Selective Cyclic Trimerization of 4-(Alkylamino)benzoic Acid Dimer Phenyl Esters

摘要

Treatment of 4-(alkylamino)benzoic acid dimer phenyl esters with a base,under conditions where monomeric 4-(alkyl-amino)benzoic acid phenyl esters polymerize to give well-defined aromatic polyamides,affords not polymers,but cyclic trimers in good yield.