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讨论了１ ，２ ，３不对称取代咪唑啉盐各种离子的生成途径以及取代基对裂解方式的影响并分析了该类化合物的主要裂解方式。在所有实验中均有 ｍ／ｚ ＝ １２７（ Ｉ＋ ） 的离子峰和有机正离子 Ａ 峰存在，表明化合物１ 和２ 均为有机正离子和碘离子形成的盐。化合物１ 和２ 的质谱有相似的裂解方式：有机正离子发生失掉氮原子上的一个取代基而保留咪唑啉环产生 Ｄ， Ｅ， Ｆ 离子的裂解方式。更重要的是咪唑啉环有相同的裂解方式： Ｃ２ Ｎ３ 键和 Ｃ５ Ｎ１ 键同时断裂产生 Ｇ 离子碎片，以及 Ｃ２ Ｎ３ 键和 Ｃ４ Ｃ５ 键同时断裂产生 Ｈ 离子碎片。由于化合物１ 和２ 环上所连接的取代基不同而导致了其质谱裂解方式和程度的差异。化合物２ 的有机正离子 Ａ部分较稳定，质谱中表现为基峰，其 Ｅ， Ｆ 离子峰很弱；化合物１ 的有机正离子 Ａ 稳定性差，其相对丰度很小，其 Ｅ， Ｆ 离子峰较强。化合物１ｃ ，１ｄ ，１ｅ 的质谱中出现了比 Ａ 离子少三个单位的 Ｃ 离子峰，这是一种较特殊的裂解方式。
The formation of various ions of 1, 2, 3-asymmetric substituted imidazolinium salts and the influence of substituents on the cleavage were discussed. The main cleavages of these compounds were also analyzed. In all experiments, ion peaks of m / z = 127 (I +) and an organic positive ion A peak were present, indicating that both compounds 1 and 2 are salts of organic cations and iodides. The mass spectra of compounds 1 and 2 have a similar pattern of cleavage: the cleavages of organic cations with one substituent on the nitrogen leaving the imidazoline ring to generate D, E and F ions. More importantly, the imidazoline ring has the same cleavage mode: C2-N3 bond and C5-N1 bond break at the same time to generate G ion fragments, and C2-N3 bond and C4-C5 bond break at the same time to generate H ion fragments. Due to the different substituents attached to the rings of the compounds 1 and 2, differences in the manner and extent of their mass spectroscopic cleavage result. The organic cation A part of compound 2 is more stable, the base peak appears in mass spectrometry, and the E and F ion peaks are weak. The stability of compound 1 organic cation A is poor, its relative abundance is small, and the E, F ion peaks Strong. In the mass spectra of compounds 1c, 1d and 1e, C ions with three units less than that of A ions appear in the mass spectrum, which is a special way of cleavage.