<i>N,N</i>-Coupled heterobicycles from cyclic hydrazine derivatives. Part<b>6</b>. Electron ionization mass spectrometry of some substituted 1-thiocarbamoyl and 1-carbamoylpyrazolidines
作者:P. Vainiotalo、O. Morgenstern、P. H. Richter
DOI:10.1002/jhet.5570300630
日期:1993.12
The electron ionization mass spectra of six substituted 1-thiocarbamoyl and four substituted 1-carbamoyl-pyrazolidines were measured and carefully analyzed. The fragmentation pathways were elucidated by metastableion analysis and exact mass measurement. The principal fragmentations were the same for all the compounds studied. The related importance of different decomposition channels, however, varied
测量并仔细分析了六个取代的1-硫代氨基甲酰基和四个取代的1-氨基甲酰基-吡唑烷的电子电离质谱。通过亚稳态离子分析和精确的质量测定阐明了裂解途径。所有研究的化合物的主要碎片均相同。但是,不同分解通道的相关重要性随化合物的结构而变化。一些取代基也促使它们独特的断裂。最重要的反应是硫代氨基甲酰基或氨基甲酰基取代基的丢失,同时氢原子从(硫代)氨基甲酰基氮迁移至环氮,从而在m / z 72处产生电离的吡唑烷。在这种情况下,1-(N-芳基硫代氨基甲酰基)吡唑烷,电荷倾向于与分子的取代基部分一起保留。此外,对于所有研究的化合物[M-2H] +。观察到通过原始化合物的脱氢形成的离子峰。