- Method for preparing diphenylethanone from benzyl alcohol through photocatalytic one-step method
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The present invention relates to a method for preparing diphenylethanone from benzyl alcohol through a photocatalytic one-step method. According to the method, diphenylethanone is directly prepared byusing inexpensive benzyl alcohol as a raw material under the action of a solid photocatalyst; and the reaction process comprises: mixing benzyl alcohol, a catalyst and an acetonitrile solvent are mixed, placing in a pressure container, replacing with an inert gas, and carrying out illumination stirring at a room temperature, wherein the reaction time is more than 1 h, the catalyst is easily separated from the reaction system after the reaction and can be recycled multiple times, and the separation yield of diphenylethanone is up to 81%.
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Paragraph 0043; 0044
(2018/09/13)
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- Optical, electrochemical, and sensing properties of polyfluorenes bearing thiazole or oxazole and triphenylamine in the main chain
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Polyfluorenes bearing thiazole (PFTH) or oxazole (PFOX) heterocyclic units as well as triphenylamine (TPA) in the main chain were synthesized. The ratio of thiazole or oxazole/TPA in the polymer chain varies from 100/0 to 25/75. The optical properties of polymers depend on thiazole or oxazole contents. Cyclic voltammetry reveals that thiazole or oxazole hinder the oxidation of polymers and only polymers with TPA show reversible oxidation. The Electron Affinities do not practically depend on composition of the polymer chain. The sensing properties of polymers PFTH100 and PFOX100 are investigated toward several cations and anions. Polymers detect two analytes, Fe2+ and Hg2+. PL quenching shows linear response to Fe2+ in wide concentration region 1–800 μΜ. I? anions quench the emission of polymers. Hg2+ turns on the emission of the polymer/I? complex at concentrations as low as 1 μM. Enhancement of polymer/I? emission exhibits linear response to Hg2+ concentration. PFTH100 is able to detect Fe2+ and Hg2+ that coexist in a solution.
- Sarigiannis, Yiannis,Spiliopoulos, Ioakim K.
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p. 243 - 254
(2016/12/22)
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- Selective reduction of carbonyl groups in the presence of low-valent titanium reagents
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The chemoselective reduction of several structurally diverse compounds containing carbonyl groups was achieved in the presence of low-valent titanium reagents. This novel synthetic method provides easy access to highly selective reduction of carbonyl groups, and possesses several advantages including one-step procedure, convenient manipulation, good to excellent yields, and short reaction times.
- Lin, Wei,Hu, Ming-Hua,Feng, Xian,Fu, Lei,Cao, Cheng-Pao,Huang, Zhi-Bin,Shi, Da-Qing
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p. 2238 - 2242
(2014/04/17)
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- A structureeactivity relationship study on the Wacker oxidation of stilbenes at ambient condition
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To evaluate which structural elements of the stilbenes are responsible for their activity on the Wacker oxidation, a series of stilbenes with various functional moieties and substitution patterns were considered. In this regard, it is found that the oxidation rate of stilbenes strongly depends on their structures to give the corresponding carbonyl compounds. Consequently, the ortho position of alkene and methoxy groups plays a key role in the complexation with PdCl2. The oxidation process is clean with high selectivity of product and low percentage of byproducts.
- Darabi, Hossein Reza,Mirzakhani, Mohsen,Aghapoor, Kioumars,Jadidi, Khosrow,Faraji, Laleh,Sakhaee, Nader
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p. 131 - 134
(2013/10/01)
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- The NHCs-mediated cross-coupling of aromatic aldehydes with benzyl halides: Synthesis of α-aryl ketones
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A new NHCs-mediated synthetic method was found to produce α-aryl ketones in 22-63% yields in one-pot process from the corresponding aromatic aldehydes and benzyl halides. This method is the first example of the NHCs-mediated intermolecular nucleophilic acylation of aromatic aldehydes with benzyl halides.
- Lin, Lu,Li, Yi,Du, Wenting,Deng, Wei-Ping
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experimental part
p. 3571 - 3574
(2010/08/07)
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- Unprecedented McMurry Reactions with Acylsilanes: Enedisilane Formation versus Brook Rearrangement
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The first inter- and intramolecular McMurry reactions of aroyltrimethylsilanes to substituted 1,2-bis(trimethylsilyl)ethene derivatives 2a-c and 7 are described.A low-valent titanium reagent prepared by the reduction of TiCl3 with Na on inorganic supports (Al2O3, NaCl, TiO2) turned out to be best suited.Depending on the reaction conditions and on the particular substitution patterns of substrates, Brook rearrangements of the intermediate 1,2-disilylated titanium-1,2-diolates leading to the formation of C,O-disilyl-enol ethers may compete with the McMurry deoxygenation pathway.
- Fuerstner, Alois,Seidel, Guenter,Gabor, Barbara,Kopiske, Carsten,Krueger, Carl,Mynott, Richard
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p. 8875 - 8888
(2007/10/03)
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- 6-Hydroxy-5,6-phenyl-2,3,5,6-tetrahydroimidazo[2,1-b]thiazoles
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The compounds are 6-hydroxy-5,6-substituted-phenyl-2,3,5,6-tetrahydroimidazo[2,1-b]thiazoles which have antiarthritic activity and are useful as intermediates for preparing 2,3-dihydroimidazo[2,1-b]thiazole antiarthritic compounds. A particular compound o
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