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Methylene chloride chemical ionization of fumaric and maleic acids and their esters
Author(s) -
Tu YaPing,
Liu YaQin,
Yang GuanYu
Publication year - 1992
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210270111
Subject(s) - methylene , chloride , chemistry , chemical ionization , adduct , fumaric acid , reagent , protonation , maleic acid , fragmentation (computing) , ion , mass spectrometry , medicinal chemistry , organic chemistry , ionization , inorganic chemistry , chromatography , operating system , computer science , copolymer , polymer
The chemical ionization (CI) mass spectrometry of fumaric and maleic acids and their esters with methylene chloride as reagent gas is described. The introduction of methylene chloride to the CI(CH 4 ) plasma led to the formation of new characteristic ions in addition to the protonation and the subsequent fragmentation, revealing diagnostic information on the configuration of geometrical isomers. The new characteristic ions have been found to arise from the addition of the reactant ion of methylene chloride, [CH 2 Cl] + , to the substrates and, for higher dialkyl esters, from the further McLafferty rearrangement of the adduct ion [M + CH 2 Cl] + .