The substituted benzylideneanilines 2–7 and the respective 3H‐indoles 9–14 have been synthesized. A comparison of their electronic absorption spectra shows it is likely that 4‐nitrobenzylidene‐4′,‐dimethylaminoaniline (6) has a planar conformation.
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Skrabal et al. (1975) studied this question.
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