๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Electron Impact Mass Spectra of Substituted 1-Aryl-2-arylsulphonylamino-1,4,5,6-tetrahydropyrimidines

โœ Scribed by Vladimir Ovcharenko; Elzbieta Szacon; Tadeusz Tkaczynski; Dariusz Matosiuk; Kalevi Pihlaja

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
151 KB
Volume
11
Category
Article
ISSN
0951-4198

No coin nor oath required. For personal study only.

โœฆ Synopsis

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 these structures. The fragmentation pathways involving various pyrimidine ring cleavages are compared to those of the analogous five-membered heterocycles, 1-aryl-2-arylsulphonylamino-2-imidazolines. Discussion of the CID spectra is focused on the dissociation channels characteristic of the differently substituted cyclic arylguanidium ions [M-SO 2 Ar] + which give rise to the base peaks in the EI spectra of the pyrimidine derivatives studied.

๐Ÿ“œ SIMILAR VOLUMES

Electron-impact mass spectra of substitu
Electron-impact mass spectra of substituted 1-alkyl-2-arylsulphonylamino-1,4,5,6-tetrahydropyrimidines
โœ Vladimir Ovcharenko; Elzbieta Szacon; Tadeusz Tkaczynski; Dariusz Matosiuk; Kale ๐Ÿ“‚ Article ๐Ÿ“… 1998 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 88 KB ๐Ÿ‘ 1 views

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 ร ions is the sulphamide N-S bond cleavage leading to [M ร€ ArSO 2 ] ions. No loss of the alkyl substituents from the

Electron impact mass spectra of substitu
Electron impact mass spectra of substituted 1-aryl-2-arylsulphonylamino-ฮด2-imidzazolines
โœ Vladimir Ovcharenko; Marzena Rzadkowska; Tadeusz Tkaczynski; Dariusz Matosiuk; K ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 121 KB

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