Abstract 1, 1‐Bis‐dimethylaminoethylenes with electron attracting substituents on C 2 show rotations around the CC and CN bonds, the rates of which are in most cases measurable by the NMR line shape method. The temperature‐dependent four‐and eight‐site NMR spectra have been analysed and the barriers to rotation around the different bonds have been evaluated by a complete line shape treatment based on the Bloch formalism. Assignment of sites to methyl groups has been made with the aid of aromatic solvent induced shifts and anisotropy effects.
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Wennerbeck et al. (1972) studied this question.
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