ACS Omega
·
2024
·
IF 3.7
Dandan Jiang,Yingzhen Zhang,Xin Qiao,Jun Xiao,Kunming Liu,Juanhua Li,Jinbiao Liu
An iron-catalyzed selective N═S coupling of N-methoxy amides and sulfoxides has been developed and was found to be a highly efficient method for the synthesis of N-acyl sulfoximines. Electron-donating as well as electron-withdrawing groups on the phenyl ring are tolerated, and even sensitive substituents are compatible. The current catalytic transformation was conducted under an air atmosphere and can be easily scaled up to a gram scale with a catalyst loading of only 1 mol %. In this case, both coupling partners are used in their native forms, thus obviating prior functionalization and activation.
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PubMed
高影响因子
Processes
·
2023
·Vol. 11
·期 4
·1137
·
IF 3.5
Junliang Wang,Zhenzhen Zhang,Quanyuan Wang,Tianhong Lou,Zhiyan Pan,Mian Hu
Understanding the solubility of CO2is critical for implementing CO2-enhanced oil recovery (CO2-EOR). In this work, the solubility of CO2inn-decane in a temperature range between 303.15 K and 353.15 K and pressures up to 15 MPa was measured using a fused silica capillary cell with in situ Raman spectroscopy. A semi-empirical CO2solubility prediction model was obtained according to the experimental results. In order to improve the solubility of CO2inn-decane, the solubility of CO2inn-decane and co-solventn-hexane (3% wt) mixture was also comparatively investigated. The results indicated that the solubility of CO2inn-decane was 1.6355~64.0084 mol/kg. The data from the prediction model were in good agreement with the experimental data, and the mean relative deviation was 3.65%, indicating that the prediction model could be used to predict the solubility of CO2inn-decane under different conditions. The solubility of CO2inn-decane +n-hexane system ranged from 1.0127 mol/kg to 65.7286 mol/kg. It was found that, under low-pressure conditions, the addition of co-solventn-hexane did not enhance the solubility of CO2, while it had a certain enhancement effect on the dissolution of CO2under high-pressure conditions. As the temperature increased from 303.15 K to 353.15 K, the enhancement efficiency of the solubility of CO2also increased from 1.34~2.05% to 8.17~9.82%, and the average enhancement efficiency increased from 1.74% to 9.00%. This study provides more CO2solubility data for CO2-EOR.Keywords:CO2solubility;n-decane;n-decane +n-hexane;Raman spectroscopy
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Linlu Shen,Hongyi Wang,Jing Kang,Jimin Shen,Pengwei Yan,Yingxu Gong,Jiaxu Zhang,Gang Fu,Shuyu Wang,Yizhen Cheng,Shengxin Zhao,Zhonglin Chen
In this study, the ultraviolet/peroxymonosulfate (UV/PMS) process was found to be an efficient and safe strategy for simultaneously controlling NDMA during the degradation of N,N-dimethylhydrazine compounds, such as 1,1,1′,1′-Tetramethyl-4,4′-(methylene-di-p-phenylene) disemicarbazide (TMDS). The distinct roles of sulfate radicals (SO 4 − ), hydroxyl radicals (HO ), PMS, and UV in TMDS degradation as well as NDMA formation and elimination, have been elucidated, involving the kinetics and multiple-path transformation mechanisms. Moreover, to assess the feasibility of this process, a comprehensive toxicity assessment of treated water for zebrafish embryos was conducted. Mineralization analysis and an assessment of electrical energy per order (EE/O) were performed on actual water samples. The results indicate that SO 4 − , HO , PMS, and UV together degraded TMDS, but only SO 4 − and PMS led to NDMA formation. UV irradiation may coordinate SO 4 − and HO to overcome the energy barriers of NDMA elimination by providing continuous energy. The degradation of TMDS involved hydroxylation, radical addition, bond cleavage and nitrosation. Notably, NDMA formation may be closely related to the electron transfer between SO 4 − or PMS and TMDS. Subsequently, the generated NDMA was controlled through photocleavage, radical addition, and hydroxylation. Additionally, the results of toxicity evaluation and EE/O analysis suggest UV/PMS is safe and has the potential for treating N,N-dimethylhydrazine compounds-containing water.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Xuyang Yan,Jian Zhang,Yanru Zhu,Zhe An,Jing He
Heterogeneous Fe-based electro-Fenton process has gained extensive attention for the refractory pollutants control. Nevertheless, insufficient Fe II /Fe II I cycle is still the key limitation to enhance the Fenton reaction. Herein, a strategy on the efficient Fe II /Fe III internal cycle using CoFe II Fe III -layered double hydroxides (CoFe II Fe III -LDHs) has been proposed, in which Fe species are atomically-distributed facilitating the interfacial charge-transfer and redox response. In the degradation of N,N-dimethylacetamide (DMAC), a typical organic pollutant in wastewater derived from pharmaceutical production, acrylic fibers, electronic chemicals, and fine chemical industries, the critical factors influencing degradation of DMAC were examined in detail. The degradation efficiency and the catalyst stability were investigated. CoFe II Fe III -LDHs achieved a DMAC removal of 100% within 75 min with an apparent rate constant of 0.0594·min −1 and a TOC removal of 70% after 4 h under the condition of DMAC concentration (50 mg·L −1 ), pH value (pH = 4), current density (40 mA·cm −2 ), O 2 flow rate (40 mL·min −1 ), and catalyst dosage (1.6 g·L −1 ), and the DMAC removal remained >93% after five cycles, which were both considerably superior to that only containing Fe II or Fe III . Moreover, the main free radicals and degradation pathways were elucidated according to radical capture experiments and mass spectrometry. The strategy was well tolerated in treating various organic pollutants.
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Nature Communications
·
2026
·
IF 18.1
He Yingchun,Li Qing,Zhang Shao,Zhang Bo,Ma Dong-Dong,Wu Xin-Tao,Zhu Qi-Long
Electrosynthesis of N , N -dimethylformamide (DMF) combines sustainability with economic viability. However, its implementation is hindered by challenges in electrode engineering and reaction control. Herein, a redox-mediated domino electrosynthesis strategy is explored for efficient C–N coupling production of DMF over a binder-free single-molecule-integrated electrode engineered with designed cobalt phthalocyanines. This integrated electrode, featuring enhanced site accessibility and charge transfer capacity, exhibits high and selective methanol oxidation activity, initiating the domino process synergistically facilitated by in situ electrogenerated iodine as a redox mediator. The system operates stably at 50 mA cm –2 for over 150 h, achieving >90% Faradaic efficiency and a consistent DMF productivity of 839 μmol h –1 cm –2 . In a flow cell, pairing anodic DMF production with cathodic CO 2 -to-amide conversion yields industrial-scale DMF productivity up to 2.75 mmol h –1 cm –2 and gram-level amide-containing generic drug production at –200 mA cm –2 . Furthermore, comprehensive spectroscopic analysis and theoretical calculations elucidate a domino reaction sequence involving several key intermediates, namely *CH 2 O, iododiamine and iminium cation for DMF generation.
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高影响因子
Industrial Chemistry & Materials
·
2022
·Vol. 1
·期 2
·240-246
·
IF 0
Hui Cao,Mengyu Dou,Zexiang Lyu,Yingxiong Wang,Christian Marcus Pedersen,Yan Qiao
Carbazole and anthracene, two aromatic hydrocarbon components contained in coal tar, are used as essential organic intermediates to synthesize various carbazole derivatives and anthraquinones. N,N-Dimethylformamide (DMF) is a commonly used solvent to extract carbazole from crude mixtures of carbazole and anthracene. However, the interaction between carbazole/anthracene and DMF in the extraction process is still to be fully understood at the molecular level. In this work, the intermolecular interaction of carbazole/anthracene with DMF was investigated using various NMR techniques, including 1H NMR titration, variable temperature NMR spectroscopy (VT-NMR), Nuclear Overhauser Effect Spectroscopy (NOESY), and diffusion-ordered spectroscopy (DOSY). The observed 1H chemical shift changes of carbazole indicated strong intermolecular hydrogen bonds between carbazole and DMF, which was further supported by the decrease in the molecular self-diffusion coefficients (D) of both carbazole and DMF according to DOSY measurements. Moreover, NOESY experiments revealed that the distance between the aldehydic hydrogen of DMF and the N–H of carbazole was smaller than 5 Å. Accordingly, an intermolecular hydrogen bond between carbazole and DMF in the form of CO⋯H–N was proposed. This research increases our knowledge about the separation process of carbazole and anthracene and hence helps improve the methods.
Keywords: NMR; Carbazole; Separation; Intermolecular hydrogen bonds.
研究领域:
化学
·
有机化学
·
分析化学
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CATALYSIS TODAY
·
2012
·
IF 3.407
Anlian Zhu,Ruixia Liu,Lingjun Li,Liangyun Li,Lan Wang,Jianji Wang
In this work, the hydrogen bond formation ability of cation and anion of the ILs was determined by using the solvatochromic method and was found to be responsible for their catalytic activity in the Knoevenagel reactions. The enhancement in the hydrogen bond donor ability of the cations and the hydrogen bond acceptor ability of the anions can both lead to the increase in the catalytic activity of the ILs. From the proposed reaction mechanism, it was deduced that the cations of the ILs can form hydrogen bond with aldehyde to activate the C O bond as electrophile, and the anions of the ILs can promote active methylene compound to produce carboanion as nucleophile, showing dual function activation effect in the catalytic processes. In addition, the optimized N,N-dimethylethanolamnium acetate as dual function activator for the Koevenagel reactions benefits from wide substrates tolerance, ambient reaction temperature, easy work-up procedure, and easy reuse of the IL.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Yi-Cheng Geng,Xiang-Bing Li,An-Qi Wang,Bing-Yi Xi,Qian-Qian Zhang,Li-He Yan,Fa-Ming Li,Wei-Dong Zhu
Currently, triethylamine gas sensors based on semiconducting metal oxides generally suffer from issues such as high operating temperatures and relatively high detection limits (typically at the ppm level). To address the aforementioned issues, this study successfully synthesized GdVO 4 -In 2 O 3 composite materials using a two-step hydrothermal method. Benefiting from the formation of an n-n heterojunction and the introduction of oxygen vacancies, this composite material exhibits outstanding gas-sensing performance at lower operating temperatures. At an operating temperature of 80 °C, the sensor exhibits a response value of 5011 to 100 ppm triethylamine, representing 172.72 times and 43.35 times the response of pure GdVO 4 and In 2 O 3 , respectively. The operating temperature is correspondingly reduced by 68% and 55.56%. Additionally, the sensor exhibits a response value of 15.26 for triethylamine at concentrations as low as 50 ppb, with a linear fit determination coefficient of 0.995 within the 50–1000 ppb concentration range. Currently, research reports on GdVO 4 -based gas sensors remain limited. This study successfully synthesized GdVO 4 -In 2 O 3 composite materials for the first time, providing an effective solution for low-temperature detection of triethylamine at the ppb level while expanding the research framework for GdVO 4 -based gas sensors.
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POLYMER
·
2013
·Vol. 54
·期 18
·4902-4908
·
IF 3.379
Peng Liu,Wang Tang,Hailiang Zhang
A series of water-soluble thermoresponsive copolymers , i.e., poly[( N -isopropylacrylamide- co -bis( N -hydroxyisopropyl pyrrolidone) 2-vinylterephthalate] [P(NIPAm- co -HIPPVTA)], with well-defined comonomer content have been synthesized via conventional free-radical copolymerization at low conversion. The liquid crystalline behavior of the copolymers was investigated using polarized light microscope and differential scanning calorimetry . The results revealed that the P(NIPAm- co -HIPPVTA) exhibit liquid crystallinity when the NIPAm content is lower than 52.2 mol%, which was obviously different from that of previous papers. In addition, thermo-responsive behaviors of copolymer also demonstrated by dynamic light scattering . The cloud points of these copolymers can be tuned over a broad range (i.e., 9.9–81.2 °C) by simply altering the molar content of the HIPPVTA. It is noted that the cloud point of the copolymers showed unexpected trend (i.e., parabolicaly other than linearly or exponentially) with the increasing of HIPPVTA content. That is, with an increase of HIPPVTA molar content, the cloud point of copolymer decreases at first and then increases.
研究领域:
高分子化学
·
材料科学
·
温敏高分子
·
软物质物理
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高影响因子
KEY ENGINEERING MATERIALS
·
2012
·
IF 0
Xuan Min Zhu,Xiu Jian Zhao,Zhi Yong Ning,Xiao Tao Sui
Nanosized silver (Ag) was synthesized by reducing high concentration AgNO3 in N, N-dimethylformamide (DMF), in the presence of stabilizer polyvinyl pyrrolidone (PVP). PVP of two different molecular weights (MW=40000, 1300000) at the reaction temperature of 80°C and 100°C were tested for the effect on the formation of diverse silver nanoparticles. Our results indicated that the PVP with different molecular weights plays different role in the controlling of the Ag nanostructure owing to the PVP molecular selective adsorption on different crystal facets, thus affecting the growth rate of different facets of Ag nanoparticles. When all the other conditions kept the same and the temperature of 100°C, if PVP (Mw=40,000) was used, only a small amount of Ag decahedra were found. However, when the PVP with larger molecular weight such as PVP K88 (Mw=1300, 000), a large quantity of the triangular nanoprisms existed in the final solution in spite of the minority of quasi-sphere. The growth process and causation of different silver morphology with two distinct PVP have been briefly discussed.
研究领域:
纳米材料
·
纳米粒子合成
·
胶体化学
·
材料科学
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ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 3
·541-543
·
IF 0.3
Chuanguo Cui,Jinxiao Zhang,Zhiyin Xiao
C 61 H 50 Cl 2 Fe 2 I 12 N 12 , orthorhombic, Pbcn (no. 60), a = 13.0247(4) Å, b = 17.0204(5) Å, c = 34.1475(9) Å, β = 90, V = 7570.0(4) Å 3 , Z = 4, R gt
( F ) = 0.0694, wR ref
( F
2 ) = 0.1605, T = 293(2) K.
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高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Jun-lian WANG,Lu LIU,Guo-dong XU,Pei-long WANG,Guo-yong HUANG,Feng-shan YU
To seek more efficient extractant for Pd recovery from leaching solution of spent automotive catalysts, a new compound N-methyl-N-isopropyl octanthioamide (TA-813) was synthesized and characterized through FT-IR, 1 H NMR, ESI-MS and elemental analysis. Its extraction and stripping behaviors for Pd were studied. To evaluate its reusability performance, extraction−stripping cycles were carried out. Finally, TA-813 was applied to separating Pd from simulated leaching solution of spent automotive catalysts. TA-813 shows fast extraction kinetics, high extraction efficiency and specific selectivity for Pd. During extraction two TA-813 molecules coordinate with one Pd. The loaded Pd in the organic phase is efficiently stripped by neutral and acidic thiourea solutions. TA-813 shows no loss in activity after eight extraction−stripping cycles. Even from simulated leaching solution of spent automotive catalysts, in which the concentrations of some purities (La, Ce, Mg, Al) are much higher than that of Pd, Pd is still selectively extracted.
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