Mass spectra of some 1-(6′-substituted-4′-methyl-2′-quinolyl)-3-methylpyrazol-5-ols and their 4-substituted analogues

✍ Scribed by Shiv P. Singh; Radhe K. Vaid; Om Prakash

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 255 KB
• Volume: 22
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210220407

✦ Synopsis

Electron impact induced fragmentation of some l-(6'-substituted-4'-methyl-2'-quinolyl)hylpyrazol-5-ols follows a route where the pyrazole moiety is preferentially cleaved with successive losses of two moieties of 41 u. High-resolution measurements have established that the first loss is due to the C2H0 moiety, which necessitates an intramolecular hydrogen transfer followed by ring fission. The resultant ion loses CH3CN in a subsequent step. The origin of many fragment ions was traced with the use of B / E linked-scan spectra.