26256-87-1Relevant academic research and scientific papers
Sulfurization of polymers 1. The reaction of polydialkylsiloxanes with elemental sulfur and electrochemical behavior of the products
Trofimov, B. A.,Skotheim, T. A.,Parshina, L. N.,Khil'ko, M. Ya.,Oparina, L. A.,Kovalev, L. P.,Gavrilov, A. B.
, p. 463 - 469 (1999)
The hydrosilylation of vinyl methyl and divinyl ethers of oligoethylene glycols with polyhydridosiloxanes in the presence of chloroplatinic acid is accompanied by side processes, namely, polymerization of vinyl ethers and homodehydrocondensation of polyhydridosiloxanes. The electrical conductivity of ca. 1 M solutions of lithium triflate or bis(trifluoromethylsulfonyl) imide in the resulting hydrosilylation products is ca. 10-5 S cm-1.
Synthesis and characterization of novel alternating fluorinated copolymers bearing oligo(ethylene oxide) side chains
Alaaeddine, Ali,Hess, Andrew,Boschet, Frederic,Allcock, Harry,Ameduri, Bruno
, p. 977 - 986 (2013)
The synthesis and characterization of novel poly(CTFE-g-oligoEO) graft copolymers [chlorotrifluoroethylene (CTFE) and ethylene oxide (EO)] are presented. First, vinyl ether monomers bearing oligo(EO) were prepared by transetherification of ω-hydroxyoligo(EO) with ethyl vinyl ether catalyzed by a palladium complex in 70-84% yields. Two vinyl ethers of different molecular weights (three and 10 EO units) were thus obtained. Then, radical copolymerization of the above vinyl ethers with CTFE led to alternating poly(CTFE-alt-VE) copolymers that bore oligo(OE) side chains in satisfactory yields (65%). These original poly(CTFE-g-oligoEO) graft copolymers were characterized by 1H, 19F, and 13C NMR spectroscopy. Their molecular weights reached 19,000 g mol-1, and their thermal properties were investigated while their glass transition temperatures ranged between -42 and -36 °C. Their thermogravimetric analyses under air showed decomposition temperatures of 270 °C with 10% weight loss (Td,10%). These novel copolymers are of potential interest as polymer electrolytes in lithium ion batteries, showing room temperature conductivities ranging from 4.49 × 10-7 to 1.45 × 10-6 S cm-1 for unplasticized material.
Vinyl polymerization versus [1,3] O to C rearrangement in the ruthenium-catalyzed reactions of vinyl ethers with hydrosilanes
Harada, Nari-Aki,Nishikata, Takashi,Nagashima, Hideo
supporting information; experimental part, p. 3243 - 3252 (2012/06/01)
Two reactions, vinyl polymerization and [1,3] O to C rearrangement of vinyl ethers, are investigated in the ruthenium-catalyzed reaction with hydrosilanes. The reaction pathways are dependent on the substituents of the vinyl ether, in particular, those of the alkoxy group. Primary-, secondary-, and tertiary-alkyl vinyl ethers, ROCHCH2, are polymerized with ease to give the corresponding polymer in good yields. When R is electron-donating benzyl groups, the reaction does not give the polyvinyl ether but results in [1,3] O to C rearrangement to give the corresponding aldehyde, RCH2CHO in moderate to good yields. The rearrangement selectively proceeds when vinyl ethers having α-substituents are used as the starting materials to give the corresponding ketones in high yields. With catalytic amounts of hydrosilanes, the rearrangement gives ketones or aldehydes selectively. In sharp contrast, use of excess amounts of hydrosilanes leads to the rearrangement followed by reduction of the formed carbonyl group to give the corresponding silyl ethers in good yields. Nature of catalytically active species is discussed. Crown Copyright
Nucleophilic addition to acetylenes in superbasic catalytic systems. IX. Anions of oligo(ethylene glycol)s and monomethyl ethers thereof
Parshina,Sokolyanskaya,Nosyreva,Scotheim,Zefirov,Trofimov
, p. 202 - 206 (2007/10/03)
In superbasic system KOH-DMSO increases velocity and selectivity of nucleophilic addition of oligo(ethylene glycol)s and their monometyl ethers to acetylene. Accumulation of ethylene oxide units in the molecule additionally activates it to vinylation process due to formation of crown-like structure which increases the basicity of the medium and nucleophilicity of the reacting anions.
