Structure and reactivity of molecular ions of isomeric pyrrolquinolinones and benzoquinolizinones

✍ Scribed by S. Fontana; O. Curcuruto; P. Traldi; A. Castellin; A. Chilin; P. Rodighiero; A. Guiotto

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 469 KB
• Volume: 27
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210271117

✦ Synopsis

The structure and mass spectrometric behaviour of molecular species of two benm [ @] quinolizin-ii-ones and one pyrrol[ 3,2,1-ij] quinolin-4-one were studied in detail with the aid of mass-analysed ion kinetic energy spectrometry and ion trapping experiments. Whereas in the usual electron impact spectra obtained with a double-focusing instrument clear differences are present among the three isomeric componds, the unimolecular fragmentation processes of the related M+' indicate the occurrence of isomerization processes to give a common structure. Significantly, under ion trap conditions nearly identical electron impact spectra are obtained; such unexpected behaviour was explained by either the presence of the buffer gas or the lower energy deposition in the molecular species. Under isomerization process occurs. occurrence of different ionizing phenomena, leading to fast atom bombardment conditions, an acid-catalysed