Crown ethers of low symmetry. Spiro crown ethers and 16-crown-5 derivatives

…, H Sakamoto, A Yamahira, M Yoshinaga…

Index: Ouchi, Mikio; Inoue, Yoshihisa; Sakamoto, Hidefumi; Yamahira, Atsushi; Yoshinaga, Masanobu; Hakushi, Tadao Journal of Organic Chemistry, 1983 , vol. 48, # 19 p. 3168 - 3173

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Citation Number: 66

Abstract

Spiro crown ethers 3a-c, spiro bis (crom ethers) 5a-e, and the related 16-crown-5 derivatives 6a-d were synthesized and their cation binding abilities were evaluated by study of the extraction of aqueous alkali picrates. Crown ethers carrying 13-crown-4 and 16-crown-5 skeletons showed significant changes in cation selectivity as compared with the corresponding 12-crown-4 and 15-crown-5. Spiro-13-crown-4 3a and spiro-bis [4.4] 5a ...