ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Liuqing Xiao,Yuxing Huang,Yu Luo,Bo Yang,Yizhen Liu,Xuechang Zhou,Junmin Zhang
Cotton fiber is an abundant natural material, which has a long history of application in human daily life. However, a report on using such material in catalysis for organic synthesis is rare. We envisaged that the hydroxyl groups on the surface of cotton fiber could be utilized for functionalization and further immobilization of organic catalysts. In this report, we demonstrate the facile functionalization of cotton fiber by growing polymer brushes on its surface and further anchoring of Rose Bengal (RB) organic photocatalyst. This novel composite cotton photocatalyst demonstrated high efficiency in catalyzing cross-dehydrogenative coupling reactions and N-demethylation reactions with irradiation of visible light. The catalytic reaction can be facilely scaled up by a homemade circulating flow reactor.
研究领域:
化学工程
·
材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Jie Zhang,Liguo Xu,Wenhao Xiao,Yang Chen,Zhixian Dong,Jinbao Xu,Caihong Lei
With the increasing requirements concerning healthy and environmental issues of modern-day society, green chemistry and atomic economy have become the consensus of researchers and manufacturers, enabling us to explore much facile way to prepare biodegradable and biocompatible polyesters which have been widely utilized in many fields. Therefore, squaric acid (SA) a commercially available organic acid, was evaluated as the organocatlyst for the ring-opening polymerization (ROP) of ε -caprolactone (CL) to synthesize polyesters with benzyl alcohol (BzOH) as the initiator under bulk at a temperature of 80 °C. The polymerizations were demonstrated in a controlled/living character, allowing for the obtained PCLs with expected molecular weight and narrow dispersity. Moreover, PCL-based block copolymers and end-functionalized PCLs containing vinyl, alkynyl and pyrenyl chain-end were also prepared. Excitingly, SA can be facilely recovered and reused up to ten consecutive cycles without distinguishable decline in catalytic activity and MTT assay was performed to explore the cytotoxicity of the polymers.
研究领域:
材料化学
·
绿色化学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2019
·
IF 4.745
Yong-Long Zhao,Xing-Hai Fei,Yong-Qin Tang,Peng-Fei Xu,Fen-Fen Yang,Bin He,Xiao-Zhong Fu,Yuan-Yong Yang,Meng Zhou,Yuan-Hu Mao,Yong-Xi Dong,Chun Li
An organocatalytic asymmetric α-sulfenylation of 2-substituted indolin-3-ones with N-(alkylthio or arylthio)succinimides has been developed for the first time using Cinchona-derived squaramide as the catalyst. Various chiral 2,2-disubstituted indole-3-ones with S- and N-containing heteroquaternary carbon stereocenters were obtained with up to 98% yield and 99% ee.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Weiran Zhu,Nan Hao,Chen Chen,Yu Qiu,Yanli Zuo,Jie Wei,Jing Qian,Kun Wang
The performance-enhancing strategy of a single pathway for perovskite has been widely studied. In this work, the dual-pathway strategy of A-site Ce substitution and nitric acid selective dissolution was proposed. The catalytic oxidation performance of LaMnO3 exhibits the characteristic of hierarchical regulation, that is, a steplike improvement, which avoids the limitation of performance improvement of the single pathway. The B-site Mn with catalytic activity was in situ reconstituted on the surface to build a Mn-rich surface. The obtained sdLa0.7Ce0.3MnO3 has the advantages of good oxygen mobility, high Mn4+/Mn3+ molar ratio, and large specific surface area, and this material showed excellent catalytic oxidation performance for organics, which can realize colorimetric chemical oxygen demand detection at room temperature. Here, Ce substitution improved the oxidation capacity by improving the oxygen mobility and the ratio of Mn4+/Mn3+, and further nitric acid treatment not only accelerated the in situ reconstruction of B-site Mn but also increased the specific surface area.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 4
·1269-1280
·
IF 2.573
Shuo Chen,Yu Feng,Zhi-Yuan Zhang,Xiang-Yuan Li,Jun-Ying Zhang,Jing-Bo Zhao
Diels–Alder (DA) addition is an efficient method to repair damages at mild conditions. It is often used in self-healing polyurethanes and epoxy resins and seldom used in cross-linked polyamides (cPAs). Michael addition becomes a useful method to synthesize cPAs. However, no efficient way has been established to conduct double-addition of primary amines. In this work, organic catalyzed Michael addition and polycondensation were established to prepare polyamide oligomers with furan pendent groups (pFU-PAs), and a DA addition was adopted to prepare self-healing cross-linked polyamides (SH-cPAs). A bulk double Michael addition of furfurylamine and methyl acrylate was performed at 30–70°C in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD), or 4-(N,N-dimethylamino) pyridine (DMAP), and a high yield of furfurylamine-N,N-bis(methyl propionate) (FA-BMP) was prepared. The catalytic activity order is MTBD>TBD >>DMAP in Michael addition. Melt polycondensation of FA-BMP with bis(2-aminopropyl) polypropyleneglycol and hexamethylene diamine was catalyzed by MTBD and N,N′-diphenylthiourea. The DA addition of 1,5-bismaleimido-2-methylpentane and pFU-PAs was monitored by FT-IR, 1 H NMR, DSC, polarizing optical microscopy, and gel content. In these catalyzed processes, the structures of FA-BMP, pFU-PAs, and SH-cPAs were controlled easily, and the SH-cPAs showed good mechanical property and excellent self-healing performance of 88%–98%.
研究领域:
材料化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 5
·1300-1307
·
IF 2.936
Zhu Guozhi,Shi Song,Feng Xiao,Zhao Li,Cao Jieqi,Wang Yinwei,Sun Zhiqiang,Gao Jin,Xu Jie
Selective oxidation of cyclohexylbenzene is a potentially promising process in industrial application. Herein, we reported an organocatalytic system to achieve the selective oxidation of C α –H bonds in cyclohexylbenzene and transformation of active intermediate C α peroxide by an oxidation then decomposition method. The pair of N -hydroxyphthalimide and 2-Chlorothraquinone (NHPI/AQ-Cl) as metal-free organic catalysts showed the highest efficient in selective oxidation of cyclohexylbenzene to C α peroxide and C α alcohol. And the base modified covalent triazine frameworks could facilitate the C α peroxide decomposition to the C α alcohol. Up to 8.8% conversion of substrate and 80% selectivity of 1-phenylcyoclohexanol were achieved under the optimized conditions. This work provided a new organocatalytic strategy to achieve the aerobic selective oxidation of C α –H bonds in cyclohexylbenzene. Graphical Abstract
研究领域:
化学
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Wen-Wang Yu,Xiang-Guang Meng,Wen Li,Li-Yu Chen,Zi-Yu Gan,Yu-Lian Zhang,Jie Zhou
Chemical conversion of CO 2 to cyclic carbonates is one of the most attractive strategies for CO 2 capture and storage utilization. Herein, a binary organocatalyst of 3-aminobenzylalcohol/ n -Bu 4 NI was used to gently catalyze the insertion of CO 2 into the terminal/internal epoxides to generate cyclic carbonates under metal-free and solvent-free conditions. Twelve representative terminal epoxides reacted with CO 2 to achieve excellent cyclic carbonate yields of up to 98.3 % at 30 °C and 1 atm CO 2 and six low activity internal di-substituted epoxides were converted to corresponding cyclic carbonates with yields of up to 96.2 %. Experiments on actual flue gas and water resistance revealed the potential industrial value of this binary organocatalyst. The yield of cyclic carbonate reached 99 % by using actual flue gas under very mild conditions of 60 °C and 1 atm. The results of 4-fold epoxide amplification experiment showed that the residual CO 2 in the flue gas was only 793 ppm after reaction at 1 atm and 60 °C, indicating the good CO 2 capture and conversion ability. Reaction kinetics and catalytic mechanism of the cycloaddition were investigated in detail. The synergistic effect among functional groups of catalysts on substrates is the essential factor for the high activity of the catalyst.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Yujian Liu,Yongyao Lei,Yougen Chen
The current contribution presents the synthesis of poly[oligo(ethylene glycol) sorbate]s (PREGmSs) by the t-Bu-P4-catalyzed group transfer polymerization (GTP) method, their postpolymerization modification at the backbone double bond, and thermoresponsive properties in aqueous solution. Four oligo(ethylene glycol) sorbate monomers (REGmSs), including 2-(2-methoxyethoxy)ethyl sorbate (MeEG2S), 2-(2-(2-methoxyethoxy)ethoxy)ethyl sorbate (MeEG3S), 2-(2-(2-ethoxyethoxy)ethoxy)ethyl sorbate (EtEG3S), and 2-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)ethyl sorbate (MeEG4S), are newly designed to study the thermoresponsive properties of their related polymers. The t-Bu-P4-catalyzed GTP of REGmS only proceeds in a 1,4-regioselective addition manner to quantitatively produce the backbone trans-rich (ca. 80%) PREGmS. The complete hydrogenation and epoxidation of the backbone double bonds result in hydrogenated and epoxidized polymers (PREGmS-H2 and PREGmS-epoxy, respectively), which have different main-chain structures and rigidity from their parent PREGmS. Given the 1,4-substituted structure of a sorbate monomer, the chemical structure determination of PREGmS-H2 by 13C NMR spectra demonstrates that the above polymers have an erythro-rich (ca. 60%) structure in diastereochemistry and a diisotactic/disyndiotactic ratio around 1:1 in stereoregularity. The thermoresponsive properties of PREGmS, PREGmS-H2, and PREGmS-epoxy in aqueous solutions are studied in detail from various aspects in terms of polymer mass concentration, molecular weight, length and end group of the oligo(ethylene glycol) side chain, and main-chain structure by turbidity, 1H NMR spectroscopy, and dynamic light scattering (DLS) methods, which are discussed below.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2016
·
IF 3.586
Qilei Song,Yening Xia,Shuangyan Hu,Junpeng Zhao,Guangzhao Zhang
The copolymerization of ε -caprolactone (CL) with its structural isomer , δ -hexalactone (HL), or trimethylene carbonate (TMC) catalysed by diphenyl phosphate was investigated. Copolymers with molar fraction of CL units ranging from 54% to 95% were obtained. Molecular characterization exhibited random distribution of the two monomeric units (CL/HL or CL/TMC), owing to the extensive occurrence of transesterification scrambling reactions at high temperature. Compared with poly( ε -caprolactone) (PCL), the copolymers showed reduced crystallinity and enhanced enzymatic degradability as revealed by the analysis with differential scanning calorimetry and quartz crystal microbalance with dissipation, respectively. Interestingly, the incorporation of HL units showed a more profound impact than TMC. It is therefore considered that organocatalytic copolymerization with HL, a bio-renewable lactone, can serve as an effective method to regulate the properties of PCL.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2018
·Vol. 361
·期 2
·317-325
·
IF 5.123
Pei-Xuan Wu,Hai-Yang Cheng,Ru-Hui Shi,Shan Jiang,Qi-Fan Wu,Chao Zhang,Masahiko Arai,Feng-Yu Zhao
The synthesis of polyurea via the addition of carbon dioxide (CO 2 ) to a diamine of 4,7,10-trioxa-1,13-tridecanediamine (TOTDDA) was investigated by using organic and inorganic base catalysts. It was found that 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) was the most active among the catalysts examined. The influence of CO 2 pressure, temperature, and reaction time was examined for the DBU-catalyzed polyurea synthesis. The reaction mixture was analyzed by in situ high-pressure attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR) under reaction conditions, and possible reaction mechanisms, in which DBU can activate both CO 2 and TOTDDA, were proposed. Physicochemical properties of polyurea materials synthesized were examined by several techniques. In addition, the catalytic performance of DBU was further examined for the addition of CO 2 to other different diamine compounds.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2013
·Vol. 291
·期 9
·2155-2162
·
IF 2.161
Zhou Xi,Hong Liangzhi
( R )-(−)-1,1′-Binaphthyl-2,2′-diyl hydrogen phosphate (BPA) has been demonstrated as an efficient organocatalyst for controlled ring-opening homopolymerization of ε-caprolactone (ε-CL) and copolymerization of ε-CL with glycolide and lactide. High molar mass PCL with narrow molar mass distribution has also been synthesized from the bulk ring-opening polymerization (ROP) of ε-CL with BPA as catalysts; the highest molar mass of PCL is 4.35 × 10 4 g/mol with polydispersity index of 1.20. The successful synthesis of high molar mass PCL is attributed to the bifunctional activation mechanism for the ROP of ε-CL catalyzed by BPA. More interestingly, ppm level of BPA is sufficient to catalyze controlled ROP of ε-CL.
研究领域:
高分子化学
·
生物材料
·
有机催化
·
可控聚合
·
可降解材料
✓ 已验证
DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Ying-Han Chen,De-Hai Li,Yan-Kai Liu
Two different organocatalytic cascade reaction pathways have been developed toward the diversified synthesis of chromane-containing polyheterocyclic compounds from the readily available starting materials. The application of Hantzsch ester is proposed to be the key to achieve the switch between these two different cascade reaction pathways, and then the electron-deficient 1-aza-1,3-butadienes could be used as the four-atom and two-carbon unit, respectively, to react with 2-hydroxy cinnamaldehydes in a highly regio- and stereocontrolled manner. On the basis of larger-scale synthesis, further transformations of the obtained products have also been realized, leading to cycloadducts with high structural and stereogenic complexity bearing five stereogenic centers, and one is a tetrasubstituted stereocenter.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
PubMed
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