- Applications of benchtop NMR in the organic chemistry instructional laboratory
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The instructional organic chemistry laboratory has been substantially improved through the implementation of benchtop NMR analysis. When used in conjunction with unknown reaction components in multi-outcome experiments, NMR analysis transforms the laborat
- Morrison, Richard W.,Zhang, Mengqi
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- A new 2,3-dimethoxy-1,4-naphthoquinone redox anolyte for non-aqueous organic static redox battery
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Redox flow batteries (RFB) are the choice for grid-level large-scale energy storage applications. Especially, the non-aqueous variant of RFB is considered for its unique advantages such as low cost, diverse engineering possibility of redox molecules, and
- Ramanujam, Kothandaraman,Sankararaman, Sethuraman,Vallayil, Priya
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- Preparation method of 2, 5-di-tert-butyl-p-dimethoxybenzene
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The invention discloses a preparation method of 2, 5-di-tert-butyl-p-dimethoxybenzene, which comprises the following steps: (1) reacting tert-butyl alcohol with hydroquinone in a first solvent under the action of a first catalyst, cooling and crystallizing after the reaction is finished, filtering, washing and drying to obtain 2,5-di-tert-butyl hydroquinone; and (2) reacting the 2, 5-di-tert-butyl hydroquinone obtained in the step (1) with methyl iodide in a second solvent under the action of a second catalyst, cooling to room temperature after the reaction is finished, adding brine and an organic solvent into the reaction liquid for extraction, washing the obtained organic layer, and performing vacuum drying to obtain the 2, 5-di-tert-butyl-p-dimethoxybenzene product. The method has the advantages of simple process, mild reaction conditions, environmental protection, low cost and high yield.
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Paragraph 0033; 0036-0038; 0041-0043; 0046-0048; 0051-0053
(2021/06/02)
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- 1,4-Bis(trimethylsilyl)-2,5-dimethoxybenzene: A novel redox shuttle additive for overcharge protection in lithium-ion batteries that doubles as a mechanistic chemical probe
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A novel redox shuttle additive, 1,4-bis(trimethylsilyl)-2,5-dimethoxybenzene (BTMSDB), is shown to deliver superb overcharge protection of LiFePO4 electrode in Li-ion batteries. Using this molecule as a chemical probe, we trace the cause of the
- Huang, Jinhua,Shkrob, Ilya A.,Wang, Peiqi,Cheng, Lei,Pan, Baofei,He, Meinan,Liao, Chen,Zhang, Zhengcheng,Curtiss, Larry A.,Zhang, Lu
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p. 7332 - 7337
(2015/04/14)
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- Synthesis and testing of chromogenic phenoxazinone substrates for β-alanyl aminopeptidase
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Novel 7-N-(β-alanyl)aminophenoxazin-3-one salts 27a-d have been synthesized and tested as chromogenic substrates for β-alanyl aminopeptidase, which is present in Pseudomonas aeruginosa, the most common respiratory pathogen in patients with cystic fibrosis. The biological results show that 7-N-(β-alanyl)amino-1-pentylphenoxazin-3-one trifluoroacetate salt 27a is a chromogenic substrate for this bacterium, with a low degree of diffusion in nutrient media for growing bacterial cultures and a bright red colour, making it easily distinguishable from the agar background. This journal is The Royal Society of Chemistry.
- Zaytsev, Andrey V.,Anderson, Rosaleen J.,Bedernjak, Alexandre,Groundwater, Paul W.,Huang, Yongxue,Perry, John D.,Orenga, Sylvain,Roger-Dalbert, Celine,James, Arthur
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p. XX682-692
(2008/09/17)
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- Rhenium complexes-catalyzed alkylation of arenes with alkyl halides
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Rhenium complexes have been shown to catalyze the alkylation of arenes with alkyl halides. When arenes were reacted with an alkyl chloride in the presence of a catalytic amount of rhenium complexes, such as bromopentacarbonylrhenium(I) [ReBr(CO)5], tricarbonylcyclopentadienylrhenium(I) [Re(C5H5)(CO)3] and decacarbonyldirhenium [Re2(CO)10], alkylation of the arenes proceeded under mild conditions to give a mixture of mono- and dialkyl substituted arenes in moderate-to-good yields.
- Nishiyama,Kakushou,Sonoda
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p. 2779 - 2782
(2007/10/03)
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- Selective nitration versus oxidative dealkylation of hydroquinone ethers with nitrogen dioxide
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Various alkyl-substituted p-dialkoxybenzenes (ArH) react readily with nitrogen dioxide (NO2) in dichloromethane solution via either nitration (ArNO2) or oxidative dealkylation to quinones (Q). Spectral transients indicate that these coupled processes proceed from the dialkoxybenzene radical cation (ArH+) formed as the common reactive intermediate from electron-transfer in the disproportionated precursor [ArH, NO+]NO3-. In fast subsequent steps, ArH+ undergoes homolytic coupling with NO2 (which leads to aromatic nitration) and nucleophilic attack of NO3- (which results in oxidative dealkylation). As such, the competition between nitration and oxidative dealkylation is effectively modulated by solvent polarity and added nitrate.
- Rathore,Bosch,Kochi
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p. 6727 - 6758
(2007/10/02)
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