F Divinyl ether

Problem 14.48 Prepare the following ethers starting with benzene, toluene, phenol (C6H5OH), cyclohexanol, any aliphatic compound ofthree C s or less and any solvent or inorganic reagent (a) dibenzyl ether, (b) di-n-buty l ether, (c) ethyl isopropyl ether, (d) cyclohexyl methyl ether, (e)p-nitrophcnyl ethyl ether, (f) divinyl ether, (g) diphenyl ether. ... 

Oxybis(Av V-dimethylacetamidetriphenylstibonium) perchlorate, 3905 [l,l -Oxybis[ethane]]tris(trimethyl silyl)aluminium, see Tris(trimethylsilyl)aluminium etherate, 3614 f l,l -Oxybisethene, see Divinyl ether, 1516 2,2 -Oxybis(ethyl nitrate), 1594 f Oxybismethane, see Dimethyl ether, 0915... 

P. Caliceti, O. Schiavon, T. Hirano, S. Ohashi, and F. M. Veronese, Modification of physico-chemical and biopharmaceutical properties of superoxide dismutase by conjugation to the co-polymer of divinyl ether and maleic anhydride, J. Contr. Rel. 39 27-34 (1996). 

Molecular Mechanics Treatment of Halogenated Dibenzo-f>-dioxins and Dibenzofurans MM2 Parameters for Aromatic Halides, Divinyl Ethers, and Related Compounds. ... 

Finally, our studies show all divinyl ether-maleic anhydride copolymers examined to date to be a mixture of the 5-membered and 6-membered bicyclic structures. The primary evidence for this, of course, is the presence of peak B at ca. 35 ppm which is assigned to the methylene carbon on a tetrahydropyran ring. Major features of the spectrum can be readily explained based on the available data present by both us and Professor Kunitake. However, still in question is the meaning of the fine structure contained particularly in peaks D, E, and F with respect to the relative stereochemistry of the copolymer as produced. 

DIVINYL ETHER (109-93-3) Forms explosive mixture with air (flash point <—22°F/< —30°C). Forms peroxides when exposed to air or oxygen may polymerize explosively with evolution of acetylene gas. Store away from oxidizers, heat, and sunlight. 

VOL Volkova, I.F., Gorshkova, M.Yu., Izumrudov, V.A., and Stotskaya, L.L., Interaction of a polycation with divinyl ether-maleic anhydride copolymer in aqueous solutions (Russ.), Vysokomol. Soedin., Ser. A, 46, 1388, 2004. 

IZU Izummdov, V.A., Gorshkova, M.Yu., and Volkova, I.F., Controlled phase separations in solutions of soluble polyelectrolyte complex of DIVEMA (copolymer of divinyl ether and maleic anhydride), Eur. Polym. J., 41, 1251,2005. 

Poly(divinyl ether-o/f-maleic anhydride) poly(A -ethyl-4-vinylpyridinium) bromide and water 2004VOL... 

T. Hirano, T. Todoroki, R. Morita, S. Kato, Y. Ito, K. H. Kim, P. G. Shukla, F. Veronese, H. Maeda and S. Ohashi, Antiinflammatory effect of the conjugate of superoxide dismutase with the copolymer of divinyl ether and maleic anhydride against rat re-expansion pulmonary edema,/. Control. Release, 48,131-139 (1997). 

Antonov, V.N., I.P. Azerbaev, M.F. Shostakovsky et al. 1996. Method for preparation of diethylene glycol divinyl ether. USSR Author s Certificate 180,579. 

Difunctional Initiators The methodology for preparation of hydrocarbon-soluble dilithium initiators is generally based on the reaction of an aromatic divinyl precursor with two mol of butyllithium. Unfortunately, because of the tendency of organolithium chain ends in hydrocarbon solution to associate and form electron-deficient dimeric, tetrameric, or hexameric aggregates, most attempts to prepare dilithium initiators in hydrocarbon media have generally resulted in the formation of insoluble three-dimensionally associated species [70]. The reaction of meffl-diisoprenylbenzene with 2 mol of f-butyllithium in the presence of 1 equivalent of triethylamine in cyclohexane at -20 °C has been reported to form pure diadduct without oligomerization. Equation 7.11 [71]. This initiator in the presence of 5 vol% of diethyl ether for the butadiene block has been used to prepare well-defined poly(metliyl methacrylate)- -polybutadiene-fe -poly(methyl methacrylate). 

Poly(vinyl alcohol) is very high in head-to-tail structures, based on NMR data. It shows the presence of only a small amount of adjacent hydroxyl groups. The polymer prepared from amorphous poly(vinyl acetate) is crystalline, because the relatively small size of the hydroxyl groups permits the chains to line-up into crystalline domains. Synthesis of isotactic poly(vinyl alcohol) was reported from isotactic poly(vinyl ethers) like poly(benzyl vinyl ether), TOly(f-butyl vinyl ether), poly(trimethylsilyl vinyl ether), and some divinyl compounds. ... 

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