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Showing papers on "Benzoic acid published in 2015"


Journal ArticleDOI
TL;DR: Pt3Ni octahedral nanoparticles supported on carbon black are prepared from solutions of Pt(acac)2 and Ni(acAC)2 in DMF and benzoic acid as structure directing agent as discussed by the authors.
Abstract: Pt3Ni octahedral nanoparticles supported on carbon black are prepared from solutions of Pt(acac)2 and Ni(acac)2 in DMF and benzoic acid as structure directing agent.

282 citations


Journal ArticleDOI
Weiping Deng1, Hongxi Zhang, Xuejiao Wu1, Rongsheng Li1, Qinghong Zhang1, Ye Wang1 
TL;DR: It is reported that cerium oxide-supported palladium nanoparticles (Pd/CeO2) can efficiently catalyze the one-pot oxidative conversion of 2-phenoxy-1-phenylethanol, a lignin model compound containing a β-O-4 bond and a Cα-hydroxyl group, in methanol in the presence of O2, producing phenol, acetophenone and methyl benzoate as the major products.

189 citations


Journal ArticleDOI
Minghui Tang1, Shanjun Mao1, Mingming Li1, Zhongzhe Wei1, Fan Xu1, Haoran Li1, Yong Wang1 
TL;DR: RuPd alloy nanoparticles (3.6 nm) uniformly dispersed on N-doped carbon were prepared via a simple ultrasound-assisted coreduction method in this paper, and the RuPd/CN is highly active, selective, and stable in the hydrogenation of benzoic acid to cyclohexanecarboxylic acid under mild conditions with a TOF up to 2066 h-1.
Abstract: RuPd alloy nanoparticles (3.6 nm) uniformly dispersed on N-doped carbon (RuPd/CN) was prepared via a simple ultrasound-assisted coreduction method. The RuPd/CN is highly active, selective, and stable in the hydrogenation of benzoic acid to cyclohexanecarboxylic acid under mild conditions with a TOF up to 2066 h–1. It was found that the bimetallic RuPd/CN catalyst exhibited a substantially enhanced activity in comparison with the monometallic catalysts (Ru/CN and Pd/CN). The reason for the higher performance of the RuPd/CN catalyst is considered to be the increased Ru0 /Run+ ratio induced by the electronic interaction between Ru and Pd, as evidenced by various characterizations. Notably, the different phenomenon of activity platform on different catalysts ascribed to the effect of hydrogen pressure was newly observed and further explained by first-principle studies. Moreover, the factors influencing the adsorption modes of BA, especially the configuration of the carboxyl group, have been investigated preli...

125 citations


Journal ArticleDOI
TL;DR: In this paper, the photocatalytic degradation of 4-methylbenzoic acid (MBA) and 2-chloro-5-nitro benzoic acids (CNBA) as aqueous solution mixture was studied using ZnO-SnO 2 /nano-clinoptilolite under UV irradiation.
Abstract: The photocatalytic degradation of 4-methylbenzoic acid (MBA) and 2-chloro-5-nitro benzoic acid (CNBA) as aqueous solution mixture was studied using ZnO–SnO 2 /nano-clinoptilolite under UV irradiation. The clinoptilolite nano-particles (CNP) were obtained via ball-mill method and ion exchanged in Zn 2+ –Sn 4+ aqueous solutions with different concentrations. The ion exchanged samples (Zn(II)–Sn(IV)/CNP) were calcined at 450 °C for 12 h to obtain ZnO–SnO 2 /CNP catalysts. XRD, DRS, FT-IR and TEM techniques were applied for characterization of samples. The experimental parameters which influenced degradation process were optimized and the optimum values were obtained as: 1 g L −1 of the photocatalyst, pH 5 and 5 mg L −1 of MBA and CNBA in the mixture. The degradation/ mineralization extents were confirmed by COD and HPLC.

107 citations


Journal ArticleDOI
TL;DR: In this paper, pyromellitic acid (PMA) intercalated layered double hydroxides ([Zn0.68Al0.32(OH)2]-PMA]0.08·0.3H2O, denoted as Zn2Al-PMA-LDHs) were synthesized and shown to possess a high selectivity (97.41% at pH 7.0) towards phosphate in a hybrid solution containing H2PO4−, SO42−, CO32−, NO3− and Cl−.

99 citations


Journal ArticleDOI
TL;DR: Orthogonality to halide-based cross-couplings is achieved by the use of diazonium salts, which can be coupled even in the presence of iodo substituents.
Abstract: In the presence of catalytic [{IrCp*Cl2 }2 ] and Ag2 CO3 , Li2 CO3 as the base, and acetone as the solvent, benzoic acids react with arenediazonium salts to give the corresponding diaryl-2-carboxylates under mild conditions. This C-H arylation process is generally applicable to diversely substituted substrates, ranging from extremely electron-rich to electron-poor derivatives. The carboxylate directing group is widely available and can be removed tracelessly or employed for further derivatization. Orthogonality to halide-based cross-couplings is achieved by the use of diazonium salts, which can be coupled even in the presence of iodo substituents.

96 citations


Journal ArticleDOI
Jidan Liu1, Lin Yu1, Shaobo Zhuang1, Qingwen Gui1, Xiang Chen1, Wenduo Wang1, Ze Tan1 
TL;DR: Copper-mediated direct ortho C-H bond sulfonylation of benzoic acid derivatives with sodium sulfinates was achieved by employing an 8-aminoquinoline moiety as the bidentate directing group.

92 citations


Journal ArticleDOI
TL;DR: It was found that hydroxyl substituted benzoic acid derivatives were weak inhibitors; however hydroxy or chloro substituted cinnamic acid and piperazine substituted derivatives were able to induce significant tyrosinase inhibition.

86 citations


Journal ArticleDOI
TL;DR: In this paper, the Diels-Alder reaction of furan and acrylic acid was run at 298 K and was catalyzed by Lewis acidic (Hf-, Zr-, and Sn-Beta) zeolite catalysts, and achieving a high turnover frequency (∼2 h −1) and no side reactions were observed.
Abstract: Routes to benzoic acid starting from furan—obtained from hemicellulose in high yield—and methyl acrylate are reported. These routes involve Diels–Alder and dehydration reactions of furan and acrylic acid (or methyl acrylate) in a two-step reaction protocol that minimizes side reactions. The Diels–Alder reaction of furan and methyl acrylate (or acrylic acid) was run at 298 K and was catalyzed by Lewis acidic (Hf-, Zr-, and Sn-Beta) zeolite catalysts, and achieving a high turnover frequency (∼2 h–1) and no side reactions were observed. The oxanorbornene product was dehydrated at low temperatures (298 to 353 K) in mixtures of methanesulfonic acid and acetic anhydride in 96% yield. This is compared to an only 1.7% yield of methyl benzoate obtained for the dehydration of the oxanorbornene in neat methanesulfonic acid. The effect of oxanorbornene concentration and stereochemistry was found not to decrease the yield of aromatics, while dehydration of the carboxylic acid form of the oxanorbornene led to a decreas...

83 citations


Journal ArticleDOI
Donggun Lee1, Sukbok Chang1
TL;DR: The Ir-catalyzed mild C-H amidation of benzoic acids with sulfonyl azides was developed to give reactions with high efficiency and functional-group compatibility, and the decarboxylation step was compatible with the amidation conditions, enabling a convenient one-pot, two-step process.
Abstract: The Ir-catalyzed mild CH amidation of benzoic acids with sulfonyl azides was developed to give reactions with high efficiency and functional-group compatibility. Subsequent protodecarboxylation of ortho-amidated benzoic acid products afforded meta- or para-substituted (N-sulfonyl)aniline derivatives, the latter being inaccessible by other CH functionalization approaches. The decarboxylation step was compatible with the amidation conditions, enabling a convenient one-pot, two-step process.

81 citations


Journal ArticleDOI
TL;DR: A new fluorescence probe was developed for hydrogen peroxide detection based on donor-excited photo induced electron transfer (D-PET) mechanism, together with the benzil as a quenching and recognizing moiety, and it exhibited high selectivity toward H2O2 over other reactive oxygen species and high sensitivity with a detection limit of 0.09 μM.

Journal ArticleDOI
TL;DR: The stoichiometric use of hydrogen peroxide in the presence of a selenium-containing catalyst in water is reported as a new ecofriendly protocol for the synthesis of variously functionalized carboxylic acids and esters.
Abstract: The stoichiometric use of hydrogen peroxide in the presence of a selenium-containing catalyst in water is here reported as a new ecofriendly protocol for the synthesis of variously functionalized carboxylic acids and esters. The method affords the desired products in good to excellent yields under very mild conditions starting directly from commercially available aldehydes. Using benzaldehyde as a prototype the gram scale synthesis of benzoic acid is described, in which the aqueous medium and the catalyst could be recycled at last five times while achieving an 87% overall yield.

Journal ArticleDOI
TL;DR: Ionic liquid 1-benzyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide can promote the generation of the ˙OOH free radical and thereby efficiently transformed the β-O-4 lignin model compound 2-phenoxyacetophenone into benzoic acid and phenol using O2 as the oxidant.

Journal ArticleDOI
TL;DR: In this paper, a tripodal tridentate copper(II) complex is synthesized to mimic the active site of copper enzymes that mediate the oxidation of aliphatic C-H bonds under mild condition.

Journal ArticleDOI
TL;DR: In this article, infinite dilution activity coefficients and gas-to-liquid partition coefficients were measured for acetone, methanol, acetonitrile, butyl acetate, pyridine, 2-propanol, and dichloromethane in 2-methoxyethanol based on headspace gas chromatographic method.

Journal ArticleDOI
TL;DR: The synthesis and crystal structures of twelve new compounds containing the UO22+ cation, a bromo-substituted benzoic acid linker and a chelating N-donor were reported in this article.
Abstract: The syntheses and crystal structures of twelve new compounds containing the UO22+ cation, a bromo-substituted benzoic acid linker (m-bromo-, p-bromo, or 3,5-dibromobenzoic acid) and a chelating N-donor (1,10-phenanthroline, 2,2′:6′,2′′-terpyridine, or 4′-chloro-2,2′:6′,2′′-terpyridine) are reported Single crystal X-ray diffraction analyses of these materials allowed for the exploration of the structural relationship between the benzoic acids and the chelating N-donor, as well as the influence of pH on uranyl speciation At an unadjusted pH (∼3) a mix of uranyl monomers and dimers are observed whereas at higher pH (5–6) uranyl dimers are usually produced with monomers and tetramers also observed A systematic study of the supramolecular interactions present in these materials was executed by varying the bromine position on the benzoic acid groups along with substituents on the chelating N-donor Assembly via halogen and hydrogen bonding interactions as well as π–π interactions, including four instances of uranyl oxo-functionalization via halogen bonding, was observed depending on the experimental conditions utilized

Journal ArticleDOI
TL;DR: In this paper, the transition metal-catalyzed oxidation of methylarenes is discussed, and the target products are benzaldehyde, benzoic acid, benzyl alcohol, etc.
Abstract: Oxidation is one of the fundamental transformations in organic synthesis. The selective oxidation of inert substrates is interesting and important. In this review, the transition metal-catalyzed oxidation of methylarenes is discussed. Benzaldehyde, benzoic acid, benzyl alcohol, etc., were produced as the target products. Copyright © 2014 John Wiley & Sons, Ltd.

Journal ArticleDOI
TL;DR: In this paper, the performance of 6 wt% MnOx/SBA-15 catalysts with different manganese content was studied for the selective oxidation of toluene by oxygen under solvent-free conditions.

Journal ArticleDOI
TL;DR: In this paper, the performance of modified vermiculite for batch adsorption of benzoic acid from aqueous solution was studied and the equilibrium data were well described by the Langmuir and Temkin equations.

Journal ArticleDOI
Jinjing Luo1, Jingjing Lu1, Qiang Niu1, Xiaobao Chen1, Zhongye Wang1, Jieru Zhang1 
15 Nov 2015-Fuel
TL;DR: In this article, the properties of surface oxygen-containing functional groups (SOFG) on activated carbons, and their effects on removal of gaseous mercury chloride (HgCl 2 ).

Journal ArticleDOI
TL;DR: In this article, a comprehensive study of the factors that affect the reduction of Fe(III) species, the rate limiting step in the Fenton reaction, was presented, which showed that salicylate-like benzoic acid derivatives form stable bidentate ferric complexes in aqueous solutions at pH 3.0 and significantly decreased the overall degradation rates by slowing down Fe(II) production through both dark and photo-initiated pathways.
Abstract: In the context of our work on the oxidative degradation of a series of hydroxyl derivatives of benzoic acid (HBAs) by Fenton-like and photo-Fenton processes, we present a comprehensive study of the factors that affect the reduction of Fe(III) species, the rate limiting step in the Fenton reaction. We have investigated: (i) the formation of Fe(III)–HBA complexes, (ii) the ability of these complexes to participate in reductive pathways, and (iii) the formation of intermediate products capable of reducing ferric species. The results show that salicylate-like HBAs form stable bidentate ferric complexes in aqueous solutions at pH 3.0 and that Fe(III) complexation significantly decreases the overall degradation rates in Fenton systems by slowing down Fe(II) production through both dark and photo-initiated pathways. Interestingly, in contrast to ferric complexes of aliphatic carboxylates that undergo a photo-induced decarboxylation upon excitation in the 300–400 nm wavelength range, ferric–salicylate complexes yield Fe(II) and hydroxyl radicals by oxidation of water molecules in the coordination sphere of the metal center. However, their efficiencies are significantly lower than that of the Fe(III) aqua complex. Moreover, Fe(III)–HBA complexes are inert upon excitation of the LMCT bands involving the organic ligand (i.e., 400–600 nm). As observed for other aromatic compounds, Fe(III)-reducing intermediates formed during the Fenton oxidation of HBAs play a key role in iron cycling. The analysis of the primary oxidation/hydroxylation products as well as Fe(III)-reduction studies showed that, among dihydroxy aromatic derivatives, hydroquinone-like structures were much more efficient than catechol-like structures for reducing Fe(III). Although all trihydroxy derivatives produced Fe(II), ring opening reactions prevailed under the conditions of the Fenton reaction. The results of our investigation on the Fenton oxidation of HBA derivatives show that, in each particular case, the complex interplay of the aforementioned factors should be carefully evaluated for developing optimal applications of Fenton processes at a technological level.

Journal ArticleDOI
TL;DR: It was found that the degradation of aromatic compounds follows the 2,3-dioxygenase pathway in this strain and that the batch transformations of benzoic acid with either fresh or adapted cells were limited to an initial concentration of 2.5 g/L of pollutant.

Journal ArticleDOI
TL;DR: This open-flask, metal-free reaction does not require anhydrous solvents, proceeds under mild conditions, and uses atmospheric oxygen as the oxidant to afford high yields of the 3-(arylsulfonyl)benzoic acid esters.

Journal ArticleDOI
TL;DR: The capacity of 100 yeast strains - isolated from grape musts and wines from the Istituto Sperimentale per l'Enologia collection - to produce benzaldehyde, benzyl alcohol and benzoic acid was verified by inoculation into a synthetic nutrient medium (MNS) as mentioned in this paper.
Abstract: The capacity of 100 yeast strains - isolated from grape musts and wines from the Istituto Sperimentale per l'Enologia collection - to produce benzaldehyde, benzyl alcohol and benzoic acid was verified by inoculation into a synthetic nutrient medium (MNS). Schizosaccharomyces and Zygosaccharomyces were strongest in producing benzaldehyde (maximal amount found 1200 µg/l) and benzyl alcohol (maximally 523 µg/l). Zygosaccharomyces was also most effective in the production of benzoic acid (maximally 536 µg/l), followed by Saccharomyces, Cryptococcus, Kloeckera and Torulaspora. The hypothesis was verified that yeasts can be an exogenous source of the benzyl alcohol oxidizing enzyme in grape musts and wines. Wine yeast strains of Saccharomyces spp., Zygosaccharomyces spp. and Schizosaccharomyces spp. fermenting MNS containing 150 g/l glucose, with benzyl alcohol added, transformed this into benzoic acid only when glucose was disappearing, but not into benzaldehyde. No difference was observed between aerobic and anaerobic fermentation conditions. The uptake of benzyl alcohol was rapid in fermentation essays in presence of only 10 g/l glucose and in assimilation essais performed in yeast nitrogen base broth with assimilable carbon compounds added. A catabolic repression by glucose appears likely. Botrytis cinerea was able to transform benzyl alcohol into benzaldehyde and benzoic acid on Czapek-Dox broth with 30 g/l sucrose added. Benzyl alcohol was transformed by wine yeasts into benzoic acid when the concentration of glucose in the mineral medium was less than 10 g/l, but no production of benzaldehyde was observed. A catabolic repression of this transformation by glucose is likely. Botrytis cinerea was able to produce benzaldehyde in a mineral medium with benzyl alcohol and sucrose added.

Journal ArticleDOI
TL;DR: In this article, the Abraham model correlations for solute transfer into 2-butoxyethanol were derived from the calculated partition coefficients and solubility ratios using standard thermodynamic relationships.

Journal ArticleDOI
TL;DR: In this article, a surface modified δ-MnO 2 with a hierarchical structure was synthesized via a hydrothermal redox reaction between toluene and KMnO 4.

Journal ArticleDOI
Shubo Deng1, Yue Bei1, Xinyu Lu1, Ziwen Du1, Bin Wang1, Yujue Wang1, Jun Huang1, Gang Yu1 
TL;DR: In this paper, the effect of co-existing organic compounds on PFOS adsorption followed the decreasing order of humic acid>1-naphthol>benzoic acid >phenol.
Abstract: Co-existing organic compounds may affect the adsorption of perfluorinated compounds (PFCs) and carbon nanotubes in aquatic environments. Adsorption of perfluorooctane sulfonate (PFOS), perfluorooctane acid (PFOA), perfluorobutane sulfonate (PFBS), and perfluorohexane sulfonate (PFH x S) on the pristine multi-walled carbon nanotubes (MWCNTs-Pri), carboxyl functionalized MWCNTs (MWCTNs-COOH), and hydroxyl functionalized MWCNTs (MWCNTs-OH) in the presence of humic acid, 1-naphthol, phenol, and benzoic acid was studied. Adsorption kinetics of PFOS was described well by the pseudo-second-order model and the sorption equilibrium was almost reached within 24 h. The effect of co-existing organic compounds on PFOS adsorption followed the decreasing order of humic acid>1-naphthol>benzoic acid>phenol. Adsorbed amounts of PFOS decreased significantly in the presence of co-existing or preloaded humic acid, and both adsorption energy and effective adsorption sites on the three MWCNTs decreased, resulting in the decrease of PFOS adsorption. With increasing pH, PFOS removal by three MWCNTs decreased in the presence of humic acid and phenol. The adsorbed amounts of different PFCs on the MWCNTs increased in the order of PFBS

Journal ArticleDOI
TL;DR: It is shown that pathogen adapted better to the accumulation of tobacco root exudates than antagonist, which might be the cause of tobacco bacterial wilt outbreak in mono-cropping system.

Journal ArticleDOI
TL;DR: Together HPLC-mass spectrometry revealed a reverse proportionality between the degradation time and molecular size of the organic substrates, which may be useful for tailoring optimum oxidative treatment of waters without accumulation of hazardous derivatives.

Journal ArticleDOI
TL;DR: DNA binding tests indicate the ability of 1-3 to modify the activity of cells and changes in fluorescent emission light of ethidium bromide in the presence of DNA suggest intercalation or electrostatic interactions into DNA for 1 and 3.