Abstract
Proton and12C NMR study of molecules related to retinal has been carried out. The characteristic differences in spectral behaviour among 7-trans and 7-cis isomers have been established which would be useful in determining the structure of new isomers and identifying components in a mixture. Through coupling constant measurements and DNMR study it is clearly established that 7-cis isomers of β-ionyl derivatives and in turn 7-cis isomers of retinyl derivatives prefer a non-planar arrangement and this non-planarity brings about resonance destabilisation.
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Ramamurthy, V., Liu, R.S.H. Spectroscopic properties of molecules related to hindered isomers of retinal. Proc. Indian Acad. Sci. (Chem. Sci.) 88, 239–247 (1979). https://doi.org/10.1007/BF02880930
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DOI: https://doi.org/10.1007/BF02880930