Soft-ionization mass spectrometric observation of isomeric effects occurring in the synthesis of bis-sulfonium salts from thiacyclanes/xylylene dibromides and collision induced dissociation of bis-sulfonium cations
作者:Anton V. Kozlov、Roman S. Borisov、Vladimir G. Zaikin
DOI:10.1016/j.ijms.2018.07.003
日期:2018.9
Abstract Micro-synthesis of bis-sulfonium salts from ortho-, meta- and para-xylylene dibromides and mono- and bicyclic sulfides was performed for their further investigation by tandem electrospray/ionization mass spectrometry (ESI-MS) with the use of collision-induced dissociation (CID). Reaction products were detected by ESI-MS (without chromatographic separation), combined high-performance liquid
摘要 为了通过串联电喷雾/电离质谱 (ESI-MS) 和碰撞-质谱法(ESI-MS)进一步研究从邻、间和对亚二甲苯基二溴化物以及单环和双环硫化物微合成双锍盐诱导解离 (CID)。反应产物通过 ESI-MS(无色谱分离)、高效液相色谱/ESI-MS 和基质辅助激光解吸/电离质谱(MALDI-MS)检测。结果表明,只有邻-和对-亚二甲苯基二溴化物与环状硫化物的反应产生相应的双锍盐,产生在 ESI 和 MALDI 电离期间从双电荷离子中消除质子化硫化物的产物。首次研究了在 ESI 条件下产生的双锍偶电子 dications 的断裂途径。质谱显示只有单电荷碎片的峰包括硫环烃残基、苯和含硫离子。观察并解释了邻位异构体和间位(对位)异构体之间显着的定量和定性差异,使它们易于区分。它们表现为硫环烷残留物的消除特性和m/z 104 和91 含苯离子的峰强度比。具有单环硫化物区域异构结构的异构双阳离子在 CID