Methylene chloride chemical ionization of fumaric and maleic acids and their esters

✍ Scribed by Ya-Ping Tu; Ya-Qin Liu; Guan-Yu Yang

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 274 KB
• Volume: 27
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210270111

✦ Synopsis

Abstract

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]^+^.