| Autor: |
Zaretskii, Z. V. I., Kustanovich, Z., Kingston, E. E., Beynon, J. H., Djerassi, Carl, Tökes, L. |
| Zdroj: |
Organic Mass Spectrometry; 1986, Vol. 21 Issue 3, p125-130, 6p |
| Abstrakt: |
The translational energy, T, released during the loss of the angular 18- and 19-methyl groups both from metastable molecular ions and metastable [M H2O]+ and [M 2H2O]+ ions, in C(5)-unsaturated mono-and di-hydroxy steroids, as well as in their 19-nor and deuterated analogues bearing the label in the 19-methyl group, has been measured. It was found that, while the T values for the 19-CH3 loss, following the dehydration of the molecular ions, are increased substantially when compared to those for the same loss from the molecular ions, the T values for the 18-CH3 loss are increased much more moderately. Nevertheless, the amounts of translational energy released in the [M H2O]+˙ 18-CH3˙ and [M 2 H2O]+˙ 18-CH3˙ transitions are still higher than those found for the respective 19-methyl loss, in accordance with the general rule established recently. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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