用裂解色谱法鉴定羧酸酯的结构  

Structural Identification of Carboxylic Esters by Pyrolysis Gas Chromatography

作　　者：刘尔嘉[1] 陈文蕾[1] 

机构地区：[1]北京服装学院精细化工系

出　　处：《色谱》1997年第1期36-38,共3页Chinese Journal of Chromatography

摘　　要：研究了用裂解气相色谱法鉴定羧酸酯结构的方法。对一些一元酸酯和二元酸酯进行了普通裂解和与碱石灰混合后的裂解，依据裂解产物可确定酯的母体酸和母体醇。直接从薄层板上取分离后的组分，不用去除吸附剂就能进行鉴定。A pyrolysis gas chromatographic method has been investigated for structural identification of carboxylic esters The method can be applied to identify not only pure components, but also those separated by thin layer chromatography and scraped from the TLC plate without removing the adsorbent The samples were pyrolyzed in tube furnace pyrolyzer at 500℃ (conventional pyrolysis) or were pyrolyzed at 550℃ after mixing with soda lime powder (pyrolysis with soda lime) Some esters such as iso octyl palmitate, glycerol monostearate and diethyl phthalate were pyrolyzed The pyrolysis products were identified by comparing with the known The parent alcohols of monohydric and polyhydric alcohol esters can be determined respectively according to alcohols, alkenes produced on pyrolysis and dehydrated products of polyhydric alcohol at high temperature The parent acids of monocarboxylic esters can be determined according to carboxylic acid produced on conventional pyrolysis or corresponding alkane formed from decarboxylation of parent acids on pyrolysis with soda lime For esters formed from dicarboxylic acids that can be dehydrated to produce five ,six membered cyclic ketones or can be dehydrated and decarboxylated simultaneously to produce five , six membered cyclic acid anhydrides, parent acids can be determined according to corresponding cyclic ketones or cyclic acid anhydrides This method is useful for identification of common carboxylic esters When the compound or the component of the mixture was confirmed to contain ester group by infra red spectroscopy, PGC or TLC PGC can be employed to make further identification

关 键 词：裂解气相色谱法 薄层色谱法 羧酸酯 

分 类 号：O623.624[理学—有机化学] O657.71[理学—化学]