Crown Ethers Derived from 2,7-Dihydroxyacridine and 2,7-Dihydroxyacridan-9-one
摘要:
We report the synthesis of nine acridine crown ethers 11a, 11b, 12a, 12b, 13a, 13b, 14b, 15b, and 16b having one or two acridine rings linked by poly(ethylene glycol) chains. Their H-1 and C-13 NMR spectra have been analyzed and the chemical shifts related to conformational aspects of the chain and to the tautomerism of the acridan-9-one ring. The transport rates have been determined for compounds 11b and 12b against a large variety of ions. While compound 11b is devoid of complexing properties, compound 12b transports Fe2+, Cu+, and Ag+ but not alkali-metal cations.