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Note | Special issue | Vol 67, No. 1, 2006, pp.437-442
Published online, 13th September, 2005
DOI: 10.3987/COM-05-S(T)66
Synthesis and Complexation Properties of (Tropon-2-yl)monoaza-18-crown-6 Ethers

Zhegang Huang, Xiaopeng Zhang, Zhiqi Cong, Bingzhu Yin,* and Kimiaki Imafuku*

*Department of Chemistry, Faculty of Science, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555, Japan

Abstract

Four (tropon-2-yl)monoaza-18-crown-6 ethers (3a-d) were prepared by the reactions of 2-methoxytropones (1a-d) with monoaza-18-crown-6 (2) in moderate yields. The UV-VIS spectra of these monoazacrown ethers (3a-d) were dramatically changed by adding metal salts. The complexations with moderately hard cations (Ba2+ and Pb2+) were more effectively occurred than those with hard cations (Ca2+, Na+, K+, and Cs+) and with soft cations (Hg2+ and Cd2+).