氟代仲丁烷热稳定性的气相色谱法研究  

Gas Chromatographic Study of the Thermo-Stability of 2-Fluorobutane

作　　者：韩江华[1] 罗运军[1] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081

出　　处：《北京理工大学学报》2005年第7期641-645,共5页Transactions of Beijing Institute of Technology

摘　　要：利用气相色谱技术对氟代仲丁烷的热稳定性进行了考察,并通过对氟代仲丁烷的热消除产物的定性定量分析,讨论了其热分解机理,以四圆环状过渡态历程和碳正离子重排历程对热消除反应的产物形成进行解释.结果表明氟代仲丁烷在高于室温的条件下即有不同程度的热消除反应发生,当温度高于120℃时快速进行热消除反应,其热消除产物主要是异丁烯、顺丁烯和反丁烯.The thermo-stability of 2-fluorobutane is studied through gas chromatography.2-fluorobutane was synthesized by nucleophilic substitution reaction of AgF with 2-bromo-butene and then thermo-decomposed in the injector of GC under different temperatures. The thermoelimination products of 2-fluorobutane were analysed on a capillary column of SE-54 （44m×0. 22min×0.25μm）. The results indicated that 2-fluorobutane start to decompose at a temperature above the room temperature and decomposes quickly at temperatures above 120℃.The main products proved to be iso-butene, trans-butene and cis-butene. Based on the results of quantitative and qualitative analysis, the mechanisms of the thermo-elimination reaction of the 2-fluorobutane are discussed, mechanisms of formation of the products are explained by the transient state theory of tetratomic rings and the rearrangement of carbon cations.

关 键 词：氟代仲丁烷 热稳定性 热消除 气相色谱法 

分 类 号：O657.7[理学—分析化学]