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- W2022794196 abstract "25.0 MHz 13C- and 100 MHz 1H NMR investigations were carried out on living chain ends of oligomeric 2-phenyl-1,3-butadienyllithium (oligomeric 2PBLi) in order to reveal the anionic polymerization mechanism. The propagating species of 2PB in the anionic polymerization is considered to be the 1,4 anion. Lithiated 3-phenyl-1-butene (3P1B) was employed as a model anion of the propagating anion of 2PB. A negative charge of the chain end delocalizes to π-allyl system and to the phenyl ring over the temperature range studied (−45°C—24°C). The conclusion was reached that the configuration of the chain end is an (E) isomer. Although the chain end is ionic (π-allyl), possibly due to the steric hindrance of γ-position, the monomer attacks the α-carbon, and consequently the inchain units are predominantly cis-1,4. However, with a decrease in the sample temperature, a small amount of the charge on the α-carbon is transferred onto the γ, β-carbon, and the phenyl ring. This leads to a considerable increase in 1,2 units in the poly(2PB) obtained at lower temperatures." @default.
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- W2022794196 date "1979-12-01" @default.
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- W2022794196 title "Characterization of Living Anion Chain End of Oligomeric 2-Phenyl-1,3-butadienyllithium" @default.
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- W2022794196 doi "https://doi.org/10.1295/polymj.11.937" @default.
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