The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Luping Yu - One of the best experts on this subject based on the ideXlab platform.
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A New Synthetic Approach to Novel Polymers Exhibiting Large Electrooptic Coefficients and High Thermal Stability
Macromolecules, 2000Co-Authors: Haythem A. Saadeh, Liming Wang, Luping YuAbstract:The Stille Coupling Reaction was explored to synthesize novel polymers with a pending NLO chromophore exhibiting a large μβ value but high chemical sensitivity. This approach enabled the synthesis of aromatic polyimides through the careful design of dibromo monomers bearing NLO chromophores. The resulting polyimide was shown to possess a glass transition temperature of 170 °C and a large electrooptic coefficient.
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Exploration of the Stille Coupling Reaction for the Synthesis of Functional Polymers
Journal of the American Chemical Society, 1995Co-Authors: Wai Kin Chan, Luping YuAbstract:The palladium-catalyzed Stille Coupling Reaction was used for preparing functionalized, conjugated polymers. This Reaction has several advantages, two of which are that it requires mild Reaction conditions and produces high yields. Several factors which affect the polymerization processes were investigated, such as the catalyst composition and concentration, different solvents and ligands, and structures of monomers. It was found that solvents that could keep the macromolecules in solution and stabilize the palladium(0) catalyst would yield polymers with high molecular weights. If a Pd(II) compound was used as the catalyst, a stoichiometric adjustment of the distannyl monomer was necessary to enhance the molecular weight of the resulting polymer. In general, it was found that a combination of an electron-rich distannyl monomer and an electron-deficient dihalide (ditriflate) monomer forms polymers with relatively high molecular weights. To further demonstrate the versatility of the Stille Reaction for polycondensations, different types of conjugated polymers with different properties and applications, such as liquid crystalline conjugated polymers and conjugated photorefractive polymers, were synthesized.link_to_subscribed_fulltex
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synthesis of conjugated polymer by the Stille Coupling Reaction
Chemistry of Materials, 1993Co-Authors: Wai Kin Chan, Luping YuAbstract:Reported on is the feasibility of a Coupling Reaction between dihalide and ditin compounds, catalyzed by a palladium compound, to synthesize conjugated polymers. As 2,5-dialkoxy-1,4-diiodobenzene was coupled with 2,5-bis(tri-n-butyltin)-thiophene, a soluble and fusible polymer, poly(2,5-alkoxy-p-phenylene-co-2,5-thiophene), was obtained. The rich assess to monomers, the mild Reaction conditions, and the tolerance to different substituents make this Reaction versatile in synthesizing new conjugated polymers. 16 refs., 1 fig.
Umberto Guzzi - One of the best experts on this subject based on the ideXlab platform.
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the Stille Coupling Reaction of aryl triflates with n tributylallenyl stannane a general route to arylallenes
Tetrahedron Letters, 1994Co-Authors: Domenico Badone, Rosanna Cardamone, Umberto GuzziAbstract:The palladium-copper co-catalyzed cross-Coupling Reaction of n-tributylallenyl stannane 1 with aryl triflates provides an efficient route to the corresponding aryl allenes.
Abu Taher - One of the best experts on this subject based on the ideXlab platform.
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room temperature Stille cross Coupling Reaction of unreactive aryl chlorides and heteroaryl chlorides
Chemical Communications, 2010Co-Authors: Abu TaherAbstract:Phosphanyl-β-ketoiminate Pd complexes serve as highly effective catalysts in the Stille Coupling Reaction of aryl chlorides and heteroaryl chlorides with organostannanes at room temperature.
Sang Eun Shim - One of the best experts on this subject based on the ideXlab platform.
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a highly active and general catalyst for the Stille Coupling Reaction of unreactive aryl heteroaryl and vinyl chlorides under mild conditions
ChemInform, 2013Co-Authors: Yingjie Qian, Jihoon Park, Sang Eun ShimAbstract:The use of the highly active catalyst PPA renders possible the Coupling of deactivated or sterically hindered aryl chlorides and vinyl chlorides with organostannanes to provide a variety of Coupling products (44 examples).
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a highly active and general catalyst for the Stille Coupling Reaction of unreactive aryl heteroaryl and vinyl chlorides under mild conditions
Advanced Synthesis & Catalysis, 2013Co-Authors: Yingjie Qian, Jihoon Park, Sang Eun ShimAbstract:A β-diketiminatophosphane-palladium complex was found to act as an efficient and general catalyst in the Stille Coupling Reaction of various aryl and heteroaryl chlorides with organostannanes. The results show that this catalytic system allows for the use of less reactive substrates such as deactivated or sterically hindered aryl chlorides. A catalyst loading of 0.5 mol% was sufficient to achieve excellent performance under relatively mild Reaction conditions. Furthermore, the scope of catalyst was extended to the Coupling of vinyl chlorides.
Li Chen - One of the best experts on this subject based on the ideXlab platform.
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solid phase synthesis of diaryl ketones through a three component Stille Coupling Reaction
Tetrahedron Letters, 2001Co-Authors: Shiming Li, Bingbing Wang, Li ChenAbstract:Abstract A three-component Stille Coupling Reaction on solid phase is described. Diaryl ketones bearing a wide variety of functional groups were prepared with polymer-bound organostannane and aryl halides in the presence of carbon monoxide.
