Dibenzotetraaza Crown Ethers: A New Family of Crown Ethers Based on <i>o</i>-Phenylenediamine
作者:Sven H. Hausner、Cynthia A. F. Striley、Jeanette A. Krause-Bauer、Hans Zimmer
DOI:10.1021/jo050281z
日期:2005.7.1
benzimidizoles were used to produce DBTA crownethers with modified substituents and ether bridges, as well as benzimidazolidine crownethers. The synthetic approach presented here proved to be a convenient route to a new family of crownethers with overall yields of up to 48% based on the benzimidazole. Yields for the ring-closing step were generally high, ranging from 51% to 94%, without the need for high-dilution
A series of 16- and 18-membered azo- and azoxythiacrown ethers have been synthesized by reductive macrocyclization of the respective bis(nitrophenoxy)oxaalkanes. The aromatic residues located in the polyether region of the molecule were introduced to macrocyclic skeletons and their affinities toward different groups of metal cations in ion-selective electrodes were described. X-ray structures for one dinitropodand and one azoxybenzothiacrown exhibiting strong pi-pi and pi-H interactions have been found. (C) 2013 Elsevier Ltd. All rights reserved.
NHC macrometallocycles of mercury(<scp>ii</scp>) and silver(<scp>i</scp>): synthesis, structural studies and recognition of Hg(<scp>ii</scp>) complex 4 for silver ion
bis-imidazolium) salts, and their seven N-heterocyclic carbene mercury(II) and silver(I) complexes 2–8, as well as one anionic complex 1 have been synthesized and characterized. In complex 1, two benzimidazole rings point in opposite directions, and π–π interactions between these two benzimidazole rings are observed. In complex 2, two 13-membered macrometallocycles are linked together by one bridging chlorine