Mass Spectral Studies on Pyrazaboles
| Autor: | C. E. May, K. Niedenzu, S. Trofimenko |
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| Rok vydání: | 1976 |
| Předmět: | |
| Zdroj: | Zeitschrift für Naturforschung B. 31:1662-1666 |
| ISSN: | 1865-7117 0932-0776 |
| DOI: | 10.1515/znb-1976-1220 |
| Popis: | The mass spectra of several pyrazaboles of type 1 (R = H) have been studied. The data illustrate that electron impact causes three major fragmentation patterns for the species. Symmetrical cleavage of the pyrazabole followed by further breakdown is common to all compounds. In addition, those pyrazaboles containing H or CH3 at the C atoms of the pyrazole rings undergo an electron impact-induced rearrangement which appears to result in the formation of a species containing a B2N3 ring as a structural entity; subsequent breakdown leads to a B2N2 ring system. The mass spectra of halo- or pseudohalo-substituted pyrazaboles evidence the ready loss of hydrogen halide as a predominant feature; no rearrangement ions are observed. |
| Databáze: | OpenAIRE |
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