Substituted pyrimido[1. 2-b]pyridazin-2(2H)-ones and isomeric 4(4H)-ones; scope and limitations of a diagnostic fragmentation reaction
✍ Scribed by Gyula Jerkovich; Péter Métyus
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 147 KB
- Volume
- 24
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
New Mass Spectra Substituted Pyrimidojl.2-b]pyridazin-2(2H)-oaes and Isomeric 4(4H)-ones; Scope and Limitations of a Diagnostic Fragmentation Reaction * Molecular ion: percentage of total ion current. ** Fragment ions: percentage of total fragment ion current, i.e. cy-1 I(rn/z).
📜 SIMILAR VOLUMES
## Abstract We report the condensation of substituted 2‐aminopyridines 5 with β‐ketocarboxylic esters in polyphosphoric acid. In this reaction were obtained together with the target compounds, 4__H__‐pyrido[1,2‐__a__]pyrirnidin‐4‐ones 6 also the pyridin‐2‐ones 7. All the compounds 7 were tested for
The absorption spectra and emission spectra of 4-substituted 2H-1-benzo/napthopyran-2-ones 3a-l have been determined in THF and DMSO. The substituent at the 4-position of the 2H-benzo/napthopyran-2-one, establishes a compact conjugation pathway in which the pyran-2-one nucleus can act as an acceptor