Russian Journal of Physical Chemistry A
·
2020
·Vol. 94
·期 13
·2742-2751
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IF 0.719
Xiaocong Li,Xu Li,Liu Guoji
Abstract The solubility of furaneol in 2-butanol, isopropanol, acetone, cyclohexanone, acetonitrile, 1,4‑dioxane, methyl acetate, n -propyl acetate, chloroform, dichloromethane, and DMF was measured by the equilibrium method under atmospheric pressure at temperatures ranging from 278.15 to 313.15 K. The solubility in experimental pure solvents increased with the increase of temperature. The solubility order of furaneol in selected pure solvents was DMF > chloroform > dichloromethane > 1,4-dioxane > isopropanol > propyl acetate > methyl acetate > cyclohexanone > acetone ≈ 2-butanol > acetonitrile. The experimental data were correlated by four thermodynamic models (Wilson, NRTL, modified Apelblat, and λ h ), all of the models can give a satisfactory correlation. In addition, mixed thermodynamic properties of Gibbs energy, enthalpy and entropy of furaneol in selected solvents were calculated based on Wilson model.
研究领域:
物理化学
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食品科学
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化工工程
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DOI
高影响因子
CHEMOSPHERE
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2022
·
IF 8.943
Nan Fang,Zhongbin Lu,Zhiguang Hou,Changpeng Zhang,Xueping Zhao
Flupyradifurone (FPO) easily spreads to the water environment after application because of its high solubility in water (3200 mg/L, 20 °C), but as a novel neonicotinoid pesticide , its environmental fate study is still lacking. Here, laboratory experiments were conducted to investigate the degradation kinetics and pathways of FPO in aqueous solutions and natural waters. The results showed that FPO was fairly stable in water under natural conditions (the hydrolysis half-lives at 15 °C, 25 °C, and 35 °C were >150 d, and the photolysis half-lives under sunlight were >168 h). However, FPO was photodegraded rapidly under ultraviolet (UV) light (half-lives of 2.37–3.81 min). Then, indirect photolysis under UV light was examined with the addition of photosensitizers, revealing that direct photolysis is the main FPO degradation pathway in water, and the contribution of indirect photolysis was limited. Moreover, two photoproducts were separated, purified and collected via preparative HPLC, and identified via high resolution mass spectrometry. Then, the plausible photolysis pathway was proposed. The results of this study will contribute to a better understanding of the fate of FPO in the water environment.
研究领域:
环境科学
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农药学
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DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2016
·
IF 3.389
Xiaomin Xiang,Bin Zhang,Guoqiang Ding,Jinglei Cui,Hongyan Zheng,Yulei Zhu
The oxidation of furfural in H 2 O 2 and H 2 O 2 –Mg(OH) 2 system were systematically investigated and a rational explanation for the reaction mechanism was proposed. 2-formyloxyfuran, from selective oxidation of HC O group in furfural, was a crucial intermediate. The addition of Mg(OH) 2 suppressed the oxidation of furan ring of furfural and enhanced selectivities of 2(5H)-furanone (44.8%) and succinic acid (38.0%). FT-IR, Gaussian calculation and experimental results indicated that the process of furfural oxidation with H 2 O 2 is homogeneous, and the synergy between dissolved Mg 2 + cations and OH − ions facilitates the HOO − attacking the carbon atom of HC O other than the C C bound of furan ring.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
·
2023
·Vol. 26
·期 8
·e202201497
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IF 2.8
Wenqian Du,Rongjie Yang,Jiawen Wu,Zhonghua Xia
Graphical Two flexible methods for synthesizing benzofuran-3(2H)-ones are developed, with easily available starting materials, good chemoselectivity, and very mild conditions. One protocol for benzofuranone is a gold-catalyzed cycloisomerization of o -alkynyl phenol with alcohol or acid. Another metal-free synthesis of benzofuranone is the treatment of benzofuran with alcohol, acid, or H 2 O. Benzofuranones are attractive synthetic targets in medicinal and natural products. The cycloisomerization of o -alkynyl phenol to benzofuran-3(2H)-one is reported here using gold(I) and Selectfluor. This benzofuranone can also be obtained from benzofuran without a gold catalyst. This study presents two appealing synthetic methods for benzofuran-3(2H)-ones that use readily available starting materials, have high chemoselectivity and operate under very mild conditions.
研究领域:
有机化学
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药物化学
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合成化学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2016
·
IF 4.312
Xiaodan Li,Xiaocheng Lan,Tiefeng Wang
The selective catalytic oxidation of furfural to 2(5H)-furanone, succinic acid (SA) and maleic acid (MA) was studied. Under optimized conditions, furfural was oxidized to 2(5H)-furanone with a yield of 60–62% in an aqueous/organic bi-phasic system using 1,2-dichloroethane or ethyl acetate as the solvent and formic acid as the catalyst, while the total yield of SA and MA was 15–20%. Compared with other homogeneous and heterogeneous acid catalysts, formic acid gave a much higher selectivity to 2(5H)-furanone because it reacted with hydrogen peroxide to generate performic acid that had a strong oxidizing nature and good solubility in both the aqueous and organic phases. The solvent had a significant influence on the product distribution. A simplified reaction network was established to quantitatively analyze the solvent effect based on the reaction rate constants. In the homogeneous system, the yield of 2(5H)-furanone decreased while the yield of SA increased with an increasing dielectric constant of the solvent. The formic acid/furfural molar ratio, reaction temperature and furfural concentration were optimized for the selective oxidation of furfural to 2(5H)-furanone in the bi-phasic reaction system.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2017
·
IF 3.648
Ruirui Xie,Hongjun Zang,Hongying Ding,Bing Yan,Bowen Cheng
Efficient molybdenum- and tungsten-based catalysts have been reported for the oxidation of furoin and 5,5′-dihydroxymethyl furoin (DHMF) to furil and 5,5′-bihydroxymethyl furil (BHMF), respectively. The catalytic oxidation reactions were performed using oxygen in air as the accelerator in acetic acid solvent. Under the optimized reaction conditions and by using tetra-hexadecyltrimethyl ammonium octamolybdate ([CTAB] 4 Mo 8 O 26 ) as a catalyst, excellent conversions to furil (~ 100%) and BHMF (~ 94%) were observed in a shorter reaction time compared to the other catalysts. This oxidation reaction has been performed by using acetic acid as a solvent under air for the first time, and the catalysts can be readily recycled with no noticeable loss in their catalytic activity over five consecutive catalytic cycles. In this manner, the catalytic system developed in this work is a greener and more environmentally benign process for the oxidation of furoin and DHMF.
研究领域:
有机化学
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环境科学
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2022
·
IF 8.129
Kun Yuan,Huangxian Zhang,Qiao Sun,Xiaohua Zhang,Dan Hou,Jing Chen,Changxiang Liu,Jinzhu Chen,Wanming Xiong
Biomass-based platform compound furfural can be upgraded to C 10 furoin, which is significant to the development and utilization of biomass energy . In this work, a series of diimidazole ILs were applied to explore a feasible way for upgrading of furfural to furoin. The results showed that the catalytic performance of diimidazole ILs were affected by the solvent and the structure of the anion and cation . Furoin yield could increase from 14.8% to 45.0% with the extension of the side chain, and it could be greatly enhanced by the transformation of ethyl group into unsaturated vinyl group. Theoretical calculations revealed it was due to the higher absorption energy and shorter distance between the di (vinylimidazole) ILs and furfural. Furthermore, the anion of diimidazole ILs also displayed influence by affecting the acidity and the electron distribution on the imidazole ring. Finally, the optimized yields of 84.4%, 82.0% and 84.8% were obtained by optimizing the BV 4 , FV 4 and SV 4 catalytic systems , respectively. Mechanistic studies suggested that C-2 deprotonation was the key to the reaction, and both the σ hyperconjugation and π-π conjugation with the imidazole ring could facilitated the reaction. This work may provide some reference in upgrading biomass energy
研究领域:
化学工程
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生物质能
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DOI
高影响因子
PEST MANAGEMENT SCIENCE
·
2021
·Vol. 77
·期 5
·2584-2590
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IF 4.845
Yingjie Wen,Huayue Meng,Chen Zhao,Fei Lin,Hanhong Xu
BACKGROUND Chemical control is the most used and effective method to control Diaphorina citri , the vector of the phloem-limited bacteria associated with citrus huanglongbing (HLB) disease. The objectives of this study were to determine the effectiveness of flupyradifurone applied via dripping irrigation systems on D. citri . Bioassays were conducted using leaves harvested on various dates post treatment, and insecticide residue in leaf tissue was quantified. RESULTS The drip application of flupyradifurone on citrus trees provided high-level and long-term control against D. citri adult, and the median lethal concentration (LC 50 ) for ingestion of flupyradifurone in D. citri was 22.22 mg kg –1 (fresh leaf). Flupyradifurone residue was detected in leaf tissue within 3 days after treatment. The measured level of flupyradifurone peaked on day 40 day after application, and then showed a steady decline in subsequent days for all three applied dosages. The amounts of flupyradifurone in upper, middle, and lower leaves were similar, and trends in the change in concentration of flupyradifurone were consistent. CONCLUSIONS The results demonstrate that flupyradifurone can be a valuable new tool for D. citri management programs, and drip-applied flupyradifurone provides an extended period of control efficacy. This paper could provide a reference to reduce the dependence on foliar-applied insecticides, with associated benefits for non-target exposure to workers and pollinators. © 2021 Society of Chemical Industry
研究领域:
植物保护
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农业昆虫学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2012
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IF 2.098
Lin Ma,Yunhui Sun,Duxia Cao,Huihui Chen,Zhiqiang Liu,Qi Fang
Three aurone derivatives, Z -2-[(4- N , N -dimethylaminophenyl)methylene] benzofuran-3-one ( 1 ), Z -2-[( N -ethylcarbazol-3-yl)methylene]benzofuran-3-one ( 2 ) and Z -2-[(pyren-1-yl)methylene]benzofuran-3-one ( 3 ) have been synthesized by the cyclization of 2′-hydroxychalcones. Their crystal structure, single- and two-photon related absorption and fluorescence properties have been examined. Pumped by 860 nm laser pulses in femtosecond regime, the compounds exhibit strong yellow–green two-photon excited fluorescence at 539 nm ( 1 ), 505 nm ( 2 ) and 524 nm ( 3 ) in THF with two-photon absorption (TPA) cross-section being 1536GM ( 1 ), 608GM ( 2 ) and 236GM ( 3 ).
研究领域:
有机化学
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材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·336
·
IF 3.504
Xiong Cao,Peng Deng,Shuangqi Hu,Lijun Ren,Xiaoxia Li,Peng Xiao,Yu Liu
The spherization of nanoenergetic materials is the best way to improve the sensitivity and increase loading densities and detonation properties for weapons and ammunition, but the preparation of spherical nanoenergetic materials with high regularization, uniform size and monodispersity is still a challenge. In this paper, nanoenergetic hollow spherical hexanitrostibene (HNS) derivatives were fabricated via a one-pot copolymerization strategy, which is based on the reaction of HNS and piperazine in acetonitrile solution. Characterization results indicated the as-prepared reaction nanoenergetic products were HNS-derived oligomers, where a free radical copolymerization reaction process was inferred. The hollow sphere structure of the HNS derivatives was characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), and synchrotron radiation X-ray imaging technology. The properties of the nanoenergetic hollow spherical derivatives, including thermal decomposition and sensitivity are discussed in detail. Sensitivity studies showed that the nanoenergetic derivatives exhibited lower impact, friction and spark sensitivity than raw HNS. Thermogravimetric-differential scanning calorimeter (TG-DSC) results showed that continuous exothermic decomposition occurred in the whole temperature range, which indicated that nanoenergetic derivatives have a unique role in thermal applications. Therefore, nanoenergetic hollow spherical HNS derivatives could provide a new way to modify the properties of certain energetic compounds and fabricate spherical nanomaterials to improve the charge configuration.Keywords:HNS;spherical nanoparticles;derivatives;hollow;sensitivity
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 16
·期 9
·4351-4358
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IF 6.852
Jihong Lan,Zhuqi Chen,Jinchi Lin,Guochuan Yin
Catalytic transformation of biomass-based furfural to value-added chemicals is an alternative route to the on-going fossil feedstock-based processes. This work describes catalytic aerobic oxidation of furfural to maleic anhydride, an important polymer starting material having a large market with H5PV2Mo10O40 and Cu(CF3SO3)2 catalysts. Under the optimized conditions, 54.0% yield of maleic anhydride can be achieved with about 7.5% yield of 5-acetoxyl-2(5H)-furanone formation. Notably, 5-acetoxyl-2(5H)-furanone is a highly value-added, biologically important intermediate that has been applied in pharmaceutical synthesis. The catalytic mechanism for furfural oxidation to maleic anhydride and 5-acetoxyl-2(5H)-furanone has been investigated in detail with identification of several key intermediates.
研究领域:
化学工程
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催化科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 22
·13660-13672
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IF 4.036
Xiaofan Zhang,Ming Gao,Tingting Liu,Huili Wang,Xuedong Wang
Herein, we fabricated three imidazolium-based polymeric ionic liquids (PILs) with different anions (P[VEIM]BF4, P[VEIM]PF6 and P[VEIM]Br), and analyzed their differential extraction efficiencies for bifenthrin through H-bonding induced effects. Three PILs all presented an irregular block structure with rough surface and lower specific-surface area (SSA, 11.2–18.7 m2 g−1) than carbon-based nanomaterials. They formed hydrogen bonds with free-water molecules in the lattice of PILs, including C2,4,5–H⋯O–H, Br⋯H–O–H⋯Br, O–H⋯Br, C2,4,5–H⋯F–P, P–F⋯H–O–H⋯F–P, C2,4,5–H⋯F–B and B–F⋯H–O–H⋯F–B. After extraction, the O–H stretching-vibration peak was prominently intensified, whereas the C–H bond varied slightly concomitant with reduced B–F and P–F vibration. Theoretically, the C–H vibration should become more intense in the C4,5–H⋯H2O and C2–H⋯H2O bonds after extraction in contrast to before extraction. These contrary spectral changes demonstrated that the hydrogen bonds between cations in the PILs and free-water molecules were broken after extraction, yielding the H-bonding occurrence between bifenthrin and H–O–H in the lattice. As a time indicator for the free-water binding and releasing process, the highest slope for the plot of It/I0 against time implied that the shortest time was required for P[VEIM]PF6 to reach an adsorption equilibrium. Overall, the strong hydrophobicity, small SSA and electrostatic-repulsion force for P[VEIM]PF6 are all not conducive to its efficient adsorption. Beyond our anticipation, P[VEIM]PF6 provided the highest extraction recovery for bifenthrin up to 92.4% among three PILs. Therefore, these data lead us to posit that the above high efficiency results from the strongest H-bonding effect between P[VEIM]PF6 and bifenthrin. These findings promote our deep understanding of PILs-triggered differential efficiency through a H-bonding induced effect.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）