一类2(1H)-喹喔啉化合物的裂解机理  

Fragmentation Mechanism for A Group of 2(1H)-Quinoxalines

作　　者：杨小兵 丁松涛[1] 王安邦[1] 李小银[1] 杨裕生[1] 胡伟华[2] 

机构地区：[1]防化研究院第一研究所,北京100083 [2]中国科学院化学研究所北京质谱中心,北京100080

出　　处：《分析测试学报》2002年第6期28-30,共3页Journal of Instrumental Analysis

摘　　要：用电子轰击质谱(EI_MS)研究了一类喹喔啉化合物 :1_烷基_3_甲基_2(1H)_喹喔啉_2_酮(1_alkyl_3_methyl_2(1H)_quinoxalin_2_one,简称AMQ ,其中alkyl=H,CH3,C2H5,n_C3H7,n_C5H11,n_C16H33) ;结果表明随着烷基链的增长 ,样品熔点通常会有所降低 ,结合在电子轰击下所产生的裂解碎片离子 ,并根据其结构特征以乙基化样品为代表 。A group of 2(1H) - quinoxalin - 2 - ones: 1 - alkyl - 3 - methyl - 2(1H) - quinoxalin - 2 - one(AMQ, alkyl=H, CH3, C2H5, n - C3H7, n - C5H11, n - C16H33)has been researched by electron impact mass spectrometry(EI - MS). The effects of different substituting alkyls on melting point were evaluated. Results show that as the length of the alkyl chain at the nitrogen on the 1 - position increases, the melting point of the compounds usually decreases. Based on the analysis of fragments appeared in EI mass spectrum, as well as the structure feature of these compounds, the fragmentation mechanism of 1 - ethyl - 3 - methyl - 2(1H) - quinoxalin - 2 - one, as an example, was proposed.

关 键 词：2(1H)-喹喔啉化合物 电子轰击质谱 取代基 熔点 裂解机理 

分 类 号：O626.41[理学—有机化学]