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Generation and fragmentation of didehydronaphthalene radical cations under electron impact

✍ Scribed by Sean M. Bromfield; Leonard K. Dyall

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
278 KB
Volume
30
Category
Article
ISSN
1076-5174

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✦ Synopsis

The electron impact mass spectra of disubstituted naphthalenes (chloronitro, acetylnitro, dihromo and dinitro derivatives) and of two naphthalenedicarboxylic anhydrides were studied under high resolution and by means of linked (B/E) scans. They all generate didehydronaphthalene radical cation, C,,H:', in most cases with a very high abundance, so that a convenient route to these interesting species is provided. These isomeric ions were all seen to lose the same fragments, namely C,H,,C2H4,C,H,,C4H,or C2H,+ C,H, . In three instances, mass-analysed ion kinetic energy spectrometric (MIKES) and collisional activation/MIKES experiments were carried out and no differences in fragmentation behaviour were detected. Hence these isomeric C, ,Hb' ions achieve some common structure either before or during the fragmentation.

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