13102-33-5Relevant academic research and scientific papers
Selective Activation of Aromatic Aldehydes Promoted by Dispersion Interactions: Steric and Electronic Factors of a π-Pocket within Cage-Shaped Borates for Molecular Recognition
Tanaka, Daiki,Tsutsui, Yuya,Konishi, Akihito,Nakaoka, Koichi,Nakajima, Hideto,Baba, Akio,Chiba, Kouji,Yasuda, Makoto
, p. 15023 - 15034 (2020)
Selective bond formations are one of the most important reactions in organic synthesis. In the Lewis acid mediated electrophile reactions of carbonyls, the selective formation of a carbonyl–acid complex plays a critical role in determining selectivity, wh
Expedient synthesis of symmetric aryl ketones and of ambient-temperature molten salts of imidazole
Lucas,El Mehdi,Ho,Belanger,Breau
, p. 1253 - 1258 (2000)
A short procedure for the synthesis of 2,2-di(3-thienyl)-1,3-dioxolan is described. The route developed is convenient (only two synthetic and one chromatographic steps are required) and efficient (66% overall yield from 3-bromothiophene). This compound was transformed into the ketone, cyclopenta[2,1-b:3',4'-b']dithiophen-4-one by a known process. Optimized syntheses of symmetric aryl ketones, 1-alkyl-3-methylimidazolium and 1-alkyl-2-methyl-3-methylimidazolium liquid salts are also reported.
Mechanochemical Grignard Reactions with Gaseous CO2 and Sodium Methyl Carbonate**
Pfennig, Victoria S.,Villella, Romina C.,Nikodemus, Julia,Bolm, Carsten
supporting information, (2022/01/22)
A one-pot, three-step protocol for the preparation of Grignard reagents from organobromides in a ball mill and their subsequent reactions with gaseous carbon dioxide (CO2) or sodium methyl carbonate providing aryl and alkyl carboxylic acids in up to 82 % yield is reported. Noteworthy are the short reaction times and the significantly reduced solvent amounts [2.0 equiv. for liquid assisted grinding (LAG) conditions]. Unexpectedly, aryl bromides with methoxy substituents lead to symmetric ketones as major products.
Palladium imine-pyridine-imine complex immobilized on graphene oxide as a recyclable catalyst for the carbonylative homo-coupling of aryl halides
Niakan, Mahsa,Asadi, Zahra,Khosrozadeh, Fatemeh
, p. 850 - 863 (2020/12/18)
A heterogeneous 3-N,N,N-(II) Pd(OAc)2 catalyst was prepared from the reaction of Pd(OAc)2 with Si-Prn-N = C-Py-C = N-Prn-Si immobilized on graphene oxide (GO-Si-Prn-N = C-Py-C = N-Prn-Si-GO). The prepared catalyst was characterized by inductively coupled plasma optical emission spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, UV-vis spectroscopy, BET surface area, scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis. The catalyst was employed as a heterogeneous catalyst for carbonylative homo-coupling of aryl iodides and bromides under carbon monoxide gas-free condition. Cr(CO)6 was used as the carbon monoxide source and the desired symmetrical diaryl ketones were achieved in good to excellent yields. Moreover, the catalyst was reused up to five consecutive cycles without significant loss of activity.
Photo-induced phosphorus radical involved semipinacol rearrangement reaction: Highly synthesis of γ-oxo-phosphonates
Wang, Chunhai,Huang, Xiaoling,Liu, Xueting,Gao, Suqian,Zhao, Bin,Yang, Shangdong
supporting information, p. 677 - 680 (2019/08/27)
Hydroxyphosphoric acids display the unique biological activities, and they have some attractive prospects as clinical drug moleculars. Herein, a new approach for the synthesis of γ-oxo-phosphonates (the precursor of hydroxyphosphoric acid) has been established through the semipinacol rearrangement tactic involved the photo-induced phosphorus radical process. Most important, this transformation is avoid of the external oxidants, and occurs very well under the sunlight irradiation, meanwhile the γ-oxo-phosphonate was easily derivatized to obtain γ-hydroxyphosphoric acid, thus highlights the synthesis value of this method.
Sodium Methyl Carbonate as an Effective C1 Synthon. Synthesis of Carboxylic Acids, Benzophenones, and Unsymmetrical Ketones
Hurst, Timothy E.,Deichert, Julie A.,Kapeniak, Lucas,Lee, Roland,Harris, Jesse,Jessop, Philip G.,Snieckus, Victor
supporting information, p. 3882 - 3885 (2019/06/07)
Reported is the synthesis of carboxylic acids, symmetrical ketones, and unsymmetrical ketones with selectivity achieved by exploiting the differential reactivity of sodium methyl carbonate with Grignard and organolithium reagents.
The cytochrome: C -cyclo[6]aramide complex as a supramolecular catalyst in methanol
Pan, Wang,Mao, Lijun,Shi, Mingsong,Fu, Yonghong,Jiang, Xiaomin,Feng, Wen,He, Youzhou,Xu, Dingguo,Yuan, Lihua
supporting information, p. 3857 - 3866 (2018/03/06)
A hydrogen-bonded macrocycle, cyclo[6]aramide, was found to form a supramolecular complex with cytochrome c, which enables the solubilization of the heme protein in methanol. The supramolecular complexation was evidenced by UV-vis, CD, and Raman spectroscopic techniques via structural characterization. Computational simulation based on the DFT method reveals the presence of strong hydrogen bonds formed between the lysine residues exposed on the protein surface and the oxygen atoms residing in the cavity of cyclo[6]aramide apart from cation-π interactions. The resulting cytochrome c-cyclo[6]aramide 1 exhibited higher activities than unmodified cytochrome c in the oxidation of benzhydrol to benzophenone with hydrogen peroxide at low temperatures. The enhanced activity with lowering temperature up to -40 °C indicates that the complex can act as a "cold-active" synzyme. The results achieved here demonstrate the potential of hydrogen-bonded macrocycles in supramolecular chemistry for catalytic reactions via ligand-protein interactions.
Preparation method of emission-adjustable tetraphenylethylene solid fluorescent dye
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Paragraph 0051-0053, (2019/04/30)
The invention belongs to the technical field of organic compound preparation and relates to a preparation method of emission-adjustable tetraphenylethylene solid fluorescent dye. The preparation mechanism is as follows: hydrogen atoms on hydroxyl of 2,2'-dihydroxy benzophenone are relatively active and firstly substituted with methoxy for protection. Methylene in diphenylmethane is subjected to lithiation with n-butyllithium, 2,2'-dimethoxybenzophenone is added to react with methylene, a reaction product is dehydrated under the catalysis of p-toluenesulfonic acid and reacts with alkyl dihalidewith different chain lengths after being hydrolyzed, so that alkoxy bridges with different chain lengths are introduced into alpha sites of adjacent benzene rings of tetraphenylethylene, conformationadjustment of tetraphenylethylene is performed by use of different chain lengths of alkoxy bridges, and the tetraphenylethylene dye with different emission wavelengths is obtained.
Regulating the emission of tetraphenylethenes by changing the alkoxyl linkage length between two neighboring phenyl moieties
Lou, Dandan,Lu, Xiangcheng,Zhang, Mengxing,Bai, Ming,Jiang, Jianzhuang
supporting information, p. 6987 - 6990 (2018/06/29)
Alkoxyl linkages with different carbon lengths are employed to link the two neighboring ortho carbons of the two phenyl moieties at the same ethylene carbon of the tetraphenylethene framework, resulting in successful regulation of the molecular conformati
Catalysts, ligands and use thereof
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Page/Page column 71, (2017/05/17)
According to the present invention, there is provided a catalytic complex comprising a metal, one or more ligands and one or more counterions, wherein said one or more ligands include a non-racemic chiral ligand and wherein said one or more counterions include a triflimide counterion. Also provided are methods of making said catalytic complex and processes for producing chiral compounds which involve the use of said catalytic complex. In addition, the present invention provides compounds of the formula (2) as defined herein. The compounds of formula (2) may be useful as ligands in catalytic complexes.
