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A mass spectrometry-based method for differentiation of positional isomers of monosubstituted pyrazine N-oxides using metal ion complexes

机译:基于质谱的金属离子配合物区分单取代吡嗪N-氧化物位置异构体的方法

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摘要

A series of 11 pairs of substituted pyrazine N-oxides, differing in the substituent position, were examined using electrospray ionization mass spectrometry (ESI-MS) in order to use spectra to assess the differentiation of positional isomers. For each compound, mass spectra were recorded with three different metal cations, namely calcium (II), copper (II) and aluminum (III), with characterization of the observed peaks. Differentiation between regioisomeric N-oxides has been achieved by comparison of the identity and relative intensities of the peaks originating from the adduct ions formed with the metal ions. Principal component analysis (PCA) has been employed to assist in the interpretation of the results obtained with each metal ion, exploring possible trends according to the nature and position of the substituent in the pyrazine N-oxide. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译:为了使用光谱评估位置异构体的差异,使用电喷雾电离质谱(ESI-MS)检查了11对成对的取代基位置不同的一系列取代的吡嗪N-氧化物。对于每种化合物,用三种不同的金属阳离子,即钙(II),铜(II)和铝(III)记录质谱图,并表征观察到的峰。通过比较源自与金属离子形成的加成离子的峰的同一性和相对强度,已经实现了区域异构N-氧化物之间的区分。主成分分析(PCA)已用于协助解释每种金属离子获得的结果,根据吡嗪N-氧化物中取代基的性质和位置探索可能的趋势。版权所有(c)2015 John Wiley&Sons,Ltd.

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