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The Gas-Phase Ion/Molecule Reactions of C3H5X (X = C1, Br, I)

✍ Scribed by Tino Gäumann; Zhiqing Zhu; Marcia C. Kida; José M. Riveros

Publisher
John Wiley and Sons
Year
1990
Tongue
German
Weight
434 KB
Volume
73
Category
Article
ISSN
0018-019X

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✦ Synopsis

The ion/molecule reactions of the molecular ion, the C3H: ion, and the C,H: ion obtained from 3-chloropropene, I-bromopropene, 2-bromopropene, 3-bromopropene, bromocyclopropane, and 3-iodopropene have been studied with their neutral precursor in a Fourier-transform mass spectrometer (FT/ICR). The molecular ions react to yield primarily C,H: except for the ion derived from 1-bromopropene that is unreactive. The kinetics of the 3-bromopropene molecular ion reveals that 18% of these ions must possess a different structure which is unreactive. The fact that C,HT ions obtained from 2-bromopropene are the only ones to undergo proton transfer is taken as evidence that only this parent compound gives rise to 2-propenyl cations by low-energy electron impact. The C,H; ions generated in these systems are shown to be roughly an equal mixture of propargylium ions that react to yield C,HT and unreactive cyclopropenium ions.

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