1996 Volume 44 Issue 5 Pages 1135-1137
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.