中国化学快报

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Synthesis of a novel multivalent galactoside with high hepatocyte targeting for gene delivery

Qing Lin Jiang, Li Hai, Lei Chen, Jiao Lu, Zhi Rong Zhang, Yong Wu

中国化学快报. 2008, 19(02): 127-129. https://doi.org/10.1016/j.cclet.2007.12.002

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A novel bifunctional glycolipid which carried a cluster of thiogalactosides as the bepatocyte targeting ligand for gene delivery was prepared.Hexa-antennary alcohol 1 was used as the core scaffold to attach a cholesterol molecule by a poly (ethylene glycol) chain, while its remaining branches were linked with five acetylgalactosides, which would be deacetylated later to produce pentaantennary galaetoside.Liposome containing the galactoside showed high affinity and transfection activity in hepatoma cells HepG2.

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Regioselective protection of 10-deacetylbaccatin Ⅲ and semi-synthesis of paclitaxel

Zhang Hu, Li Li Oua, Guo Lin Zhang, Yong Ping Yu

中国化学快报. 2008, 19(02): 130-132. https://doi.org/10.1016/j.cclet.2007.11.016

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Semi-synthesis of paclitaxel was achieved in four steps from 10-deacetylbaccatin Ⅲ (10-DAB Ⅲ).The key steps are the regioselective protection at the hydroxyl group at C-7 of 10-DAB HI, using 1, 1'-thiocarbonyldiimidazole as a selective reagent, and the deprotection of the protected paclitaxel with a mixture of p-toluenesulfonic acid and 0.1 mol/L aqueous hydrochloride.

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Intramolecular cyclization of steroidal semicarbazones to pyrazoles using Vilsmeier reagent

Mahboob Alam, M. Mushfiq

中国化学快报. 2008, 19(02): 133-136. https://doi.org/10.1016/j.cclet.2007.11.027

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The preparation of hitherto unknown steroidal heterocycles containing pyrazole fused to 6, 7-position of the steroidal nucleus is described.These heterocycles were prepared by the action of Vilsmeier reagent with steroidal semicarbazones in DMF.The slructure of the compounds has been established on the basis of their elemental analysis and spectral data.A general mechanistic scheme for these reactions is also suggested based on current and previous results.

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Synthesis and characterization of HPMA copolymer-5-FU conjugates

Fang Yuan, Fu Chen, Qing Yu Xiang, Xuan Qin, Zhi Rong Zhang, Yuan Huang

中国化学快报. 2008, 19(02): 137-140. https://doi.org/10.1016/j.cclet.2007.10.035

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N-(2-Hydroxypropyl) methacrylamide copolymer-5-fluorouracil (PHPMA-FU) conjugates were synthesized by a novel and simplified synthetic mute, and characterized by UV, FTIR and HPLC analyses.The conjugated content of 5-fluorouracil (5-FU) was 3.41±0.07 wt%.The stabilities of PHPMA-FU conjugates under different conditions were studied.The results showed that HPMA copolymer was a potential carrier for tumor-targeting delivery of 5-FU.

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Preparation and property of a novel soluble oxadiazole-containing functional polyacetylene

Hong Yao Xu, Xin Wang, Jin Cui Wu

中国化学快报. 2008, 19(02): 141-145. https://doi.org/10.1016/j.cclet.2007.11.004

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A novel high molecular weight functional polyacetylene bearing oxadiazole group as a pendant, poly{4-[2-(4-octoxyphenyl)-1, 3, 4-oxadiazolyl]-benzenyloxypropynylene}, was synthesized by[Rh (nbd) Cl]₂-Et₃N catalyst.The polymer was soluble in common organic solvents such as CHCl₃ and THE The structures and properties of monomer and polymer were characterized and evaluated with FTIR, NMR, UV, TGA, GPC, and CV, respectively.The results show that the polymer possesses high thermal stability and well electron-injection property.

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Hydrolysis of epoxides and aziridines catalyzed by polymer-supported quarternary ammonium bisulfate

Wan Xuan Zhang, Kang Ye

中国化学快报. 2008, 19(02): 146-148. https://doi.org/10.1016/j.cclet.2007.11.017

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Macroporous resin (D201)-supported quartemary ammonium bisulfate (D201-HSO₄) was prepared and effectively used in catalyzing the hydrolysis of epoxides or aziridines under mild and non-metal conditions to give the corresponding 1, 2-diols and β-amino alcohols in high yields.The catalyst was facilely prepared and recyclable.

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Synthesis and biological evaluation of nitric oxide-releasing sixalkoxyl biphenyl derivatives as anticancer agents

Xiang Wen Kong, Yi Hua Zhang, Li Dai, Hui Ji, Yi Sheng Lai, Si Xun Peng

中国化学快报. 2008, 19(02): 149-152. https://doi.org/10.1016/j.cclet.2007.11.025

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A series of novel nitric oxide-donating sixalkoxyl biphenyl derivatives (14a-1) were synthesized by coupling furoxan with alkoxyl biphenyl skeleton using amino acids as the spacers, and their cytotoxicity against HepG2 cells in vitro were evaluated by MTr method.It was found that 14c, 14d, 14f, 14i, 14j and 14k showed more potent cytotoxic activities than control 5-fluorouracil.NO release assay of target compounds indicated that the maximum amount of NO released by most active compounds 14c and 14j was about 6×10^-2μmol/L, whereas 14a and 14h with very weak activity only released NO of 1×10^-2μmol/L.

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A novel synthesis of pyrazolo[3,4-b]pyridine derivatives through multi-component reaction in ionic liquid

Xin Ying Zhang, Xiao Yan Li, Xue Sen Fan, Xia Wang, Jian Ji Wang, Gui Rong Qu

中国化学快报. 2008, 19(02): 153-156. https://doi.org/10.1016/j.cclet.2007.12.009

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An efficient and novel procedure for the preparation of pyrazolo[3, 4-b]pyridine derivatives through multi-component reaction of aldehyde, 5-amino-3-methyl-1-phenylpyrazole and malononitrile or eyanoaeetate in[bmim][BF₄] is described in this paper.Advantages of the method presented here include mild conditions, high yields together with a green nature and ease of recovery and reuse of the reaction medium.

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Synthesis of a hypocrellin B-polyamide conjugate as DNA-targeting photosensitizer

Yan Yan Liu, Sheng Qin Xia, Zhang Hua Zeng, Rui Qiao, Xue Song Wang, Bao Wen Zhang

中国化学快报. 2008, 19(02): 157-160. https://doi.org/10.1016/j.cclet.2007.11.013

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A new hypocrellin B (HB) derivative bearing a bispyrrolecarboxamide-containing side chain was synthesized, which presents improved absorptivity in phototherapeutic window than Hb and affinity feature towards dsDNA.

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Water promoted,microwave-assisted oxidative novel deamination of N-aminoquinazolinones

M. Arfan, Rasool Khan, Shazia Anjum, Shabir Ahmad, M. Iqbal Choudhary

中国化学快报. 2008, 19(02): 161-165. https://doi.org/10.1016/j.cclet.2007.10.056

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A novel deamination of 2-alkyl/aryl 3-amino-4(3H)-qninazolinones series using aqueous KMnO₄ under thermal condition and microwave irradiation is described.Compared to thermal condition, significantly higher yields in much shorter times were observedfor reactions under microwave irradiation.A plausible mechanism has been proposed for the oxidative water-promoted deamination.

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Synthesis of urea acetates as potential PPARα/γ dual agonists

Chang Yan Zhao, Chang Qing Shi, Yuan Wei Chen

中国化学快报. 2008, 19(02): 166-168. https://doi.org/10.1016/j.cclet.2007.12.013

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In the quest for novel PPARα/γ dual agonists as putative drugs for the treatment of type 2 diabetes and dyslipidemia, we designed and synthesized a series of urea acetates as potential PPARα/γ dual agonists.The structure of the target compounds, intermediates were characterized by ¹H NMR, HRMS.

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Synthesis and biological evaluation of tetrahydroisoquinoline derivatives as potential multidrug resistance reversal agents in cancer

Yu Li, Hui Bin Zhang, Wen Long Huang, Xia Zhen, Yun Man Li

中国化学快报. 2008, 19(02): 169-171. https://doi.org/10.1016/j.cclet.2007.12.016

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Tetrahydroisoquinoline derivatives were synthesized and their multidrug resistance reversal activities were evaluated in vitro.The results showed that some of the synthetic compounds had higher multidrug resistance (MDR) reversal activities than verapamil.

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A new facile synthesis of shikalkin

Qun Lu, Hao Lun Tang, Yan Qiang Shao, Jun Chao Cai

中国化学快报. 2008, 19(02): 172-174. https://doi.org/10.1016/j.cclet.2007.11.031

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A short and convergent approach for the synthesis of shikalkin (dl-shikonin) is presented.Stobbe reaction was employed to construct the aromatic skeleton 6.This is followed by a practical method to prepare the key epoxides 9 from aldehydes 8 in high yield.Finally, shikalkin is achieved by CJrignard reaction and oxidation.

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An efficient synthesis of substituted alkyl acrylates using α-keto amides

R. Baharfar, M. Tajbakhsh, A. Hamedaninejad, S. J. Hosseini

中国化学快报. 2008, 19(02): 175-179. https://doi.org/10.1016/j.cclet.2007.12.014

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The addition of α-keto amides as a NH-acid to alkyl propiolates and dialkyl acetylenedicarboxylates in the presence of a catalytic amount of triphenylphosphine gives the corresponding substituted alkyl acrylates.

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Two new compounds from the stem of Vernonia cumingiana

Mao Rong Suo, Jun Shan Yang, Ze Sheng Zhang

中国化学快报. 2008, 19(02): 180-182. https://doi.org/10.1016/j.cclet.2007.12.001

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Two new compounds vernonioside S and vernoniether S were isolated from the stem of Vernonia cumingiana, and theirstructures were elucidated on the basis of spectroscopic evidences.

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Two new limonoids from Melia toosendan

Fan Xie, Chao Feng Zhang, Mian Zhang, Zheng Tao Wang, Bo Yang Yu

中国化学快报. 2008, 19(02): 183-186. https://doi.org/10.1016/j.cclet.2007.12.004

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Two new limonoid-type triterpenoids, named 12-o-ethyl-l-deacetylnimbolinin B and 1-o-tigloyl-1-o-debenzoylohchinal, havebeen isolated from the fruit of Melia toosendan Sieb.et Zucc.Their structures were elucidated by spectral methods, including 2D-NMR spectra.

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Two new antitumor diterpenes from Pinus sylvestris

Qiang Wang, Zhang Rong, Jie Teng, Yoshihisa Takaishi, Hong Quan Duan

中国化学快报. 2008, 19(02): 187-189. https://doi.org/10.1016/j.cclet.2007.11.028

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Two new diterpenes, 15-ethyl-18-methyl pinifolate (1) and 18-hydroxy-labda-8(17), 13E-dien-15-acetate (2), were isolated from the needles of Pinus sylvestris.Their structures were elucidated by spectroscopic methods, including 2D-NMR spectra.Compound 1 exhibited the significant eytotoxic activity against the human carcinoma cell lines Hela, SK-N-SH and BEL-7402 in vitro.

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Antitumor triterpene saponins from Anemone flaccida

Lan Tian Zhang, Yan Wen Zhang, Yoshihisa Takaishi, Hong Quan Duan

中国化学快报. 2008, 19(02): 190-192. https://doi.org/10.1016/j.cclet.2007.11.029

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A new triterpenoid saponin, 3-O-[(6'-butyryl)-β-D-glucopyranosyl]-28-O-[α-L-thamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl] oleanolic acid, as well as three known triterpenoid saponins were isolated from the rhizomes of Anemone flaccida.Their structures were elucidated by spectroscopic methods.These compounds showed significant antitumor activities.

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A new cyclopeptide from Dianthus caryophyllus

Fei Li, Feng Mei Zhang, Ya Bin Yang, Xue Qiong Yang, Qiu E. Cao, Zhong Tao Ding

中国化学快报. 2008, 19(02): 193-195. https://doi.org/10.1016/j.cclet.2007.12.010

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A new cyclopeptide as well as a known cyclopeptide were isolated from the whole plants of Dianthus caryophyllus.Their structures were elucidated as cyclo (-Thr-Gly-Pro-Tyr-Pbe-)(1) and cyclo (-Ala-Gly-Ser-IIe-Phe-Phe-)(2) by means of chemical and spectroscopic methods including MS, ID and 2D NMR techniques.

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A new benzofuranolignan and a new flavonol derivative from the stem of Morus australis

Qing Jian Zhang, Di Zao Li, Ruo Yun Chen, De Quan Yu

中国化学快报. 2008, 19(02): 196-198. https://doi.org/10.1016/j.cclet.2007.12.011

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A new benzofuranolignan austrafuran A (1) and a new flavonol derivative 5, 7, 2', 4'-tetrahydroxy-3-methoxyflavone (2) were isolated from the stem of Morus australis.Their structures were determined on the basis of spectroscopic evidences.

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Charge transfer on porous silicon membranes studied by current-sensing atomic force microscopy

Bing Xia, Qiang Miao, Jie Chao, Shou Jun Xiao, Hai Tao Wang, Zhong Dang Xiao

中国化学快报. 2008, 19(02): 199-202. https://doi.org/10.1016/j.cclet.2007.12.003

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A visible rectification effect on the current-voltage curves of metal/porous silicon/p-silicon has been observed by currentsensing atomic force microscopy.The current-voltage curves of porous silicon membranes with different porosities, prepared through variation of etching current density for a constant time, indicate that a higher porosity results in a higher resistance and thus a lower rectification, until the current reaches a threshold at a porosity > 55%.We propose that the conductance mode in the porous silicon membrane with porosities > 55% is mainly a hopping mechanism between nano-crystallites and an inverse static electric field between the porous silicon and p-Si interface blocks the electron injection from porous silicon to p-Si, but with porosities ≤ 55%, electron flows through a direct continuous channel between nano-crystallites.

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Flow-injection chemiluminescence determination of tryptophan using galangin-potassium permanganate-polyphosphoric acid system

Hui Chen, Li Li, Min Zhou, Yong Jun Ma

中国化学快报. 2008, 19(02): 203-206. https://doi.org/10.1016/j.cclet.2007.10.050

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A high sensitive flow-injection chemiluminescence (FI-CL) method for the determination of tryptephan has been developed.The method is based on the chemiluminescence reaction of galangin-potassium perrnanganate-tryptophan in polyphosphoric acid (PPA) media.Under the optimized conditions, tryptophan was determined in the range 0.05-10 μg/mL with the detection limit (3σ) of 5.0×10^-3 μg/mL.The relative standard deviation (RSD) was 1.0% for 11 replicate determinations of 1.0 μg/mL tryptophan.Three synthetic samples were determined selectively with recoveries in the range from 99.6% to 102.0% in the presence of other amino acids.

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Flexible organic photovoltaic devices based on oligothiophene derivatives

Ping Liu, Tu Hua Chen, Wan Zhang Pan, Ming Sheng Huang, Wen Ji Deng, Yu Liang Mai, An Bo Luan

中国化学快报. 2008, 19(02): 207-210. https://doi.org/10.1016/j.cclet.2007.12.006

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For the purpose of developing flexible organic photovoltaic devices, we have fabricated two flexible devices using 5-formyl-2, 2':5', 2":5", 2"'-quaterthiophene (4T-CHO), 5-formyl-2, 2':5', 2":5", 2'":5"', 2"''-quinquethiophene (5T-CHO) and 3, 4, 9, 10-peryle-netertracarboxylic dianhydride (PTCDA).The PET-ITO/4T-CHO/PTCDA/AI device has an open circuit voltage (V∝) of 1.56 V, photoelectric conversion efficiency of 0.77%.The PET-ITO/ST-CHO/PTCDA/AI device has a V_∝ of 1.70 V, photoelectric conversion efficiency of 0.84%.The two flexible devices have high V_∝(1.56 and 1.70 V).It is possible that intermolecular hydrogen bonding between-CHO group of nT-CHO and carboxylic dianhydride of PTCDA contributes to enhancing the efficiency by promoting interfacial electron transfer and eliminating the subconducting band trap sites.

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Toxicity assessment of heavy metals and organic compounds using CellSense biosensor with E.coli

Hong Wang, Xue Jiang Wang, Jian Fu Zhao, Ling Chen

中国化学快报. 2008, 19(02): 211-214. https://doi.org/10.1016/j.cclet.2007.10.053

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A new strategy using an amperometric biosensor with Escherichia coli(E.coli) that provides a rapid toxicity determination of chemical compounds is described.The CellSense biosensor system comprises a biological component immobilized in intimate contact with a transducer which converts the biochemical signal into a quantifiable electrical signal.Toxicity assessment of heavy metals using E.coli biosensors could be finished within 30 min and the 50% effective concentrations (EC₅₀) values of four heavy metals were determined.The results shows that inhibitory effects of four heavy metals to E.coli can be ranked in a decreasing order of Hg²⁺ > Cu²⁺ > Zn²⁺ > Ni²⁺, which accords to the results of conventional bacterial counting method.The toxicity test of organic compounds by using CellSense biosensor was also demonstrated.The CellSense biosensor with E.coli shows a good, reproducible behavior and can be used for reproducible measurements.

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Novel β-cyclodextrin modified quantum dots as fluorescent probes for polycyclic aromatic hydrocarbons (PAHs)

Cui Ping Han, Hai Bing Li

中国化学快报. 2008, 19(02): 215-218. https://doi.org/10.1016/j.cclet.2007.11.008

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Water-soluble CdSe/ZnS quantum dots (QDs) were prepared via a simple sonochemical procedure using β-cyclodextrin (CD) as surface coating agent.The QDs displayed a sensitive emission enhancement for anthracene over other related polycyclic aromatic hydrocarbons, and the detection limit was around 1.6×10^-8 mol/L.

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Determination of petroleum sulfonates in crude oil by column-switching anion-exchange chromatography

Liang Zhao, Xu Long Cao, Hong Yan Wang, Xia Liu, Sheng Xiang Jiang

中国化学快报. 2008, 19(02): 219-222. https://doi.org/10.1016/j.cclet.2007.12.015

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A column-switching anion-exchange chromatography method was described for the separation and determination of petroleum monosulfonates (PMS) and petroleum disulfonates (PDS) in crude oil that was simply diluted with the dichloromethane/methanol (60/40).The high performance liquid chromatography (HPLC) system consisted of a clean-up column and an analytical column, which were connected with two six-port switching valves.Detection of petroleum sulfonates was available and repeatable.This method has been successfully applied to determine PMS and PDS in crude oil samples from Shengli oil field.

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Polyaniline nanobelts,flower-like and rhizoid-like nanostructures by electrospinning

Qiao Zhen Yu, Ying Li, Mang Wang, Hong Zheng Chen

中国化学快报. 2008, 19(02): 223-226. https://doi.org/10.1016/j.cclet.2007.12.005

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Nanobelts, flower-like and rhizoid-like nanostructures of pure polyaniline (PANI) doped with sulfuric acid or hydrochloric acid were prepared via electrospinning by using a coagulation bath as the collector after optimizing the fabrication parameters.The morphologies of these nanostructures were characterized by scanning electron microscope (SEM).The possible formation mechanisms were discussed.

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Synthesis and characterization of novel poly(aryl ether sulfone ketone)s containing phthalazinone and biphenyl moieties

Li Hong Xiao, Cheng Liu, Xi Gao Jian

中国化学快报. 2008, 19(02): 227-229. https://doi.org/10.1016/j.cclet.2007.11.005

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A novel series of poly (aryl ether sulfone ketone) s (PPESKs) containing phthalazinone and biphenyl moieties were prepared by two-step nucleophilic polycondensation reaction.The (M)_w values of these copolymers were between 38, 330 and 67, 900.The glass transition temperatures (T_g) and 5% decomposition temperatures were ranged in 253-269℃ and 488-500℃, respectively, The structures of these copolymers were confirmed by FT-IR and ¹H NMR.Moreover, all the resultant copolymers were amorphous determined by wide angle X-ray diffraction (WAXD).

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Synthesis and characterization of poly(phthalazinone ether nitrile)(PPEN)-polydimethylsiloxane (PDMS)block copolymers

Li Ming Dong, Gong Xiong Liao, Ming Jing Wang, Xi Gao Jian

中国化学快报. 2008, 19(02): 230-232. https://doi.org/10.1016/j.cclet.2007.11.006

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Block copolymers with different backbone compositions have been prepared by the condensation of dimethylamino terminated poly (dimethylsiloxane)(PDMS) and hydroquinone terminated poly (phthalazinone ether nitrile)(PPEN) in the presence of chlorobenzene/N-methyl pyrrolidone (NMP) as solvents.The products were characterized by FTIR, ¹H NMR and gel permeation chromatography.Differential scanning calorimetry analysis indicated that the block copolymers showed separated microphase.

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Hemoglobin-imprinted polymer gel prepared using modified glucosamine as functional monomer

Hai Li Zhao, Tian Ying Guo, Yong Qing Xia, Mou Dao Song

中国化学快报. 2008, 19(02): 233-236. https://doi.org/10.1016/j.cclet.2007.10.045

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A new functional glycomonomer was obtained from modified glucosamine.Hemoglobin-imprinted polymer gel was prepared with allyl-bromide modified glucosamine as functional monomer, poly (ethylene-glycol) diaorylate (PEGDA) as cross-linker and ammonium persulfate[(NH₄)₂S₂O₈]/sodium hydrogen sulfite (NaHSO₃) as initiators in a phosphate buffer.The adsorption capacity and selective adsorption of the molecular imprinting polymer (MIP) were also discussed.

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Synthesis and characterization of H-type amphiphilic liquid crystalline block copolymers by ATRP

Xin De Tang, Long Cheng Gao, Xing He Fan, Qi Feng Zhou

中国化学快报. 2008, 19(02): 237-240. https://doi.org/10.1016/j.cclet.2007.11.024

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H-type amphiphilic liquid crystalline block copolymers containing azobenzene were synthesized by atom transfer radical polymerization (ATRP).Macroinitiators prepared by the esteriflcation between poly (ethylene oxide)(PEG) and 2, 2-dichloroacetyl chloride were utilized to initiate the polymerization of 6-[4-(4-ethoxyphenylazo) phenoxy]hexyl methacrylate (M6C).The resulting macroinitiators and block copolymers were characterized by ¹H NMR, gel permeation chromatography (GPC).Polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) preliminarily revealed the liquid crystalline property of these block copolymers.This series of liquid crystalline block copolymers are promising in some areas, such as optical data storage, optical switch, and molecular devices.

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Flame retardant polyamide 6 by in situ polymerization of ε-caprolactam in the presence of melamine derivatives

Zhi Yong Wu, Wei Xu, Jin Kui Xia, Yao Chi Liu, Qian Xin Wu, Wei Jian Xu

中国化学快报. 2008, 19(02): 241-244. https://doi.org/10.1016/j.cclet.2007.12.012

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An improved method for preparing melamine cyanurate (MCA) based flame retardant polyamide 6 (FRPA6) materials has been proposed.This processing method, i.e., improved in situ polymerization, was used to synthesize flame retardant PA6.In situ formed MCA nanoparticles were supposed to be linked to PA6 chains in the ε-caprolactam hydrolytic polymerization system to obtain startype polymers for the first time.Through TEM photographs, it can be found that the in situ formed MCA nanoparticles with diametric size of less than 50 nm, are nanoscaled, highly uniformly dispersed in the PA6 matrix.Synthesized flame retardant PA6 have good fire performance which can achieve UL-94 V-0 rating at 1.6 mm thickness with the presence of 7.34 wt.% MCA in the matrix.

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Oxidation of glyoxal to glyoxylic acid by oxygen over V₂O₅/C catalyst

Yu Lan Niu, Zheng Xu, Min Li, Rui Feng Li

中国化学快报. 2008, 19(02): 245-248. https://doi.org/10.1016/j.cclet.2007.11.015

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A novel vanadium oxide catalyst supported on active carbon was prepared by an incipient wetness impregnation method, and the precursor was obtained from oxalic acid aqueous solutions of NH₄VO₃.The catalyst was applied liquid phase oxidation of glyoxal to glyoxylic acid.It was found that V₂O₅/C catalyst exhibited obvious activity for glyoxal oxidation.Glyoxylic acid could be obtained without pH regulation during the reaction.By using this catalyst, the conversion of glyoxal and the yield of glyoxalic acid were 29.2% and 13.6%, respectively at 313 K and oxygen flow 0.1 L/min after reaction for 10h.

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Critical temperatures and pressures of reacting mixture in synthesis of dimethyl carbonate with methanol and carbon dioxide

Xing Cui Guo, Zhang Feng Qin, Guo Fu Wang, Jian Guo Wang

中国化学快报. 2008, 19(02): 249-252. https://doi.org/10.1016/j.cclet.2007.12.007

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Critical temperatures and pressures of nominal reacting mixture in synthesis of dimethyl carbonate (DMC) from methanol and carbon dioxide (quaternary mixture of carbon dioxide+methanol+water+DMC) were measured using a high-pressure view cell.The results suggested that the critical properties of the reacting mixture depended on the reaction extent as well as its initial composition (initial ratio of carbon dioxide to methanol).Such information is essential for determining the reaction conditions when one intends to carry out the synthesis of DMC with CO₂ and methanol under supercritical conditions.

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2008年, 第19卷, 第02期　刊出日期：2008-02-20

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2008年, 第19卷, 第02期 刊出日期：2008-02-20

2008年, 第19卷, 第02期　刊出日期：2008-02-20