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Electron impact induced fragmentation of pyridyl macrocyclic polyethers (crown ethers)

✍ Scribed by Richard R. Whitney; David A. Jaeger

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
370 KB
Volume
15
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

The mass spectra of pyridyl‐18‐crown‐6 and pyridyl‐15‐crown‐5 were determined. The spectra of five deuterium labeled analogues of pyridyl‐18‐crown‐6 coupled with high resolution data, allowed formulation of fragmentation pathways, which are dominated by several series involving the loss of C~2~H~4~O units.

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Electron Impact Induced Fragmentation of
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Six structurally related crown ethers have been studied by electron impact @I) mass spectrometry. From accurate mass measurements, metastabel ion and mass-analyzed ion kinetic energy (MIKE) spectra, plausible fragmentation pathways were deduced. All compounds showed very abundant molecular ions and

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Electron impact (EI) spectra of polymethylene-bridged carbonylhydrazones of 4'-formylbis(benzo-15crown-5 ether)s, their 18-crown-6 analogs, and their complexes with alkali cations (Na , K , and Cs ) were studied. Evidently, there are three main routes of fragmentation, including two types of McLaffe