The 10th Asia-Oceania Mass Spectrometry Conference (AOMSC2025) - organized by the Mass Spectrometry Society of Japan

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Day 1, June 22(Sun.) 

Room P (Maesato East, Foyer, Ocean Wing)

The [M-H]+ Formation of 4-Substituted-1-(methoxymethyl)benzene Derivatives under Positive Fast Atom Bombardment Ionization

(1Mukogawa Women's Univ., 2Osaka Research Institute of Industrial Science and Technology)
oShizuyo Horiyama1, Motohiro Shizuma2

The appearance of the characteristic peak of the hydride-eliminated molecule [M-H]+ under a positive ion mode (positive) fast atom bombardment (FAB) ionization condition and liquid-assisted secondary ion mass spectrometry (LSIMS) conditions is known for some compounds and the mechanism of its formation has been investigated. In this study, we investigated the formation mechanism of the hydride-eliminated molecule [M-H]+ from 4-substituted-1-(methoxymethyl)benzene under a positive FAB ionization condition.
As 4-substituted-1-(methoxymethyl)benzene, 4-methoxy-1-(methoxymethyl)benzene (1), 4-methoxy-1-(methoxymethyl-d2-)benzene (1-d2) and 4-methoxy-1-(methoxymethyl-d3)benzene (1-d3) were selected to clarify the site of hydride elimination was the methylene of the 1-(methoxymethyl) moiety (Fig. 1). To examine the contribution of the 4-substituent to the hydride elimination reaction, the mass spectra of (methoxymethyl)benzene (2) and 4-nitro-1-(methoxymethyl)benzene (3) were used.