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• W2034286314 abstract "1-(p-Vinylphenyl)dibenzosuberyl methacrylate (VDBSMA) having two reactive vinyl groups in a molecule was synthesized and polymerized using α,α′-azobis(isobutyronitrile) as a radical initiator and using the complexes of 9-fluorenyllithium with (S)-(+)-1-(2-pyrrolidinylmethyl)pyrrolidine, (−)-sparteine, and (S,S)-(+)-2,3-dimethoxy-1,4-bis(dimethylamino)butane as optically active anionic initiators. The free radical polymerization led to an insoluble material, indicating that both methacrylic and styrenic moieties participated in the polymerization and a cross-linked gel was produced. In contrast, the anionic polymerization proceeded exclusively through the addition reaction of methacrylic moiety leaving the styrenic vinyl group intact leading to soluble polymers. The resulting poly(VDBSMA)s having a polymethacrylate-type main-chain structure were highly isotactic and showed high optical activity and intense circular dichroism (CD) spectra, indicating that the polymers have a single-handed helical conformation. Thus, a single-handed helical polymer having side-chain vinyl groups, which can be chemically modified, was successfully synthesized. The side-chain vinyl group was converted to 2-hydroxyethyl group, 1,2-dihydroxyethyl group, and carboxylic acid group by polymer reaction without seriously deteriorating the single-handed helical conformation of the polymer. In this way, single-handed helical polymers with side-chain protonic groups which would be difficult to be prepared by direct asymmetric anionic polymerization of the corresponding monomers were conveniently synthesized. In addition, radical polymerization of poly(VDBSMA) as a macromonomer afforded an optically active adduct consisting of single-handed helical chains." @default.
• W2034286314 created "2016-06-24" @default.
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• W2034286314 date "2010-06-29" @default.
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• W2034286314 title "A Reactive Helix: Synthesis, Chemical Modification, and Polymerization of an Optically Active Polymethacrylate" @default.
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• W2034286314 doi "https://doi.org/10.1021/ma101057j" @default.
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