21112-37-8Relevant articles and documents
High-capacity organic cathode active materials of 2,2′-bis-p-benzoquinone derivatives for rechargeable batteries
Yokoji, Takato,Kameyama, Yuki,Maruyama, Norihiko,Matsubara, Hiroshi
, p. 5457 - 5466 (2016)
Rechargeable batteries using organic cathode materials are expected to afford high mass energy densities since these materials can undergo multiple electron redox reactions per molecule. Although the batteries using benzoquinone (BQ) derivatives as organic cathode active materials exhibited high theoretical capacity, their practical capacities and cycle retention were far from satisfactory. To overcome these problems, dimeric BQ derivatives based on the 2,2′-bis-p-benzoquinone (BBQ) framework were synthesized, and the charge-discharge behaviour of the prepared cells using BBQs as the cathode active materials was investigated. BBQ-based cells exhibited excellent performance compared to those based on BQ monomers. For example, the BBQ cell afforded a high initial capacity of 358 A h kg-1 (more than twice that of current lithium-ion batteries that use LiCoO2 as the cathode active material) and a high cycle retention of 198 A h kg-1 at 50 cycles. Electrochemical measurements and density functional theory (DFT) calculations indicated that three electron-redox reactions generally occur in BBQ derivatives, although (OMe)2-BBQ appeared to undergo a four-electron redox reaction.
Highly selective conversion of guaiacol to: Tert -butylphenols in supercritical ethanol over a H2WO4 catalyst
Mai, Fuhang,Cui, Kai,Wen, Zhe,Wu, Kai,Yan, Fei,Chen, Mengmeng,Chen, Hong,Li, Yongdan
, p. 2764 - 2771 (2019/02/01)
The conversion of guaiacol is examined at 300 °C in supercritical ethanol over a H2WO4 catalyst. Guaiacol is consumed completely, meanwhile, 16.7% aromatic ethers and 80.0% alkylphenols are obtained. Interestingly, tert-butylphenols are produced mainly with a high selectivity of 71.8%, and the overall selectivity of 2,6-di-tert-butylphenol and 2,6-di-tert-butyl-4-ethylphenol is as high as 63.7%. The experimental results indicate that catechol and 2-ethoxyphenol are the intermediates. Meanwhile, the WO3 sites play an important role in the conversion of guaiacol and the Br?nsted acid sites on H2WO4 enhance the conversion and favour a high selectivity of the tert-butylphenols. The recycling tests show that the carbon deposition on the catalyst surface, the dehydration and partial reduction of the catalyst itself are responsible for the decay of the H2WO4 catalyst. Finally, the possible reaction pathways proposed involve the transetherification process and the alkylation process during guaiacol conversion.
Synthesis of quinoline-2-thiones via tandem indium(III)-promoted friedel-crafts alkenylation-cyclization of 2-alkynylphenyl isothiocyanates
Otani, Takashi,Kunimatsu, Shinichi,Nihei, Hiroshi,Abe, Yuko,Saito, Takao
, p. 5513 - 5516 (2008/09/17)
A new approach to the synthesis of 4-aryl- or 4-arylthioquinoline-2-thiones via indium(III) reagent-mediated tandem Friedel-Crafts alkenylation-cyclization of 2-alkynylphenyl isothiocyanates is described.
