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13C-nmr of carbonyl compounds 1. Stereodynamic behaviour of acyclic and cyclic dienones

✍ Scribed by Klaus Müllen; Siglinde Bender; Eleni Kotzamani; Hans Schmickler; Bruno Frei; Hans R. Wolf

Publisher
Elsevier Science
Year
1981
Tongue
French
Weight
255 KB
Volume
22
Category
Article
ISSN
0040-4039

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✦ Synopsis

The conformational mobility of a series of conjugated dienones is investigated by low-tempera ture NMR-and IR-spectroscopy and interpreted in terms of substituent effects. The stereochemical characterization of conjugated dienones, subject of various spectroscopic studies ' -4 , has to consider the configurations of the C=C-double bonds and the s-cis / s-trans conformational isomerism within both the enone and diene moieties. While NMR-investigations have only dealt with the (average) fast-exchange spectra of the systems we have succeeded via low-temperature 'H-and 13 C-measurements in slowing down dynamic interconversions and in characterizing separately the structures of the isomers.

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