Rotational barriers of the dimethylamino group in different enamino aldehydes and ketones have been applied for evaluation of their conformation. It has been maintained that repulsion between bulky substituents causes twisting of the molecule rather than planar deformations. Arguments for and against these alternative concepts based on the analysis of JHH and J(13CH) coupling constants in different fragments of the molecule have been discussed.
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Dąbrowski et al. (1972) studied this question.
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