Polyether compounds

A second type of soHd ionic conductors based around polyether compounds such as poly(ethylene oxide) [25322-68-3] (PEO) has been discovered (24) and characterized. These materials foUow equations 23—31 as opposed to the electronically conducting polyacetylene [26571-64-2] and polyaniline type materials. The polyethers can complex and stabilize lithium ions in organic media. They also dissolve salts such as LiClO to produce conducting soHd solutions. The use of these materials in rechargeable lithium batteries has been proposed (25). 

In specific applications to phase transfer catalysis, Knbchel and his coworkers compared crown ethers, aminopolyethers, cryptands, octopus molecules ( krakenmole-kiile , see below) and open-chained polyether compounds. They determined yields per unit time for reactions such as that between potassium acetate and benzyl chloride in acetonitrile solution. As expected, the open-chained polyethers were inferior to their cyclic counterparts, although a surprising finding was that certain aminopolyethers were superior to the corresponding crowns. 

Sasaki M (2006) Recent Advances in Total Synthesis of Marine Polycyclic Ethers. 5 149-178 Satake M (2006) Marine Polyether Compounds. 5 21-51 Shan R, see Maiti SN (2006) 2 207-246... 

Polyether Compounds for Oil-Based Well Drilling Fluids... 

A liquid oil, an emulsifier, and a friction modifier, which includes certain polyether compounds, can be added to a drilling fluid consisting of a water-in-oil emulsion formed from a brine [1155]. The friction modifier serves to decrease the coefficient of friction of the well drilling fluid. Decreasing the coefficient of friction lowers the force required to turn the drill bit in the hole. Gravitational forces increase the coefficient of friction in deviated-, horizontal-, and extended-reach wells. 

Murata, M., Isolation and structure of yessotoxin, a novel polyether compound implicated in diarrhetic shellfish poisoning, Tet. Lett., 28, 5869, 1987. 

Source of Purified Ciguatoxin and Other Related Purified Polyether Compounds. Partially = 190 ]ig/kg mice) and highly =... 

An interesting assessment of the EIA is the demonstration that structurally known polyether compounds such as brevetoxin, okadaic... 

Table II. The Concentration of Polyether Compounds Inhibiting 50% of the Reaction between Sheep Anti-CTX...

Brevetoxin B (79) is one of the most representative polyether compounds, which was isolated by Nakanishi, Clardy, and co-workers, from Gymnodynium breve Davis [36]. Nakanishi and co-workers postulated the biosynthetic pathway of 79 as shown in Scheme 7.21, that is, stereoselective oxidation of polyene 80 would give... 

Hamilton, R.S., Lund, G.K., and Hajik, R.M. (1995) Manufacture of polyether compounds having both imine and hydroxyl functionality for solid propellant binder. US Patent 5,414,123 Chem. Abstr., (1995) 123 (4), 87609 k. 

The M(/ -diketonate)2(polyether) compounds are normally white or colorless solids with good solubility in many organic solvents. As a group, they have the lowest melting points and sublimation temperatures, and therefore the best apparent volatilities, of any of the compounds discussed in this review.216 As noted previously, passing nitrogen-containing bases... 

Nagai, H., Satake, M., and Yasumoto, T. 1990. Antimicrobial activities of polyether compounds of dinoflagellate origins. J... 

Takahashi, H., Kusumi, T, Kan, Y., Satake, M., and Yasumoto, T. 1996. Determination of the absolute configuration of yessotoxin, a polyether compound implicated in diarrhetic shellfish poisoning, by NMR spectroscopic method using a chiral anisotropic reagent, methoxy-(2-naphthyl)acetic acid. Tetrahedron Letters 37, 7087-7090. 

Mori, M., Oishi, T, Matsuoka, S., Ujihara, S., Matsumori, N., Murata, M., Satake, M., Oshima, Y, Matsushita, N., and Aimoto, S. 2005. Ladder-shaped polyether compound, desulfated yessotoxin, interacts with membrane-integral alpha-helix peptides. ilioorgA/erfC/jem 13, 5099—5103. 

Recall from Section 3.7B that some cyclic polyethers—compounds with two or more ether linkages—contain cavities that can complex specific-sized cations. For example, 18-crown-6 binds K , whereas 12-crown-4 binds LF. 

We studied the partition equilibria and structures of the ion pair of cationic complex of polyether compounds with picrate ion and reported that the dissociation of ion pair in the organic phase plays an important role for the partition equilibria.In the present paper, the ion-pair formation in 1,2-dichloroethane was studied by using the one of the most simple system of electrolyte, tetraalkylammonium picrate. The effect of the chain length of the alkyl group was studied for the symmetric and asymmetric tetraalkylammonium ions. 

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