反应时间调控的电化学吲哚氧化偶联/偶联环化反应实验设计

吲哚类杂环化合物相关转化是有机化学基础知识。本实验以近年来快速发展的有机电合成技术为手段,以电子为清洁的反应试剂,实现了3-芳基吲哚的脱氢氧化偶联,进而仅延长反应时间即可获得偶联-环化的产物。实验涉及脱氢偶联、串联环化反应等,是重要的有机转化反应。本实验反应现象丰富,所用试剂安全,涉及操作丰富,有助于学生对实验架设、实验观察、实验处理、结果分析的全流程训练。实验经多人多次均可以相近产率重现,产物为固体,可由硅胶柱色谱纯化,结构可通过核磁共振波谱和质谱进行解析,产物具有丰富的荧光性质。该实验立足吲哚转化有机化学基础知识,利用电合成策略,开发含氮杂环化合物的实用合成方法,引导学生注重学习有机化学与物理化学交叉知识,建立学科交叉知识认知,关注学科发展前沿。

一锅三步由硝基芳烃合成邻氨基酚衍生物

硝基的选择性还原,羟胺的选择性保护,以及[3,3]-σ重排都是有机化学的基础内容。本实验将此三个基本反应融入于3.5 h的紧凑一锅法化学反应中,反应现象丰富且便于观察,利用薄层色谱能方便监测反应的进程。反应可以从简单的硝基芳烃一锅获取高官能化邻氨基酚衍生物,同时三步反应可以分解为三个单独的反应,且均能高收率得到相应化合物。产物可由硅胶柱层析纯化,化合物结构通过质谱、核磁共振波谱的解析进一步确定。该反应立足有机化学硝基官能团基础知识,适用于本科生学习官能团转化知识,观测多种实验现象,同时反应操作多样,用时紧凑,产率高,在邻氨基酚类衍生物制备中具有广泛的应用潜力。

Viscosity model of high-viscosity dispersing system

High-viscosity dispersing system is formed by dispersing the solid particles in the high-viscosity continuous medium.It is very easy to form the three-dimensional network structure for solid particles in the system and the rheology behavior becomes complicated.The apparent viscosity of this dispersing system always has the connection with the volume ratio and the shear rate.In order to discuss the rheology behavior and put up the viscosity model,the suspension of silicon dioxide and silicon oil were prepared.Through testing the viscosity,the solid concentration and the shear rate,the effects of the ratio and the shear rate on viscosity was analyzed,the model of the high-viscosity dispersing system was designed and the model with the printing ink were validated.The experiment results show that the model is applicable to the high-viscosity dispersing systems.