报道了一种新型三组分反应策略用于区域选择性合成一系列三取代的哒嗪,即于水中进行DABCO催化的苯丙酮、芳香乙二醛一水合物和水合肼三组分缩合反应。该法提供了一种绿色便利的一锅法制备各种芳基取代的3,6-二芳基-4-甲基哒嗪,它以水为溶剂, DABCO为绿色碱有机催化剂,具有高区域选择性、操作简便、产物收率高和后处理简单等优点。     

Synthesis and Characterization of Heterocyclic Functionalized Polymers by Click Reaction: Preparation of Magnetic Nanocomposites and Studies on Their Thermal,Mechanical, Photophysical and Metal Ions Removal Properties

This work reports synthesis and characterization of heterocyclic functionalized polymers, poly(triazole-etherimidazole)s(PTAEI), from a dialkyne-terminated compound, 3-(4,5-bis(4-(propargyloxy)phenyl)-1H-imidazol-2-yl)-9-ethyl-9H-carbazole, by using click reaction. PTAEIs were characterized and their properties such as solubility, thermal, mechanical, photophysical and metal ions adsorption were investigated. These polymers had weight average molar masses(Mw) in the range of 19100-26700 g/mol, exhibited excellent solubility in polar aprotic solvents and formed low-colored flexible thin films by solution casting method. They exhibited good thermal stability with glass transition temperatures(Tg) between 160 °C and 211 °C and 10% weight loss temperatures(T10%) in the range of 308-426 °C. Nanocomposites of PTAEIs with epoxide-terminated Fe3O4 showed that strong interfacial interaction between inorganic particles and the polymer matrix contributed to the enhanced thermal and mechanical properties. The photoluminescence intensity of the PTAEIs increased and the spectra red shifted with increasing Fe3O4 content. The PTAEIs and nanocomposites were tested for their extraction capability of metal ions from aqueous solutions either individually or in the mixture.