Mass spectra of new heterocycles: XII. Main fragmentation pathways of the molecular ions of 5-methylsulfanyl-1-vinyl-1H-pyrrol-2-amines under electron impact and chemical ionization
作者:L. V. Klyba、N. A. Nedolya、O. A. Tarasova、E. R. Sanzheeva
DOI:10.1134/s1070428014010072
日期:2014.1
Fragmentation patterns of 5-methylsulfanyl-1-vinyl-1H-pyrrol-2-amines under electron impact (70 eV) and chemical ionization (methane as reactant gas) were studied for the first time. The electron impact mass spectra of all the examined compounds contained a strong peak of molecular ion which decomposed along four pathways. Two pathways involved cleavage of the C-S bonds with elimination of methyl (major)
首次研究了在电子轰击(70 eV)和化学电离作用下(甲烷作为反应气体)5-甲基硫烷基-1-乙烯基-1 H-吡咯-2-胺的裂解模式。所有检查的化合物的电子冲击质谱图均包含一个强烈的分子离子峰,该峰沿四个路径分解。两条途径涉及CS键的裂解,消除了甲基(主要)和MeS自由基(次要),另外两个途径是吡咯环的分解。化学电离质谱显示出强分子[ M + H] +和奇电子[ M + H-SMe] +离子峰。N,N-二甲基-5-甲基硫烷基-4-苯基-1-乙烯基-1在以甲烷为反应气体的化学电离下,H-吡咯-2-胺的特征在于分解为[ M -C 4 H 9 N] +作为唯一的碎片离子。