Polymeric pseudocrown ethers

Warshawsky and coworkers have recently reported the synthesis of a class of compounds which they call polymeric pseudocrown ethers . A chloromethylated polystyrene matrix is used here as in 6.6.2, but instead of adding a crown to the backbone, a strand of ethyleneoxy units is allowed to react at two different positions on the chain, thus forming a crown. Such systems must necessarily be statistical, and the possibility exists for forming interchain bridges as well as intrachain species. Nevertheless, polymers which could be successfully characterized in a variety of ways were formed. A schematic representation of such structures is illustrated below as compound 30. ... 

Polymeric pseudocrown ether networks have been generated in situ by the photopolymerization of poly(ethylene glycol) diacrylate transition metal complexes <00CM633>, and the effect of metal ion templation was evaluated. The 1,6,13,18-tetraoxa[6.6]paracyclophane-3,15-diyne (termed pyxophanes) was prepared from hydroquinone and l,4-dichlorobut-2-yne it forms size-selective 7i-complexes with alkali metal cations <00CC2377>. Dibenzo[ ]crown-m have been used in numerous elegant studies in which they were the needles that were threaded by diverse reagents the resultant... 

Polymeric pseudocrown ether resins, containing azathiacrown and oxacrown ethers in 13- and 19-membered rings, were prepared as shown for the former in Scheme 28 <1997JAPS931>. The polymers adsorbed noble metals well. IR spectra of the polymeric azacrown ethers and photoelectron spectra of the uncomplexed and metal-complexed reagents were reported. 

A. Warshawsky, R. Kalir, A. Deshe, H. Berkovitz, and A. Patchornik (1979), Polymeric pseudocrown ethers. 1. Synthesis and complexation with transition metal anions. J, Amer. Chem. Soc. 101, 4249-4258. 

POLYMERIC PSEUDOCROWN ETHERS SYNTHESIS AND COMPLEXATION WITH TRANSITION METAL ANIONS... 

A new electroactive conductive polymer was synthesized by electrochemical polymerization of (31) in propylene carbonate [62]. A pseudocrown ether structure (32) was expected to occur by the template effect, but the real structure was not clear. The results of the above polymers bearing etheric lateral groups should have practical implications for the design of selective electrode, charge-controllable membrane and drug-release devices. 

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