Benzoazacrown ethers and dibenzodiazacrown ethers with peripheral chromophore groups
Arylazo derivatives of benzoaza- and dibenzodiazacrown ethers were obtained by diazo coupling of benzoaza- and dibenodiazacrown ethers with 4-nitrobenzenediazonium chloride. A chromophore effect is observed in the reaction of 13-(4-nitrophenylazo)-2,3,5,6,8,9-hexahydro-10H-benzo[k] [1,4,7,10]trioxaazacyclododecene with lithium ions in an aqueous organic medium in the presence of tetramethylammonium hydroxide.