Mass spectrometric and pyrolytic behavior of some arylsubstituted isoxazolines

✍ Scribed by Dallakian, P.; Benoni, H.; Schäfer, M.; Budzikiewicz, H.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 318 KB
• Volume: 33
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/(sici)1096-9888(199804)33:4<346::aid-jms641>3.0.co;2-d

✦ Synopsis

The synthesis and mass spectrometric (MS) and pyrolytic behavior of three 3,5-aryl-substituted isoxazolinyl acetophenones, 2-

Compound I and the mixture of the isomeric compounds II and III were prepared by the reaction of 2,4,6-arylpyrylium salts with hydroxylamine. The substances were investigated using electron ionization, positive chemical ionization with methane and fast atom bombardment. The isomeric compounds II and III were separated by gas chromatography (GC)/mass spectrometry. MS/MS and high-resolution MS were used to establish the fragmentation mechanisms. The thermal decomposition products obtained by o †-line pyrolysis/GC/MS of I-III were compared with the MS fragments. The results of the investigation will facilitate theÕ detection and identiÐcation of 3,5-aryl-substituted isoxazolinyl acetophenones in plant extracts.