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Mass spectrometric fragmentation of 1-alkyl-5-bromo-4-hydroxypyridazin-6-ones under electron ionization conditions

✍ Scribed by Un Chul Lee; Won Lee; Yun Je Kim; Song Ja Park; Joo Wha Chung; Su Dong Cho; Yong Jin Yoon

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 169 KB
Volume: 12
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19981015)12:19<1297::aid-rcm326>3.0.co;2-9

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✦ Synopsis

The mass spectral fragmentation pathways of 1-alkyl-5-bromo-4-hydroxypyridazin-6-ones were studied under electron ionization by means of low resolution, high resolution and metastable ion analysis techniques. The principal fragmentation pathways of these compounds involved various skeletal rearrangements that involve transfer of hydrogen from the alkyl group to the carbonyl oxygen and to the N(1) and N(2) atoms.

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Benzylic cleavage and McLafferty rearrangement under electron ionization conditions in the fragmentation of 5,6-dialkyl-2,4-diarylpyrimidines

✍ R. Martínez Alvarez; A. Herrera Fernández; M. Chioua; P. Ramiro Pérez; N. Villal 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 138 KB 👁 2 views

Several 5,6-dialkyl-2,4-diarylpyrimidines were prepared and their electron ionization (EI) mass spectra reported. The benzylic cleavage takes place easily together with an important McLafferty rearrangement. The involvement of the nitrogen atom appears to be important in the fragmentation of 5-methy