- Glyceryl Bisether Sulfates. I: Improved Synthesis
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Sparse literature outlines previous syntheses for glyceryl bisether sulfates, which, while giving rise to the desired molecules, are somewhat cumbersome and suffer from undesired by-product formation.We now report and improved synthesis of the title compounds that results in greater simplicity and reduced by-product formation.An hypothesis is advanced to explain the by-product formation. KEY WORDS: Centrally located hydrophile, epichlorohydrin, glyceryl bisether sulfate, synthesis.
- Condon, Brian D.
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- FLUORINE-CONTAINING COMPOUND AND FLUORINE-CONTAINING POLYMER
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The present invention is to provide a novel fluorinated compound which can produce a fluorinated polymer which has high transparency, good heat resistance and adequate flexibility, and a fluorinated polymer containing repeating units based on the fluorinated compound. The present invention relates to a fluorinated compound represented by the formula (1): wherein QF is -CF2-, -CF2CF2-, -CF2CF2CF2-, -CF(CF3)CF2-, -CF2CF(CF3)- or -CF2CF2CF2CF2-, RF is -CF3, -CF2CF3, -CF2CF2CF3, -CF(CF3)2, -CF2CF2CF2CF3, -CF2CF(CF3)2, -CF(CF3)CF2CF3, -(CF2)4CF3 or -(CF2)5CF3, and n is an integer of from 1 to 4, and a fluorinated polymer containing repeating units based on the fluorinated compound.
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Page/Page column 15-16
(2009/12/23)
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- Liquid-Liquid-Extraction of Metal Ions with Lariat Ethers
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Lariat ethers of various ring size and substitution are synthesized and characterized by physical data and chemical analysis.The extraction behaviour of the crown compounds towards Na+, K+, Cs+ and Ag+ in a picric acid solution has been investigated.The extraction constants for 1:1 and 1:2 complexes are determined using the equilibrium distribution data.The results show that the flexible side chain in the investigated compounds has in no case a positive effect on the metal picrate extraction.
- Gloe, K.,Muehl, P.,Beger, J.,Poeschmann, C.,Petrich, M.,Beyer, L.
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p. 413 - 421
(2007/10/02)
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- Crown Cation Complex Effects. 20. Syntheses and Cation Binding Properties of Carbon-Pivot Lariat Ethers
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In an effort devise synthetic cation binders that will mimic the behavior of naturally occuring ionophores such as valinomycin, we have prepared approximately 30 macrocyclic (crown) polyethers bearing flexible side chains attached to the macro ring at carbon.In many of these "carbon-pivot" compounds, the side chain contains one or more neutral donor groups that, if in a suitable geometrical arrangement, may provide additional solvation to the macro-ring-bound cation.Although such donors often enhanced the cation binding ability, overall, the increases in stability constants were modest.The physical resemblance and concept of "roping and tying" the cation suggest the name "lariat ethers".Syntheses of these molecules and binding by them of Na+ and K+ cations are reported and conclusions drawn about the structural requirements and cation binding efficacy of these materials.
- Dishong, Dennis M.,Diamond, Craig J.,Cinoman, Michael I.,Gokel, Geoge W.
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p. 586 - 593
(2007/10/02)
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