Synthesis and the extractability of aminobenzocrown ether derivatives connected by an azulenequinone: azulene-bis(aminobenzo-15-crown-5) framework as a useful potassium cation capture

摘要

Bis(aminobenzocrown ether)s connecting with azulenequinones (6 -9) were prepared by the nucleophilic substitution reaction of the corresponding dibromo-azulenequinones (5) with 4'-aminobenzo-15-crown-5 or -18-crown-6 and the high extractability of 3,7(5)-bis(aminobenzo-15-crown-5)-azulene-quinones (8) for potassium cation was revealed and explained by a plausible 2/1 sandwich-type complex formation.