中国化学快报

Select

Synthesis of mono-substituted derivatives of 6-aminoquinoline

Tian Lan, Xian Xia Yuan, Jiang Hong Yu, Chao Jia, Yu Shi Wang, Hui Juan Zhang, Zi Feng Ma, Wei Dong Ye

中国化学快报. 2011, 22(03): 253-255. https://doi.org/10.1016/j.cclet.2010.10.005

摘要 ( )

PDF全文 ( )

可视化

Several 6-aminoquinoline derivatives, which could be used in drug design, have been synthesized. The reaction conditions were comparatively studied, and the p-chloroaniline was used as optimum oxidant in Skraup-Doebner-Von Miller reaction. The nitro group was reduced effectively by SnCl₂ with no halo-removed occurred.

Select

Design, synthesis and biological evaluation of 1,4-dihydrothieno[3',2':5,6]thiopyrano[4,3-c]pyrazole-3-carboxylic amide derivatives as potential estrogen receptor antagonists

Rui Sun, Jing Song, Si Jie Liu, Hui Zhao, Chun Li Yan, Ai Jun Zhang, Diwa Koirala, Da Wei Li, Chun Hu

中国化学快报. 2011, 22(03): 256-259. https://doi.org/10.1016/j.cclet.2010.10.029

摘要 ( )

PDF全文 ( )

可视化

The estrogen receptor is a target for therapeutic agents for hormone replacement in menopausal women, osteoporosis, reproductive cancers such as breast cancer, uterine cancer and prostate cancer. 1,4-Dihydrothieno [3',2':5,6] thiopyrano [4,3-c] pyrazole-3-carboxylic amide derivatives were designed, synthesized and biological evaluated as potential estrogen receptor antagonists.

Select

Mesomorphic behavior of new azomethine liquid crystals having terminal iodo group

Sie-Tiong Ha, Teck-Leong Lee, Guan-Yeow Yeap, Masato M. Ito, Ayumu Saito, Masaaki Watanabe

中国化学快报. 2011, 22(03): 260-263. https://doi.org/10.1016/j.cclet.2010.09.017

摘要 ( )

PDF全文 ( )

可视化

A series of azomethine esters, 3-hydroxy-4-{[(4-iodophenyl)imino]methyl}phenyl alkanoates possessing even number of carbon atoms at the terminal alkanoyloxy chain (C_n-1H_2n-1COO-, n=4,6,8,10,12,14) was synthesized. n-Butanoyloxy was found non-mesogenic, whilst n-hexanoyloxy to n-tetradecanoyloxy exhibited enantiotropic smectic A phase with fan-shaped texture. It was found that the length of terminal alkanoyloxy chain influenced the mesomorphic properties.

Select

Synthesis of the key intermediate of ramelteon

Shan Bao Yu, Hao Min Liu, Yu Luo, Wei Lu

中国化学快报. 2011, 22(03): 264-267. https://doi.org/10.1016/j.cclet.2010.10.021

摘要 ( )

PDF全文 ( )

可视化

Asymmetric conjugated addition of allylcopper reagents derived from an allyl Grignard reagent and CuBr·Me₂S to chiral α,β-unsaturated N-acyl oxazolidinones has been achieved. The synthetic procedure was applied to the preparation of the key intermediate of the novel nonbenzodiazepine hypnotic drug, ramelteon.

Select

Synthesis of 1,2-allenic ketones through oxidation of homopropargyl alcohols with CrO₃(cat.)/TBHP under MWI

Xin Ying Zhang, Ying Ying Qu, Yang Yang Wang, Xue Sen Fan

中国化学快报. 2011, 22(03): 268-271. https://doi.org/10.1016/j.cclet.2010.09.032

摘要 ( )

PDF全文 ( )

可视化

A CrO₃ catalyzed oxidation of homopropargyl alcohols with tert-butyl hydroperoxide under microwave irradiation was found to be an efficient and rapid alternative for the preparation of 1,2-allenic ketones. The advantages of this procedure include short reaction time, less adverse impact on the environment and reasonably high efficiency.

Select

Acrosin structure-based design, synthesis and biological activities of 7-azaindol derivatives as new acrosin inhibitors

Jun Hang Jiang, Xue Fei Liu, Can Hui Zhen, You Jun Zhou, Ju Zhu, Jia Guo Lv, Chun Quan Sheng

中国化学快报. 2011, 22(03): 272-275. https://doi.org/10.1016/j.cclet.2010.09.033

摘要 ( )

PDF全文 ( )

可视化

A series of 7-azaindol derivatives were designed based on the homologous 3D model of human acrosin. These compounds were synthesized and evaluated for their human acrosin inhibitory activities in vitro. Compounds 7a, 7i, 7j, 7k and 7n showed highly inhibitory activity against human acrosin. The three-dimensional structure-activity relationship was investigated through a CoMFA model, which provided valuable information to further study of potential human acrosin inhibitors.

Select

Microwave-assisted convenient synthesis of N-arylpyrrolidines in water

Hong Bo Li, Wu Liang, Lang Liu, Kai Chen, Yi Wu

中国化学快报. 2011, 22(03): 276-279. https://doi.org/10.1016/j.cclet.2010.09.034

摘要 ( )

PDF全文 ( )

可视化

An efficient and clean synthesis of N-arylpyrrolidines from arylamines and 1,4-dimesyloxybutane was developed using microwave irradiation in an aqueous potassium carbonate medium without any catalyst. The procedure is rapid, simple and convenient.

Select

New thiopyran-4-spiro-2'-(1,3-dithiolane):Formation mechanism and crystal structure

Hong Qi Li, Zhong Bao Zhang, Lin Li

中国化学快报. 2011, 22(03): 280-283. https://doi.org/10.1016/j.cclet.2010.10.016

摘要 ( )

PDF全文 ( )

可视化

Ethylene trithiocarbonate reacted with dimethyl acetylenedicarboxylate to furnish tetramethyl thiopyran-4-spiro-2'-(l,3-dithiolane)-2,3,5,6-tetracarboxylate, a new thiopyran-4-spiro-2'-(l,3-dithiolane) heterocyclic compound, as the minor product together with the major product dimethyl 2-thioxo-l,3-dithiole-4,5-dicarboxylate. The new heterocycle was probably formed through a [2+2] cycloaddition between ethylene trithiocarbonate and dimethyl acetylenedicarboxylate followed by a 1,3-dipolar cycloaddition or [4+2] cycloaddition. Crystal structure of the new compound revealed that the thiopyran ring and 1,3-dithiolane moiety were perpendicular to each other.

Select

Synthesis of novel calixcrown derivatives with selective complexation towards cesium ions

Lu Zhang, Juan Du, Li Hua Yuan, Dong Zhang, Gui Ping Dan, Yuan You Yang, Wen Feng

中国化学快报. 2011, 22(03): 284-287. https://doi.org/10.1016/j.cclet.2010.10.004

摘要 ( )

PDF全文 ( )

可视化

A series of novel calix[4]arenecrown-6 derivatives with an alkenyl loop of various sizes 5-8 were synthesized via intramolecular ring closing olefin metathesis and characterized by ¹H NMR, ¹³C NMR and ESI-HRMS. Their complexation property towards cesium ion was studied by ¹H NMR technique. Two-phase extraction of alkali metal ions using UV-vis spectroscopy revealed remarkably different extractabilities. These results indicate that the complexation capacities towards cesium ions can be tuned and controlled through cooperative regulation of the strain of the loop and conformational change of calixcrown skelton.

Select

Cs_xH_3-xPW₁₂O₄₀ heteropoly salts catalyzed quinoline synthesis via Friedlander reaction

Ezzat Rafiee, Fereshte Khajooei Nejad, Mohammad Joshaghani

中国化学快报. 2011, 22(03): 288-291. https://doi.org/10.1016/j.cclet.2010.09.036

摘要 ( )

PDF全文 ( )

可视化

Various type of cesium partially substituted phosphotungstate, Cs_xH_3-xPW₁₂O₄₀ (x=1.0, 2.0 and 2.5), were synthesized and their catalytic activities were investigated in the synthesis of quinoline. It was shown that catalytic activities of these catalysts correlated to surface acidity and total number of acidic sites. Finally, a series of quinoline derivatives were synthesized with Cs_2.5H_0.5PW₁₂O₄₀ via the Friedlander reaction in high to excellent yields and the plausible mechanism was proposed. Simple experiment, catalyst reusability, short reaction time and preclusion of toxic solvent are the advantages of this method.

Select

Microwave assisted, ligand free, copper catalyzed reaction of aryl halides with phenyl urea

Sandip N. Gavade, Ravi S. Balaskar, Madhav S. Mane, Pramod N. Pabrekar, Murlidhar S. Shingare, Dhananjay V. Mane

中国化学快报. 2011, 22(03): 292-295. https://doi.org/10.1016/j.cclet.2010.09.037

摘要 ( )

PDF全文 ( )

可视化

The ligand free coupling reaction of phenyl urea with different functionalized aryl halides in the presence of air stable Cu₂O and t-BuOK as a base gives symmetrical and unsymmetrical diarylureas in relatively high yields. This method is milder than the palladium catalyzed arylation and avoids the use of toxic phosphine ligand.

Select

VO(acac)₂ catalyzed condensation of o-phenylenediamine with aromatic carboxylic acids/aldehydes under microwave radiation affording benzimidazoles

Madhudeepa Dey, Krishnajyoti Deb, Siddhartha Sankar Dhar

中国化学快报. 2011, 22(03): 296-299. https://doi.org/10.1016/j.cclet.2010.10.031

摘要 ( )

PDF全文 ( )

可视化

Vanadyl acetylacetonate, VO(acac)₂, has been found to be very effective catalyst for synthesis of a variety of benzimidazoles under solvent-free condition. The methodology involves the exposure of a mixture of o-phenylenediamine and a selected aromatic carboxylic acid/aldehyde to microwave radiation without the use of any solvent or supporting agents. The benzimidazoles were obtained in quick time with high yields.

Select

An efficient method for synthesis of phenacyl derivatives under homogeneous phase transfer catalyst condition in aqueous media

Soheil Sayyahi, Jafar Saghanezhad

中国化学快报. 2011, 22(03): 300-302. https://doi.org/10.1016/j.cclet.2010.10.009

摘要 ( )

PDF全文 ( )

可视化

In this letter, a mild and efficient procedure for synthesis of phenacyl derivatives under homogenous catalysis in the presence of tetrabutylammonium bromide in aqueous media is described. The nucleophilic substitution reactions were performed under ecofriendly conditions and gave the corresponding products in high yields and short reaction times.

Select

Synthesis and catalytic properties of hierarchical TS-1 in the presence of cationic organosilane surfactant

Shu Shuang Li, An Feng Zhang, Min Liu, Xin Wen Guo

中国化学快报. 2011, 22(03): 303-305. https://doi.org/10.1016/j.cclet.2010.06.036

摘要 ( )

PDF全文 ( )

可视化

Hierarchical TS-1 has been synthesized in the presence of cationic organosilane surfactant. The material is characterized with XRD, TEM, N₂ adsorption isotherm. The results show that the hierarchical TS-1 aggregates consist of small primary units with sizes of 20-30 nm. The BET surface area increases from 420 to 513 m²/g compared to conventional TS-1 zeolite. The sample is shown to be more active in epoxidation of cyclohexene than conventional TS-1.

Select

Synthesis of cyclic β-silylenones via oxidative rearrangement of tertiary α-hydroxy allylsilanes with PCC

Xia Wu, Jian Lei, Zhen Lei Song

中国化学快报. 2011, 22(03): 306-309. https://doi.org/10.1016/j.cclet.2010.10.018

摘要 ( )

PDF全文 ( )

可视化

An oxidative rearrangement of cyclic tertiary α-hydroxy allylsilanes has been carried out in refluxing ClCH₂CH₂Cl with pyridinium chlorochromate (PCC). The reaction provides a convenient method to synthesize cyclic β-silylenones in modest to excellent yields.

Select

Iron-catalyzed bromination of aryl azides by N-bromosuccinimide:Efficient method for the synthesis of brominated aryl azides

Hui Jin, Zhen Dong Huang, Chun Xiang Kuang, Xiao Kun Wang

中国化学快报. 2011, 22(03): 310-313. https://doi.org/10.1016/j.cclet.2010.10.024

摘要 ( )

PDF全文 ( )

可视化

An efficient and mild protocol for bromination of aryl azides with N-bromosuccinimide (NBS) under FeCl₃ catalysis in 1,2-dichloroethane was developed. It is proved to be an efficient method for obtaining brominated aryl azides.

Select

1-Methylimidazole-catalyzed reaction between tosylmethyl isocyanide and dialkyl acetylenedicarboxylates:An efficient synthesis of functionalized pyrroles

Mehdi Adib, Bagher Mohammadi, Ehsan Sheikhi, Hamid Reza Bijanzadeh

中国化学快报. 2011, 22(03): 314-317. https://doi.org/10.1016/j.cclet.2010.10.032

摘要 ( )

PDF全文 ( )

可视化

An efficient 1-methylimidazole-catalyzed synthesis of dialkyl 2-[(4-methylphenyl)sulfonyl]-1H-pyrrole-3,4-dicarboxylates is described. The reactive 1:1 zwitterionic intermediate formed by the addition of 1-methylimidazole to dialkyl acetylenedicarboxylates is trapped by tosylmethyl isocyanide (TOSMIC) to afford the title compounds in excellent yields.

Select

Melamine trisulfonic acid:A new, efficient and recyclable catalyst for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones in the absence of solvent

Farhad Shirini, Mohammad Ali Zolfigol, Jalal Albadi

中国化学快报. 2011, 22(03): 318-321. https://doi.org/10.1016/j.cclet.2010.10.033

摘要 ( )

PDF全文 ( )

可视化

Melamine trisulfonic acid (MTSA) can be used as an efficient and recyclable catalyst for the promotion of the synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones (DHPMs) in the absence of solvent. All reactions were performed at 80℃ in good to high yields.

Select

Hafnium (IV) bis(perfluorooctanesulfonyl)imide complex catalyzed direct amidomethylation for the synthesis of l-(arylamido)-methyl-2-naphthols in fluorous medium

Mei Hong, Chun Cai, Wen Bin Yi

中国化学快报. 2011, 22(03): 322-325. https://doi.org/10.1016/j.cclet.2010.10.046

摘要 ( )

PDF全文 ( )

可视化

Hafnium (IV) bis(perfluorooctanesulfonyl) imide complex is found to be an efficient catalyst for the multicomponent condensation of β-naphthol, aromatic aldehydes and urea or amides in perfluorodecalin to afford the corresponding substituted amidomethyl naphthols in good yields. The remarkable features of this new procedure are high yields, shorter reaction times, reusability of catalyst and simple work-up procedures.

Select

Two new phenethanol glycosides from Ligustrum robustum

Li Li, Yong Peng, Yong Liu, Li Jia Xu, Na Guo, Ren Bing Shi, Pei Gen Xiao

中国化学快报. 2011, 22(03): 326-329. https://doi.org/10.1016/j.cclet.2010.10.030

摘要 ( )

PDF全文 ( )

可视化

Two new phenethanol glycosides, named ligurobustoside P (1), Iigurobustoside Q (2) have been isolated from the leaves of Ligustrum robustum, together with the known compound angoroside A (3) which was firstly isolated from this species. The structures of the two new phenethanol glycosides (1-2) were elucidated by a combination of high-resolution electron ionization mass spectrometry (HR-ESI-MS), ¹H NMR, ¹³C NMR, HMQC, and HMBC spectra for the first time.

Select

Determination of strychnine and brucine in traditional Chinese medicine preparations by capillary zone electrophoresis with micelle to solvent stacking

Xiao Fang Tin, Zhi Li, Shuai Hua Zhang, Chun Xia Wu, Chun Wang, Zhi Wang

中国化学快报. 2011, 22(03): 330-333. https://doi.org/10.1016/j.cclet.2010.10.044

摘要 ( )

PDF全文 ( )

可视化

A novel micelle to solvent stacking on-line sample preconcentration technique in capillary zone electrophoresis (MSS-CZE) has been developed to determine the strychnine and brucine in traditional Chinese medicine preparations. The optimal running buffer was 30 mmol/L H₃PO₄ containing 20% acetonitrile at pH 4.0. The sample matrix was 8 mmol/L H₃PO₄ containing 5 mmol/L sodium dodecyl sulfate (SDS) at pH 3.0. The established MSS-CZE method afforded more than 50-fold improvements in concentration sensitivity compared with typical CZE-UVanalysis. The calibration curve was linear in the range from 0.2 to 15.0 μg/mL for both strychnine and brucine, with correlation coefficients of 0.9984 and 0.9976, respectively. The limits of detection (S/N=3:1) for strychnine and brucine were 0.02 and 0.05 μg/mL, respectively. The MSS-CZE method has been successfully applied to the analysis of strychnine and brucine in Chinese medicinal preparations.

Select

Simultaneous determination of 14 β-lactam antibiotics in cosmetic products by liquid chromatography tandem mass spectrometry method

Cai Sheng Wu, Jin Lan Zhang, Yan Ling Qiao, Yi Lin Wang, Zhi Rong Chen

中国化学快报. 2011, 22(03): 334-337. https://doi.org/10.1016/j.cclet.2010.09.035

摘要 ( )

PDF全文 ( )

可视化

In this study, a simple and rapid high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was established and validated to determine the 14 β-lactam antibiotics in cosmetic products, including 1 (ceftazidime), 2 (cefaclor), 3 (cefdinir), 4 (ampicillin), 5 (cefalexin), 6 (ceftezole), 7 (cefotaxim), 8 (cefradine), 9 (cefuroxime), 10 (cephazoline), 11 (cefathiamidine), 12 (cefoperazone), 13 (cafalotin), 14 (piperacillin).

Select

Photoregulation of protein plasmid expression in vitro and in vivo using BHQ caging group

Zhi Ping Zhang, Yi Ming Li, Xiao Yun Chen, Qing Xiang Guo

中国化学快报. 2011, 22(03): 338-341. https://doi.org/10.1016/j.cclet.2010.10.007

摘要 ( )

PDF全文 ( )

可视化

Green fluorescent protein (GFP) plasmid was caged by 8-bromo-7-hydroxyquinolinyl chromophore (BHQ) for controlling its expression with exact spatiotemporal resolution. In vitro and in vivo experiments clearly verified that, comparing with Bhc caging, the expression level of caged GFP plasmid was dramatically decreased and then efficiently restored after subsequent photolysis.

Select

Determination of uric acid in human urine by ion chromatography with conductivity detector

Fu Yong Zhao, Zong Hua Wang, Hui Wang, Rui Zhao, Ming Yu Ding

中国化学快报. 2011, 22(03): 342-345. https://doi.org/10.1016/j.cclet.2010.10.008

摘要 ( )

PDF全文 ( )

可视化

A simple, fast, precise and eco-friendly analytical method for the determination of uric acid (UA) in human urine by ion chromatography (IC) was established. The sample pretreatment was not required, only needed centrifugation and filtration. The separation was carried out on a cation exchange column with 2.0 mmol/L nitric acid as mobile phase at the flow-rate 1.0 mL/min. A non-suppressed conductivity detector was used. The IC analysis time for one run was within 10 min under the optimized IC condition. The detection limits were 0.5 μg/L(S/N=3) for uric acid. The recovery was 100.1% while the relative standard deviation (RSD) was 1.8% from 10 measurements.

Select

Erbium(Ⅲ) PVC membrane sensor based on N-(benzyloxycarbonyloxy)succinimide as a new neutral ionophore

Hassan Ali Zamani

中国化学快报. 2011, 22(03): 346-349. https://doi.org/10.1016/j.cclet.2010.07.037

摘要 ( )

PDF全文 ( )

可视化

In this study, a new Er³⁺ sensor based on N-(benzyloxycarbonyloxy)succinimide (BCS) as a neutral carrier has been constructed. The sensor exhibits potential linear response with a Nernstian slope of 20.5 ±0.4 mV/decade in the concentration range of 1.0×10^-6 to 1.0×10^-2 mol/L of Er³⁺. It has a very short response time (<10 s), detection limit of 6.3×10^-7 mol/L and a good selectivity relative to a wide variety of other metal ions including common alkali, alkaline earth, heavy, and transition metal ions. It can be used in the pH range of 2.5-10.6 without any considerable divergence in potentials. The proposed sensor was successfully applied for the recovery of Er³⁺ ions spiked in tap and river water samples.

Select

Determination of metoprolol in rabbit blood using capillary electrophoresis with laser-induced fluorescence detection

Yu Yun Chen, Wei Ping Yang, Zhu Jun Zhang

中国化学快报. 2011, 22(03): 350-353. https://doi.org/10.1016/j.cclet.2010.10.025

摘要 ( )

PDF全文 ( )

可视化

This work described a sensitive method for determination of metoprolol in rabbit plasma. The method involved purification by ultrafiltration, derivatization with fluorescein isothiocyanate, determination by capillary electrophoresis (CE) coupled with laser-induced fluorescence (LIF) detector. Other components in plasma including a variety of amino acids and proteins did not interfere with the determination of metoprolol in experimental condition. The assay had a wide range (2.0-500 ng/mL) of linearity and a detection limit of 0.8 ng/mL. The intra-and inter-day precisions were satisfactory with relative standard deviation (RSD) less than 10.0% and accuracy within 10.0%. This method was successfully applied to pharmacokinetic study of metoprolol in rabbit blood.

Select

A novel method to prepare metal oxide electrode:Spin-coating with thermal decomposition

Hao Xu, Wei Yan, Cheng Li Tang

中国化学快报. 2011, 22(03): 354-357. https://doi.org/10.1016/j.cclet.2010.10.027

摘要 ( )

PDF全文 ( )

可视化

In this work, we propose a new spin-coating method coupling with high thermal decomposition, to prepare the tin-antimony (Sn-Sb) oxide electrode. The character of the spin-coating electrode was compared with the dip-coating electrode through X-ray diffraction (XRD), scanning electron microscopy (SEM), accelerated life test, cyclic voltammetry, and electrolytic degradability. The results showed that the spin-coating electrode had a better defined crystal form, a smoother and more compact surface than that of the dip-coating electrode. Service time of the spin-coating electrode was determined to be longer than 15 h, and it was less than 2 min for the dip-coating electrode. Electrochemical characterization analysis showed that the electrolytic degradability of the spin-coating electrode is better than that of the dip-coating electrode.

Select

Temperature effect on the kinetics of persulfate oxidation of p-chloroaniline

Yong Qing Zhang, Xiao Zhe Du, Wei Lin Huang

中国化学快报. 2011, 22(03): 358-361. https://doi.org/10.1016/j.cclet.2010.10.015

摘要 ( )

PDF全文 ( )

可视化

The kinetics of heat-facilitated persulfate oxidation of p-chloroaniline (PCA) in aqueous solutions was measured at five different temperature conditions and at four different oxidant concentrations. The PCA degradation was found to follow a pseudo-first-order decay model when the persulfate was excessive. The pseudo-first-order rate constants of PCA degradation by persulfate (50 mmol/L) at pH 7.0 are 0.12×10^-4, 0.28×10^-4,0.43×10^-4, 0.83×10^-4, 1.32×10^-4 s^-1 at 10, 20, 30, 40 and 50℃, respectively. Under the above reaction conditions, the reaction has activation energy of 49.97 kJ/mol. The observed rate was found to be function of temperature and oxidant concentration. Raising temperature and increasing persulfate concentration can significantly accelerate the PCA degradation.

Select

Effects of ethanol on the in situ synthesized Cu/SiC₂ catalyst:Texture, structure, and the catalytic performance in hydrogenation dimethyl oxalate to ethylene glycol

Shu Rong Wang, Ling Jun Zhu, Ying Ying Zhu, Xiao Lan Ge, Xin Bao Li

中国化学快报. 2011, 22(03): 362-365. https://doi.org/10.1016/j.cclet.2010.10.006

摘要 ( )

PDF全文 ( )

可视化

The Cu/SiO₂ catalysts were in situ synthesized by the hydrolysis of tetraethyl orthosilicate (TEOS) in one phase solution using ethanol as co-solvent or TEOS/H₂O two phases solution, followed by the precipitation of copper on SiO₂ by ammonia evaporation. In the hydrogenation of dimethyl oxalate, the catalyst prepared by one phase hydrolysis exhibited higher activity and ethylene glycol (EG) selectivity at lower temperature than that of two phases due to its larger BET surface area and multimodal pore distribution. At 488-503 K, the catalyst prepared in one phase solution with water/ethanol (W/E) volume ratio of 3:1 exhibited 90-95% EG selectivity, while catalyst prepared by two phase hydrolysis reached 90% EG selectivity only at 498-503 K.

Select

Investigation on the active phase of CoMo catalyst for selective HDS by low temperature in situ FT-IR

Qiherima, Hui Yuan, Hui Feng Li, Yun Hong Zhang, Guang Tong Xu

中国化学快报. 2011, 22(03): 366-369. https://doi.org/10.1016/j.cclet.2010.10.045

摘要 ( )

PDF全文 ( )

可视化

The CoMo/Al₂O₃ catalysts with different metal loading were studied by low temperature in situ FT-IR using CO as probe molecule which appears to be a powerful method by giving rise to signals specific for unpromoted and promoted Mo sites. The result revealed that the increase of C0M0S phase on the catalyst surface improves the HDS activity and selectivity. The ratio of active site number of CoMoS and MoS₂ correlates linearly with HDS selectivity, which provides an effective tool for developing industrial selective HDS catalysts.

Select

Synthesis of amphiphilic tri-block copolymer poly(vinylpyrrolidone)-b-poly(methyl methacrylate)-b-poly(vinylpyrrolidone) for the modification of polyethersulfone membrane

Sheng Qiang Nie, Fen Ran, Chao He, Peng Fei Zhao, Xiao Hong Wei, Jie Li, Chang Sheng Zhao

中国化学快报. 2011, 22(03): 370-373. https://doi.org/10.1016/j.cclet.2010.10.017

摘要 ( )

PDF全文 ( )

可视化

Well-defined amphiphilic tri-block copolymer PVP-b-PMMA-b-PVP was prepared for the first time via successive reversible addition fragmentation chain transfer (RAFT) polymerization using carboxyl-terminated trithiocarbonate as the RAFT agent. The structure of the copolymer was characterized using FTTR, GPC and ¹H NMR. The block copolymer could be directly blended with polyethersulfone (PES) as a macromolecule additive using N-methyl-2-pyrrolidone (NMP) as the solvent to prepare membranes. The water contact angles for the modified membranes decreased obviously, and therefore, the protein adsorption amount on the membrane surface decreased.

Select

Synthesis and application of novel degradable crosslinkers

Xin Ce Sui, Zhi Feng Fu, Yan Shi

中国化学快报. 2011, 22(03): 374-377. https://doi.org/10.1016/j.cclet.2010.10.028

摘要 ( )

PDF全文 ( )

可视化

A novel divinyl ether was synthesized by a convenient method with high yield. Then the divinyl ether was combined with 2-hydroxyethyl methacrylate and acrylic acid, respectively, generating difunctional polymeric crosslinkers with (hemi) acetal structure that was labile in acid. The chemical structures of the divinyl ether and crosslinkers were confirmed by ¹H NMR and elemental analysis. The crosslinkers were employed in free-radical polymerization to prepare polymer gel and gel particles. Due to the (hemi)acetal structure in the crosslinking segment, the polymer gel and particles exhibited degradable ability in strong acid.

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2011年, 第22卷, 第03期　刊出日期：2011-03-20

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2011年, 第22卷, 第03期 刊出日期：2011-03-20

2011年, 第22卷, 第03期　刊出日期：2011-03-20