Fragmentation mechanism of dimethyl maleate and fumarate by electron impact
作者： Susumu Tajima , Atsushi Ishiguro , Seiji Tobita
DOI: 10.1016/0168-1176(87)83051-3
关键词: Dimethyl maleate 、 Deuterium 、 Stereochemistry 、 Mass spectrum 、 Chemistry 、 Polyatomic ion 、 Electron ionization 、 McLafferty rearrangement 、 Physical chemistry 、 Fragmentation (mass spectrometry) 、 Kinetic isotope effect
摘要: Abstract Fragmentation mechanisms of the geometrical isomers dimethyl maleate(I) and fumarate(II) are investigated by using deuterium labelling mass analyzed ion kinetic energy (MIKE) spectroscopy. The EI spectra unimolecular MIKE molecular ions ( m/z 144) I II substantially different. It is proposed that [M - CH 2 O] + 114) produced a McLafferty rearrangement 85 two processes, [M] +. → CO 3 ] 85) OCH 113) [M-OCH CO] 85). A remarkable intramolecular inverse isotope effect observed in losses COOCH COOCD from metastable labelled fumarate II- d . This result discussed terms hidden hydrogen transfer prior to dissociation.
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