The behaviour of stereoisomeric ions in the gas phase: 2—Negative and positive chemical ionization of cyclohexanehexacarboxylic methyl esters
✍ Scribed by Guido Audisio; Maria Grassi; Piero Traldi; Sergio Daolio
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 299 KB
- Volume
- 20
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
The positive ion chemical ionization (CI (isobutane)), negative ion chemical ionization (NICI) electron attachment (CH,,, He) and NICI (OH-) spectra of the title compounds have been studied in detail with the aid of deuterium-labelled derivatives. me obtained results show that under CI conditions the stereospecificity is retained. Interesting correlations with the condensed phase epimerization yields are emphasized.
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## The isobutane chemical ionization (CI) mass spectra of cis-and trans-1-butyl-3-and -4-dimethylaminocyclohexanols and of their methyl ethers exhibit abundant [MH -H 2 O] Y and [MH -MeOH] Y ions respectively. On the other hand, only the MH Y ions of the cis-isomers exhibit significant [MH -H 2 O]
The N, negative ion chemical ionization (NICI) mass spectra of aniline, aminonaphthalenes, aminobiphenyls and aminoanthracenes show an unexpected addition appearing at [ M + 11 1 -'. This addition is also observed in the N, positive chemical ionization (PCI) mass spectra. An ion at IM -151-is found