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General aspects of the mass spectra of some benzyloxyalkyl substituted purine and pyrimidine nucleoside analogues; A demonstration of the concept of charge localization

✍ Scribed by W. F. A. Grose; T. A. Eggelte; N. M. M. Nibbering

Publisher: John Wiley and Sons
Year: 1971
Tongue: English
Weight: 294 KB
Volume: 5
Category: Article
ISSN: 1076-5174
DOI: 10.1002/oms.1210050708

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✦ Synopsis

The molecular ions of the title compounds appear to lose a molecule of benzaldehyde or a benzyl radical. The first reaction is followed by the elimination of a second molecule of benzaldehyde, the second reaction by either the expulsion of a molecule of benzaldehyde or a molecule of benzylalcohol. These degradations can be readily explained by assuming charge localization in the purine or pyrimidine part of the molecular ions. For the successive loss of a benzyl radical and of a molecule of benzaldehyde from the molecular ions, however, charge localization at one of the ether oxygen atoms may also be responsible to some extent, as demonstrated by the mass spectrum of 1,3-dibenzyloxy-2ethylpropane.

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Assignment of indirect 13C, 1H couplings

Assignment of indirect 13C, 1H couplings in the 13C NMR spectra of some purine and pyrimidine nucleosides and their analogues by long-range selective 1H decoupling

✍ Jun Uzawa; Masakazu Uramoto 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 330 KB

## Abstract The assignments of the long‐range ^13^C, ^1^H coupling constants in the ^13^C NMR spectra of the base moieties of several purine and pyrimidine nucleosides and their analogues were established by the application of long‐range selective ^1^H decoupling with low‐power ^1^H irradiation. Th