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Treatment of furfuraldehyde with 2 mol of aniline yields a colourless product which, from its spectral properties and those of its products of hydrogenation, has been shown to possess the structure 2,4-dianilinocyclopent-2-enone. A number of other simple aromatic amines have been shown to form products of similar structure.
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Lewis et al. (1970) studied this question.
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