Abstract
AbstractLow energy collision induced dissociation (CID) spectra were measured by a triple stage quadrupole mass spectrometer for the [MH]+ ions of diethyl and dimethyl esters of maleic, fumaric, citraconic and mesaconic acids. A very high degree of stereospecificity was observed for the geometrically isomeric diethyl esters. The cis esters give rise to very abundant [MHEtOH]+ and [MHEtOHC2H4]+ ions, while the trans isomers exhibit very abundant [MHC2H4]+ and [MH2 C2H4]+ ions. The highly stereospecific processes indicate that the double bond configuration is retained in the protonated species under the conditions of the experiment.
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