Abstract

European Journal of Mass Spectrometry
Volume 13 Issue 3, Pages 199–205 (2007)
doi: 10.1255/ejms.877

Characterization of isomeric 1,2,4-oxadiazolyl-N- methylpyridinium salts by electrospray ionization tandem mass spectrometry

Giuseppe Avellone,^a David Bongiorno,^a Silvestre Buscemi,^b Leopoldo Ceraulo,^a,* Serena Indelicato,^a Andrea Pace,^b Ivana Pibiri^b and Nicolò Vivona^b
aDipartimento di Chimica e Tecnologie Farmaceutiche, Università degli Studi di Palermo, via Archirafi n.32 90123 Palermo, Italy. E-mail: lceraulo@unipa.it
^bDipartimento di Chimica Organica “E. Paternò”, Università degli di Studi Palermo, Viale delle Scienze Parco d’Orleans II, Ed. 17, 90128 Palermo, Italy

The mass spectrometry behavior of 1,2,4-oxadiazolyl-N-methylpyridinium salts has been investigated. These substances are of current interest as perspective ionic liquids, compounds used as green solvents for synthesis, and for their catalytic properties. The studies have been developed through ESI-MS/MS experiments. The obtained results demonstrate that a readily distinction between the two isomeric classes, 3-N-methylpyridinium- and 5-N-methylpyridinium-1,2,4-oxadiazoles, is possible through ESI-MS/MS experiments. A deeper investigation on the principal fragmentation pathways of characteristic ions has been also developed.

Keywords: ESI-MS/MS, 1,2,4-oxadiazolyl-N-methylpyridinium salts, ionic liquids

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