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Ion–molecule reactions of cis- and trans-cyclopropane derivatives with methane, acetone and vinyl acetate under chemical ionization conditions

✍ Scribed by Zhili Li; Shuying Liu; Fengrui Song; Zhiqiang Liu; Yu Zhou

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
127 KB
Volume
12
Category
Article
ISSN
0951-4198

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✦ Synopsis

Ion-molecule reactions of four isomeric cyclopropane derivatives were investigated under chemical ionization(CI) conditions, using methane, acetone and vinyl acetate as reagent gases. The methane positiveion CI mass spectra of each of two isomer pairs 1,2 and 3,4 are identical, and so are the collision-induced dissociation (CID) spectra of the protonated molecules of each of the two isomer pairs. The protonation reactions for the isomer pairs 1,2 and 3,4 occurred on the sites of the carboxyl groups and the R groups, respectively. Differences between isomers 1 and 2 are observed in their acetone (A) positive-ion CI mass spectra and in the CID spectra of their adduct ions ([MHA] ). The adduct ions of compounds 2, 3 and 4 with protonated acetone and with protonated acetone dimer are observed in their CI mass spectra. However, only the adduct ions of compound 1 with protonated acetone appear in its CI mass spectrum. The protonated dimers of each of the four compounds are found in their vinyl acetate positive-ion CI mass spectra, and the CID spectra of these dimers for isomers 1 and 2 can also reflect their stereostructural difference.

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