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Collisionally activated dissociation of 2,4,6-triphenylpyridinium cations

✍ Scribed by Alan R. Katritzky; N. Malhotra; Zofia Dega-Szafran; G. Paul Savage; John R. Eyler; Clifford H. Watson

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
443 KB
Volume
27
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

Thresholds for the appearance of fragment ions allowed the estimation of threshold fragmentation energies (TFE) for the collisionally activated dissociation (CAD) in the gas phase of laser‐desorbed pyridine‐ring substituted N‐benzylpyridinium cations to form pyridine and a carbocation. p‐Methylbenzylpyridinium cation underwent an alternative CAD into pyridinium cation and the p‐quinodimethane. The TFE are discussed in comparison with the energy differences (ΔΔH~f~ = ΔH~f~(Py) + ΔH~f~(R^+^) − ΔH~f~(Py ^+^R) calculated by the AM1 method to provide strong evidence for benzyl to tropylium cation rearrangement in an ion‐molecule pair.

📜 SIMILAR VOLUMES

Collisionally activated dissociation of
Collisionally activated dissociation of some pyridinium cations: Novel fragmentation pathways
✍ Alan R. Katritzky; Clifford H. Watson; Zofia Dega-Szafran; John R. Eyler 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 359 KB

Three novel collisionally induced dissociation pathways, additional to the usual formation of pyridine or pyridinium cation, are described for laser-desorbed N-substituted pyridinium cations. Particularly prevalent is the formation of an ion of m/z 94, corresponding to [PyCH,]'. Doubly charged pyrid