Ionization and appearance potentials in organic chemistry. I—energetic aspects of the mass spectra of stereoisomeric 4-substituted N-alkyl-2-methyldecahydroquinol-4-ols
✍ Scribed by V. G. Zaikin; N. S. Wulfson
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 457 KB
- Volume
- 13
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
The ionization potentials for the stereoisomers of trans-fused 1,Z-dimethyl-and l-ethyl-Z-methyl-4-Rdecahydroquinol-4-01s ( R = m C H , CH=CH2 or C2&) and the appearance potentials for the [M-CH,]+ and [M-C,H,]+ ions (loss of 2-CH, and 4-c& group potential, respectively) were measured by using the electron impact method. The ionization and appearance potential for [M-CH,]+ are always lower €or the isomers with the axial 2-CH, goup. For the C-2 epimers, the difierence between the appearance potentials for the [M-CH,]+ ion values is likely to be equal to the enthalpy differences between the ground states of the epimers and the dissociation energy differences between the axial and equatorial C2-CH, bonds. The appearance potentials for [M-C2HS]+ for the C-4 epimers possessing the 4-C2H5 group were very similar. At the same time, the appearance potentials for the [M-CH,]+ ions were lower for less stable epimers which had an axial 4-GHs group.