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Electron impact mass spectra of new 5-substituted-2-amino-2-oxazolines

✍ Scribed by G. Bourgeois; C. Jarry; J. J. Bose; G. Deleris; E. Pays

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
255 KB
Volume
26
Category
Article
ISSN
1076-5174

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✦ Synopsis

The electron impact mass spectra of fifteen 5-substituted-2-aminc&2-oxazolines classified in two series according to the nature of the substituent are discussed. For the 5-(l-aryl-4-piperazino)methyl compounds the main fragments are derived from the arylpiperazine moiety, whereas for the phenoxymethyl compounds the main ions are derived from the heterocyclic oxazoline ring.

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Table 1. The EI mass spectra, showing peaks of >5% relative abundance (RA), of compounds 1-10, using 70 eV electrons Compound m/z (% RA) 1 315(M, 55) 314(10) 161(10) 160(89) 159(13) 107(12) 106(100) 105(11) 104(9) 91(33) 77(22) 65(15) a 2 345(M, 4) 316(7) 315(19) 314(100) 190(11) 175(7) 172(5) 160(1

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Fragmentation pathways of the title compounds under electron impact were compared to those of their (1aryl)substituted analogs reported earlier. The main fragmentation route of the M Á ions is the sulphamide N-S bond cleavage leading to [M Γ€ ArSO 2 ] ions. No loss of the alkyl substituents from the

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Fragmentation pathways of the title compounds were studied using accurate mass measurements and collision-induced dissociation spectra. Substituents in the ortho position of the aryl group at the pyrimidine ring were found to play a special role in the electron impact (EI) induced fragmentation of t