- Ultrasonically activated reduction of substituted nitrobenzenes to corresponding N-arylhydroxylamines
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Arylhydroxylamines can be obtained by reduction of the corresponding nitroaromatic compounds. We report here an efficient preparation of arylhydroxylamines by a controlled reduction of nitro compounds using zinc metal and ammonium chloride under ultrasonic activation in very short reaction times.
- Ung, Stéphane,Falguières, Annie,Guy, Alain,Ferroud, Clotilde
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Read Online
- Palladium Supported on Carbon Nanoglobules as a Promising Catalyst for Selective Hydrogenation of Nitroarenes
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The catalysts 1?wt% palladium supported on carbon nanoglobules (CNGs) were shown to be highly active in the liquid-phase hydrogenation of various nitroarenes and provided nearly 100% selectivity to aromatic amines at complete conversion under mild conditions (323?K, 0.5?MPa, 1?h). The catalytic activity (in terms of turnover frequency and substrate conversion) and selectivity depend on the kind of CNGs support, catalyst preparation method and the reaction conditions (solvent nature). The Pd/CNGs catalyst can be repeatedly used while maintaining the same catalytic performance. The excellent performances of Pd/CNGs catalysts can be due to the globular morphology of the supports as well as the absence of micropores and pronounced surface defects. Graphic Abstract: [Figure not available: see fulltext.]
- Mironenko,Belskaya,Stepanova,Gulyaeva,Trenikhin,Likholobov
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p. 888 - 900
(2019/11/11)
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- HOLOGRAPHIC RECORDING MEDIUM
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Disclosed herein are novel nitrone compounds, holographic recording media that include the nitrone compound(s) and a polymer binder, a method of manufacturing a holographic recording medium where the nitrone compound, as a photochromic dye, is mixed with
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Paragraph 0067; 0068
(2015/06/16)
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- Rhodium(III)-catalyzed internal oxidative coupling of N-hydroxyanilides with alkenes via C-H activation
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Abstract Described herein is an efficient new method for ortho-olefination of anilides in the presence of AgSbF6 and NaOAc via rhodium(III)-catalyzed internal oxidative C-H bond activation based on hydroxyl as directing and oxidative group. A range of alkenes and functional groups on acetanilides is supported and a possible mechanism is proposed according to the experimental results.
- Wen, Jing,Wu, An,Chen, Pei,Zhu, Jin
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supporting information
p. 5282 - 5286
(2015/08/26)
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- Synthesis of N-arylhydroxylamines by Pd-catalyzed coupling
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Pd-catalyzed coupling of aryl halides with TeocNHOTBS, followed by treatment of the products with TBAF, provides effective access to a wide range of N-arylhydroxylamines by a route that produces stable doubly-protected intermediates and allows the protective groups to be removed under mild conditions that do not cause extensive degradation of the final product.
- Beaudoin, Daniel,Wuest, James D.
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experimental part
p. 2221 - 2223
(2011/05/05)
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- COMPOSITIONS AND METHOD FOR MAKING THEREOF
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A composition has a structure as shown in formula I: R1 and R2 are independently at each occurrence an aliphatic radical having from 1 to about 10 carbons, a cycloaliphatic radical having from about 3 to about 10 carbons, or an aroma
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Page/Page column 10
(2010/02/17)
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- COMPOSITIONS AND METHODS FOR STORING HOLOGRAPHIC DATA
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In one aspect, the present invention provides a novel thiophene-containing polynitrone compound having structure (II) wherein R1 is independently at each occurrence a C1-C20 aliphatic radical, a C3-C20 /su
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Page/Page column 13
(2009/04/24)
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- Ultrasound-promoted highly chemoselective reduction of aromatic nitro compounds to the corresponding N-arylhydroxylamines using zinc and HCOONH 4 in CH3CN
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N-Arylhydroxylamines were prepared in high yields through chemoselective reduction of the corresponding aromatic nitro compounds under ultrasound (59 kHz) at room temperature using a convenient Zn/HCOONH4/CH 3CN system. This method was highly efficient, environmentally benign, especially simple and practical. Copyright
- Shi, Qi Xun,Lu, Rong Wen,Jin, Kun,Zhang, Zhu Xia,Zhao, De Feng
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p. 226 - 227
(2007/10/03)
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- Mechanism and reactivity in perborate oxidation of anilines in acetic acid
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Perborate but not percarbonate in acetic acid generates peracetic acid on standing and the peracetic acid oxidation of anilines is fast. The oxidation with a fresh solution of perborate in acetic acid is smooth and second order but the specific oxidation rate increases with increasing [perborate]0 or [boric acid]. Perborate on dissolution affords hydrogen peroxide and a borate; the latter assists the former in the oxidation. The oxidation rates of anilines under identical conditions do not conform to any of the linear free energy relationships but the reaction rates of molecular anilines do. Perborate oxidation proceeds via two reaction paths but the overall oxidation rates of molecular anilines conform to structure reactivity relationships; the transition states do not differ significantly. Analysis of the oxidation rates of perborate and percarbonate reveals that while perborate oxidation is faster than percarbonate it is at least as selective as the latter.
- Karunakaran, Chockalingam,Kamalam, Ramasamy
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p. 2011 - 2018
(2007/10/03)
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- Kinetics and Mechanism of Oxidation of para-Substituted Anilines by Peroxomonosulphate
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Kinetics of oxidation of several para-substituted anilines by peroxomonosulphate (PMS) in aqueous acetic acid medium have been investigated. The reaction follows a total second order, first order each in [PMS] and [substrate]. The reaction rate is retarted by both electron-releasing and withdrawing groups. Absence of free radical formation is confirmed. Activation energy and thermodynamic parameters have been computed. A probable mechanism has been proposed.
- Abdul Jameel,Maruthamuthu
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p. 368 - 370
(2007/10/03)
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- Promoting effect of na2SeO3 on the activity of MoO3 catalyst for nitroarenes reduction to amines with sodium borohydride
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Sodium selenite enhances the catalytic activity of molybdenum(VI) oxide during the reduction of nitroarenes (XC6H4NO2, X = 4-CN, 4-CO2Et, H, 4-Cl, 2-Me, 3-Me, 4-Me, 4-OMe) with sodium borohydride to arenamines (86-98 % yields) under mild conditions. X= 4-CN, 4-CO2Et, H, 4-Cl, 2-Me, 3-Me, 4-Me, 4-OMe in 86-98 % yields.
- Yanada, Kazuo,Yanada, Reiko,Meguri, Haruo
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p. 1463 - 1464
(2007/10/02)
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- Synthesis of N-Arylhydroxylamines by Tellurium-Catalyzed Reduction of Aromatic Nitro Compounds
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p-Substituted nitrobenzenes were readily reduced with sodium borohydride and a catalytic amount of tellurium to give the corresponding hydroxylamines in good yields.
- Uchida, Shuji,Yanada, Kazuo,Yamaguchi, Hiromi,Meguri, Haruo
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p. 1069 - 1070
(2007/10/02)
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- Selenium-catalysed Reduction of Aromatic Nitro Compounds to N-Arylhydroxylamines
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Metallic selenium catalyses the reduction of aromatic nitro compounds to the corresponding N-arylhydrohylamines with sodium borohydride under mild conditions.
- Yanada, Kazuo,Yamaguchi, Hiromi,Meguri, Haruo,Uchida, Shuji
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p. 1655 - 1656
(2007/10/02)
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