N, N'-Dimethyl-N, N'-diphenylguanidine (2a) and the corresponding guanidinium salt (2b) have crystal structures in which two phenyl groups are located face-to-face. Similar (cis, cis) conformations were also observed in various solvents. These structures may be useful as key building blocks to construct water-soluble aromatic layered molecules.
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Tanatani et al. (1996) studied this question.
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