611-97-2Relevant articles and documents
Ethoxysilane appended M(II) complexes and their SiO2/MCM-41 supported forms as catalysts for efficient oxidation of secondary alcohols
Antony, Rajendran,Marimuthu, Rajendiran,Vishnoi, Pratap,Murugavel, Ramaswamy
, p. 173 - 182 (2018)
Divalent transition metal complexes ML2 (M = Mn 1; Co 2; Cu 3; Zn 4), possessing an ethoxysilane group as a part of the bidentate Schiff base ((E)-1-((3-(triethoxysilyl)propylimino)methyl)naphthalen-2-ol (L)), have been synthesized. While the copper complex 3 has been isolated in an analytically pure form and characterized by spectroscopic and single crystal XRD studies, the formation of complexes 1, 2, and 4 in solution has been verified by ESI mass spectroscopy and subsequently used for further catalyst preparation without their isolation. Treatment of the in situ formed 1–4 with pre-activated silica in boiling toluene produces the catalysts 5–8, respectively. The copper complex 3 was also treated with MCM-41 in boiling toluene to obtain CuL2@MCM-41 (9). Elemental analysis (CHN), ESI MS, IR, UV–vis., 13C & 29Si NMR, EPR, P-XRD, TGA, BET, SEM and TEM have been used to characterize the compounds. Compounds 3 (homogeneous) and 5–9 (heterogeneous) have been utilized as catalysts in the oxidation of secondary alcohols to corresponding carbonyls in the presence of H2O2, t-BuOOH, and C6H5C(CH3)2OOH. 3 and 9 have shown better catalytic activity than the rest of the catalysts investigated. Combination of 9 with H2O2 is the best catalytic system due to its efficiency and reusability besides being environment friendly.
Mechanism of Photochemical Reaction of Contact Charge Transfer Pair between 1,1-Diarylethene and Oxygen
Kojima, Masanobu,Ishida, Akito,Takamuku, Setsuo
, p. 979 - 982 (1993)
Selective excitation of the contact charge transfer band between 1,1-diarylethene and oxygen in dichloromethane and acetonitrile gave 3,3,6,6-tetraaryl-1,2-dioxane and benzophenone derivative through an electron transfer reaction.The proposed mechanism was confirmed by the direct observation of the dimer cation radical of the olefin trapped by a triplet oxygen in pulse radiolysis.
Preparation method of diaryl ketone
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, (2022/02/24)
The invention relates to the field of organic compound preparation chemistry, and particularly discloses a preparation method of diaryl ketone. The preparation method comprises the following steps: reacting tartrate with an aryl Grignard reagent to prepare 1,1,4,4-tetraaryl butantetraol; the method comprises the following steps: in the presence of an organic alkali and under a specific temperature condition, carrying out a highly regioselective 2, 3-cyclic sulfite esterification reaction on the 1,1,4,4-tetraaryl butantetraol and thionyl chloride to generate dichloro aryl cyclic sulfite; and reacting the dichloro aryl cyclic sulfite with inorganic alkali liquor at a certain temperature in a certain organic solvent to generate the diaryl ketone. The preparation method avoids the use of an expensive heavy metal-containing catalyst, and has the remarkable characteristics of easily available raw materials, simplicity and convenience in operation, excellent reaction region selectivity, easiness in treatment, high yield and the like.
Photo-induced oxidative cleavage of C-C double bonds for the synthesis of biaryl methanoneviaCeCl3catalysis
Xie, Pan,Xue, Cheng,Du, Dongdong,Shi, SanShan
supporting information, p. 6781 - 6785 (2021/08/20)
A Ce-catalyzed strategy is developed to produce biaryl methanonesviaphotooxidative cleavage of C-C double bonds at room temperature. This reaction is performed under air and demonstrates high activity as well as functional group tolerance. A synergistic Ce/ROH catalytic mechanism is also proposed based on the experimental observations. This protocol should be the first successful Ce-catalyzed photooxidation reaction of olefins with air as the oxidant, which would provide inspiration for the development of novel Ce-catalyzed photochemical synthesis processes.
Visible-Light-Driven Selective Air-Oxygenation of C?H Bond via CeCl3 Catalysis in Water
Xie, Pan,Xue, Cheng,Shi, Sanshan,Du, Dongdong
, p. 2689 - 2693 (2021/05/07)
Visible-light-induced C?H aerobic oxidation is an important chemical transformation that can be applied for the synthesis of aromatic ketones. High-cost catalysts and toxic solvents were generally needed in the present methodologies. Here, an efficient aqueous C?H aerobic oxidation protocol was reported. Through CeCl3-mediated photocatalysis, a series of aromatic ketones were produced in moderate to excellent yields. With air as the oxidant, this reaction could be performed under mild conditions in water and demonstrated high activity and functional group tolerance. This method is economical, highly efficient, and environmentally friendly, and it will provide inspiration for the development of aqueous photochemical synthesis reactions.
