532-32-1Relevant academic research and scientific papers
Protein mediated synthesis of gold nanobiocatalyst by microwave: A high efficient catalytic activity for the selective oxidation of benzyl alcohol
Pandya, Alok,Sutariya, Pinkesh G.,Menon, Shobhana K.
, p. 78 - 83 (2013)
A simple, proficient, one-pot green chemical method for the biosynthesis of gold nanoparticles (AuNPs) with protein egg albumin by microwaves, which produce novel gold nanobiocatalyst (AuNBC) and it was characterized by FT-IR, UV-vis, TEM and DLS, which exhibited excellent stability over a wide range of pH and temperature. The catalytic activity of the as-synthesized AuNBC was quantified by synthesizing sodium benzoate from the one-pot oxidation of benzyl alcohol using gold nanobiocatalyst under microwave heating, which was stronger than AuNPs prepared by conventional chemical methods. The protocol is environmentally benign with non-toxic reagents, high recyclability and high efficiency.
Interaction of sodium titanate nanotubes with organic acids and base: Chemical, structural and morphological stabilities
Rodrigues, Carolina M.,Ferreira, Odair P.,Alves, Oswaldo L.
, p. 1341 - 1348 (2010)
This work reports the interaction of sodium titanate nanotubes (Na-TiNT) with aqueous solutions of benzoic and phenylphosphonic acids and of aniline. The Na-TiNT were obtained from hydrothermal treatment of TiO2 in aqueous NaOH solution. The results obtained from FTIR, XRD, TEM and elemental analyses showed that the chemical, structural and morphological stability of the nanotubes is related to the medium (acidic or basic) and to the treatment conditions (temperature and contact time). A titanium(IV) α- phenylphosphonate phase was obtained from interaction between Na-TiNT and phenylphosphonic acid. The amount and crystallinity of the new phase were dependent of the contact time and temperature, respectively. On the other hand, TiO2 or proton-rich titanate nanotubes were formed, depending on treatment conditions, from interaction between Na-TiNT and benzoic acid. When Na-TiNT interacted with aniline, no chemical, morphological or compositional change was observed.
Ion Binding and Micellar Effects upon Reactions of Carboxylic Anhydrides and Carbonate Esters
Al-Lohedan, Hamad,Bunton, Clifford A.
, p. 1160 - 1166 (1982)
Cationic micelles speed reactions of benzoic anhydride and bis(4-nitrophenyl) carbonate with hydroxide and carboxylate ion.With micellized cetyltrimethylammonium bromide (CTABr) the variation of the first-order rate constant, kψ, with can be fitted to the pseudophase ion-exchange model, but this model fails when the counterion of the surfactant is OH- or carboxylate ion.The variations of kψ with concentration of these reactive counterion surfactants fit a kinetic model in which the distribution of the nucleophilic anion between the aqueous and micellarpseudophases depends upon the concentration of nucleophilic ion.Despite the apparent differences between these two models, they predict similar values for the second-order rate constants of reaction of a given anion in the different types of micelles, and the implications of these findings to the interactions of micelles with counterions are discussed.
One-pot solvent-free synthesis of sodium benzoate from the oxidation of benzyl alcohol over novel efficient AuAg/TiO2 catalysts
Wang, Ying,Zheng, Jia-Min,Fan, Kangnian,Dai, Wei-Lin
, p. 1644 - 1647 (2011)
A novel green route to synthesize sodium benzoate from the one-pot oxidation of benzyl alcohol using air as the oxidant and AuAg/TiO2 as the catalyst under solvent-free conditions is presented. This process proceeds with advantages from the viewpoint of green chemistry due to non-toxic reagents, no waste emission and high recyclability of catalysts, which can retain high catalytic activity (yield > 75%) even after 6 runs.
Synergistic effect on Au-Pd bimetallic catalyst during oxidation of benzyl alcohol to sodium benzoate
Zhang, Zhaoyan,Wang, Ying,Li, Xian,Dai, Wei-Lin
, p. 1846 - 1857 (2014)
A series of AuPd/CeO2 bimetallic catalysts with different Au/Pd molar ratios were investigated and their catalytic performance in the oxidation of benzyl alcohol to sodium benzoate and benzoic acid under solvent-free conditions was studied. The supported catalysts were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The Au-Pd nanoparticles were successfully deposited onto CeO2 as a homogeneous alloy. The activity of the bimetallic catalysts was superior to that of the corresponding monometallic catalysts. This improvement was attributed to the synergistic effect between Au and Pd. The catalyst with an Au/Pd molar ratio of 3/1 showed the best catalytic performance (the yield of benzoic acid reached 92%), and it could be easily recovered and reused for more than seven successive reactions without significant loss of activity.
Synthesis of NHC Pincer Hydrido Nickel Complexes and Their Catalytic Applications in Hydrodehalogenation
Wang, Zijing,Li, Xiaoyan,Sun, Hongjian,Fuhr, Olaf,Fenske, Dieter
, p. 539 - 544 (2018/03/08)
The C(carbene)N(amino)N(amine)-pincer nickel(II) bromides 1a-c were hydrogenated to the corresponding nickel(II) hydrides 2a-c by (EtO)3SiH/NaOtBu or NaBH4. These nickel(II) hydrides 2a-c were characterized by NMR and IR spectroscopy as well as X-ray diffraction. The catalytic performance of complex 2b for hydrodehalogenation reactions was explored. With a combination of 3 mol % catalyst loading, (EtO)3SiH/NaOtBu/toluene/80 °C and different reaction times, organic halides were successfully reduced to the related alkanes. A catalytic radical mechanism is proposed and partially verified by experiments.
Sodium benzoate preparation method
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Paragraph 0009, (2017/05/12)
The present invention discloses a sodium benzoate preparation method, a product belongs to the field of food additives, and the product is prepared from raw materials including benzoic acid, a sodium hydroxide aqueous solution and activated carbon by neutralization reaction in a chemical reactor, active carbon decoloration, solid-liquid separation, drying and pulverizing. The production process is simple, investment in equipment used is less, sourced of the raw materials are rich, and the product sodium benzoate can be used as a preservative in food.
METHODS FOR PROCESSING MICROSPHERES, MICROSPHERES PROCESSED THEREBY, AND USES THEREOF
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, (2012/04/11)
The invention provides a manufacturing method for processing polymeric microspheres which are suspended in a liquid. The invention also provides polymeric microspheres produced by the method which can be used in medical settings as tissue fillers, tissue bulking agents, embolization agents, and/or as drug delivery agents.
Vibrational spectroscopic studies of cocrystals and salts. 3. cocrystal products formed by benzenecarboxylic acids and their sodium salts
Brittain, Harry G.
experimental part, p. 1990 - 2003 (2011/11/04)
X-ray powder diffraction, differential scanning calorimetry, infrared absorption spectroscopy, and Raman spectroscopy have been used to study the phenomenon of salt formation in four benzenecarboxylic acids (benzoic acid, phenylacetic acid, hydrocinnamic acid, and 4-phenylbutanoic acid), and in the 1:1 stoichiometric products formed by the cocrystallization of a free acid and a sodium salt. Assignments were derived for the observed peaks in both infrared absorption and Raman spectra of the reactants and their products. In all instances, it was observed that the energy of the antisymmetric stretching mode of the carbonyl group of the free benzenecarboxylic acid invariably shifted to higher energies when that acid formed a cocrystal with a sodium salt of another benzenecarboxylic acid. In addition, the symmetric stretching mode of the benzenecarboxylic acid carbonyl group disappeared in the Raman spectrum of its sodium salt and was also absent in the Raman spectrum of the cocrystal product. It was also found that the antisymmetric carboxylate anion stretching mode, the symmetric carboxylate anion stretching mode, the out-of-plane carboxylate deformation mode, and the vibrational modes associated with the phenyl ring and alkane side chains were not useful spectroscopic tools to differentiate cocrystal and sodium salt, as the observed differences of these vibrational modes did not exhibit significantly consistent differences between the various forms.
The advantage of covalent capture in the combinatorial screening of a dynamic library for the detection of weak interactions
Martin, Marco,Gasparini, Giulio,Graziani, Matteo,Prins, Leonard J.,Scrimin, Paolo
scheme or table, p. 3858 - 3866 (2010/09/05)
In this paper we address the advantage of screening a dynamic library by covalent capture in comparison with an approach in which the target is not covalently bound to the molecular receptor. The aim is the selection of recognition units for the binding of an anion (or polyanion) by relatively weak binding interactions, a situation typically found in supramolecular chemistry. To compare the two approaches, two model systems have been studied both based on the functionalization of a molecular platform, by reversible imine formation. In the case of the noncovalently bound substrate, the platform P1 is a trisubstituted benzene unit, 2,4,6-trimethylbenzene-1,3,5-tricarbaldehyde, to select: three recognition arms for the binding of the trisodium salt of benzene-1,3,5tricarboxylate. For the covalent-capture-based approach the platforms P2 and P4 are benzene derivatives with a tethered phosphonate target (tetrabutylammonium 2-formylphenyl ethylphosphonate) for the selection of a single recognition unit. The library of recognition elements comprises phenyl and ammonium-functionalized amines. We show that the selection of recognition units for the binding of the substrate with weak to medium, binding constants may encounter, by using a noncovalently bound substrate, serious problems. This is because the best conditions for the amplification of the library, that is, a large excess of variable recognition elements and target, lead also to competitive binding of the elements not bound to the platform, with the target. This may result in negligible amplification of the best-fit members of the library. In contrast, upon tethering the target to the platform and using the covalent-capture strategy for the selection of the recognition elements, significant amplification is observed, even for systems with much lower binding constants. Although competition with excess recognition units may also become an issue in the case of the tethered target, there is a way to overcome the problem by working at low concentrations.
