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Charge distribution in dicarbonium ions

โœ Scribed by Harold Hart; Ching-Yong Wu; Richard H. Schwendeman; Robert H. Young

Book ID
104213171
Publisher
Elsevier Science
Year
1967
Tongue
French
Weight
154 KB
Volume
8
Category
Article
ISSN
0040-4039

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โœฆ Synopsis

Nmr chemical shlfte in charged species are proportional to tne charge density (1).

Charge distribution in arylcarbonium ione has been probed using this tool (2,3), and it has been shown that chemical shifts of n protona parallel m.o. predictions, whereas ring currents of adjacent aryl groups seriously affect ortho protons (and, to a lesser extent, meta protons). Thus In the triphenylmethyl cation, para protons appear at lowest field, but ortho protons appear at highest field (4).

We wish to report here the first assignment of chemical shifts of protons in dicarbonium ions. Spectra and pK R++ '6 of ions I-III were reported earlier (5). I-III were synthesized with deuterium in the positions shown in Table I. From the nmr spectra of the

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Some time ago (1) we reported on dicarbonium ions of the triarylmethyl type in which the sites of ionization were attached ortho, meta or para on a single benzene ring. We now wish to record results (2) on the spectra and pK R++ '6 of dicarbonium ions in which the ionization sites are separated by t

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