2009年, 第20卷, 第02期　刊出日期：2009-02-20

  

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  Highly efficient removal of allyloxycarbonyl (Alloc) function provides a practical orthogonal protective strategy for carbohydrates

  Guang Hui Zong, Shi Qiang Yan, Xiao Mei Liang, Jian Jun Zhang, Dao Quan Wang, Fan Zuo Kong

  中国化学快报. 2009, 20(02): 127-130. https://doi.org/10.1016/j.cclet.2008.11.002

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Highly efficient removal of allyloxycarbonyl (Alloc) group was achieved in the presence of CH₃COONH₄, Pd[P(C₆H₅)₃]₄, and NaBH₄ in MeOH-THF, within 5 min in almost quantitative yields (>90%, isolated yield) without affecting acetyl, benzoyl, isopropylidene, benzylidene, allyl, benzyl, benzyl carbonate, or azido groups.
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  Synthesis of propylene carbonate from urea and 1,2-propanediol

  Zhi Wen Gao, Shou Feng Wang, Chun Gu Xia

  中国化学快报. 2009, 20(02): 131-135. https://doi.org/10.1016/j.cclet.2008.10.038

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  The production of propylene carbonate (PC) from urea and 1,2-propanediol (PG) was investigated in a batch process. The catalytic performances of zinc chloride and magnesium chloride were investigated for this reaction system. The influences of various operation conditions on the PC yield were explored. In this work, MgCl₂ and ZnCl₂ showed the excellent catalytic activity toward PC synthesis, and the yields of propylene carbonate reached 96.5% and 92.4%, respectively. The optimum reaction conditions were as follows: ethanol/urea molar ratio of 4, catalyst concentration of 1.5%, reaction temperature of 160℃, reaction time of 3 h, respectively. The route from urea and 1,2-propanediol shows advantages, such as mild reaction condition and safe operation. The catalytic system is environmentally benign.
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  Study on synthesis and distribution in vivo of 5-Fu-cholic acid conjugate

  Jie Li, Li Hai, Wei Jia Liu, Xiao Chun Wu, Yong Wu

  中国化学快报. 2009, 20(02): 136-138. https://doi.org/10.1016/j.cclet.2008.11.004

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A series of hepatic targeting drugs, 5-Fu-cholic acid conjugate T₁-T₅, were synthesized. 5-Fu and cholic acid was selected as starting material, after N-hydroxymethylation, condensation, hydrogenolysis to obtain carboxylated 5-Fu 5a-e. Carboxylated 5-Fu 5a-e were condensated with intermediate 3-hydroxyethyl cholic acid benzyl ester 6 to get 7a-e, 7a-e were deprotected to get T₁-T₅.
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  β-Cyclodextrin promoted oxidation of aldehydes to carboxylic acids in water

  Dong Po Shi, Hong Bing Ji

  中国化学快报. 2009, 20(02): 139-142. https://doi.org/10.1016/j.cclet.2008.10.037

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A facile, efficient and substrate-selective oxidation of aldehydes to carboxylic acids with NaClO catalyzed by β-cyclodextrin in water has been developed. A series of aldehydes which could form inclusion complex with β-cyclodextrin (β-CD) were oxidized selectively with excellent yields.
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  A new member of the calix[4]crown family: Facile synthesis and characterization of a calix[4]crown-9 cone conformer

  Hao Hui Zhou, Xian Mei Shang, Zhi Luo, Yu Xiang Xia, Jun Luo, Guang Ya Xiang

  中国化学快报. 2009, 20(02): 143-146. https://doi.org/10.1016/j.cclet.2008.10.052

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  25,27-Dipropoxy-p-tert-butylcalix[4]crown-9 cone conformer 5 was readily synthesized via an intramolecular cyclization strategy in good yields. The structures of all the new compounds involved were confirmed by NMR, ESI-MS and elemental analyses. All of them were proved to be in the cone conformation.
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  Synthesis of gibbilimbols B and D by a modified Ramberg-Bäcklund reaction

  Tao Wang, Ling Zhou, Xiao Ping Cao

  中国化学快报. 2009, 20(02): 147-149. https://doi.org/10.1016/j.cclet.2008.10.034

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Gibbilimbols B and D were synthesized from the facile rearrangement of sulfone in the presence of dibromodifluoromethane and alumina-supported KOH in dichloromethane, followed by refluxing the rearrangement products in conc. HCl and methanol and then treating with thiophenol in the presence of AIBN.
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  Biomimetic transformation of gentiopicroside to erythrocentaurin

  Cui Ling Wang, Jian Li Liu, Zhu Lan Liu, Xin Sheng Li, Xiao Yong Cao

  中国化学快报. 2009, 20(02): 150-152. https://doi.org/10.1016/j.cclet.2008.10.051

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Biomimetic transformation of gentiopicroside was carried out by β-glucosidase at pH 7.0 for 3 days at 37℃. Two products,erythrocentaurin and 5,6-dihydro-5-formyl-6-methyl-1H,3H-pyrano[3,4-c]pyran-1-one were isolated and identified by ¹H NMR,¹³C NMR, UV, IR, MS and elemental analyse. The possible mechanisms were discussed.
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  A two step facile synthesis of new steroidal linear and angular pyranones having anti-mycobacterial activity

  Shams-uz-zaman, Tabassum Siddiqui, Mohd. Gulfam Alam, Najmul Islam, Lin Bai

  中国化学快报. 2009, 20(02): 153-157. https://doi.org/10.1016/j.cclet.2008.10.049

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Title compounds 2',2'-dimethylcholesta-2,4-dien[3,2-b]-pyran-4'-one (3), 2',2'-dimethyl-3β-substituted cholesta-4,6-dien[7,6-b]-pyran-4'-one (6a,b) and (6c) were prepared by the cyclization of 2-acetylcholesta-2,4-dien-3-ol (2), 6-acetyl-3β-substitutedcholesta-4,6-dien-7-ol (5a,b) and (5c) respectively, with pyrrolidine, dry benzene and dry acetone using Dean Stark separator through conventional heating. Furthermore, compounds were also found to be active against Mycobacterium tuberculosis.
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  Atom-efficient coupling reaction of aryl bromides with sodium tetraphenylborate catalyzed by reusable Pd/C in water under focused microwave irradiation

  Lin Bai

  中国化学快报. 2009, 20(02): 158-160. https://doi.org/10.1016/j.cclet.2008.10.050

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A rapid and heterogeneous Pd/C-catalyzed atom-efficient phenylation of aryl bromides by sodium tetraphenylborate takes place under focused microwave irradiation in water. The palladium catalyst can be easily recovered and reused.
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  Keggin type heteropolyacids-catalyzed synthesis of quinoxaline derivatives in water

  Tai Kun Huang, Lin Shi, Rui Wang, Xing Zhou Guo, Xiao Xia Lu

  中国化学快报. 2009, 20(02): 161-164. https://doi.org/10.1016/j.cclet.2008.10.048

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in excellent yields in water. This method provides a new and efficient protocol in terms of small quantity of catalyst, a wide scope of substrates, and simple work-up procedure.
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  Pd-catalyzed sequential reaction for the synthesis of fused tricyclic compounds containing a dihydrofuran or isobenzofuranone unit

  Ru Wei Shen, Shu Gao Zhu, Qin Qin Xia, Lu Ling Wu, Xian Huang

  中国化学快报. 2009, 20(02): 165-167. https://doi.org/10.1016/j.cclet.2008.10.046

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A novel Pd-catalyzed sequential reaction for the synthesis of fused tricyclic compounds with a dihydrofuran or isobenzofuranone unit was developed.
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  Controllable synthesis of novel mono-and di-terpyridine derivatives

  Peng Fei Shi, Qin Jiang

  中国化学快报. 2009, 20(02): 168-170. https://doi.org/10.1016/j.cclet.2008.10.029

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A series of novel mono-and di-terpyridine derivatives with purinyl and pyrimidyl group were obtained from the reaction of 4'-pbromomethylphenyl-2,2':6,2"-terpyridine with 6-mercaptopurine, 2,6-dimercaptopurine and thymine, respectively. The active hydrogens on these alkaloids could be abstracted stepwise using different bases, which made the addition controllable.
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  Development of mild and efficient method for synthesis of substituted flavones using oxalic acid catalyst

  Abhay S. Zambare, Jaiprakash N. Sangshetti, Nagnnath D. Kokare, Devanand B. Shinde

  中国化学快报. 2009, 20(02): 171-174. https://doi.org/10.1016/j.cclet.2008.10.042

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Oxalic acid has been used as a catalyst for intramolecular cyclisation of 2-hydroxychalcones to form flavones in good yields. The efficiency of the catalyst was proved with a variety of substrates ranging from electron-deficient to electron-rich aryl aldehydes and 2-hydroxychalcone.
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  Synthesis and positive inotropic evaluation of 1-(benzylamino)-3-(4,5-di-hydro[1,2,4]trizaolo[4,3-a]quinolin-7-yloxy)propan-2-ol derivatives

  Ting Ting Li, Ling Zhang, Zhe Shan Quan, Hai Bo Zhu, Hu Ri Piao

  中国化学快报. 2009, 20(02): 175-177. https://doi.org/10.1016/j.cclet.2008.11.003

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  In an attempt to search for more potent positive inotropic agents, a series of 1-(benzylamino)-3-(4,5-dihydro[1,2,4]trizaolo[4,3-a]quinolin-7-yloxy)propan-2-ol derivatives was synthesized in four steps using 6-hydroxy-3,4-dihydro-2(1H)-quinolinone as a starting material, and their positive inotropic activities were evaluated by measuring the coronary blood flow (CBF) and the left ventricular pressure (LVP) followed by calculating the rate of pressure development (dp/dt_max values) in the preparation of rat Langendorff's heart. Three compounds (5d, 5g, 5j) showed favorable activities, among which 5g was shown the most potent with dp/dt_max value of 9.7% and CBF value of 17.8% at a concentration of 1×10^-5 mol/L in our in vitro study.
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  Synthesis of novel methotrexate derivatives with inhibition activity of nitric oxide synthase

  Ming Sheng Feng, Ping Guo, Li Xun Jiang, Jing Bo Shi, Yu Ping Cao, Qi Zheng Yao

  中国化学快报. 2009, 20(02): 178-180. https://doi.org/10.1016/j.cclet.2008.10.027

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Seventeen 4-alkylamino/arylamino-substituted methotrexate (MTX) derivatives 6a-14a were designed and synthesized. Their inhibition activities against inducible nitric oxide synthase (iNOS) were evaluated in vitro. The pharmacological results showed that most of the prepared compounds displayed the potent inhibitory effects on iNOS.
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  A new aryl glycoside from Euphorbia helioscopia L.

  Wei Sheng Feng, Li Gao, Xiao Ke Zheng, Yan Zhi Wang

  中国化学快报. 2009, 20(02): 181-183. https://doi.org/10.1016/j.cclet.2008.10.035

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new aryl glycoside, 3"-O-galloyl-benzyl-O-a-L-rhamnopyranosyl-(1→6)-b-D-glucopyranoside, was isolated from Euphorbia helioscopia L., and its structure was elucidated on the basis of various spectroscopic data analysis.
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  Two new monoterpene glycosides from Doellingeria scaber

  Su Ping Bai, Bao Ying Wang, Yun Jing

  中国化学快报. 2009, 20(02): 184-186. https://doi.org/10.1016/j.cclet.2008.10.033

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Two new methane-type monoterpene glycosides were isolated from the roots of Doellingeria scaber. Their structures were identified as trans-p-menthane-1a,2β,8-triol 8-O-β-D-(3',6'-diangeloyloxy)-glucopyranoside and trans-p-menthane-1a,2β,8-triol 8-O-β-D-(3'-angeloyloxy,6'-isobutyloxy)-glucopyranoside based on 1D and 2D NMR spectroscopy.
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  A new depsidone from Usnea diffracta

  Huan Yang Qi, Yuan Peng Jin, Yan Ping Shi

  中国化学快报. 2009, 20(02): 187-189. https://doi.org/10.1016/j.cclet.2008.10.032

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new depsidone, diffractione A (1), as well as six known phenolic compounds (2-7) were isolated from Usnea diffracta. Their structures were elucidated by 1D and 2D NMR spectroscopy together with HRESIMS analysis. All components were obtained for the first time from U. diffracta.
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  A new rearranged chamigrane sesquiterpene from Laurencia okamurai

  Yi Liang, Xiao Ming Li, Chuan Ming Cui, Chun Shun Li, Bin Gui Wang

  中国化学快报. 2009, 20(02): 190-192. https://doi.org/10.1016/j.cclet.2008.11.001

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new rearranged chamigrane sesquiterpene, named laurenokamurin, was isolated from the marine red alga Laurencia okamurai. Its structure was determined on the basis of spectroscopic methods.
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  Cytotoxic triterpenoid saponins from Ardisia pusilla

  Hai Feng Tang, Hou Wen Lin, Xiao Li Chen, Guang Cheng, Yue Ping Zhao, Ai Dong Wen

  中国化学快报. 2009, 20(02): 193-196. https://doi.org/10.1016/j.cclet.2008.10.030

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new triterpenoid saponin, 3-O-{β-D-xylopyranosyl-(1→2)-b-D-glucopyranosyl-(1→4)-[β-D-glucopyranosyl-(1→2)]-a-L-arabinopyranosyl}-3β,16α,28α-trihydroxy-13β,28-epoxy-oleanan-30-al (ardipusilloside Ⅲ, 1), together with two known saponins,ardisiacrispins A (2) and B (3), were isolated from the whole plants of Ardisia pusilla A. DC. Their structures were elucidated by extensive spectral analysis and chemical evidences. Saponins 1 and 3 exhibited significant cytotoxicity against human glioblastoma U251MG cells.
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  Two new terpenoids from fruits of Ziziphus jujuba

  Sheng Guo, Yu Ping Tang, Jin Ao Duan, Shu Lan Su, An Wei Ding

  中国化学快报. 2009, 20(02): 197-200. https://doi.org/10.1016/j.cclet.2008.10.041

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  One new ceanothane-type triterpene and one new sesquiterpene, together with two known triterpenes were isolated from the fruits of Ziziphus jujuba Mill. (Rhamnaceae). Based on the spectral analyses, the structures of two new compounds were elucidated as 2a-aldehydo-A(1)-norlup-20(29)-en-27,28-dioic acid (zizyberanal acid) (1<、b>), and zizyberanone (2). While the two known triterpenes were identified as zizyberanalic acid (3) and ursolic acid (4).
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  Two new ent-kaurane diterpenoids from Isodon excisoides

  Ji Xia Zhang, Yong Xue Wang, Zhi An He, Fu Lin Yan, Han Dong Sun

  中国化学快报. 2009, 20(02): 201-203. https://doi.org/10.1016/j.cclet.2008.10.040

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Two new ent-kaurane diterpenoids taihangexcisoidesin A and B (1 and 2), were isolated from the EtOAc extract of the leaves of Isodon excisoides. Their structures were determined on the basis of spectroscopic methods.
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  Direct observation of the autophosphorylation of insulin receptor kinase by mass spectrometry

  Zhi Li Li

  中国化学快报. 2009, 20(02): 204-206. https://doi.org/10.1016/j.cclet.2008.10.043

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  The catalytic and signaling activities of insulin receptor kinase (IRK) are regulated by the autophosphorylation of three tyrosine residues in a cytoplasmic protein-tyrosine kinase domain at Tyro 1158, Tyro 1162 and Tyro 1163. In this study, time-course of the auphosphorylation of the core kinase (residues 978-1283) from IRK was directly investigated by online electrospray ionization mass spectrometry. It is found that two tyrosine residues were phosphorylated in reaction time range of 30 min. This study implies that mass spectrometric technique must be a powerful tool to directly monitor the biological macromolecular modification and will also provide the information of the order and the mechanism of autophosphorylation at the tyrosine sites coupled with tandem mass spectrometric technique.
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  Determination of toluene diisocyanate in synthetic-rubber track by ion chromatography with ultraviolet detection after alkaline suppressor

  Mei Lan Chen, Yun Chang Fan, Chang An Li, Dong Fei, Yan Zhu

  中国化学快报. 2009, 20(02): 207-209. https://doi.org/10.1016/j.cclet.2008.10.036

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  In the present work, a novel analytical method was proposed for the determination of toluene diisocyanate (TDI) in syntheticrubber track by ion chromatography (IC) coupled with an ultraviolet detector setting at 212 nm. TDI can be hydrolyzed to toluene diamine (TDA) which can be separated by cation-exchange IC easily. The optimum IC separation was performed on an IonPac CS12A column (150 mm×4.0 mm) using 20 mmol L^-1 sodium sulfate, 10 mmol L^-1 sulfuric acid and 10% acetonitrile as eluent.It was found that a higher signal response of TDA could be obtained under alkaline condition. A suppressor was used to change the acidic eluent into alkaline one. 0.8 mol L^-1 potassium hydroxide was chosen as the optimum regeneration eluent. With the added suppressor and regenerant, signal response was magnified by about 16 times and lower limit of detection (LOD, 0.13μg L^-1) was obtained. Within-day relative standard deviation (R.S.D.) was less than 3.6%. The recoveries of TDI spiked in synthetic-rubber track samples were 96.4-110.6%.
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  Study on mode-filtered light sensor for methane detection

  Suo Zhu Wu, Shao Min Shuang, Yan Zhang, Zhong Ping Li, Martin M. F. Choi, Cai Hong Zhang, Chuan Dong

  中国化学快报. 2009, 20(02): 210-212. https://doi.org/10.1016/j.cclet.2008.11.006

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A novel mode-filtered light gas sensor has been reported. It was constructed by inserting an optical fiber deposited by a thin silicone cladding of cryptophane A into a fused-silica capillary. When different concentration of methane gas was introduced to the sensor, the phenomenon that mode-filtered light intensity decreased with the increasing concentration of methane was observed. And a linear relationship was obtained within the methane concentration range of 0.0-16.0% (v/v). The detection limit was 0.06% (v/v). The mode-filtered light sensor has been exploited to respond to various concentrations of methane gas at room temperature.
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  Novel method for the determination of five carbamate pesticides in water samples by dispersive liquid-liquid microextraction combined with high performance liquid chromatography

  Zhi Mei Liu, Xiao Huan Zang, Wei Hua Liu, Chun Wang, Zhi Wang

  中国化学快报. 2009, 20(02): 213-216. https://doi.org/10.1016/j.cclet.2008.10.047

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A novel method for the determination of five carbamate pesticides (metolcarb, carbofuran, carbaryl, isoprocard and diethofencard) in water samples was developed by dispersive liquid-liquid microextraction (DLLME) coupled with high performance liquid chromatography-diode array detector (HPLC-DAD). Some experimental parameters that influence the extraction efficiency were studied and optimized to obtain the best extraction results. Under the optimum conditions for the method, the calibration curve was linear in the concentration range from 5 to 1000 ng mL^-1 for all the five carbamate pesticides,with the correlation coefficients (r²) varying from 0.9984 to 0.9994. Good enrichment factors were achieved ranging from 80 to 177-fold, depending on the compound. The limits of detection (LODs) (S/N=3) were ranged from 0.1 to 0.5 ng mL^-1. The method has been successfully applied to the analysis of the pesticide residues in environmental water samples.
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  Electroanalysis and simultaneous determination of dopamine and epinephrine at poly(isonicotinic acid)-modified carbon paste electrode in the presence of ascorbic acid

  Yuan Zhen Zhou, Li Juan Zhang, Shuang Li Chen, She Ying Dong, Xiao Hui Zheng

  中国化学快报. 2009, 20(02): 217-220. https://doi.org/10.1016/j.cclet.2008.10.026

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A carbon paste electrode modified with electropolymerized films of isonicotinic acid was developed. The modified electrode shows excellent electrocatalytic activity toward the oxidation of both dopamine (DA) and epinephrine (EP). Separation of the reduction peak potentials for dopamine and epinephrine was about 357 mV in pH 5.3 phosphate buffer solution (PBS) and the character was used for the detection DA and EP simultaneously. The peak currents increase linearly with DA and EP concentration over the range of 8.0×10^-5 to 7.0×10^-4 mol/L and 5.0×10^-6 to 1.0×10^-4 mol/L with detection limits of 2×10^-5 and 1×10^-6 mol/L, respectively. The interference studies showed that the modified electrode exhibits excellent selectivity in the presence of large excess of ascorbic acid (AA).
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  2,3-Dimercaptosuccinic acid self-assembled gold electrode for the simultaneous determination of epinephrine and dopamine

  Wei Jun Kang, Ling Mei Niu, Li Ma

  中国化学快报. 2009, 20(02): 221-224. https://doi.org/10.1016/j.cclet.2008.10.039

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Simultaneous determination of epinephrine (EP) and dopamine (DA) at 2,3-dimercaptosuccinic acid (DMSA) modified electrode was studied. The oxidation peaks of the mixture of EP and DA appeared at the same potential, but the cathodic peak currents were only linear to the concentration of DA, whereas the anodic peak currents were equal to the sum of individual anodic peak currents of EP and DA. Therefore, a novel electrochemical method for the simultaneous determination of EP and DA at a DMSA modified electrode (DMSA/Au electrode) by cyclic voltammetry was established. The DMSA self-assembled electrode showed good sensitivity, selectivity and stability and could be used to determine DA and EP, simultaneously, in the real application with satisfactory results.
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  Phytoremediation of industrial effluent containing azo dye by model up-flow constructed wetland

  S. A. Ong, K. Uchiyama, D. Inadama, Y. Ishida, K. Yamagiwa

  中国化学快报. 2009, 20(02): 225-228. https://doi.org/10.1016/j.cclet.2008.10.028

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  This study assessed the treatment of azo dye Acid Orange 7(AO7) containing wastewater by laboratory-scale up-flow constructed wetland (UFCW) with and without supplementary aeration. The supplementary aeration could effectively control the ratio of anaerobic and aerobic zones in the UFCW reactor. The results clearly show the supplementary aeration boosted the biodegradation of organic pollutants and mineralization of intermediate aromatic amines formed by AO7 degradation.
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  Synthesis of a new aromatic dianhydride monomer and related polyimide

  Yun Xia Wei, Ming Guang Ma, Guo Hu Zhao, Sheng Ying Li, Ming Kai Chen

  中国化学快报. 2009, 20(02): 229-230. https://doi.org/10.1016/j.cclet.2008.10.031

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A novel aromatic dianhydride monomer, 3,3'-oxybis[(3,4-dicarboxyphenoxy)phenol] dianhydride, was successfully synthesized in three steps using 3,3'-oxybis(phenol) as starting material, which was reacted with 4,4'-oxydianiline (ODA) via a conventional thermal or chemical imidization method to produce a new polyimide. The resulting polyimide exhibited excellent solubility, and film-forming capability.
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  Optically active micelles from self-assembly of MPEG-b-PMALM copolymer in water

  Fa Bao Zhao, Zhi Lei Liu, Jian Ping Sun, Liang Feng, Ji Wen Hu

  中国化学快报. 2009, 20(02): 231-234. https://doi.org/10.1016/j.cclet.2008.10.044

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Reported here is fabrication of optically active micelles with broad range of morphologies in water, such as spheres, cylinders,and vesicles, from self-assembly of poly(ethylene glycol) monomethyl ether-b-poly-(methacryloyl-L-leucine methyl ester) (MPEG-b-PMALM) copolymer, which was prepared via atom transfer radical polymerization (ATRP) from vinyl monomer bearing chiral amino acid moieties, N-methacryloyl L-leucine methyl ester (MALM), using bromine (Br) end-capped poly(ethylene golycol) monomethylether (MPEG-Br) as macroinitiator in the presence of CuBr/Me₆TREN as catalytic system.
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  Synthesis and characterization of conjugated polymer containing azobenzene and oxadiazole units

  Yue Zhang, Shi Jun Yu, Lu Wang, Cong Li

  中国化学快报. 2009, 20(02): 235-237. https://doi.org/10.1016/j.cclet.2008.10.002

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A novel conjugated polymer containing azobenzene and oxadiazole units was synthesized through multi-step synthesis. The structures and properties of monomer and polymer were characterized and evaluated with IR, ¹H NMR, UV, TGA and GPC,respectively. Polymer with long side chain of alkoxy shows good solubility, thermal stability and photoisomerization property.
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  Direct amination of benzene to aniline with several typical vanadium complexes

  Yu Fen LÜ, Liang Fang Zhu, Qiu Yuan Liu, Bin Guo, Xiao Ke Hu, Chang Wei Hu

  中国化学快报. 2009, 20(02): 238-240. https://doi.org/10.1016/j.cclet.2008.11.005

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  The liquid-phase direct catalytic amination of benzene to aniline was performed in acetic acid water solvent using a series of vanadium (Ⅲ, Ⅳ, Ⅴ) complexes with N,O-or O,O-ligands as catalysts and hydroxylamine hydrochloride as the aminating agent.The vanadium complexes exhibited much higher selectivity towards the production of aniline than NaVO₃ or VOSO₄. Under the optimized conditions, an aniline yield of 42.5% and a TON of 48 with a high selectivity of above 99.9% was obtained using 0.2 mmol of [VO(OAc)₂] as the catalyst.
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  Facile synthesis of gold nanoplates by thermally reducing AuCl₄^- with aniline

  Kang Xu, Zhi rui Guo, Ning Gu

  中国化学快报. 2009, 20(02): 241-244. https://doi.org/10.1016/j.cclet.2008.10.053

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  We herein report a one-step, wet-chemical approach to synthesizing gold nanoplates in large quantities via the AuCl₄^- thermal reduction process by aniline, without introducing additional capping agent or surfactant. It is found that the reduction kinetics of AuCl₄^- is greatly altered by varying the initial molar ratio of aniline to AuCl₄^-. Moreover, further investigation reveals that the insitu formed polyaniline could serve effectively as a capping agent to preferably adsorb the {111} facets of gold crystals during a slow reduction process, directing the formation of gold nanoplates.
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  Contribution to thermochemical studies of 0.8[xB₂O₃-(1-x)SiO₂]-0.2Na₂O glasses

  A. P. Ahoussou, J. Rogez, A. Yapi, V. Mikalean, A. Kone

  中国化学快报. 2009, 20(02): 245-249. https://doi.org/10.1016/j.cclet.2008.10.010

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  Calorimetric measurements in 0.8[xB₂O₃-(1-x)SiO₂]-0.2Na₂O glasses and melts are performed in HF calorimetry at 298 K and lead borate calorimetry at 973 K, respectively. Mixing enthalpy is affected by both temperature and composition. At 298 K, the mixing enthalpies are slightly negative and components are miscible at that temperature in the whole composition range. At 973 K,the sign of the mixing enthalpies reflect the tendency to phase separation at silica-rich compositions, which is avoided for kinetic reasons as shown by SEM results. Therefore, one is tempted to consider the quenched 0.8[xB₂O₃-(1-x)SiO₂-0.20Na₂O] glasses and melts as single-phase materials.
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  Novel Ba_0.5Sr_0.5Fe_0.8Zn_0.2O_3-δ membranes for POM

  Hui Xia Luo, Ling Hui Yu, Xin Zhi Chen, Hai Hui Wang, JÜrgen Caro

  中国化学快报. 2009, 20(02): 250-252. https://doi.org/10.1016/j.cclet.2008.10.011

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  A novel cobalt-free perovskite based on Ba_0.5Sr_0.5Fe_0.8Zn_0.2O_3-δ (BSFZ) were prepared by EDTA-citric acid method. The lattice constants of the BSFZ perovskite were characterized by in situ high-temperature X-ray diffraction (HTXRD). The thermal expansion coefficient of BSFZ is 10.5×10^-6 K^-1, which is lower than that of cobalt-based perovskite materials. The BSFZ membrane was also used to construct reactors for the partial oxidation of methane (POM) to syngas. Results show that the BSFZ membrane can be operated for the POM reaction for more than 100 h without any fractures. The CO selectivity of 97% is obtained.The steady oxygen permeation flux reaches around 2.5 mL/min cm² during POM reaction.