中国化学快报

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1, 3-Dicarbonyl compounds as phosphine-free ligands for Pd-catalyzed Heck and Suzuki reactions

Xin Cui, Juan Li, Lei Liu, Qing Xiang Guo

中国化学快报. 2007, 18(06): 625-628. https://doi.org/10.1016/j.cclet.2007.04.014

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Some 1, 3-dicarbonyl compounds (such as pentane-2, 4-dione and 3-oxo-N-phenylbutanamide) were found to constitute highly efficient, yet low-priced and phosphine-free ligands for the Pd-catalyzed Heck and Suzuki reactions of aryl bromides and iodides with very high turnover numbers (ca.10³-10⁴).

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A novel reductive ring-opening reaction of isoxazolidine to form functionalized 1, 3-aminoalcohol

Hong Kui Zhang, Wing Hong Chan, Albert W. M. Lee, Ping Fang Xia, Wai Yeung Wong

中国化学快报. 2007, 18(06): 629-632. https://doi.org/10.1016/j.cclet.2007.04.001

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Reductive cleavage of the N-O bond of isoxazolidine ring with catalytic hydrogenation over Raney nickel was described.Bicyclic isoxazolidines could be effectively converted into the corresponding 1, 3-amino-alcohol possessing a sultone or sultam moiety with high conversion and yield when the hydrogenation was catalyzed by freshly prepared Raney nickel under a pressure of 40 psi in the presence of triethylamine.

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Synthesis of multi-hydroxyl and sulfonyl dual-functionalized room temperature ionic liquids

Guo Yang Zhu, Rong Wang, Guo Hua Liu, Li Qun Xu, Bei Zhang, Xia Qin Wu

中国化学快报. 2007, 18(06): 633-635. https://doi.org/10.1016/j.cclet.2007.04.012

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Starting from the hydroxylamine (dimethyl amino ethanol, triethanolamine) and 1, 3-propane sultone, a series of hydroxyl and sulfonyl dual-functionalized zwitterionic salts and corresponding acidic room temperature ionic liquids have been synthesized.The hydroxyl groups of the synthesized substances were confirmed by the ¹H NMR measurement.These zwitterionic salts and ionic liquids may be used for synthesizing other functionalized ionic liquids or ionic liquid-polymer (polyelectrolyte).

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Synthesis of 2H-3, 1-pyrazolo[3, 4-e]oxazines via a new conversion of Friedl（a）nder reaction

Jia Rong Li, Li Jun Zhang, Jin Nan Chen, Xi Quan Yang, Li Jun Wang, Xiao Fan Zhao, Jun Xia Qiu

中国化学快报. 2007, 18(06): 636-638. https://doi.org/10.1016/j.cclet.2007.04.015

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2H-3, 1-Pyrazolo[3, 4-e]oxazines (5a-c) and tacrine analogies (6a-c) were designed and prepared using 5-amino-4-cyanopyrazole (7) and cycloketones (2a-c) as reactants.The study demonstrated that the new conversion existed in the Friedländer reaction of o-aminocyanopyrazole with cycloketones.

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Synthesis of azo derivatives of 4-aminosalicylic acid

Zheng Bao Zhao, Hui Xia Zheng, Yuan Gui Wei, Jiang Liu

中国化学快报. 2007, 18(06): 639-642. https://doi.org/10.1016/j.cclet.2007.04.031

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For searching a better 4-aminosalicylic acid derivative with higher activity and less side effects against the inflammatory bowel disease, 4-aminosalicylic acid (4-ASA) was protected by benzyloxycarbonyl and acetyl, respectively.The resultant was hydrogenized to remove protective group of amino group, then the product was reacted with NaNO₂ to give diazonium salt, which was conjugated with salicylic acid, hydroxybenzene, N-salicyloyl glycine acid to get azo derivatives of 4-ASA.The azo derivatives were hydrolyzed under the alkaline condition to get the target products.All compounds were characterized by FT-IR, ¹H NMR, ¹³C NMR spectra in details.New derivatives of 4-ASA were characterized.The synthetic route was reasonable and feasible.

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Microwave-assisted Kornblum oxidation of organic halides

Gang Xu, Jian Ping Wu, Xin Miao Ai, Li Rong Yang

中国化学快报. 2007, 18(06): 643-646. https://doi.org/10.1016/j.cclet.2007.04.003

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Microwave-assisted Kornblum oxidation is proved to be an effective way to obtain aldehyde and ketones from their corresponding chlorides.Under microwave irradiation, not only the reaction time was greatly decreased, due to avoiding the by-product, the yield was increased.It is noteworthy that the scope of the method was broadly expanded.

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An efficient and solvent-free one-pot synthesis of dihydropyrimidinones under microwave irradiation

Cheng Jiang, Qi Dong You

中国化学快报. 2007, 18(06): 647-650. https://doi.org/10.1016/j.cclet.2007.04.002

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An efficient synthesis of 3, 4-dihydropyrirnidin-2(1H)-one derivatives using formic acid as catalyst, from aldehydes, β-ketoester and urea (thiourea) without solvent under the irradiation of microwave is described.Compared with the classical Biginelli reaction, this new method has the advantage of good yields (77-94% for aromatic aldehydes) and short reaction time (3-8 min).

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First total synthesis of (±)-trolline

Qiu Qin He, Chao Mei Liu, Ke Li

中国化学快报. 2007, 18(06): 651-652. https://doi.org/10.1016/j.cclet.2007.04.032

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Trolline, a new bioactive alkaloid was isolated in 2004.We reported herein the first total synthesis of (±)-trolline, in two steps and 18.0% overall yield.

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Stereoselective synthesis of 3-butylphtalide via CBS catalytic reduction

Geng Xu, Zhan Zhu Liu, Jing Hua Yang, Shi Zhi Chen, Hui Ying Yang

中国化学快报. 2007, 18(06): 653-655. https://doi.org/10.1016/j.cclet.2007.04.040

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Optically active 3-butylphtalide of high enantiomeric excesses (up to 93% e.e.) was synthesized from the reduction of o-pentanoylbenzoic ester with borane using B-methyloxyoxazaborolidine (1b) as the chiral catalyst.

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A facile synthesis of 2-substituted-2, 3-dihydro-4(1H)-quinazolinones in 2, 2, 2-trifluoroethanol

Rong Zhang Qiao, Bai Ling Xu, Yan Hui Wang

中国化学快报. 2007, 18(06): 656-658. https://doi.org/10.1016/j.cclet.2007.04.036

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2-Substituted-2, 3-dihydro-4(1H)-quinazolinones Were obtained in high yields by condensation of anthranilamide with aryl, alkyl or heteroaryl aldehydes or ketones in the refluxing 2, 2, 2-trifluoroethanol without any catalyst.

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Synthesis and antitumor activities of structure-related small molecular compounds of gambogic acid

Nian Guang Li, Qi Dong You, Xue Feng Huang, Jin Xin Wang, Qing Long Guo, Xiao Guang Chen, Yan Li, Hong Yan Li

中国化学快报. 2007, 18(06): 659-662. https://doi.org/10.1016/j.cclet.2007.04.010

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Through simplifying the complicated skeleton of the natural product gambogic acid, two series derivatives of chromone and xanthone were synthesized and examined for their antitumor activities against several cancer cells in vitro by MTT method.The results showed that appropriate introduction of prenyl group to the small molecular compounds could elevate their antitumor activities.The structure-activities relationship of synthesized compounds certified that the bridgecore in gambogic acid was very important for keeping its antitumor activities.

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Design, synthesis and molecular docking studies of novel triazole antifungal compounds

Qiu Qin He, Ke Li, Yong Bing Cao, Huan Wen Dong, Li Hua Zhao, Chao Mei Liu, Chun Quan Sheng

中国化学快报. 2007, 18(06): 663-666. https://doi.org/10.1016/j.cclet.2007.04.025

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Based on the active site of Candida albicans lanosterol 14α-demethylase (CACYP51), novel triazole compounds structurally different from the current triazole drugs were designed and synthesized.In vitro antifungal activities showed that compounds 10, 11, 16 and 20 exhibited strong activities.In addition, compounds 10, 11 and 16 also displayed certain activities against fluconazole-resistant fungi.

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Synthesis and application of rhodamine-based fluorescent probe dyes with spacer linker arm

Yong Gao, Jian Li Li, Zhen Shi

中国化学快报. 2007, 18(06): 667-669. https://doi.org/10.1016/j.cclet.2007.04.007

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When rhodamine-based fluorescent probe dyes are used to track target molecules they always perturb the behavior of target molecules because of steric hindrance effect.In order to minimize potential steric problems, a kind of rhodamine-based fluorescent probe dye with spacer linker arm was designed and synthesized and its application in immunofluorescence histochemistry was investigated.

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Design, synthesis and antifungal activity of novel triazole derivatives

Qing lie Zhao, Yan Song, Hong Gang Hu, Shi Chong Yu, Qiu Ye Wu

中国化学快报. 2007, 18(06): 670-672. https://doi.org/10.1016/j.cclet.2007.04.019

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Twenty-three 1-(1H-1, 2, 4-triazole-1-yl)-2-(2, 4-difluorophenyl)-3-(N-cycloproyl-N-substituted-amino)-2-propanols were designed and synthesized on the basis of the active site of lanosterol 14α-demethylase.In vitro antifungal activities showed that some of the title compounds had higher antifungal activity and broader antifungal spectrum than fluconazole.

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Novel endo-to exo-isomerization of dicyclopentadiene

Xiang Wen Zhang, Kai Jiang, Qiang Jiang, Ji Jun Zou, Li Wang, Zhen Tao Mi

中国化学快报. 2007, 18(06): 673-676. https://doi.org/10.1016/j.cclet.2007.03.005

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Endo-dicyclopentadiene was isomerized to exo-isomer by thermal treatment at evaluated temperature and pressure.The reaction temperature and pressure are key factors for this novel isomerization.This result may have great potential for practical application.

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Biocatalytic synthesis of (R)-(-)-mandelic acid from racemic mandelonitrile by a newly isolated nitrilase-producer Alcaligenes sp. ECU0401

Yu Cai He, Jian He Xu, Yi Xu, Li Ming Ouyang, Jiang Pan

中国化学快报. 2007, 18(06): 677-680. https://doi.org/10.1016/j.cclet.2007.04.034

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By using acetonitrile as the sole nitrogen source, a microbial strain with high nitrilase activity, named as Alcaligenes sp.ECU0401, was newly isolated from soil, which could enantioselectively transform racemic mandelonitrile into (R)-(-)-mandelic acid, with an enantiomeric excess of >99.9%.

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Baker's yeast mediated reduction of substituted acenaphthenequinones: Regio- and enantioselective preparation of mono-hydroxyacenaphthenones

Xing Yong Wang, Jing Nan Cui, Wei Min Ren, Feng Li, Chun Liang Lu, Xu Hong Qian

中国化学快报. 2007, 18(06): 681-684. https://doi.org/10.1016/j.cclet.2007.04.022

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Baker's yeast mediated reduction of acenaphthenequinone within 4-10 h afforded mono-hydroxyacenaphthenone mainly with low enantioselectivity, the substrate and mono-hydroxyacenaphthenone product almost converted to dihydroxyacenaphthene after 48 h.By control of the reaction time and in the presence of DMF as co-solvent, the reduction of 6-substituted acenaphthenequinones under vigorous agitation afforded the corresponding 2-hydroxyacenaphthenones in 24-84% yields with 10-93% ee.

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Partial hydrogenation of adiponitrile to 6-aminocapronitrile over Ni/α-Al₂O₃ catalyst promoted with K₂O and La₂O₃

Lei Zhao, Cai Yun Wang, Ji Xiang Chen, Ji Yan Zhang

中国化学快报. 2007, 18(06): 685-688. https://doi.org/10.1016/j.cclet.2007.04.008

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A novel K₂O and La₂O₃ promoted nickel catalyst supported on α-Al₂O₃ was prepared by co-impregnation method, and it exhibited higher activity and 6-aminocapronitrile selectivity than Ni/α-Al₂O₃ during the hydrogenation of adiponitrile in the absence of ammonia, i.e., K₂O and La₂O₃ improved the performance of the nickel-based catalyst.

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Synthesis and mass spectral fragmentations of new spiro heterocycles

Mohammad Rahimizadeh, All Shiri, Mehdi Bakavoli

中国化学快报. 2007, 18(06): 689-693. https://doi.org/10.1016/j.cclet.2007.04.020

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The reaction of dichlorodiphenoxymethane (2) with orthio-functionlized benzoic acids 1a-c yielded the spiro derivatives of bezodioxinone 4a, benzoxazinone 4b and benzodioxepinone 4c.The same reaction with 1, 8-diaminonaphthalene afforded the spiro perimidine 6, while with 1, 1'-binaphthyl-2, 2'-diol gave the semi-cyclized derivative 2, 2-diphenoxydinaphthodioxepine 8.

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Two new isoflavonoids from the rhizomes of Belamcanda chinensis

Zhi Jun Song, Fan Luo, Yan Zhou, Bin Ru Bai, Shu Lin Peng, Li Sheng Ding

中国化学快报. 2007, 18(06): 694-696. https://doi.org/10.1016/j.cclet.2007.04.004

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Two new isoflavonoids, 6-methoxy-5, 7, 8, 4'-tetrahydryoxyisoflavone (1) and 4'-methoxy -5, 6-dihydroxyisoflavone-7-O-β-D-glucopyranoside (2), were isolated from the rhizomes of Belamcanda chinensis (L.) DC.Their structures were elucidated by extensive spectroscopic evidence including 1D NMR, 2D NMR, MS and IR spectra.

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Alkaloids from stems of Ervatamia yunnanensis

Xin Gen Luo, Hai Sheng Chen, Shuang Liang, Mao Huang, Wei Dong Xuan, Li Jin

中国化学快报. 2007, 18(06): 697-699. https://doi.org/10.1016/j.cclet.2007.04.013

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Six indole alkaloids were isolated from the stems of Ervatamia yunnanensis.Among them, yunnanensine (Ⅰ) is new.The other five are known alkaloids, namely:19, 20-E-vallesamine (Ⅱ), 19s-heyneanine (Ⅲ), ibogaine (Ⅳ), ibogamine (Ⅴ), coronaridine (Ⅵ).The structural elucidation of the alkaloids was based on spectral means.

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Three new C₁₉-diterpenoid alkaloids from Delphinium laxicymosum var. Pilostachyum

Ping Tang, Dong Lin Chen, Qiao Hong Chen, Xi Xian Jian, Feng Peng Wang

中国化学快报. 2007, 18(06): 700-703. https://doi.org/10.1016/j.cclet.2007.04.026

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Three new lycoctonine-type C₁₉-diterpenoid alkaloids, laxicymine 1, laxicymisine 2, and laxicyminine 3 have been isolated from the whole herb of Delphinium laxicymosum var. pilostachyum W.T.Wang.Their structures were established by spectra data.

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Two new C₁₉-diterpenoid alkaloids from roots Aconitum hemsleyanium var. atropurpureum

Pei Tang, Dong Lin Chen, Xi Xian Jian, Feng Peng Wang

中国化学快报. 2007, 18(06): 704-707. https://doi.org/10.1016/j.cclet.2007.04.028

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A new franchetine-type C₁₉-diterpenoid alkaloid 3-hydroxyfranchetine 1 and a new aconitine-type C₁₉-diterpenoid alkaloid atropurpursine 2 have been isolated from the roots of Aconitum hemsleyanium var. atropurpureum.The structures of these new alkaloids were established on the basis of spectral data.

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Two new olean-type triterpene fatty esters from Scorzonera mongolica

Bin Wang, Guo Qiang Li, Pei Ju Qiu, Hua Shi Guan

中国化学快报. 2007, 18(06): 708-710. https://doi.org/10.1016/j.cclet.2007.04.009

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Two new triterpene fatty esters, 3β-tetradecanoyl moradiol 1 and 3β-dodecanoyl moradiol 2, were isolated from Scorzonera mongolica.Their structures were elucidated as 3β-tetradecanoyloxy-28-hydroxylolean-18-ene and 3β-dodecanoyl-28-hydroxyl-olean-18-ene on the basis of IR, MS, 1D NMR and extensive 2D NMR spectroscopic analyses.

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Determination of trace arsenic(V) by catalytic solid substrate-room temperature phosphorescence quenching method

Guo Hui Zhu, Zhi Ming Li, Xiao Hua Chen, Jia Ming Liu, Tian Long Yang, Wen Qian Zhang, Shao Xian Lin, Ping Zhou

中国化学快报. 2007, 18(06): 711-713. https://doi.org/10.1016/j.cclet.2007.04.017

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In the H₂SO₄ medium and in the presence of dodecylbenzene sulfonic acid sodiumsalt (DBS), dimethyl yellow (R) could emit strong and stable solid substrate room temperature phosphorescence (RTF) on filter paper.And NaIO₄ could oxidize R to cause the RTF quenching.Arsenic (V) could catalyze the reaction of NaIO₄ oxidizing R, which caused the RTF sharply quenching.The reducing value of phosphorescence intensity (△I_p) for the system with DBS is 3.3 times higher than that without DBS.Moreover, the △I_p is proportional to the concentration of As (V).Based on the facts above, a new RTF quenching method for the determination of trace As (V) has been established.

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Preconcentration of copper with multi-walled carbon nanotubes pretreated by potassium permanganate cartridge for solid phase extraction prior to flame atomic absorption spectrometry

Jun Ping Xiao, Qing Xiang Zhou, Hua Hua Bai

中国化学快报. 2007, 18(06): 714-717. https://doi.org/10.1016/j.cclet.2007.04.024

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A procedure for the preconcentration of copper was described in this paper using multi-walled carbon nanotubes (MWCNTs) oxidized by potassium permanganate as the adsorbent for the enrichment of trace copper in water samples.Important parameters, such as the sample pH, the concentration and volume of eluent, sample flow rate and volume, and interference of coexisting ions, were investigated.The obtained results indicated that proposed method possessed an excellent analytical performance.The linear range, the detection limit, and precison (RSD) were 1-100 ng/mL (R²=0.9993), 0.32 ng/mL and 2.88%, respectively.The results showed that copper could be adsorbed quantitatively on the pretreated MWCNTs with potassium permanganate, and proposed method was very useful in the monitoring of copper in the environment.

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A novel sample preparation method of matrix-assisted laser desorption/ionization time of flight mass spectrometry for polystyrene

Shu Zhang, Zhen Wen Zhao, Lei Xiong, Bin Xin, Wei Hua Hu, Shao Xiang Xiong

中国化学快报. 2007, 18(06): 718-721. https://doi.org/10.1016/j.cclet.2007.04.027

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A novel sample preparation method of matrix-assisted laser desorption/ionization mass spectrometry for polystyrene was reported.Compared to the conventional dried-droplet method, the efficiency of ionization and signal intensity of mass spectra were improved.The mechanism was also analyzed.

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A spectral study of the interaction between chelerythrine chloride and cytidine

Xiao Yan Zhang, Quan Ling Suo, Xiong Hui Wei

中国化学快报. 2007, 18(06): 722-725. https://doi.org/10.1016/j.cclet.2007.04.023

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To study the possible anticancer mechanisms of chelerythrine (CHE), and its interactions with cytidine were investigated by UV-vis spectrophotometric and spectrofluorimetric measurements and by thermodynamic calculations.The binding of CHE to cytidine could be characterized by the hypochromic and bathochromic effects in the absorption bands, and the quenching of fluorescence intensity.The spectral data were fit by linear analysis, yielding a binding constant of 2.49×10⁴ L mol^-1at 25℃ of CHE and cytidine, and a van't Hoff enthalpy of -20.02 kJ/mol for the exothermic interaction in the standard state.In addition, with △_rG_M^Θ=-25.09 kJ/mol and △_rS_m^Θ=17.01 J/molK, the interactions should be entropy-driven.

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Study on the interaction between clarithromycin and bovine serum albumin in the imitated physiology solution

She Ying Dong, Chun Xia Xue, Ting Lin Huang

中国化学快报. 2007, 18(06): 726-729. https://doi.org/10.1016/j.cclet.2007.04.033

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The interaction between clarithromycin (CAM) and bovine serum albumin (BSA) was investigated using linear-sweep voltammetry in pH 7.4 phosphate buffer solution where CAM caused two irreversible reduction waves P₂ and P₃ on mercury electrode.The study showed that the formation constant and formation ratio for the interaction between CAM and BSA were 1.51×10¹² and 3:1 for P₂, 4.53×10⁵ and 1:1 for P₃, respectively.The ion strength enhanced the hydrophobic interaction between CAM and BSA.

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Determination of aniline in environmental water samples by alternating-current oscillopolarographic titration

Jun Ping Xiao, Qing Xiang Zhou, Xiao Ke Tian, Hua Hua Bai, Xian Fa Su

中国化学快报. 2007, 18(06): 730-733. https://doi.org/10.1016/j.cclet.2007.04.030

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A new method for the determination of aniline in environmental water based on oscillopolarographic titration was presented in this paper.Several factors including the kind, concentration, and volume of acid, the dosage of potassium bromide, the temperature and concentration of concomitant substances were investigated in detail.The experimental results indicated that this method was simple, rapid, and sensitive.The linear range was 8.367×10^-4 to 2.789×10^-2 mol L^-1, the relative standard deviation (R.S.D.) was lower than 0.96%, and the spiked recoveries of aniline in environmental water samples were in the range of 99.4-106.9% under the optimal conditions.The results indicated that the present method could be used as an alternative method for aniline determination in realworld water samples.

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Novel preparation of monolithic imprinted columns for electrochromatographic separation by photopolymerization

Yu Ping Zhang, Guo Qiang Zuo, Wen Jun Gong, Yue E. Deng, Quan Ming Li

中国化学快报. 2007, 18(06): 734-737. https://doi.org/10.1016/j.cclet.2007.04.029

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A monolithic molecularly imprinted polymer with specific recognition ability for 4-hydroxybenzoic acid (4-HBA) was prepared by in situ photopolymerization, using methacrylic acid (MAA) as a functional monomer, ethylene glycol dimethacrylate (EDMA) as a cross-linking agent, toluene and isooctane as porogenic solvents and Irgacure 1800 as an initiator.Baseline separation of isomers of hydroxybenzoic acid was achieved in less than 8 min on this monolithic column using 4-HBA as template, but not on the blank polymer.Furthermore, some neutral compounds could also be baseline-separated on the imprinted polymer column in the mode of pressure-driven capillary electrochromatography.

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Phase separation of ploy(ethylene glycol)+n-butanol mixture induced by supercritical CO₂

Min Qiang Hou, Shu Guang Liang, Ji Yuan Song, Xiao Yong Li, Zhao Fu Zhang, Tao Jiang, Bu Xing Han

中国化学快报. 2007, 18(06): 738-740. https://doi.org/10.1016/j.cclet.2007.04.016

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The phase behavior of supercritical (SC) CO₂+PEG1000 (PEG with average molecular weight of 1000 g/mol)+n-butanol system was studied.It was demonstrated that SC CO₂ could induce phase separation of PEG 1000+n-butanol system under suitable conditions.This hints that SC CO₂ has potential applications in the separation of mixtures of PEG+organic compound.

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Preparation of multihollow P(St-MAA) particles by sequence soap-free/soap emulsion polymerization and followed by stepwise alkali/acid posttreatment

Rong Long Li, Cheng You Kan, Ze Ping Li, Yi Du, Yan Nan Cui

中国化学快报. 2007, 18(06): 741-743. https://doi.org/10.1016/j.cclet.2007.04.038

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The effects of ionic emulsifier, sodium dodecylbenzene sulfate (SDBS), on the formation of the multihollow structures in sub-micron sized polymer particles produced by alkali/acid posttreatment were investigated.The original latex particles with narrow size distribution were synthesized by a new sequence emulsifier-free/emulsifier emulsion copolymerization of styrene (St) and methacrylic acid (MAA).Results indicated that the pore size decreased and the pore number increased with the increase of SDBS amount, and the morphology of the posttreated latex particles was also significantly influenced by the introducing time of SDBS in the preparation of the original latex particles, and a suitable introducing time was 3 h of polymerization.

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Synthesis and characterization of biodegradable aliphatic polyesters using dibutylmagnesium as initiator

Lian Liu, Zhi Yong Wei, Min Qi

中国化学快报. 2007, 18(06): 744-746. https://doi.org/10.1016/j.cclet.2007.04.011

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Aliphatic polyesters were synthesized via the ring opening polymerization of the corresponding lactones initiated with dibutylmagnesium both in bulk and in solution.The resulting polymers were characterized by ¹H, ¹³C NMR, GPC and XRD.The results indicated that dibutylmagnesium is an effective initiator for the ring opening polymerization of lactones.

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Novel thermogelling poly(ε-caprolactone-co-lactide)-poly(ethylene glycol)-poly(ε-caprolactone-co-lactide) aqueous solutions

Zhi Qiang Jiang, Xian Mo Deng, Jian Yuan Hao

中国化学快报. 2007, 18(06): 747-749. https://doi.org/10.1016/j.cclet.2007.04.037

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The aqueous solutions of poly (ε-caprolactone-co-lactide)-poly (ethylene glycol) poly (ε-caprolactone-co-lactide) undergoing sol-gel transition as the temperature increases from 20 to 50℃ were successfully prepared.The thermogelling triblock copolymers were synthesized by subtle tuning of the chemical composition and the hydrophilicity/hydrophobicity balance.The sol-gel transition was studied focusing on structure-property relationship.The amphiphilic copolymer formed micelles in aqueous solutions.It is believed to have potential applications in drug delivery and tissue engineering.

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A natural component as initiator for photopolymerization of 1, 6-hexanedioldiacrylate

Su Qing Shi, Hong Gao, Jun Nie

中国化学快报. 2007, 18(06): 750-753. https://doi.org/10.1016/j.cclet.2007.04.018

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1, 3-Benzodioxole (BDO) as a simple model compound for the BDO derivatives from natural plant was used as coinitiator for p-chlorobenzophenone (CBP) and initiator for UV photopolymerization of 1, 6-hexanedioldiacrylate (HDDA), respectively.The results showed that, BDO was an effective coinitiator for CBP.Although BDO as initiator led to very low rate of polymerization, it was still meaningful for the photocuring field.

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One-pot synthesis and characterization of a new, branched polycarbosilane bearing allyl groups

Tian Hua Huang, Zhao Ju Yu, Xu Min He, Mu He Huang, Li Fu Chen, Hai Ping Xia, Li Tong Zhang

中国化学快报. 2007, 18(06): 754-757. https://doi.org/10.1016/j.cclet.2007.04.006

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A highly branched polycarbosilane bearing allyl groups has been prepared by a one-pot synthesis with chloromethyltrichlorosilane, chloromethylmethyldichlorosilane and allyl chloride as the starting materials.The resultant polymer, with the approximate formula[SiH_1.2(CH₃)_0.71(CH₂CH=CH₂)_0.09CH₂]_n, has been characterized by ¹H, ¹³C, and ²⁹Si NMR, GPC, TG and elemental analysis.It could be cross-linked thermally at 170℃ in the absence of oxygen.Pyrolysis of the polymer gave a ceramic with a yield of about 70%.

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Synthesis of core-shell structured polymers with inserted thioether from a multi-functional scaffold

Hong Ting Pu, Qing Zhou, De Cheng Wan

中国化学快报. 2007, 18(06): 758-761. https://doi.org/10.1016/j.cclet.2007.04.005

摘要 ( )

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The synthesis of a thioether inserted, core-shell structured polymer from the scaffold of hyperbranched polyglycerol (PG) was described.PG was first allyl functionalized, and in the presence of AIBN, the allyl groups further underwent radical addition to thiol compounds, thus thiol functional polyethylene oxide monomether (MPEO) were grafted onto PG.Similarly, 2-mercaptoethylammonium chloride was introduced onto PG via thiol addition, and the residual amino groups were further quaternized with decyl bromide, leading to an amphiphilic core-shell structure polymer.

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Synthesis of a new siloxane-containing diamine and related polyimide

Yu Shao, Yan Feng Li, Xiao Long Wang, Jin Shan Guo, Xin Zhao

中国化学快报. 2007, 18(06): 762-763. https://doi.org/10.1016/j.cclet.2007.03.009

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A novel siloxane-containing diamine, bis[4-(p-aminophenoxy) phenoxy]dimethylsilane (APPMS), was successfully synthesized in three steps using hydroquinone as starting material, which was reacted with 4, 4'-oxydiphthalic anhydride (ODPA) via a conventional two-step thermal or chemical imidization method to produce a new siloxane-containing polyimide.The resulting polyimide exhibited excellent solubility, and film-forming capability.

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A new method of immobilizing ionic liquids into layered zirconium phosphates

Hai Yan Wang, Da Xiong Han

中国化学快报. 2007, 18(06): 764-767. https://doi.org/10.1016/j.cclet.2007.04.021

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In this work, a new method of a series of ion liquids (ILs) l-alkyl-3-methylimidazolium chloride[C_nmim]Cl (n=2, 4, 6, 8) intercalation into layered zirconium phosphates was investigated.It was found that the α-ZrP-2BA (i.e.pre-intercalated BA was arranged in a bilayer mode in the galleries ofα-ZrP) was a suitable host for intercalation ILs:ILs was inserted through exchanging pre-intercalated BA.And the intercalation orientation was investigated by use of X-ray diffraction (XRD) experiments and molecular modeling calculation.

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2007年, 第18卷, 第06期　刊出日期：2007-06-20

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2007年, 第18卷, 第06期 刊出日期：2007-06-20

2007年, 第18卷, 第06期　刊出日期：2007-06-20