- Synthesis, some spectroscopic and electrochemical investigations on novel monomeric and polymeric acetylene substituted thiophene monomers and polymers
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Acetylene substituted thiophenes of the following types were synthesized: Formula Presented These monomers were polymerized to the corresponding polymers. The UV-spectra and their oxidation potentials were determined. Attempts to correlate these two prope
- Zimmer, Hans,Sudsuansri, Kobkul,Mark Jr., Harry B.,Ziegler, Bernd
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- Palladium-catalyzed syntheses of polyethynyl-substituted 2,2′-bithiophenes
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The syntheses of polyethynyl-substituted 2,2′-bithiophenes 2 and related 5,5′-dicarbaldehyde derivatives 1 are described. The treatment of easily available polybrominated 2,2′-bithiophenes 3 and 2,2′-bithiophene-5,5′-dicarbaldehydes 4 with phenyl or (trimethylsilyl)acetylene in the presence of PdII and CuI in (i-Pr)2NH yields substituted polyethynyl-2,2′-bithiophene compounds. The Me3Si protecting groups can be removed by protodesilylation under basic conditions to give the corresponding terminal ethynyl groups. These polyethynyl-bithiophenes could be interesting precursors for the synthesis of macrocycles with interesting properties.
- Dahlmann, Uwe,Neidlein, Richard
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- A Bithiophene-Promoted ppm Levels of Palladium-Catalyzed Regioselective Hydrosilylation of Terminal Allenes
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A bithiophene?alkyne-based compound was synthesized and first utilized as a ligand for the selective hydrosilylation of allenes with primary and secondary phenylsilanes. It shows high selectivity towards the production of branched allylsilanes with a wide range of allenes. It is worth mentioning that the catalytic loading of the palladium can be reduced to 500 ppm. This work opens a new front of using bidentate thiophene ligand as a reaction promoter in transition-metal-catalyzed organic reaction. (Figure presented.).
- Chen, Jun-Jia,Zeng, Jia-Hao,Yang, Ying,Liu, Zhi-Kai,Jiang, Ya-Nan,Li, Miao-Ran,Chen, Li,Zhan, Zhuang-Ping
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p. 2360 - 2366
(2020/04/28)
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- Thiophene-Alkyne-Based CMPs as Highly Selective Regulators for Oxidative Heck Reaction
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Thiophenes containing an adjacent C≡C group as ligands for PdII-promoted organic reactions are reported for the first time. These ligands were utilized as catalytic sites and integrated into the skeleton of conjugated microporous polymers. By e
- Li, Ren-Hao,Ding, Zong-Cang,Li, Cun-Yao,Chen, Jun-Jia,Zhou, Yun-Bing,An, Xiao-Ming,Ding, Yun-Jie,Zhan, Zhuang-Ping
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supporting information
p. 4432 - 4435
(2017/09/11)
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- Pd-catalyzed oxidative cross-coupling between two electron rich heteroarenes
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The transition-metal-catalyzed oxidative cross-coupling between two coupling partners with similar structure and electronic characteristics remains a challenge owing to difficulty in suppressing undesired homo-couplings. We herein report a Pd-catalyzed oxidative cross-coupling between two thiophenes under mild reaction conditions. This approach can also be extended to furans. Some notable advantages of this reaction lie in its synthetic simplicity with the omission of the toxic stannanes coupling partner and excellent functional-group compatibility. The features of this protocol make it an ideal strategy for the construction of a 2,2′-thiophene-thiophene linkage of interest in electronic and optoelectronic materials.
- He, Chun-Yang,Wang, Zhen,Wu, Cai-Zhi,Qing, Feng-Ling,Zhang, Xingang
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p. 3508 - 3513
(2013/11/19)
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- Palladium-catalyzed oxidative cross-coupling between heterocycles and terminal alkynes with low catalyst loading
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Direct: With [Pd2(dba)3] as a catalyst, the direct alkynylation of thiophenes bearing a variety of substituents has been accomplished by using terminal alkynes as alkynylating reagents. This protocol is also applicable to other electron-rich aromatic heterocycles. dba=dibenzylidenacetone. Copyright
- Jie, Xiaoming,Shang, Yaping,Hu, Peng,Su, Weiping
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supporting information
p. 3630 - 3633
(2013/04/23)
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- Synthesis and physical properties of α,ω-bis[Co2(CO)6{μ-η2:η2-C(R)≡C}]oligothiophenes
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α,ω-Bis[Co2(CO)6{μ-η 2:η2-C(R)≡C}]oligothiophene derivatives (6-10), in which two dicobalt hexacarbonyl acetylides are π-conjugated onto both terminals of the oligothiophene, were prepared by the reaction of the
- Jung, Taeg Sung,Kim, Joo Hwan,Jang, Eun Kyung,Kim, Dong Hyun,Shim, Yoon-Bo,Park, Bongjin,Shin, Sung Chul
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p. 232 - 237
(2007/10/03)
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