824-39-5Relevant articles and documents
Catalytic applications of β-cyclodextrin/palladium nanoparticle thin film obtained from oil/water interface in the reduction of toxic nitrophenol compounds and the degradation of azo dyes
Zare Asadabadi, Azam,Hoseini, S. Jafar,Bahrami, Mehrangiz,Nabavizadeh, S. Masoud
, p. 6513 - 6522 (2019/05/10)
A supramolecular catalyst of Pd/β-cyclodextrin thin film is synthesized via a facile and one-pot procedure at an oil-water interface. Macrocyclic oligosaccharides of cyclodextrins with glucose units have a wide range of applications due to their hydrophobic and chiral interior. Due to the ability of this supramolecular catalyst to form inclusion complexes with small organic molecules, the as-synthesized catalyst was applied for the reduction of toxic nitroaromatic compounds (p, o, m-nitrophenol and 4-Cl-2-nitrophenol) and the degradation of harmful azo dyes (methyl orange and bismarck brown) with considerable results. This investigation illustrates the change of the catalyst properties in the presence of molecular receptors attached to the catalyst surface.
Synthesis and isolation of non-chromophore cage-rearranged silsesquioxanes from base-catalyzed reactions
Hanprasit, Sasikarn,Tungkijanansin, Nuttanee,Prompawilai, Arisa,Eangpayung, Supattra,Ervithayasuporn, Vuthichai
supporting information, p. 16117 - 16120 (2016/10/31)
The nucleophilicity of both ortho- and meta-nitrophenolate anions is strong enough to give substituted products, but their basicity also facilitates cage-rearrangement reactions in polyhedral oligomeric silsesquioxanes (POSS). Anions having a stronger basicity, but weaker nucleophilicity, such as CO32-, gave products only from cage-rearrangement, with the cage expansion products being isolable in multi-gram quantities using conventional column chromatography.
A process for the preparation of ortho-aminophenol
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Paragraph 0043; 0044, (2017/04/08)
The invention belongs to the technical field of a chemical industry, and particularly relates to a novel technology for preparing ortho-aminophenol. By adopting the novel technology for preparing the ortho-aminophenol disclosed by the invention, more 1.1-1.2 tons of elemental sulfur and 2 tons of sodium sulfate solid can be recovered from per 1 ton of ortho-aminophenol, a hydrogen sulfide gas can be obtained after acidification, sodium hydrosulfide is generated by virtue of an absorption tower to put into reproduction, 3-4% of solid waste can be obtained by using four-effect evaporation, and can be put into reproduction, the traditional technology can be used for purifying just by rectification, and the purity of the ortho-aminophenol can be improved by distillation firstly, so that the energy source and equipment are saved, the wastewater generated in the production process can be recycled, finally, wastewater is hardly generated, and impurities are also discharged and recycled in the process.
SYNTHESIS OF BAPTA-AM ANALOGUES CAPABLE OF ENHANCING THE VASCULAR PRODUCTION OF PROSTACYCLIN
Heilporn, S.,Broeders, F.,Daloze, D.,Braekman, J. C.,Boeynaems, J. M.
, p. 309 - 320 (2007/10/02)
About 30 analogues of BAPTA-AM, a potential antithrombotic agent, have been synthesized and tested for their effect on the production of prostacyclin.None of them was found to be a better enhancher of the production of prostacyclin by aortic endothelial cells than BAPTA-AM itself.The enhancing effect can be produced by compounds unable to chelate Ca2+, thus confirming that it is not related to their buffering capacity for free Ca2+.
Nadimido-substituted cyclophosphazene
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, (2008/06/13)
Disclosed are nadimido-substituted cyclophosphazene derivatives and thermosets thereof. The thermosets are useful as high temperature, flame resistant matrices for composites and as metal adhesives.
The Stereoselective Retardation of the Alkaline Hydrolysis of Organic Esters by Binuclear Cu(II) Complexes with Cyclodextrins
Matsui, Yoshihisa,Suemitsu, Daisuke
, p. 1658 - 1662 (2007/10/02)
The alkaline hydrolysis of p-nitrophenyl acetate (p-NPA) in 1.0 mol dm-3 NaOH at 25 deg C was almost completely retarded by the addition of a binuclear Cu(II) complex with α-cyclodextrin Cu2α-CD).The dissociation constant for an inclusion complex of Cu2α-CD with p-NPA was determined to be 0.059 mmol dm-3, which is about one 200th that for an inclusion complex of α-CD with p-NPA.The alkaline hydrolysis of o- and m-nitrophenyl acetates was also retarded by Cu2α-CD, though the extent of retardation was much less than that for p-NPA.A binuclear Cu(II) complex with β-cyclodextrin (Cu2β-CD) also caused a stereoselective deceleration of the alkaline hydrolysis of the esters.However, the stereoselectivity of Cu2β-CD was not so remarkable as that of Cu2α-CD.Dissociation constants for inclusion complexes of Cu2α-CD with several alcohols and other organic substrates were determined by the kinetic examination of the competitive inhibition effect of the substrates on the association of Cu2α-CD with p-NPA.Cu2α-CD formed stable inclusion complexes with such disk-like molecules as cyclohexanol, cycloheptanol, and p-nitrobenzyl alcohol.The geometry of a Cu2α-CD-p-NPA inclusion complex was presumed on the basis of these results.
A kinetic study of the H2O2-accelerated formation of o-nitrophenol from o-dinitrobenzene
Heller, Raymond A.,Fewster, Marilyn,Lambert, Tayler
, p. 2455 - 2460 (2007/10/02)
At 30 deg C in 50percent v/v dioxane in water, the reaction of o-dinitrobenzene with hydroxide ion to form o-nitrophenolate anion is very slow but it proceeds much more rapidly when H2O2 is also present.Although the phenolate product absorbs strongly in the visible region, standard kinetic analysis of the spectral data fails for both the peroxide-free and the peroxide-accelerated reactions.A more thorough examination of the spectral evidence reveals that, for the peroxide-accelerated reaction, a reasonably stable intermediate is first formed so that the overall reaction is in fact a two-step sequence.We have used a computer modelling technique to determine rate constants for the two steps and we find that both rate constants are dependent on .Several possible structures for the intermediate are discussed, with the radical anion being preferred.
Sulphinyl, Sulphonyl, and Sulphonium Groups as Leaving Groups in Aromatic Nucleophilic Substitutions
Chisari, Alfio,Maccarone, Emanuele,Parisi, Giovanni,Perrini, Giancarlo
, p. 957 - 960 (2007/10/02)
The kinetics of hydrolysis of mononitrophenyl sulphoxides, sulphones, and sulphonium methylsulphate by sodium hydroxide have been measured in 25percent aqueous dioxan.The mobility order of the leaving groups (+SMe2 >/= SO ca. SO2 for p-nitro-derivatives, and SO > SO2 for o-nitro-derivatives) are discussed in terms of electronic and steric effects.