- Ni-W2C/mpg-C3N4 as a promising catalyst for selective hydrogenation of nitroarenes to corresponding aryl amines in the presence of Lewis acid
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The selective hydrogenation of nitroarenes to their corresponding aryl amines has been investigated over the supported nickel propoted tungsten carbide catalyst on polymeric mesoporous graphitic carbon nitride (Ni-W2C/mpg-C3N4) in the presence of Lewis acid. The Ni-W2C/mpg-C3N4 is demonstrated much higher catalytic activity and selectivity for the selective hydrogenation of nitrobenzene than the supported Ni-W2C catalyst on activated carbon (Ni-W2C/AC) and mesoporous carbon (Ni-W2C/CMK-3), and the developed Ni-W2C/mpg-C3N4 also exhibits excellent catalytic properties for the selective hydrogenation of various substrates comprising the extra reducible functionalized groups besides nitro group to diverse functionalized arylamines, industrially important compounds, offering more than 92% of yield with 100% selectivity, which may be ascribed to the strengthened mass transfer by using mesoporous support, intentified synergistic effect between Ni-W2C/mpg-C3N4 and Lewis acid owing to the basicity of mpg-C3N4, as well as the improved reducibility of NiO-WO3 and the dispersion of Ni-W2C. It can be also found that the developed catalyst could be easily recovered by filtration and recycled many times without visible loss in its catalytic performance. The significantly improved catalytic properties of supported Ni-W2C catalyst fabricated by using mpg-C3N4 as a superior carrier in the presence of Lewis acid allows it to be a promising candidate for the clean and highly-efficient synthesis of diverse functionalized arylamines through the selectivie hydrogenation of substituted nitroarenes.
- Zhao, Zhongkui,Yang, Hongling
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- Highly efficient N-doped carbon supported FeSx-Fe2O3 catalyst for hydrogenation of nitroarenes via pyrolysis of sulfurized N,Fe-containing MOFs
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Integrating MOFs as precursor, especially for employing N-containing organic linkers, with sulfides is an effective method to prepare the highly efficient N-doped carbon supported metal-based catalysts for hydrogenation of nitroarenes. In this work, a N,Fe-containing metal organic frameworks (MOFs; termed as MIL88-HMTA) with spindle-like structure was prepared via self-assembly method, in which hexamethylenetetramine (HMTA) linker was introduced as N source. Subsequently, N-doped carbon supported FeSx-Fe2O3 catalyst (named FeSx-Fe2O3@CN) was fabricated upon the pyrolysis of sulfurized MIL88-HMTA. Catalytic experiments reveal that the FeSx-Fe2O3@CN delivered excellent performance for hydrogenation of nitroarenes in comparison with those of catalyst without sulfidation process (Fe2O3@CN) and conventional MIL88 derived catalyst (Fe2O3@C). The XRD, TEM, SEM/EDX, Raman, UV, and XPS analyses have revealed that the developed FeSx-Fe2O3@CN catalyst exhibited outstanding catalytic efficiency was ascribed to synergistic effect between FeSx and Fe2O3 species, abundant structural defects, more Fe-Nx species, and strengthened decomposition ability of hydrazine hydrate (N2H4?H2O). Furthermore, the effect of sulfidation ratio (the mass ratio between thioacetamide and MIL88-HMTA) towards preparation of the developed FeSx-Fe2O3@CN on the catalytic activity of hydrogenation reaction was also systematically performed. Notably, the optimized catalyst (denoted as FeSx-Fe2O3@CN-8) exhibited unexpected performance and recyclability for hydrogenation of nitroarenes under mild condition. The pyrolysis of sulfurized N-containing MOFs may present a facile approach for fabricating MOFs-derived N-doped carbon supported catalysts, which provides a potential application in heterogeneous catalytic reactions.
- Li, Xuewei,She, Wei,Wang, Jing,Li, Weizuo,Li, Guangming
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- A highly efficient LaOCl supported Fe-Fe3C-based catalyst for hydrogenation of nitroarenes fabricated by coordination-assisted pyrolysis
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Bi-metal-organic framework (bi-MOF) derived carbon-based catalysts have exhibited considerable potential for hydrogenation reactions; however, designing suitable bi-MOFs to fabricate highly efficient catalysts is still a great challenge. Herein, an efficient LaOCl supported Fe-Fe3C-based carbon-nitrogen catalyst (Fe-Fe3C-LaOCl/CN-hmta) was first prepared by bi-MOF (La-salenFe@HMTA)-templated pyrolysis. La-salenFe@HMTAwas synthesizedviathe coordination-assisted method,e.g., it is prepared by the coordination of N from the rich free imine (-CHN-) groups located on the La-salen complex to the Fe3+ions from Fe@HMTA. Catalytic experiments reveal that Fe-Fe3C-LaOCl/CN-hmta as a hydrogenation catalyst exhibits excellent performance for hydrogenation of nitroarenes in comparison with catalysts derived from Fe-urea MOFs (Fe-Fe3C-LaOCl/CN-urea) and Fe(NO3)3·9H2O derived catalysts (Fe-Fe3C-LaOCl/CN). On the basis of the nature of Fe-Fe3C-LaOCl/CN-hmta and the reaction results, it is concluded that the unique catalytic efficiency of Fe-Fe3C-LaOCl/CN-hmta depends significantly on the synergistic effect of Fe and Fe3C, large specific surface area and abundant structural defects. This piece of research provides a new approach for preparing highly efficient and stable Fe-Fe3C-based catalysts for hydrogenation of nitroarenesviathe coordination-assisted pyrolysis (CAP) method.
- Li, Guangming,Li, Weizuo,Li, Xuewei,She, Wei,Wang, Jing
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p. 4627 - 4635
(2021/07/12)
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- Synthesis method of chloro-p-phenylenediamine
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The invention discloses a synthesis method of chloro-p-phenylenediamine. The synthesis method sequentially comprises the following steps: o-chloro-p-nitroaniline, metal alkoxide and alcohol as a solvent are added to a reactor to be mixed, and the mixture is heated to 100-190 DEG C for a reaction for 2-6 h; a reaction product is cooled to room temperature, the alcohol solvent in a reaction liquid is recovered by distillation, and a remainder after recovery of the alcohol solvent is a crude product of chloro-p-phenylenediamine. The chloro-p-phenylenediamine is synthesized with the method, so that an expensive catalyst is not used, the process is simple, few three wastes are caused, and the method has good industrial application values.
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Paragraph 0036-0070
(2019/07/04)
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- Unravelling 2-aminoquinazolin-4(3: H)-one as an organocatalyst for the chemoselective reduction of nitroarenes
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A novel, mild and transition metal-free, 2-aminoquinazolin-4(3H)-one-assisted reduction of nitroarenes employing hydrazine hydrate as reducing agent and potassium carbonate as a base is reported. For the first time, the activation of hydrazine hydrate with an organocatalyst has been explored for reduction reactions. Also for the first time, 2-aminoquinazolin-4(3H)-one and its derivatives have been investigated as hydrogen bonding organocatalysts for the reduction of nitroarenes to anilines. Sensitive functional groups such as sulfonamide, carboxyl, amide and halides were well tolerated in this green methodology with scalability and high chemoselectivity.
- Thakur, Maheshwar S.,Nayal, Onkar S.,Rana, Rohit,Kumar, Manoranjan,Sharma, Sushila,Kumar, Neeraj,Maurya, Sushil K.
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supporting information
p. 1373 - 1378
(2018/02/06)
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- Mechanochemical catalytic transfer hydrogenation of aromatic nitro derivatives
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Mechanochemical ball milling catalytic transfer hydrogenation (CTH) of aromatic nitro compounds using readily available and cheap ammonium formate as the hydrogen source is demonstrated as a simple, facile and clean approach for the synthesis of substituted anilines and selected pharmaceutically relevant compounds. The scope of mechanochemical CTH is broad, as the reduction conditions tolerate various functionalities, for example nitro, amino, hydroxy, carbonyl, amide, urea, amino acid and heterocyclic. The presented methodology was also successfully integrated with other types of chemical reactions previously carried out mechanochemically, such as amide bond formation by coupling amines with acyl chlorides or anhydrides and click-type coupling reactions between amines and iso(thio)cyanates. In this way, we showed that active pharmaceutical ingredients Procainamide and Paracetamol could be synthesized from the respective nitro-precursors on milligram and gram scale in excellent isolated yields.
- Portada, Tomislav,Margeti?, Davor,?trukil, Vjekoslav
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supporting information
(2018/12/11)
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- Gold nanoparticles anchored onto the magnetic poly(ionic-liquid) polymer as robust and recoverable catalyst for reduction of Nitroarenes
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Gold nanoparticles supported on poly ionic-liquid magnetic nanoparticles (MNP@PIL@Au) were synthesized by reduction of HAuCl4 with sodium borohydride. The synthesized catalyst was characterized using by AAS, TEM, FT-IR, EDS, TGA and XRD techniques. The performance of the synthesized catalyst was investigated in the reduction of nitroarenes with NaBH4. The reaction was carried out for various nitroarenes in water and mild conditions with high yields. The catalyst selectivity for the reduction of nitro group in the presences of other functional groups such as halides and alkynes was fairly well. The recycling of the catalyst was done 8 times without any significant loss of its catalytic activity.
- Moghaddam, Firouz Matloubi,Ayati, Seyed Ebrahim,Firouzi, Hamid Reza,Hosseini, Seyed Hassan,Pourjavadi, Ali
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- Kinetics of the hydrogenation of 2-chloro-4-nitroaniline over skeletal nickel and supported palladium catalysts in an aqueous solution of 2-propanol
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The kinetics of the liquid-phase hydrogenation of 2-chloro-4-nitroaniline in an aqueous solution of 2-propanol over skeletal nickel and supported palladium catalysts is studied. The selectivity of the reaction with respect to 2-chloro-1,4-phenylenediamine is determined. It is found that samples of supported palladium catalysts differ with respect to the amount of the active component and the nature of the support. Some of their structural characteristics are provided.
- Krasnov,Latypova,Lefedova,Sharonov, N. Yu.
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p. 455 - 459
(2017/03/09)
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- A 4, 4 - dimethoxy - 2, 2 - bipyridyl silver catalytic hydrogenation of aromatic nitro compound synthesis of aromatic amines (by machine translation)
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The invention discloses a 4, 4 - dimethoxy - 2, 2 - bipyridyl silver catalytic hydrogenation of aromatic nitro compound synthesis of aromatic amines, the method uses a cheap, easy synthesis of 4, 4 - dimethoxy - 2, 2 - bipyridyl silver as catalyst, in order to green, environmental protection, non-toxic as the hydrogen source, the aromatic nitro compound in the relatively mild reaction conditions, one-step reaction can synthesize aromatic amine. The invention has simple operation, catalyst is cheap and easy and small consumption, mild reaction conditions, to substrate demonstrates better functional group tolerant, high product yield, industrial manufacturing cost, it has very good application prospect. (by machine translation)
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Paragraph 0016; 0029; 0032; 0061; 0064
(2017/07/19)
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- Zwitterionic Surfactant stabilized palladium nanoparticles as catalysts in aromatic nitro compound reductions
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Palladium nanoparticles (NPs) stabilized by ImS3-14, a zwitterionic surfactant structurally related to ionic liquids, are revealed here to be good catalysts for the reduction of a large number of substituted aromatic nitro compounds. Our mass spectrometry results are consistent with the formation of amino products in a direct route, where the aromatic nitro compounds are initially reduced to nitroso compounds, which are then reduced to the hydroxylamine derivatives and finally to the anilines. Activation parameters showed that for most Pd catalysts reported in the literature, the mechanism seems to be similar, with lower enthalpy of activation (ΔH?) being compensated by more negative entropy of activation (ΔS?). As a result, the reaction is thermally compensated and the rate constants for most reactions rather similar. Furthermore, Pd NPs stabilized by ImS3-14 showed efficient catalytic activities for the reduction of aromatic nitro compounds, with high conversion and good selectivity even using very low loadings of metal.
- Souza, Franciane D.,Fiedler, Haidi,Nome, Faruk
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p. 372 - 381
(2016/03/19)
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- Robust and economic reduction protocol employing immensely stable and leach-proof magnetically separable nanocomposites
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Magnetically recoverable nanocomposites i.e. metal loaded over modified ferrite nanoparticles have been synthesized via a facile three step pathway. Modification of ferrite nanoparticles which serve as the core has been achieved using dopamine hydrogen chloride. Owing to this, introduction of terminal amine groups on the surface of ferrite nanoparticles takes place which provides binding sites for the stabilization of metal nanoparticles providing leach-proof nanocomposites. The synthesized nanocomposites have been characterized using various characterization techniques. Substantiation of the modification of the pristine magnetic ferrite nano particles has been done from the emergence of strong stretching vibration bands of N-H and O-H in the range of 3200-3400 cm-1, N-H stretching band in the range of 1630-1650 cm-1, C-C vibrations of the benzene ring in the range of 1480-1500 cm-1 and C-O stretching vibrations in the range of 1070-1100 cm-1. In the XRD patterns additional peaks corresponding to loaded metals (Cu and Ag) along with peaks corresponding to spinel ferrites have been observed confirming the successful formation of the composite. EDS patterns and FE-SEM elemental mapping confirmed the purity of the samples by displaying the absence of any impurity. Elemental mapping also confirmed the uniform binding of the loaded metals over the surface of modified ferrite nanoparticles. Catalytic efficiency of the synthesized nanocomposites has been explored for the reduction of nitroarenes. Both the Cu and Ag loaded samples exhibited excellent activity and efficient recyclability for the reduction of nitroarenes in the presence of NaBH4 as a reducing agent.
- Goyal, Ankita,Singhal, Sonal
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p. 91275 - 91294
(2016/10/11)
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- Nitrogen-doped carbon supported iron oxide as efficient catalysts for chemoselective hydrogenation of nitroarenes
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Chemoselective hydrogenation has been widely used in the production of fine chemicals, and developing heterogeneous catalysts with high activity and chemoselectivity is always a challenging topic. Herein, we report a new type of catalysts synthesized from biomass-derived chitosan and non-noble iron, which is denoted as nitrogen-doped carbon supported iron (Fe/N-C). TEM and XRD characterization indicate the presence of iron species. Interestingly, the Fe/N-C catalysts exhibited excellent catalytic performances in the hydrogenation of nitroarenes, and excellent yields of target aniline products could be obtained under industrially viable conditions.
- Xu, Shaodan,Yu, Deqing,Liao, Shangfu,Ye, Tao,Sheng, Huadong
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p. 96431 - 96435
(2016/10/25)
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- Facile protocol for reduction of nitroarenes using magnetically recoverable CoM0.2Fe1.8O4 (M = Co, Ni, Cu and Zn) ferrite nanocatalysts
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Transition metal doped cobalt ferrite (CoM0.2Fe1.8O4 (M = Co, Ni, Cu, Zn)) nanoparticles were fabricated using the sol-gel methodology. The obtained ferrite nanoparticles were annealed at 400 °C and characterized using Fourier transform infra-red spectroscopy (FT-IR), X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), vibrating sample magnetometry (VSM) and energy dispersive X-ray (EDX) and scanning transmission electron microscopy (STEM). In the FT-IR spectra two bands in the range 1000-400 cm-1 were observed corresponding to the M-O bond in the tetrahedral and octahedral sites. XRD patterns confirmed the formation of a cubic spinel structure with a Fd3m space-group. HR-TEM analysis revealed a quasi-spherical shape with particle sizes in the range 20-30 nm for all the synthesized ferrite nanoparticles. The lattice inter-planar distances of 0.29, 0.25, 0.21 and 0.16 nm obtained from HR-TEM corresponding to the (2 2 0), (3 1 1), (4 0 0) and (5 1 1) lattice planes respectively were in complete agreement with the XRD data. The EDX-STEM confirmed the elemental composition as per the desired stoichiometric ratio. The catalytic efficiency of the synthesized ferrite samples was explored for the reduction of nitrophenols. Cu substituted cobalt ferrite nanoparticles (CoCu0.2Fe1.8O4) possessed excellent catalytic activity while CoM0.2Fe1.8O4 (M = Co, Ni and Zn) were inactive for the same. The substrate scope of the developed protocol was also evaluated for the reduction of various CH3-, NH2-, Br-, Cl- etc. substituted nitroaromatic compounds.
- Goyal, Ankita,Kapoor, Surbhi,Samuel, Pankaj,Kumar, Vinod,Singhal, Sonal
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p. 51347 - 51363
(2015/06/25)
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- Metal-free transfer hydrogenation of nitroarenes in water with vasicine: Revelation of organocatalytic facet of an abundant alkaloid
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Vasicine, an abundantly available quinazoline alkaloid from the leaves of Adhatoda vasica, has been successfully employed for metal- and base-free reduction of nitroarenes to the corresponding anilines in water. The method is chemoselective and tolerates a wide range of reducible functional groups, such as ketones, nitriles, esters, halogens, and heterocyclic rings. Dinitroarenes reduced selectively to the corresponding nitroanilines under the present reaction conditions.
- Sharma, Sushila,Kumar, Manoranjan,Kumar, Vishal,Kumar, Neeraj
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p. 9433 - 9439
(2014/12/11)
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- Cobalt-modified molybdenum carbide as an efficient catalyst for chemoselective reduction of aromatic nitro compounds
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This work presents a facile and clean transformation for synthesizing diverse functionalized arylamines through chemoselective reduction reaction of their corresponding substituted nitroarenes catalyzed by the supported cobalt-promoted molybdenum carbide catalyst on modified activated carbon (Co-Mo2C/AC, AC is denoted as the modified activated carbon by H 2O2 oxidation treatment). Various characterization techniques including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma (ICP) and H2 temperature-programmed reduction (H2-TPR) were employed to reveal the relationship between catalyst nature and catalytic performance, and the plausible reaction mechanism is also proposed. The characterization results suggest that the addition of a small amount of transition metals, especially cobalt could significantly promote the formation of a perfect molybdenum carbide crystal phase, resulting in the improvement in catalytic properties of the supported molybdenum carbide catalyst. Reaction results demonstrate that the optimized Co-Mo2C/AC catalyst shows comparable catalytic performance towards precious metals for chemoselective reduction of various aromatic nitro compounds, affording 100% yield for all substrates involved in this work (99.3% of isolated yield for model substrate). Moreover, it can be found that the catalyst could be easily recovered by filtration and recycled without obvious loss in its catalytic properties. Therefore, the developed Co-Mo2C/AC catalyst in this work can be considered as an industrially viable and cheap candidate for clean and highly-efficient production of diverse functionalized arylamines.
- Zhao, Zhongkui,Yang, Hongling,Li, Yu,Guo, Xinwen
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supporting information
p. 1274 - 1281
(2014/03/21)
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- Mild and highly selective palladium-catalyzed monoarylation of ammonia enabled by the use of bulky biarylphosphine ligands and palladacycle precatalysts
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A method for the Pd-catalyzed arylation of ammonia with a wide range of aryl and heteroaryl halides, including challenging five-membered heterocyclic substrates, is described. Excellent selectivity for monoarylation of ammonia to primary arylamines was achieved under mild conditions or at rt by the use of bulky biarylphosphine ligands (L6, L7, and L4) as well as their corresponding aminobiphenyl palladacycle precatalysts (3a, 3b, and 3c). As this process requires neither the use of a glovebox nor high pressures of ammonia, it should be widely applicable.
- Cheung, Chi Wai,Surry, David S.,Buchwald, Stephen L.
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supporting information
p. 3734 - 3737
(2013/08/23)
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- Hydrous zirconia supported iridium nanoparticles: An excellent catalyst for the hydrogenation of haloaromatic nitro compounds
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Ir/ZrO2·xH2O was prepared by co-precipitation and characterized by TEM, XRD, and XPS. It showed an excellent catalytic performance for the hydrogenation of haloaromatic nitro compounds to the corresponding amines in the mixture solvent of ethanol and water. The catalyst gave both conversion and selectivity to be over 99.9% for the hydrogenation of p-chloronitrobenzene to p-chloroaniline. Besides the intrinsic characterization of iridium in the hydrogenation of haloaromatic nitro compounds, the high activity and selectivity of Ir/ZrO2·xH2O is probably attributed to the formation of hydrogen bond between substrate and the hydroxyl groups on the surface of the hydrous catalyst or solvent water to activate the N{double bond, long}O bond in nitro group. The activated N{double bond, long}O bond is easy to be attacked by the activated hydrogen, so the hydrogenation is promoted.
- Fan, Guang-Yin,Zhang, Lei,Fu, Hai-Yan,Yuan, Mao-Lin,Li, Rui-Xiang,Chen, Hua,Li, Xian-Jun
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scheme or table
p. 451 - 455
(2010/11/21)
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- 1,3-Dihydroxybenzene derivatives and colorants containing said compounds
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1,3-Dihydroxybenzene derivatives of general formula (I) or (Ia) or physiologically tolerated, water-soluble thereof wherein R′1 denotes substituted pyridyl group, a pyrimidyl group, a group of formula (IIa) or (IIIa) and the dyeing agents for keratin fibers containing these compounds.
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- Indium Mediated Reduction of Nitro and Azide Groups in the Presence of HCl in Aqueous Media
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Indium mediated reduction of azide and nitro groups in the presence of HCl (1.5 equiv based on indium) at room temperature in aqueous THF successfully provided the corresponding amine in high to quantitative yields. Under the some reaction conditions, selective reduction of azide and nitro group in the presence of vinyl group could be accomplished.
- Lee, Jung Gyu,Choi, Kyung Il,Koh, Hun Yeong,Kim, Youseung,Kang, Yonghan,Cho, Yong Seo
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- Process for dyeing keratinous fibers with aminoindoles and oxidation dye precursors at basic Ph's and dyeing agents
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The invention relates to a process for dyeing keratinous fibres, which consists in applying to these fibres a composition containing, in a suitable medium for dyeing, at least one coupler of formula: STR1 where R1 denotes hydrogen or alkyl, R2 and R3 denote hydrogen, alkyl, COOR' where R' is alkyl or hydrogen, at least one of the groups R2 and R3 denoting hydrogen, R4 denotes hydrogen, alkyl, hydroxyalkyl, polyhydroxyalkyl or aminoalkyl, Z1 and Z2 denote hydrogen, alkyl, hydroxyl, halogen, alkoxy, at least one of the groups Z1 and Z2 is other than hydrogen at least one oxidation dye precursor, at least one oxidizing agent, the pH of the composition applied to the fibres being higher than 7.
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- Methods for dyeing keratinous fibers with compositions which contain aminoindole couplers, oxidation dye precursors, and oxidizing agents at acid pHs
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A method for dyeing keratin fibers, wherein a composition is applied to said fibers which contains, in a suitable dyeing medium, at least one coupler having formula (I) STR1 wherein R1 is hydrogen or alkyl; R2 and R3 are hydrogen, alkyl, COOR', where R' is alkyl or hydrogen; R4 is hydrogen, hydroxyalkyl, alkyl, polyhydroxyalkyl or acetyl or aminoalkyl wherein the amine may be mono- or disubstituted by alkyl; Z1 and Z2 are hydrogen, alkyl, hydroxy, halogen, alkoxy or a salt thereof; at least one precursor of an oxidation hair dye; and at least one oxidizing agent, the pH of the composition applied to the fibers being less than 7.
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- 3-substituted para-aminophenols
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The invention concerns the use of a 3-substituted para-aminophenol as an oxidation dye precursor for dyeing keratinous fibres, in particular human hair. The 3-substituted para-aminophenol has formula: STR1 where R1 represents alkyl, alkenyl, mono- or polyhydroxyalkyl, nitrile, cyanoalkyl, halogenoalkyl, aminoalkyl or alkoxyalkyl and R2 represents hydrogen, alkyl or mono- or polyhydroxyalkyl, provided that when R2 is hydrogen R1 is not methyl or trifluoromethyl, and to addition salts thereof with an acid. The invention also concerns dye compositions containing compound (I). The invention further concerns novel 3-substituted para-aminophenols.
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- Process for dyeing keratinous fibers with 2,4-diamino-1,3-dimethoxybenzene at an acid ph and compositions employed
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Process for dyeing keratinous fibres, especially human keratinous fibres such as the hair, characterised in that a composition containing, in a medium suitable for dyeing, at least 2,4-diamino-1,3-dimethoxybenzene as a coupler; an oxidation dye precursor; and an oxidising agent; is applied to these fibres, the pH of the composition applied to the fibres being less than 7.
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- Process for dyeing keratinous fibres with oxidation bases combined with an iodide and dyeing composition employed
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A process for dyeing keratinous fibers employs a dye composition containing an oxidation base selected from a paraphenylenediamine, an N,N'-diphenylalkylene diamine, a para-aminophenol, an ortho-aminophenol, an ortho-phenylenediamine or a heterocyclic oxidation base, in combination with iodide ions. The application of this dyeing composition to the keratinous fibers is preceded or followed by the application to the fibers of a composition containing hydrogen peroxide.
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- Preparations containing substantive nitrodiphenylamine derivative hair dyes
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This invention encompasses preparations containing hair dyes of the formula STR1 wherein: one of R1 or R2 is a nitro and the other is --SO3 H; one of R3 or R4 is --NR6 R7 and the other is hydrogen, chlorine, or a C1-4 alkyl, and R6 and R7 are independently hydrogen, C1-4 alkyl, or C2-4 hydroxyalkyl; and R5 is hydrogen, chlorine, or a C1-4 alkyl; or a water soluble salt thereof; certain novel compounds within the above formula; and a method for dyeing hair.
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- Triazinyl reactive dyestuffs in which triazinyl group is further substituted with a beta-chloroethylsulfonyl- or vinylsulfonylbutyrylamino moiety
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Reactive dyes of the formula STR1 in which D is the radical of an organic dye of the monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthrone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide series, R is hydrogen or substituted or unsubstituted C1-4 -alkyl, X is a substituent which is detachable as an anion, B is a radical of the formula STR2 R1 and R2, independently of each other, are hydrogen or substituted or unsubstituted C1-4 -alkyl or phenyl, A is a substituted or unsubstituted aliphatic or aromatic bridge member, Y is a --CO--Z or --SO2 --Z radical, Z is an aliphatic, aromatic or heterocyclic reactive radical, and n is 1 or 2, are suitable for dyeing or printing cellulose-containing and nitrogen-containing materials and in high dyeing yield produce dyeings and prints having good fastness properties.
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- THE POLAROGRAPHIC AND VOLTAMMETRIC DETERMINATION OF 2-AMINO-5-SULPHOAMOYLNAPHTHALENE-AZO-(2'-CHLORO-4'-NITROBENZENE)
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The polarographic reduction of the title azo dye was studied, a mechanism was suggested and optomal conditions were determined for analytical utilization of this process.A detection limit of 3*10-7 mol l-1 was obtained using fast scan differential pulse voltammetry and 0.7*10-7 mol l-1 using linear potential scan voltammetry at a hanging mercury drop electrode.The detection limit can be decreased by adsorptive accumulation of the determined substance on the surface of hanging mercury drop electrode, to 1*10-8 mol l-1 for fast scan differential pulse voltammetry and 0.6*10-8 mol l-1 for linear scan voltammetry.The selectivity of the determination can be improved by preliminary separation by extraction or thin-layer chromatography.
- Barek, Jiri,Balsiene, Jana,Berka, Antonin,Hauserova, Ivana,Zima, Jiri
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- Nitrated coupler compounds useful in direct dyeing and simultaneous oxidation and direct dyeing of keratinic fibers
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A cosmetic composition for application to the hair contains either (a) at least one compound having the formula STR1 wherein: R is hydrogen, alkyl or halogen; and R' is hydrogen, alkyl, hydroxyalkyl, carbamylalkyl, mesylaminoalkyl, aminoalkyl, acylaminoalkyl, monoalkylaminoalkyl, dialkylaminoalkyl, piperidinoalkyl, morpholinoalkyl, carbamoyl, acyl or carbalkoxy; or (b) at least one of said compounds having formula I above and at least one benzene or heterocyclic oxidation base. The invention also relates to new couplers of formula I as well as to new indo compounds which result from the coupling of said compounds with an oxidation base. These cosmetic compositions for application to the hair are useful in direct dyeing, oxidation dyeing or simultaneous oxidation and direct dyeing of said hair.
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- Enzyme-activated oxidative process for coloring hair
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An enzyme-based oxidative process for coloring hair wherein the hair is exposed to a solution having a pH of about 4 to about 10 and containing hydrogen peroxide, soybean peroxidase enzyme and one or more oxidation dye precursors.
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