Alkali metal complexes ethylene glycol

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... 

The addition product, C QHgNa, called naphthalenesodium or sodium naphthalene complex, may be regarded as a resonance hybrid. The ether is more than just a solvent that promotes the reaction. Stabihty of the complex depends on the presence of the ether, and sodium can be Hberated by evaporating the ether or by dilution using an indifferent solvent, such as ethyl ether. A number of ether-type solvents are effective in complex preparation, such as methyl ethyl ether, ethylene glycol dimethyl ether, dioxane, and THF. Trimethjlamine also promotes complex formation. This reaction proceeds with all alkali metals. Other aromatic compounds, eg, diphenyl, anthracene, and phenanthrene, also form sodium complexes (16,20). 

Because the oxygen of ether compounds carries a net negative charge,68 a complex was reported to be formed between the oxygen of compounds such as poly(ethylene glycol) and metal ions, especially alkali metal and alkaline earth metal cations, due to the ion-dipole interactions of the positive charge of the... 

TTSBI which is soluble in various polar solvents was used as nucleophilic monomer for several syntheses of multicyclic polyesters [21] and polyethers [22]. With sebacoyl chloride or 1,6-hexanediol bischloroformiate (see Formula 12.7) gelation occurred even the ICM was lowered to 0.02 mol/L. At this ICM asoluble multicycles were obtained, when the ahphatic-aromatic DADs outlined in Formula 12.7 were used as reaction partners and with the m-isomers an ICM of 0.04 was sufihcient. Soluble, multicyclic polyethers were isolated from polycondensations of TTSBI and tosylated di- and tri(ethylene glycol) at an ICM of 0.02 mol/L [19]. These materials possess the expected properties of multicyclic crown ethers (or cryptants) and form complexes with aU alkali metal ions. Attempts to prepare multicyclic aromatic polyethers were less successful [23]. Despite optimization of the reaction conditions nearly quantitative conversions were never achieved regardless, if 4,4-dichlor- or 4,4-diffluorodiphenyl sulfone... 

Although non-ionic surfactants would appear to be unlikely candidates as complexing agents for metal ions, the interaction of some polyoxyethylene glycols with metal ions has recently attracted interest [90,91]. The reaction of non-cyclic polyoxyethylene derivatives with alkali and alkaline earth metals has been studied by means of solvent extraction of their thiocyanates or iodides. Polyoxyethylene dodecyl ethers with more than 7 ethylene oxide units were able to bind potassium ion in the water phase and to transfer the complexed salt to the organic phase the extracting power of Ci2Eg was about one sixth of that of a crown ether [92]. Some results are shown in Fig. 11.13. 

---