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13C and 1H NMR spectral studies of some piperidin-4-one oximes

✍ Scribed by K. Pandiarajan; R. T. Sabapathy Mohan; Misbah Ul Hasan

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
583 KB
Volume
24
Category
Article
ISSN
0749-1581

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✦ Synopsis

C NMR spectra have been recorded for eleven piperidin-4-one oximes and for seven of them 'H NMR spectra have been recorded at 270 MHz. The effect of oxhation on the N M R chemical shitts is discussed.

The conformations of the oximes are also discussed, based on the observed chemical shifts. Although several oximes appear to adopt a chair conformation, in the same manner as the corresponding ketones, the oximes of 3,5-dimethyl-2,6-diarylpiperidin-4-ones with cis-methyl groups seem to adopt an asymmetric non-chair conformation. Analysis of the chemical shifts of cis-2,6-dimethylcycloltexanone oxime suggests that this compound also exists in a non-chair conformation, and not in a chair conformation with two axial methyl groups as suggested previously.

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