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推断结构式首先要判别化合物的类型。从所用的提取分离方法,可知该化合物的酸碱特性。从植物化学分类学的角度还可预测某一植物中可能存在的化合物类型。如从夹竹桃科、马钱科或茜草科的某一植物中分离出的碱性化合物,很可能是萜—吲哚类生物碱。利用薄层方法并配合一些特殊的颜色反应则可进行初步的鉴定。紫外光谱和质谱常可进一步提供一些结构信息。若要确定化合
Inferred structural formula must first determine the type of compound. From the method of extraction and separation used, the acid-base characteristics of the compound are known. From the perspective of phytochemical taxonomy, it is also possible to predict the types of compounds that may exist in a plant. Alkaline compounds, such as those isolated from a plant of the Apocynaceae, Machenko, or Rubiaceae, are most likely terpenoid-indole alkaloids. The use of thin-layer method and with some special color reaction can be preliminary identification. UV spectroscopy and mass spectrometry can often provide some structural information. To determine the combination