MOLECULAR DIVERSITY
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2022
·Vol. 27
·期 2
·873-887
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IF 3.364
Fu Jiaxu,Yue Yuandong,Liu Kejun,Wang Shuang,Zhang Yiliang,Su Qing,Gu Qiang,Lin Feng,Zhang Yumin
Herein, we developed a convenient and efficient method via protonation of p -toluenesulfonic acid promoted cyclocondensation of o -phenylenediamine and aldehydes for selectively synthesizing 1,2-disubstituted benzimidazoles. This method displayed broad substrate adaptability and afforded the desired products in moderate to excellent yield in short reaction time. The effect of different substituents on the yield was investigated by extending optimum reaction conditions, which was further confirmed by theoretical calculations. It suggested that the surface electrostatic potential of oxygen atom and nitrogen atom on the substrates played important role in the synthesis of 1,2-disubstituted benzimidazoles. Besides, the crystal structure of compound 2t in the orthorhombic space group P2(1)/c was presented. Also, the anti-mycolicibacterium smegmatis (MC2155) activity was evaluated using rifampicin as a positive control. The products (2a, 2b, 2c, 2i, 2j, 2k, 2m) showed good antibacterial activities which were comparable to rifampicin. Graphical abstract
研究领域:
有机化学
·
药物化学
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合成化学
·
药学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongye Li,Jingyu Tan,Song Yang,Yapeng Sun,Huangzhong Yu
Two-dimensional (2D) materials have attracted attention due to their excellent optoelectronic properties, but their applications are limited by their defects and vacancies. Surface modification is an effective method to restore their performance. Here, ZrSe2 is modified with conductive polymer p-toluenesulfonic acid (PTSA). It is found that PTSA can obtain electrons of ZrSe2 through the combination of −SO3H and ZrSe2, thus forming interfacial dipoles, which improve the work function of ZrSe2. In addition, −OH in PTSA can effectively fill the Se vacancy in ZrSe2 to form P-type doping, thereby improving its conductivity. ZrSe2 modified by the PTSA material is first used as a hole transport layer (HTL) in organic solar cells (OSCs). The efficiency of OSCs based on the PBDB-T:ITIC and PM6:L8-BO binary active layer with ZrSe2:PTSA as the novel HTL reaches 10.66 and 18.14%, which are obviously higher than the efficiency of OSCs with pure ZrSe2 as the HTL (8.48 and 15.64%). More interestingly, the stability of the device with ZrSe2:PTSA as HTL is significantly better than that of PEDOT:PSS. This study shows that the modification of the organic material can effectively improve the photoelectric performance of ZrSe2 and explores the physical mechanism of the interaction between the organic modifier and 2D materials.
研究领域:
材料科学
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光电化学
✓ 已验证
DOI
PubMed
高影响因子
Energy Technology
·
2016
·Vol. 5
·期 5
·747-755
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IF 2.557
Tingwei Zhang,Wei Fan,Wenzhi Li,Zhiping Xu,Haosheng Xin,Mingxue Su,Yijuan Lu,Longlong Ma
Sn-β zeolite and PTSA–POM, made from the copolymerization of p -toluenesulfonic acid (PTSA) and paraformaldehyde (POM), were used for the production of 5-(hydroxymethyl)furfural (HMF) from glucose in an environmentally friendly solvent system including γ-valerolactone (GVL) and H 2 O. The effects of reaction temperature, reaction time, solvent, and catalyst-to-reactant ratio on the production of HMF were investigated. The combination of the Brønsted acid and Lewis acid catalysts largely improved the catalytic system and resulted in the production of HMF in 60.1 % yield at 140 °C in 30 min. The presence of water in the solvent had a positive influence on the production of HMF from glucose. The combination of the two catalysts also improved the catalytic performance for the production of HMF from cellulose and corn stalk.
研究领域:
化学工程
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可再生资源转化
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2018
·Vol. 65
·期 2
·675-683
·
IF 3.326
Hao Qin,Zhen Song,Qian Zeng,Hongye Cheng,Lifang Chen,Zhiwen Qi
The traditional production of long-chain organic esters like isobutyl isobutyrate (BIBE) suffers from severe problems due to the homogenous catalyst in process and complex system thermodynamics. In this work, an innovative bifunctional deep eutectic solvent (DES) is introduced, playing as both reaction catalyst and extraction solvent, to intensify the esterification process. The DES was formed by imidazole (Im) and p -toluenesulfonic acid (PTSA), which was for the first time found acid–base tunable, represented by weak basic DES [3Im:PTSA] and strong acidic DES [Im:2PTSA]. The formation mechanisms of [3Im:PTSA] and [Im:2PTSA] were illustrated by Fourier-transform infrared spectroscopy (FTIR) and COnductor-like Screening MOdel for Real Solvent (COSMO-RS) combined with the Im-PTSA phase diagram. The dual functions of the acidic [Im:2PTSA] in reactive extraction were evaluated by σ -potential analysis and esterification experiments. The high conversion, easy product separation, and good solvent reusability confirm the excellent catalytic and solvent effect of [Im:2PTSA]. © 2018 American Institute of Chemical Engineers AIChE J , 65: 675–683, 2019
研究领域:
化学工程
·
有机合成
✓ 已验证
DOI
高影响因子
Small
·
2026
·
IF 11.8
Longlong Qin,Liang Liu,Shengxiang Huang,Xiaohui Gao,Lianwen Deng
Construction of acid-doped polyaniline films with excellent dual-band modulation ability remains extremely challenging. Herein, graphene quantum dots (GQDs) and p-toluenesulfonic acid ( p TSA) are co-doped in electrodeposited polyaniline (PANI) films, transforming the compact PANI layer into an interconnected porous network. The reconstructed morphology facilitates electrolyte accessibility and shortens ion-transport pathways, while the interfacial interactions among GQDs, p TSA, and PANI promote localized charge redistribution and charge transport. These synergistic morphological and electronic effects contribute to accelerated electrochemical kinetics and enhanced electrochromic performance. The optimized film exhibits a maximum optical contrast (ΔT) of 47.6% at 667 nm and a high coloration efficiency of 203.2 cm 2 C −1 in the potential range from −0.2 to +0.3 V. Meanwhile, a broad infrared emissivity modulation range (Δε) and a maximum temperature tunable range was obtained as 0.71°C and ±8°C, respectively. Furthermore, an interpretable machine-learning framework integrating composition, morphology, and transport descriptors was established for multi-property prediction and composition screening, with its predictive capability further evaluated by independent blind validation. The results reported in this work provide an effective strategy and concept for advanced electrochromic materials toward applications in smart windows and adaptive thermal management systems.
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 8
·2208
·
IF 4.412
Muhammad Sajid,Muhammad Rizwan Dilshad,Muhammad Saif Ur Rehman,Dehua Liu,Xuebing Zhao
Furfural is one of the most promising precursor chemicals with an extended range of downstream derivatives. In this work, conversion of xylose to produce furfural was performed by employingp-toluenesulfonic acid (pTSA) as a catalyst in DMSO medium at moderate temperature and atmospheric pressure. The production process was optimized based on kinetic modeling of xylose conversion to furfural alongwith simultaneous formation of humin from xylose and furfural. The synergetic effects of organic acids and Lewis acids were investigated. Results showed that the catalystpTSA-CrCl3·6H2O was a promising combined catalyst due to the high furfural yield (53.10%) at a moderate temperature of 120 °C. Observed kinetic modeling illustrated that the condensation of furfural in the DMSO solvent medium actually could be neglected. The established model was found to be satisfactory and could be well applied for process simulation and optimization with adequate accuracy. The estimated values of activation energies for xylose dehydration, condensation of xylose, and furfural to humin were 81.80, 66.50, and 93.02 kJ/mol, respectively.Keywords:catalysis;chlorides;furfural;kinetics;lewis acid;p-toluenesulfonic acid;xylose
研究领域:
化学工程
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催化科学
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生物质转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2023
·
IF 3.6
Zi-Heng Zhang,Li-Jun Han,Shuang-Shuang Ma,Yi-Ran Du,Zheng-Kun Yu,Jin-Qing Lin,Bao-Hua Xu
The Pd(cod)Cl2-catalyzed alkoxycarbonylation of conjugated dienes to β,γ-unsaturated esters was approached by both intramolecular phosphinesulfonate L1 and intermolecular PPh3/PTSA in this study. However, the poor solubility of the Pd/L1 complex and the labile monodentate Pd/PPh3 structure restricts the system efficiency, especially for the scale-up application. By contrast, the stable and well-soluble bidentate Xantphos system allows for the quantitative formation of 3-pentenoate (96%) on a gram scale within 6 h in weakly alkaline N-methylpyrrolidone (NMP), which also functions as a basic site to promote the rate-limiting alcoholysis step while reducing the dosage of ligand to a theoretical value.
研究领域:
有机化学
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催化
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 20
·期 20
·2307386
·
IF 13.3
Shiting Wu,Xiaohui Li,Jiaqi Liu,Hanfeng Wu,Hanshuai Xu,Wangfeng Bai,Liang Mao,Xiaowei Shi
Selective photocatalytic production of high-value acetaldehyde concurrently with H 2 from bioethanol is an appealing approach to meet the urgent environment and energy issues. However, the difficult ethanol dehydrogenation and insufficient active sites for proton reduction within the catalysts, and the long spatial distance between these two sites always restrict their catalytic activity. Here, guided by the strong metal-substrate interaction effect, an atomic-level catalyst design strategy to construct Pt-S 3 single atom on ZnIn 2 S 4 nanosheets (Pt SA -ZIS) is demonstrated. As active center with optimized H adsorption energy to facilitate H 2 evolution reaction, the unique Pt single atom also donates electrons to its neighboring S atoms with electron-enriched sites formed to activate the O─H bond in * CH 3 CHOH and promote the desorption of * CH 3 CHO. Thus, the synergy between Pt single atom and ZIS together will reduce the energy barrier for the ethanol oxidization to acetaldehyde, and also narrow the spatial distance for proton mass transfer. These features enable Pt SA -ZIS photocatalyst to produce acetaldehyde with a selectivity of ≈100%, which will spontaneously transform into 1,1-diethoxyethane via acetalization to avoid volatilization. Meanwhile, a remarkable H 2 evolution rate (184.4 µmol h −1 ) is achieved with a high apparent quantum efficiency of 10.50% at 400 nm.
研究领域:
材料科学
·
催化化学
·
能源转化
✓ 已验证
DOI
高影响因子
Waste and Biomass Valorization
·
2020
·Vol. 12
·期 6
·3271-3286
·
IF 2.851
Sajid Muhammad,Bai Yuchen,Liu Dehua,Zhao Xuebing
Abstract Hydroxymethylfurfural (HMF) has been considered as one of the most promising biomass derived precursors for producing bio-based materials. Lewis acids are usually used to facilitate the isomerization of glucose to fructose in order to improve the HMF yield. In this study, glucose was converted to HMF with p -toluenesulfonic acid ( p TSA) and chlorides as Brønsted and Lewis acids catalysts in the DMSO medium at 120 °C under atmospheric pressure. Kinetic modeling of the process was investigated with consideration of glucose isomerization, dehydration of fructose, rehydration of HMF and formation of humin. NH 4 Cl was screened as the most efficient co-catalyst for glucose conversion with HMF yield of 47%. The developed model could be well used to simulate the process with satisfying goodness of fit. The activation energies for glucose isomerization, condensation, dehydration of fructose, and rehydration of HMF were determined to be 39.8, 18.1, 55.2, and 19.0 kJ/mol, respectively. However, because the fructose concentration was very low and the reaction rate of fructose dehydration was much higher than that of glucose isomerization, a pseudo-steady state assumption could be employed, by which the observed activation energy for a lumped reaction of glucose to HMF conversion ( E HMF ) was determined as 45.6 kJ/mol. The developed observed kinetic model could be well used to describe the kinetics of p TSA and chloride co-catalyzed conversion of HMF. Isomerization of glucose to fructose, condensation of glucose to form humin, dehydration of fructose to form HMF, and rehydration of HMF to LA were the major reactions in the system. To improve the HMF selectivity, efforts should be made to reduce the rate of glucose condensation to form humin Graphic Abstract
研究领域:
生物化学
·
可再生资源与环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）