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薄层色谱在基础有机化学制备实验中的应用主要是定性分析物质的成份;随时间掌握反应进程,准确发现存在的问题,为做好实验提供简便易行的分析手段。下面举例说明。 (一)监测反应进程,判断反应终点 由硝基苯还原制备胺,可以用薄层监测反应进程,判断反应终点①。从图1—A中可以看出,反应开始前只有硝基苯这一种物质;反应十分钟后,则反应液中既有硝基又有苯胺,见图1—B;反应
The application of TLC in the preparation of basic organic chemistry is mainly to qualitatively analyze the composition of the substance; grasp the reaction process over time, accurately find out the existing problems and provide an easy and convenient analytical method for doing experiments. Here’s an example. (A) monitoring the progress of the reaction to determine the end of the reaction nitrobenzene reduction of amines, thin layer can be used to monitor the progress of the reaction to determine the end of the reaction ①. As can be seen from Figure 1-A, before the start of the reaction there was only one nitrobenzene substance; reaction ten minutes later, both the reaction liquid nitro and aniline, see Figure 1-B; reaction