Abstract
m-Calix[3]amide is a new family of cyclic oligomer, which is easily synthesized from alkylaminobenzoic acids by the self-condensation reaction, owing to the cis preference of N-alkylbenzanilide unit. m-Calix[3]amide is known to have two conformers in solution. The syn conformer has three benzene rings in the same orientation relative to the amide bond, and the anti conformer has one benzene ring turning in other direction. Because m-calix[3]amide preferentially adopts syn conformation, the appended substituents can be expected to have intimate interaction. We have already investigated the condensation reaction of 3-alkylaminobenzoic acid esters having oligothiophene at the 5-position and the optical properties of cyclic oligomers. We herein synthesized two m-calix[3]amides having pyrene as the chromophore at the meta-position and studied optical properties.
