Mass spectra of some acetals
Mass spectra of some acetals
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一些缩醛的质谱
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
N. Chang
中科院分区：
文献类型：
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作者：
S. Lin;L. Tien;N. Chang
获得了五种缩醛的电子轰击(El)、甲烷化学电离(CH4 Cl)和氨化学电离(NH3 Cl)质谱。 [图形省略] 离子在 El（70 和 14 eV）下主导总离子电流。在 CH4 Cl 模式中，[(M+ 1)–CH3OH]+ 离子形成基峰，但 2-(二甲氧基甲基)-5-(2-羟乙基)-环戊-3-en-1-基乙酸甲酯、化合物 (V) 除外，它产生 [(M+ 1)–2CH3OH]+ 作为基峰。 NH3 Cl 模式中不存在 [M+ 1]+ 离子，但碎裂模式仍然很复杂。主要的碎裂途径包括簇加合物离子、电荷转移产物和醛（缩醛逆反应的产物）的碎裂。分子离子在电离过程中获得的能量差异导致了这一特征。
The electron impact (El), methane chemical ionisation (CH4 Cl) and ammonia chemical ionisation (NH3 Cl) mass spectra of five acetals have been obtained. The [graphic omitted] ions dominate the total ion current under El (70 and 14 eV). In the CH4 Cl mode, the [(M+ 1)–CH3OH]+ ions form the base peaks, except for methyl 2-(dimethoxymethyl)-5-(2-hydroxyethyl)-cyclopent-3-en-1-ylacetate, compound (V), which yields [(M+ 1)–2CH3OH]+ as the base peak. The [M+ 1]+ ion is absent from the NH3 Cl mode, but the fragmentation patterns are still complicated. The main fragmentation pathways include fragmentation from the cluster adduct ions, from the charge-transfer products and from the aldehyde, a product from the reversed reaction of the acetal. The difference in energy gained by the molecular ions during the ionisation process leads to this feature.