20734-68-3Relevant articles and documents
One-step facile synthesis of SnO2@Nd2O3 nanocomposites for selective amidol detection in aqueous phase
Rahman, Mohammed M.,Wahid, Abdul,Asiri, Abdullah M.,Awual, Md. Rabiul,Karim, Mohammad Razaul
, p. 4952 - 4959 (2020)
In this approach, amidol, a toxic organic chemical, is used as a staining developer electrochemically detected by using binary SnO2@Nd2O3 nanocomposites (NCs) by deposition onto a flat glassy carbon electrode (GCE). The NCs were prepared by a wet-chemical process followed by characterization with various conventional techniques, such as the UV-Vis, FTIR, XRD, FESEM, EDS and XPS techniques. During the electrochemical method, the main key points are the sensor analytical parameters, such as selectivity, sensitivity, linearity, concentration variations, validity, response time, and repeatability. The calibration curve was plotted in the full concentration range (FCR) from 0.1 mM to 0.1 nM. From the FCR, the linear dynamic range (LDR) was found in the range 1.0 mM to 0.1 nM. The sensitivity is calculated from the slope of the calibration plot in LDR, which was 158.228 μA μM-1 cm-2. The limit of detection (LOD) and limit of quantification (LOQ) of the fabricated chemical sensor were 0.06 nM and 0.2 nM. respectively. The binary doped NC-based chemical sensor probe is cheap, efficient, and environmentally friendly for detecting unsafe chemicals in the environmental and healthcare fields on a broad scale.
Commercially Available CuO Catalyzed Hydrogenation of Nitroarenes Using Ammonia Borane as a Hydrogen Source
Du, Jialei,Chen, Jie,Xia, Hehuan,Zhao, Yiwei,Wang, Fang,Liu, Hong,Zhou, Weijia,Wang, Bin
, p. 2426 - 2430 (2020/03/30)
Tandem ammonia borane dehydrogenation and nitroarenes hydrogenation has been reported as a novel strategy for the preparation of aromatic amines. However, the practical application of this strategy is subjected to the high-cost and tedious preparation of supported noble metal nanocatalysts. The commercially available CuO powder is herein demonstrated to be a robust catalyst for hydrogenation of nitroarenes using ammonia borane as a hydrogen source under mild conditions. Numerous amines (even sterically hindered, halogenated, and diamines) could be obtained through this method. This monometallic catalyst is characteristic of support-free, excellent chemoselectivity, low-cost, and high recyclability, which will favor its future utilization in preparative reduction chemistry. Mechanistic studies are also carried out to clarify that diazene and azoxybenzene are key intermediates of this heterogeneous reduction.
A chemo-enzymatic expeditious route to racemic dihexanoyl (2R*,3R*,4R*)-dehydroxymethylepoxyquinomycin (DHMEQ), the precursor for lipase-catalyzed synthesis of the potent nuclear factor-κB inhibitor, (2 S,3S,4 S )-DHMEQ
Kobayashi, Ryohei,Hanaya, Kengo,Shoji, Mitsuru,Sugai, Takeshi,Umezawa, Kazuo
, p. 1220 - 1223,4 (2020/08/31)
In order to synthesize the potent nuclear factor (NF)- κB inhibitor, (2S ,3 S ,4 S )-dehydroxymethylepoxyquinomycin (DHMEQ), in a large scale, a new route for its corresponding racemic precursor, dihexanoyl (2R*,3R*, 4R*)- DHMEQ, was developed. By employi
Processes and intermediates for the preparation of N4-phenyl-quinazoline-4-amine derivatives
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Page/Page column 62, (2009/09/05)
This invention provides compounds of Formula (I), wherein B, G, A, E, R1, R2, R3, m and n are as defined herein, which are useful as type I receptor tyrosine kinase inhibitors, and methods of use thereof in the treatment of hyperproliferative disorders in mammals.
One step hair coloring compositions using salts
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, (2008/06/13)
A hair coloring composition comprising the following two compositions which are mixed just prior to application to the hair: (a) a composition comprising a water-soluble peroxygen oxidizing agent; and (b) a composition comprising one or more oxidative hair coloring agents selected from the group consisting of an aromatic diamine, an amino phenol, a naphthol, a polyhydric phenol, a catechol and mixtures thereof; wherein the composition comprising one or more oxidative hair coloring agents further comprises al least one water soluble carbonate releasing salts; and optionally a water soluble ammonium salt, is described.
Transition metal complexes as dye forming catalysts in hair coloring compositions
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, (2008/06/13)
A hair coloring composition comprising a first composition which comprises: (a) a dye forming transition metal salt or complex; which is first applied to the hair; and a second composition which comprises the following two compositions which are mixed just prior to application to the hair: (a) a composition comprising a water-soluble peroxygen oxidizing agent; and (b) a composition comprising one or more oxidative hair coloring agents selected from the group consisting of an aromatic diamine, an aminophenol, a polyhydric phenol a catechol and mixtures thereof.
Enhanced color deposition for hair with sequestering agents
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, (2008/06/13)
Hair coloring compositions which comprise: (A) non-nitrogenous chelating agents from the group consisting of polyphosphate; phosphonates; hydroxycarboxylates; polyacrylates; zeolite; and mixtures thereof; (B) an oxidative dye primary intermediate; and (C) an oxidative dye coupler; (D) and water are described. The present invention also relates to a method for coloring hair which comprises contacting said hair with a hair coloring composition as described above.
Cyan dye-forming couplers and photographic elements and processes
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, (2008/06/13)
Cyan dye-forming 6-hydroxy-2H-1,4-benzoxazin-3-(4H)-one couplers, preferably cyan dye-forming couplers corresponding to the general formula: STR1 wherein R represents hydrogen or R"'--X--NH, R' represents hydrogen or a substituted or unsubstituted alkyl group, R" represents hydrogen or Riv --X--, X represents a member selected from the group consisting of --CO--, --SO2 --, --OCOCO--, --NHCO--, R"' and Riv represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group and Y and Z, the same or different, represent hydrogen, halogen and a substituted or unsubstituted alkyl or alkoxy group, are described for use in silver halide color photographic processes and elements.
Enzyme-activated oxidative process for coloring hair
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, (2008/06/13)
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.