Change of the favored routes of EI MS fragmentation when proceeding from N1, N1??dimethyl??N2??arylformamidines to 1, 1, 3, 3??tetraalkyl??2??arylguanidines: …

ED Raczyńska, M Makowski, JF Gal…

Index: Raczynska, Ewa D.; Makowski, Mariusz; Gal, Jean-Francois; Maria, Pierre-Charles Journal of Mass Spectrometry, 2010 , vol. 45, # 7 p. 762 - 771

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Abstract

Abstract Although series of N 1, N 1-dimethyl-N 2-arylformamidines and of 1, 1, 3, 3- tetraalkyl-2-arylguanidines are structurally analogous and similar electron-ionization mass spectral fragmentation may be expected, they display important differences in the favored routes of fragmentation and consequently in substituent effects on ion abundances. In the case of formamidines, the cyclization-elimination process (initiated by nucleophilic attack ...