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Fast‐atom Bombardment Mass Spectrometry of New Polydentate Schiff Bases. 5. The Case of Bis‐aldimines Containing Oxamide Groups
Author(s) -
Tomasin Patrizia,
Tamburini Sergio,
Vigato Pietro Alessandro,
D 'Alpaos Martina,
Traldi Pietro
Publication year - 1997
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(199703)11:5<494::aid-rcm861>3.0.co;2-g
Subject(s) - chemistry , oxamide , fast atom bombardment , mass spectrometry , aldimine , protonation , fragmentation (computing) , molecule , schiff base , polymer chemistry , medicinal chemistry , organic chemistry , ion , chromatography , computer science , operating system , catalysis
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‐4‐chlorophenol 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. © 1997 John Wiley & Sons, Ltd.