Yl. Chu et al., MOLECULAR MODELING AND NMR SPECTROSCOPIC EXAMINATION OF (E)-CYCLODEC-5-ENONE AND ITS 2- AND 10-METHYL ANALOGS, Magnetic resonance in chemistry, 31(10), 1993, pp. 937-943
The H-1 and C-13 NMR spectra of (E)-cyclodec-5-enone and its 2- and 10
-methyl analogs were determined. The H-1 NMR spectrum of the former wa
s determined over the temperature range -60 to 20-degrees-C. Informati
on from the 2-D INADEQUATE spectrum of the parent compound was combine
d with that derived from the homonuclear and heteronuclear correlation
spectra to assign the olefinic proton at C-6. In all three proton spe
ctra, this was the only set of resonances sufficiently well defined to
allow conformational information to be deduced. Molecular modeling by
molecular mechanics, semi-empirical and ab initio molecular orbital m
ethods were used to predict conformational preferences. These results
were then compared with the NMR data.