首页> 外文期刊>Journal of mass spectrometry: JMS >Gas-phase fragmentation of protonated C-60-pyrimidine derivatives
【24h】

Gas-phase fragmentation of protonated C-60-pyrimidine derivatives

机译:质子化C-60-嘧啶衍生物的气相裂解

获取原文
获取原文并翻译 | 示例
           

摘要

Electrospray ionization mass spectrometry/mass spectrometry (ESI/MS/MS) and multiple stage mass spectrometry (MSn, n > 2) were used in the positive ion mode, with two different types of mass spectrometers, a quadrupole time-of-flight and an ion trap, to characterize two sets of different types of C-60-aminopyrimidine exohedral derivatives. In one set, the pyrimidine moiety bears an amino acid methyl ester residue, and in the other the pyrimidine ring is part of a nucleoside-type moiety, the latter existing as two separated diastereoisomers. We have found that retro-cycloaddition processes occur for the closed shell protonated species formed by electrospraying C-60 derivatives synthesized by Diels-Alder reactions, whereas for the C-60 derivatives synthesized via 1,3-dipolar cycloadditions, these processes did not occur. Formation of diagnostic ions allowed the differentiation between the two groups of fullerene derivatives, and between the diastereoisomerS of C-60 derivatives with a nucleoside-type moiety. In general, the fragmentation processes are strongly dependent on the protonation sites and on the structure of the exohedral moieties.
机译:在正离子模式下使用电喷雾电离质谱/质谱(ESI / MS / MS)和多级质谱(MSn,n> 2),并使用两种不同类型的质谱仪,即四极杆飞行时间质谱仪和离子阱,以表征两组不同类型的C-60-氨基嘧啶外表面衍生物。在一组中,嘧啶部分带有氨基酸甲酯残基,在另一组中,嘧啶环是核苷型部分的一部分,后者以两个分离的非对映异构体形式存在。我们已经发现,通过Diels-Alder反应合成的C-60衍生物电喷雾形成的闭壳质子化物种发生逆环加成过程,而通过1,3-偶极环加成合成的C-60衍生物没有发生逆向加成过程。 。诊断离子的形成使富勒烯衍生物的两组之间以及具有核苷型部分的C-60衍生物的非对映异构体之间得以区分。通常,碎裂过程强烈依赖于质子化位点和外面部分的结构。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号