tetraalkyloxy ortho‐terphenyl units in dibenzo[18]crown‐6 ethers 1 a–f were readily converted into the flat tetraalkyloxytriphenylene systems 2 a–f by oxidative cyclization with FeCl3 in nitromethane. Reactions of the latter with potassium salts gave complexes KX⋅2, which displayed mesomorphic properties. The aromatization increased both the clearing and melting points; the mesophase stabilities, however, were
Dibenzo[18]crown‐6 derivatives 1 with two lateral tetraalkyloxy o‐terphenyl units were prepared and converted to the corresponding complexes KX⋅1 (X=halide, BF4, PF6, SCN) and NH4PF6⋅1. Complexation was probed by MALDI‐TOF spectrometry and NMR spectroscopy. Downfield shifts of 1H NMR signals for complexes with soft anions Br, I, SCN, and PF6 indicated the presence of tight ion pairs, whereas complexes