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For instance, [beta] might be evaluated from the wavenumber of onset of strong absorption in the ultraviolet spectral region: thereby [beta] adopts disparate values for s-transoid and putative s-cisoid isomers of buta-1, 3-diene, despite the electronic structures of these conformational isomers being almost the same.
The spectra reveal a plethora of conformational isomers, differing solely by rotation about the C-C single bonds.