Fig. 6

Excerpt of the 3-methylbutyronitrile spectrum. In red: transitions of 3-methyl-anti-butyronitrile. In blue: transitions of 3-methyl-gauche-butyronitrile. Among others, these transitions are used to determine the energy difference between the two conformers of 3-methylbutyronitrile (see also Table 4). The results show that the energy difference is negligible.
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