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13C NMR and ESR spectroscopic investigations on tert-butyl-substituted cyclopentadienones

✍ Scribed by Hans-Otto Kalinowski; Lothar H. Franz; Günther Maier

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
383 KB
Volume
17
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^13^C NMR spectra of 11 di‐, tri‐ and tetra‐tert‐butyl‐substituted cyclopentadienones are discussed with respect to charge distribution and substituent effects. The chemical shifts of the unsubstituted cyclopentadienone, calculated from substituent increments, are in good agreement with published CNDO calculations and can be rationalized by the inductive effect of the carbonyl group. In addition, the ESR signals shown by some of the cyclopentadienones are described, and possible reasons for their appearance are discussed.

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