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Gas-phase fragmentations of N-methylimidazolidin-4-one organocatalysts

机译:N-甲基咪唑烷-4-一体有机催化剂的气相碎片

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N-methylimidazolidin-4-one organocatalysts were studied in the gas phase. Protonated and sodium-cationized (sodiated) molecules are conveniently accessible by electrospray mass spectrometry. Protonation enables three different closed-shell paths of ring cleavage leading to iminium ions. The fragmentation pattern is largely unaffected by exocyclic substituents and thus is valuable to characterize the substance type as N-methylimidazolidin-4-ones. Sodiated species show a distinctly different fragmentation that is less useful for characterization purposes: apart from signal loss due to dissociation of Na+, the observation of benzyl radical loss is by far predominant. Only in absence of a benzyl substituent, an analogue of the third ring cleavage (loss of [C2H5NO]) is observed. Copyright (C) 2017 John Wiley & Sons, Ltd.
机译:在气相中研究了N-甲基咪唑烷-4-一个有机催化剂。 通过电喷雾质谱法方便地接近质子化和阳离子化(链接)分子。 质子化能够实现导致亚胺离子的三种不同的封闭壳路径。 碎裂模式大大不受官方取代基的影响,因此有价值的是表征物质类型作为N-甲基咪唑烷-4-α。 SOIDIAL物种显示出明显不同的碎裂,其对表征目的不太有用:除了Na +的解离引起的信号损失之外,苄基根治根损失的观察是远定主导的。 仅在没有苄基取代基的情况下,观察第三环切割的类似物(丧失[C2H5NO])。 版权所有(c)2017 John Wiley&Sons,Ltd。

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