13047-06-8Relevant articles and documents
Retro-Brook Rearrangement of Ferrocene-Derived Silyl Ethers
Bariak, Vladimír,Malastová, Andrea,Almássy, Ambroz,?ebesta, Radovan
, p. 13445 - 13453 (2015)
An intramolecular Li-Si exchange was observed on various lithiated ferrocenylbenzyl silyl ethers. The thermodynamically more stable C-silylated isomers were isolated in good yields and fully characterized. The reaction mechanism of the [1,4] retro-Brook rearrangement was investigated by DFT calculations. Two distinct reaction routes were proposed and a possible stabilization effect of the ferrocenyl fragment on the C-silylated isomers was described. The diastereoselective rearrangement of the trimethylsilyl group to the ortho position of the ferrocenyl cyclopentadienyl ring was also accomplished and the absolute configuration of the product was determined. Rearrange it: The lithiation of 2-bromophenyl-substituted ferrocenyl silyl ethers initiates an effective [1,4]-retro-Brook rearrangement (see scheme, R=methyl, tBu, or iPr). This rearrangement proceeds also if a carbanionic intermediate is generated by diastereoselective ortho-lithiation of the ferrocene moiety.
Bunnett et al.
, p. 4197 (1979)
Heteropoly acid encapsulated into zeolite imidazolate framework (ZIF-67) cage as an efficient heterogeneous catalyst for Friedel-Crafts acylation
Ammar, Muhammad,Jiang, Sai,Ji, Shengfu
, p. 303 - 310 (2016)
A new strategy has been developed for the encapsulation of the phosphotungstic heteropoly acid (H3PW12O40 denoted as PTA) into zeolite imidazolate framework (ZIF-67) cage and the PTA@ZIF-67(ec) catalysts with different PTA content were prepared. The structure of the catalysts was characterized by XRD, BET, SEM, FT-IR, ICP-AES and TG. The catalytic activity and recovery properties of the catalysts for the Friedel-Crafts acylation of anisole with benzoyl chloride were evaluated. The results showed that 14.6-31.7 wt% PTA were encapsulated in the ZIF-67 cage. The PTA@ZIF-67(ec) catalysts had good catalytic activity for Friedel-Crafts acylation. The conversion of anisole can reach ~100% and the selectivity of the production can reach ~94% over 26.5 wt% PTA@ZIF-67(ec) catalyst under the reaction condition of 120 °C and 6 h. After reaction, the catalyst can be easily separated from the reaction mixture by the centrifugation. The recovered catalyst can be reused five times and the selectivity can be kept over 90%.
Asymmetric Transfer Hydrogenation of Diaryl Ketones with Ethanol Catalyzed by Chiral NCP Pincer Iridium Complexes
Huang, Zheng,Liu, Guixia,Qian, Lu,Tang, Xixia,Wang, Yulei
supporting information, (2022/02/23)
The use of a chiral (NCP)Ir complex as the precatalyst allowed for the discovery of asymmetric transfer hydrogenation of diaryl ketones with ethanol as the hydrogen source and solvent. This reaction was applicable to various ortho-substituted diaryl keontes, affording benzhydrols in good yields and enantioselectivities. This protocol could be carried out in a gram scale under mild reaction conditions. The utility of the catalytic system was highlighted by the synthesis of the key precursor of (S)-neobenodine.
Method for preparing aldehyde ketone compound through olefin oxidation
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Paragraph 0019, (2021/04/07)
The invention provides a method for preparing an aldehyde ketone compound by olefin oxidation, which relates to an olefin oxidative cracking reaction in which oxygen participates. The method comprises the following specific steps: in the presence of a solvent and an oxidant, carrying out oxidative cracking on an olefin raw material to obtain a corresponding aldehyde ketone product. Compared with the traditional method, the method does not need to add any catalyst or ligand, does not need to use high-pressure oxygen, has the advantages of simple and mild reaction conditions, environment friendliness, low cost, high atom economy and the like, is wide in substrate application range and high in yield, and has a wide application prospect in the aspects of synthesis of aldehyde ketone medical intermediates and chemical raw materials.
COMPOUND FOR ORGANIC ELECTRONIC ELEMENT, ORGANIC ELECTRONIC ELEMENT USING THE SAME, AND AN ELECTRONIC DEVICE THEREOF
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Paragraph 0157; 0163-0167, (2021/07/06)
The present invention relates to a compound for an organic electric device, an organic electric device using the same, and an electronic apparatus including the organic electric device. According to the present invention, the organic electric device having high luminous efficiency, low driving voltage, and high heat resistance can be provided, and color purity and lifespan of the organic electric device can be improved.
