- Selective and general exhaustive cross-coupling of di-chloroarenes with a deficit of nucleophiles mediated by a Pd-NHC complex
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We report the first example of a general, exhaustive Pd-mediated cross-coupling of polychloroarenes in the presence of a deficit of nucleophiles, mediated by the highly active PEPPSI-IPent catalyst. Our results indicate that this catalyst system may be applicable to the pseudo-living polymerisation of chloroarene monomers.
- Groombridge, Benjamin J.,Goldup, Stephen M.,Larrosa, Igor
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supporting information
p. 3832 - 3834
(2015/03/30)
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- Helical carbon and graphite films prepared from helical poly(3,4-ethylenedioxythiophene) films synthesized by electrochemical polymerization in chiral nematic liquid crystals
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Helical carbon and graphite films from helical poly(3,4- ethylenedioxythiophene) (H-PEDOT) films synthesized through electrochemical polymerization in a chiral nematic liquid-crystal (N-LC) field are prepared. The microscope investigations showed that the
- Matsushita, Satoshi,Yan, Bairu,Yamamoto, Shinsuke,Jeong, Yong Soo,Akagi, Kazuo
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supporting information
p. 1659 - 1663
(2014/03/21)
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- Solid-State Synthesis of a Conducting Polythiophene via an Unprecedented Heterocyclic Coupling Reaction
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Prolonged storage (~2 years) or gentle heating (50-80 °C) of crystalline 2,5-dibromo-3,4-ethylenedioxythiophene (DBEDOT) affords a highly conducting, bromine-doped poly(3,4-ethylenedioxythiophene) (PEDOT), as confirmed by solid-state NMR, FTIR, CV, and vis-NIR spectroscopies. The novel solid-state polymerization (SSP) does not occur for 2,5-dichloro-3,4-ethylenedioxythiophene (DCEDOT), and requires a much higher temperature (>130 °C) for 2,5-diiodo-3,4-ethylenedioxythiophene (DIEDOT). X-ray structural analysis of the above dihalothiophenes reveals short Hal...Hal distances between adjacent molecules in DBEDOT and DIEDOT, but not in DCEDOT. The polymerization may also occur in the melt but is significantly slower and leads to poorly conductive material. Detailed studies of the reaction were performed using ESR, DSC, microscopy, and gravimetric analyses. SSP starts on crystal defect sites; it is exothermic by 14 kcal/mol and requires activation energy of ~26 kcal/mol (for DBEDOT). The temperature dependence of the conductivity of SSP-PEDOT (σrt = 20-80 S/cm) reveals a slight thermal activation. It can be further increased by a factor of 2 by doping with iodine. Using this approach, thin films of PEDOT with conductivity as high as 20 S/cm were fabricated on insulating flexible plastic surfaces.
- Meng, Hong,Perepichka, Dmitrii F.,Bendikov, Michael,Wudl, Fred,Pan, Grant Z.,Yu, Wenjiang,Dong, Wenjian,Brown, Stuart
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p. 15151 - 15162
(2007/10/03)
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