Fast-atom Bombardment Mass Spectrometry of New Polydentate Schiff Bases. 5. The Case of Bis-aldimines Containing Oxamide Groups

✍ Scribed by Patrizia Tomasin; Sergio Tamburini; Pietro Alessandro Vigato; Martina D 'Alpaos; Pietro Traldi

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 131 KB
• Volume: 11
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(199703)11:5<494::aid-rcm861>3.0.co;2-g

✦ Synopsis

Four macrocyclic tetraimine Schiff bases containing oxamidic groups were synthesized by [2 + 2] condensation of N,N'-bis(2-aminoethyl)oxamide or N,N'-bis(2-amino-1,1-dimethylethyl)oxamide with 2,6-diformyl-4chlorophenol or 2,6-diformyl-4-methylphenol and characterized by elemental analyses and IR and NMR spectrometry; their [2 + 2] cyclic nature was inferred (especially) by fast-atom bombardment (FAB) mass spectrometry. The FAB-induced fragmentation patterns of the protonated molecules, investigated with the aid of metastable ion studies, evidence characteristic behaviours related to the presence of oxamidic groups or of 1,1-dimethylethyl species.