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- W2891448820 abstract "We synthesized a zig-zag shaped polymer by the direct arylation of 3,3’-dihexyl-2,2’-bithiophene with 4,5-dibromo-2,7-di-tert-butyl-9,9-dimethylxanthene in common solvents (polar: N,N-dimethylacetoamide and less polar: toluene) at various concentrations. The direct arylation in N,N-dimethylacetoamide at a high concentration (0.6 M) produced a mixture of cyclic oligomers as byproducts and the expected polymer (Poly-n-A: Mn = 3400, Mw/Mn = 1.80). Conversely, the reaction in toluene afforded only a low-molecular-weight polymer (Mn < 2000) in a low yield. The MALDI-TOF mass spectrum of Poly-n-A revealed that it comprised repeating xanthene–bithiophene units with no homo-coupling or branching ones. The ESI mass analysis indicated that it comprised zig-zag-shaped polymers along with oligomeric and cyclic byproducts. The oligomeric and cyclic byproducts were easily removed from the mixtures by washing with acetone; the polymer (Mn = 8100, Mw/Mn = 1.30) could be isolated by this process." @default.
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- W2891448820 date "2018-12-01" @default.
- W2891448820 modified "2023-10-12" @default.
- W2891448820 title "Study on Direct Arylation of Bithiophene with Dibromoxanthene: Detection of Polymer, Oligomeric and Cyclic Byproducts and Easy Separation of the Polymer" @default.
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- W2891448820 doi "https://doi.org/10.1016/j.mtcomm.2018.09.008" @default.
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