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NMR isotope shifts as a probe of a rapid nondegenerate equilibrium in 2-aryl-3-methyl-2-butyl cations

โœ Scribed by David A. Forsyth; Yi Pan


Book ID
104233278
Publisher
Elsevier Science
Year
1985
Tongue
French
Weight
240 KB
Volume
26
Category
Article
ISSN
0040-4039

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โœฆ Synopsis


Equilibrium NMR isotope shifts can be detected for nondegenerate equilibria by comparison with intrinsic shifts in static model compounds. Such equilibrium shifts are smaller than in similar nondegenerate equilibria.


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In FSOsH/SO&lF at -50 to -100' the nonamethylbicyclo[3.2.1] octadien-2-yl cation 1 undergoes an nmr-observable reversible exchange process which equilibrates methyls 2,3,4,6 and 7 and methyls 8 and 9, but leaves the bridgehead methyls (1 and 5) unique.l CIRCUMAMBULATION 3 This observation was ration