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- W2034266331 abstract "In this contribution, alkyne metathesis of 1,4-dipropynylated benzenes 3 is reported. High-molecular weight poly(p-phenyleneethynylenes) 4 form from 3 under concomitant evolution of butyne. The highly active catalyst system employed in this polymerization reaction forms from commercially available Mo(CO)6 and 4-chlorophenol or 4-trifluoromethylphenol in situ at 140 °C in off-the-shelf quality 1,2-dichlorobenzene. Introduction of dry nitrogen into the reaction vessel serves to remove the byproduct, 2-butyne. Several dipropynylated benzenes 3 carrying solubilizing alkyl (hexyl, nonyl, dodecyl, 2-(ethyl)hexyl, ethylbutyl, isopentyl, 3,7-dimethyloctyl, 2,5,5-trimethylhexyl, cyclohexyl, isopentyloxy) or alkoxy substituents were prepared starting from 1,4-dichlorobenzene (alkyl substituted) or hydroquinone (alkoxy substituted). Polymerization of the monomers 3 furnished the yellow and highly fluorescent poly(p-phenyleneethynylene)s 4 in excellent to quantitative yields and high purity. For soluble derivatives, the degree of polymerization (Pn) is observed in the range 1 × 102 ≤ Pn ≤ 13 × 102, while the polydispersities (Mw/Mn) appear in a bracket, 2 ≤ Mw/Mn ≤ 4.5. Miscellaneous optimizations (time, temperature) were performed. Maximum molecular weights are obtained at reaction temperatures around 130−150 °C and reaction times of 25−30 h." @default.
- W2034266331 created "2016-06-24" @default.
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- W2034266331 date "1999-06-01" @default.
- W2034266331 modified "2023-10-15" @default.
- W2034266331 title "High Molecular Weight Poly(<i>p</i>-phenyleneethynylene)s by Alkyne Metathesis Utilizing “Instant” Catalysts: A Synthetic Study" @default.
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- W2034266331 doi "https://doi.org/10.1021/ma9900535" @default.
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