4876-10-2Relevant articles and documents
Influence of Oxidation of Pd/Al2O3 for the Reactions of CO with NH3 and Formamide Decomposition
Paul, D. K.,Worley, S. D.
, p. 8956 - 8959 (1990)
The reaction of CO with NH3 and the decomposition reactions for HNCO and formamide over Pd/Al2O3 films have been investigated by infrared spectroscopy.The formation of isocyanate species (NCO) was observed during all of these reactions over preoxidized Pd/Al2O3, but not over prereduced surfaces.These NCO species were formed Pd but spilled over to the Al2O3 support.Palladium became reduced during the course of the reaction of CO with NH3.A mechanism is proposed in which the reduction of Pdδ+ and the formation of a Pd formamide species are key features.
Infrared spectrum of solid isocyanic acid (HNCO): Vibrational assignments and integrated band intensities
Lowenthal,Khanna,Moore, Marla H.
, p. 73 - 78 (2002)
Characterization of infrared spectra thin films of solid HNCO condensed from the gas phase was reported. It was characterized in terms of integrated band intensities, vibrational frequencies and mode assignments. Reaction of Isocyanic acid with water (Hs
Dillard, J. G.,Franklin, J. L.
, p. 2353 - 2358 (1968)
Infrared Study of Ammonia-Carbon Monoxide Reaction on Silica-supported Iron Catalysts
Johnson, Colin,Jorgensen, Norman,Rochester, Colin H.
, (1988)
Infrared spectroscopy has been used to study the reaction of carbon monoxide and ammonia over Fe/SiO2 catalyst at ca. 298-723 K.Adatoms of nitrogen resulting from the dissociative adsorption of ammonia reacted with CO to form surface isocyanate on iron at
FORMATION OF ISOCYANATES ON NOBLE METALS AND SUPPORTED NOBLE METAL CATALYSTS.
Schuth,Wicke
, p. 813 - 819 (1988)
The formation of support-NCO and noble metal-NCO groups on oxide supported noble metal catalysts and high area evaporated metal films during the NO/CO reaction was studied by FTIR spectroscopy. With SiO//2 and Al//2O//3 as supports the results reported in the literature were essentially reproduced. With TiO//2 and ZrO//2 absorption bands in the region between 2000 and 2100 cm** minus **1 were detected, which had not been described before. On evaporated metals NCO-groups could be detected in situ. They are located at 2185 cm** minus **1 for Pd and at 2170 cm** minus **1 for Pt. Based on kinetic measurements the spillover of NCO-groups from the noble metal to the support is proposed as a mechanism for support-NCO formation.
Kitamura, Fusao,Takahashi, Machiko,Ito, Masatoki
, p. 62 - 66 (1987)
A Multifunctional Bimetallic Molecular Device for Ultrasensitive Detection, Naked-Eye Recognition, and Elimination of Cyanide Ions
Chow, Cheuk-Fai,Ho, Pui-Yu,Wong, Wing-Leung,Gong, Cheng-Bin
, p. 12984 - 12990 (2015)
A new bimetallic FeII-CuII complex was synthesized, characterized, and applied as a selective and sensitive sensor for cyanide detection in water. This complex is the first multifunctional device that can simultaneously detect cyanide ions in real water samples, amplify the colorimetric signal upon detection for naked-eye recognition at the parts-per-million (ppb) level, and convert the toxic cyanide ion into the much safer cyanate ion in situ. The mechanism of the bimetallic complex for high-selectivity recognition and signaling toward cyanide ions was investigated through a series of binding kinetics of the complex with different analytes, including CN-, SO42-, HCO3-, HPO42-, N3-, CH3COO-, NCS-, NO3-, and Cl- ions. In addition, the use of the indicator/catalyst displacement assay (ICDA) is demonstrated in the present system in which one metal center acts as a receptor and inhibitor and is bridged to another metal center that is responsible for signal transduction and catalysis, thus showing a versatile approach to the design of new multifunctional devices.
Shaw,Bordeaux
, p. 4729 (1955)
Photocatalytic oxidation of cyanide: Kinetic and mechanistic studies
Chiang,Amal,Tran
, p. 285 - 297 (2003)
The kinetics and mechanism of the photocatalytic oxidation of cyanide in the presence titanium dioxide catalyst were investigated in this study. By displacing the surface hydroxyl groups on the surface of titanium dioxide with fluoride ions, it was deduced that cyanide is oxidised via a pure heterogeneous pathway, i.e. oxidised by the holes trapped at the surface hydroxyl groups ≡TiO.. The quantum efficiency of the photocatalytic oxidation was found to be low (ca. 0.1-0.2%) and this was mainly due to (1) the low adsorption of cyanide ions onto the titanium dioxide surface, (2) the absence of homogenous reaction between cyanide ions and diffused hydroxyl radicals, and (3) the high electron hole recombination rate within the titanium dioxide photocatalyst. A kinetic model was developed to describe the mechanism involved in the photocatalytic oxidation of cyanide.
Lessing, Johannes G. V.,Fouche, Karel F.,Retief, Thomas T.
, (1977)
Click chemistry approach for the regioselective synthesis of iso-indoline-1,3-dione-linked 1,4 and 1,5 coumarinyl 1,2,3-triazoles and their photophysical properties
Anand, Ashish,Kulkarni, Manohar V.
supporting information, p. 722 - 733 (2017/03/27)
Copper-catalyzed reaction of N-propargyl isoindoline-1,3-dione and 4-azidomethyl coumarins / 4-azidomethyl-1-aza coumarins under click chemistry conditions afforded 1,4-disubstituted 1,2,3-triazoles, whereas ruthenium catalysis yielded isomeric 1,5-disubstituted 1,2,3-triazoles. The two regioisomers have been distinguished by NOE studies. UV absorption for a given pair of isomers exhibited similar trend, whereas fluorescence measurements showed considerable differences. Photo physical studies on the interaction of azides with copper and ruthenium have also been performed.
Environment-friendly synthetic method of 4-bromomethyl quinolinone
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Paragraph 0016; 0017, (2016/10/27)
The invention discloses an environment-friendly synthetic method of 4-bromomethyl quinolinone. The environment-friendly synthetic method comprises the following steps: adding acetoacetanilide bromide as a raw material into an anhydrous organic solvent; taking out moisture generated in reaction by virtue of the organic solvent as a water carrier while heating, condensing the moisture-containing organic solvent, adding the organic solvent into a reaction kettle filled with phosphorus pentoxide, and carrying out dehydration under stirring; continuously distilling the organic solvent in the reaction kettle filled with phosphorus pentoxide, returning the distilled anhydrous organic solvent to an acetoacetanilide bromide reaction kettle as the water carrier, carrying out dehydration cyclization on acetoacetanilide bromide so as to generate 4-bromomethyl quinolinone, cooling the system to the room temperature, carrying out filter pressing by directly utilizing a filter press, washing by virtue of an organic solvent, and drying, so as to obtain the product. According to the environment-friendly synthetic method, the yield of reaches 95% or above, and the purity of 4-bromomethyl quinolinone is more than or equal to 99.5%; and the product quality is good, waste acid and wastewater are not generated, the production efficiency is high, the cost is low, and large-scale production is easily realized.