A new homologous series of mesogens containing 6-amino-1,3-dimethyluracil moiety have been synthesized. The structures of the compounds were characterised by elemental analysis, FT-IR, 1H and 13C NMR spectroscopic techniques. Their mesomorphic properties were studied by polarising optical microscopy attached to a heating stage. Microscopy data were supported with transition temperatures and enthalpy
已经合成了包含6-氨基-1,3-二甲基尿嘧啶部分的新的同源的介晶系列。化合物的结构通过元素分析,FT-IR,1 H和13 C NMR光谱技术表征。通过连接到加热台的偏振光学显微镜研究了它们的介晶性质。从差示扫描量热分析获得的转变温度和焓变值支持了显微镜数据。研究表明,化合物的介晶性质取决于烷氧基间隔基的长度。具有较短烷氧基-间隔链(n = 6)的化合物4a-f表现出近晶A相,而化合物4g-r 烷氧基-间隔链(n = 8或10)显示向列相。
<i>sp</i><sup>3</sup> C–H Arylation and Alkylation Enabled by the Synergy of Triplet Excited Ketones and Nickel Catalysts
作者:Yangyang Shen、Yiting Gu、Ruben Martin
DOI:10.1021/jacs.8b07405
日期:2018.9.26
polypyridyl complexes. Additionally, such a platform provides a new strategy for streamlining the synthesis of complex molecules with high levels of predictable site-selectivity and preparative utility. Mechanistic experiments suggest that sp3 C-H abstraction occurs via HAT from the ketone triplet excited state. We believe this study will contribute to a more systematic utilization of triplet excited ketones
A series of novel [n]rotaxanes based on a tetraphenylethene (TPE) backbone were constructed by a template-directed clipping approach and their structures were well-characterized.
一系列基于四苯乙烯(TPE)骨架的新型[ n ]轮烷通过模板引导的剪接方法构建,并且它们的结构得到了良好的表征。
compounds were synthesized and tested for inhibitoryactivity. All of them were between 11 and 95 times more active than galantamine. The novel galantamine derivatives with indole moiety have dual site binding to the enzyme—the galantamine moiety binds to the catalytic anionic site and the indole moiety binds to peripheral anionic site. Additionally, the indole moiety of one of the novel inhibitors binds