中国化学快报

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Total Synthesis of Two 4, 5-Dioxo-seco-eudesmane Sesquiterpenes

Li Jing FANG, Chen Xi ZHANG, Jin Chun CHEN, Guo Jun ZHENG, Yu Lin LI

中国化学快报. 2005, 16(05): 569-571.

摘要 ( )

可视化

A facile synthetic route to two seco-eudesmane, 4, 5-dioxo-10-epi-4, 5-seco-γeudesmane (1) and 4, 5-dioxo-10-epi-4, 5-seco-γ-eudesmol (2) from (+)-dihydrocarvone has been described. Avoiding expensive reagents, this highly economic method especially suits for the synthesis of 4, 5-seco-eudesman-type and ophianon-type sesquiterpenes with a double bond at position 11 and 12.

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Preparation and Cytotoxicity of Novel Aliphatic Polycarbonate Synthesized from Dihydroxyacetone

Lian Sheng WANG, Xue Song JIANG, Hao WANG, Si Xue CHENG, Ren Xi ZHUO

中国化学快报. 2005, 16(05): 572-574.

摘要 ( )

可视化

A new cyclic carbonate, 2,2-ethylenedioxypropane-1,3-diol carbonate (EOPDC), was synthesized through a two-step reaction from dihydroxyacetone dimer, and polymerized in bulk initiated by Sn(Oct)₂ to give a high molecular weight polycarbonate. The structure of monomer and the polymer were characterized by FT-IR, ¹H NMR, ¹³C NMR. The cytotoxicity of the obtained polycarbonate was investigated by MTT assay.

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Photochemically Catalyzed Diels-Alder Reaction of Azadienes with 2,3-Dihydrofuran by 2, 4, 6-Triphenylpyrylium Salt:Synthesis of Styrylfuroquinoline Derivatives

Wei ZHANG, Yan Ping GUO, Li YANG, Zhong Li LIU

中国化学快报. 2005, 16(05): 575-578.

摘要 ( )

可视化

Photochemically promoted Diels-Alder reactions of 1, 4-diaryl-1-azabutadienes with2,3-dihydrofuran were achieved by using 2, 4, 6-triphenylpyrylium tetrafluoroborate as catalyst to produce corresponding styrylfuroquinolines in high yield.

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Radical-controlled Oscillations in BrO₃^--fructose-Mn²⁺-H₂SO₄ System

He Xing LI, Chun Hua GE

中国化学快报. 2005, 16(05): 579-582.

摘要 ( )

可视化

Sustained oscillations were observed in the BrO₃^--fructose-Mn²⁺-H₂SO₄ system.Unlike the classical BZ oscillations, the present oscillations might be considered as radicalcontrolled rather than bromide-controlled since no substance subjected to bromination was present.Addition of acetone induced dual-frequency oscillations comprised of both the radical-controlled and the bromide-controlled oscillations.

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Solid-phase Synthesis of Vinyl Sulfones Using Polystyrene-supported Selenomethyl Phenyl Sulfone

Shou Ri SHENG, Wei ZHOU, Xiao Ling LIU, Qin XIN, Cai Sheng SONG

中国化学快报. 2005, 16(05): 583-584.

摘要 ( )

可视化

The solid-phase preparation of vinyl sulfones via a novel polystyrene-supported selenomethyl phenyl sulfone reagent has been reported.

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Solid-phase Synthesis of PNA Monomer by Ugi Four-component Condensation Reaction

Wen Hao WANG, Xiao Min ZOU, Xin ZHANG, Yi Qiu FU, Ping XU

中国化学快报. 2005, 16(05): 585-588.

摘要 ( )

可视化

Peptide nucleic acids (PNA) oligomers were synthesized in most cases by peptide synthesis from N-protected monomers. In this work a new method of obtaining PNA monomer by Ugi four-component condensation reaction was tested by solid-phase synthesis. The Fmoc protected PNA monomer was build up with thymin-1-yl acetic acid, 3-methylbutyl aldehyde, Fmoc protected aminoethyl isocyanide and Gly-Wang resin.

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Regioselective 1,2-Addition of Ti(Ⅳ)-enolate to α, β-Unsaturated Compounds

Gui Sheng DENG, Ming Yi LIAO, Xue TIAN, Jian Bo WANG

中国化学快报. 2005, 16(05): 589-592.

摘要 ( )

可视化

The nucleophilic addition of Ti(Ⅳ) enolate derived from methyl aryl ketones to α, β-unsaturated compounds was found to be highly selective to give 1, 2 addition products.

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An Efficient Way for Glycosylation of Spirostanol

Shu Jie HOU, Chuan Chun ZOU, Ping Sheng LEI, De Quan YU

中国化学快报. 2005, 16(05): 593-596.

摘要 ( )

可视化

Using thioglycosides as donors, trimethylsilyl trifluoromethanesulfonate (TMSOTf) and N-iodosuccinimide(NIS) as promoter, a modified procedure for the glycosylation of spirostanol was developed. A series of saponins were synthesized in mild condition with excellent yields.

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Synthesis and Nonlinear Optical Properties of New Quadrupolar Chromophores

Xiao Zhi GUO, Xiao Mei WANG, Yu Kou DU, Nan Ping HUA, Ming SHEN, Wan Li JIANG, Ping YANG

中国化学快报. 2005, 16(05): 597-600.

摘要 ( )

可视化

Two new symmetric chromophores:2, 8-bis-[(2-4'-ethoxy phenyl-5-4'-styryl)-1, 3, 4-oxadiazole] didibenzothiophene (abbreviated as SO-G₁) and 2, 8-bis-[(2-4'-ethoxy phenyl-5-4'-styryl)-1, 3, 4-oxadiazole]-N-ethyl carbazole (abbreviated as NO-G₁) have been synthesized and characterized. Both chromophores exhibit strong two-photon absorption (TPA) with the cross-sections of 2.99×10^-48 and 3.48×10^-48 cm⁴·s·photon^-1 in THF and large up-conversion emission, when pumped by Ti:sapphire femto-second laser at 720 nm.

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β-Lactam Templated Macrocyclization:Synthesis of 12-Membered Macrolide

Guo Juan LIANG, Jin Zhong ZHANG, An Qi CHEN

中国化学快报. 2005, 16(05): 601-603.

摘要 ( )

可视化

A novel macrolactonization method was developed using a chiral β-lactam as the template. This novel method features that the macrocyclization is simultaneously achieved while a TBS protected hydroxy group is deprotected.

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Synthesis of 24-Methylene-cholest-5-ene-7-oxo-3β,19-diacetate

Wei Gang LU, Cui Xian ZHANG, Jing Yu SU, Long Mei ZENG

中国化学快报. 2005, 16(05): 604-606.

摘要 ( )

可视化

24-Methylenecholest-5-ene-7-oxo-3β,19-diacetate 5 was synthesized starting from stigmasterol via twelve step reactions in 4.1% overall yield. It can be served as a key intermediate for the synthesis of 24-methylenecholest-5-ene-3β,7β,19-triol 1, a naturally occuring polyhydroxylated sterol with potential biological activity.

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A Rapid and Efficient Synthesis of 2, 4, 6-Triarylpyridines under Microwave Irradiation

Xian Qiang HUANG, Hong Xia LI, Jin Xian WANG, Xue Feng JIA

中国化学快报. 2005, 16(05): 607-608.

摘要 ( )

可视化

An rapid and efficient synthesis of 2, 4, 6-triarylpyridines is reported using substituted benzaldehydes, substituted acetophenones and ammonia as starting materials under microwave irradiation in the presence of PEG-400.

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Synthesis and Characterization of Novel Multifunctional Acylthiourea Polymers

Xue Pu MAO, Jin Feng HUANG, Zhi Fang DUAN, Zhi Yun DU, Zhi Shu HUANG, Lin MA, Lian Quan GU

中国化学快报. 2005, 16(05): 609-612.

摘要 ( )

可视化

Several thiourea polymers have been synthesized through the reaction of diamine with 1,4- or 1, 3- benzenedicarbonyl chloride and ammonium thiocyanate by solid-liquid phase transfer catalysis of polyethylene glycol-400 (PEG-400). The polymers were characterized and identified by elemental analysis, IR, ¹HNMR and GPC. The multifunctional polymers have potential value as an ideal support for immobilized enzymes.

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A New Compound Isolated from a Bioactive Streptomycete

Yi Qing LI, Xue Shi HUANG, Ming Gang LI, Isabel SATTLER, Meng Liang WEN, Susanne GRABLEY

中国化学快报. 2005, 16(05): 613-615.

摘要 ( )

可视化

A new compound, named (S)-α-acetylamino-β-(3-indole)propanol (1) was isolated, along with two known compounds teleocidin B1 and emycin B from culture broth of a streptomycete strain YIM33176 (streptomyces pleomorphus). The structure of 1 was determined by detailed spectroscopic investigation.

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A Novel Triterpenoid from Petasites tricholobus

Wei Dong XIE, Ping Lin LI, Zhong Jian JIA

中国化学快报. 2005, 16(05): 616-618.

摘要 ( )

可视化

A novel triterpenoid, D:B-friedoursane-3α, 16α-dihydroxy-7α, 8α-epoxy-5(10)-ene,named petatrichol A, was isolated from the roots of Petasites tricholobus Franch.. Its structure was elucidated by spectroscopic methods, especially 2DNMR techniques.

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A New Asterosaponin from the Starfish Culcita novaeguineae

Hai Feng TANG, Yang Hua YI, Ling LI, Peng SUN, Da Zheng ZHOU, Bao Shu LIU

中国化学快报. 2005, 16(05): 619-622.

摘要 ( )

可视化

A new asterosaponin named novaeguinoside A, along with a known saponin, asteronyl pentaglycoside sulfate, was isolated from the starfish Culcita novaeguineae. The new compound was identified to be sodium 6α-O-{β-D-fucopyranosyl-(1→2)-β-D-fucopyranosyl-(1→4)-[β-Dquinovopyranosy1-(1→2)]-β-D-xylopyranosy1-(1→3)-β-D-quinovopyranosy1}-5α-pregn-9(11)-en-20-one-3β-yl-sulfate by extensive spectral analysis and chemical evidence.

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Two New Xanthones from Polygala crotalarioides

Shi Ming DENG, You Xing ZHAO, Yu Qing LIU, Jun ZHOU

中国化学快报. 2005, 16(05): 623-624.

摘要 ( )

可视化

Two new xanthones, 1, 6, 8-trihydroxy-2, 3-methylenedioxyxanthone 1 and 1, 4-dihydroxy-6, 7-methylenedioxyxanthone 2, were isolated from the roots of Polygala crotalarioides.Their structures were elucidated by spectroscopic and chemical methods.

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Two New ent-Kaurenoids from Cacalia pilgeriana

Er Wei LI, Kun GAO, Zhong Jian JIA, Xin ZHAO

中国化学快报. 2005, 16(05): 625-626.

摘要 ( )

可视化

Two new ent-kaurenoids, 19-acetyl-ent-3β, 17-dihydroxykaur-15-ene(1), 19-acetyl-ent-3β-hydroxykaur-15-en-17-al (2) were isolated from Cacalia pilgeriana. Their structures were elucidated by spectroscopic methods.

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Analysis of Toxin β-N-Oxalyl-α,β-diaminopropionic Acid (β-ODAP),its Isomer α-ODAP and Other Free Amino Acids in Lathyrus sativus

Ze Yi YAN, Cheng Jin JIAO, Fen Min LI, Yong Min LIANG, Zhi Xiao LI

中国化学快报. 2005, 16(05): 627-630.

摘要 ( )

可视化

A method has been presented for the simultaneous analysis of neurotoxin β-N-oxalyl-α,β-diaminopropionic acid (β-ODAP) and its non-or low-toxic isomer α-ODAP as well as other amino acids in Lathyrus sativus extracts after derivatization with para-nitrobenzyloxycarbonyl chloride (PNZ-C1) by reversed-phase (C₁₈ column) high performance liquid chromatography(RP-HPLC). Detection limits of isomers were 0.08 μg/mL for both β-, α-ODAP, for homoarginine 0.09 μg/mL at a signal-to-noise ratio of 3:1.

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Photo-and Electro-luminescence of the New Ternary Europium(Ⅲ) Complex

Chen Xia DU, Zhi Qiang WANG, Qi XIN, Yang Jie WU, Wen Lian LI

中国化学快报. 2005, 16(05): 631-634.

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可视化

A new luminescent europium complex[Eu(DBM)₃dpq] (DBM=1, 3-diphenyl-1, 3-propanedionate and dpq=dipyrido[2,3-f] [2',3'-h]quinoxaline) has been synthesized and shows intense red emission under UV excitation. With the device structure ITO/TPD/Eu(DBM)₃dpq:TPD (1:2)/Gd(DBM)₃bath/Mg:Ag, sharp-band red emissions with low turn-on voltage of 3V and high brightness of 304cd m^-2 were achieved.

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Preparation of the Ag₂O₂-PbO₂ Modified Electrode and Its Application towards Escherichia coli Fast Counting in Water

Jing GU, Wen ZHANG, Yu Feng YANG, Lei ZHENG, Zi Rong WU, Li Tong JIN

中国化学快报. 2005, 16(05): 635-638.

摘要 ( )

可视化

A novel nano crystalline Ag₂O₂-PbO₂film chemically modified electrode (CME) was prepared and the CME was characterized by X-ray diffractometer (XRD) and atomic force microscope (AFM). By chronoamperometry, the nano Ag₂O₂-PbO₂ CME was used as bioelectrochemical sensor to determine the population of Escherichia coli (E. coli) in water. Compared with conventional methods, it is found that the technique we used is fast and convenient in counting E.coli.

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HPLC Determination of the Major Non-protein Amino Acids and Common Biogenic Amines in Lathyrus sativus Using a Novel Extraction Method

Ze Yi YAN, Cheng Jin JIAO, Feng Min LI, Yong Min LIANG, Zhi Xiao LI

中国化学快报. 2005, 16(05): 639-642.

摘要 ( )

可视化

An assay is presented for simultaneously determining 5 biogenic amines and the major non-protein amino acids:the toxin β-N-oxalyl-L-α,β-diaminopropanoic acid (β-ODAP), its isomer α-ODAP and homoarginine in Lathyrus sativus extracts using the HPLC system after derivatization with para-nitrobenzyloxycarbonyl chloride (PNZ-C1). However, it is more worthy of noting that this paper also describes a new extraction method using 0.2 mol/L HC1O₄. The new method has some advantages:shorter extraction-time, simultaneous extraction of free amino acids and polyamines, better inhibiting the isomerization of β-ODAP to α-ODAP, and so on.

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ESI/MS of N-(O, O-Diisopropyl) Phosphoryl Aromatic Amino Acids and their Stability Investigation Using HPLC/UV/ESI/MS

Hong Xia LIU, Shu Sheng ZHANG, Jian Chen ZHANG, Xiao YANG, Ling Bo QU, Yu Fen ZHAO

中国化学快报. 2005, 16(05): 643-646.

摘要 ( )

可视化

The full scan ESI/MS and ESI/MS² of N-(O, O-diisopropyl) phosphoryl aromatic amino acids (DIPPAAAs), N-(O, O-diisopropyl) phosphoryl phenylalanine, N-(O, O-diisopropyl)phosphoryl tryptophan and N-(O, O-diisopropyl) phosphoryl tyrosine, were obtained. The specific ions for them were found. Their stability in the LC mobile phase was investigated using developed HPLC/UV/ESI/MS and the results demonstrated that the DIPPAAAs were stable in the mobile phase (5 mmol/L NH₄Ac-MeCN (80:20,v/v, pH7.5) within 48 h.

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Capillary Zone Electrophoresis Investigation of Interactions between Granulocyte-colony Stimulating Factor and Dextran Sulfate/Carrageenan Oligosaccharide

Ai Ye LIANG, Yu Guang DU, Ke Yi WANG, Bing Cheng LIN

中国化学快报. 2005, 16(05): 647-650.

摘要 ( )

可视化

The interactions between granulocyte-colony stimulating factor (G-CSF) and dextran sulfate/κ-carrageenan oligosa1ccharide were studied by capillary zone electrophoresis. Dextran sulfate could strongly interact with G-CSF and the complex was detected. The binding constant and stoichiometry were determined to be 1.2×10⁶ (mol/L)^-1 and 3:1, respectively. However, the interaction between κ-carrageenan oligosaccharide and G-CSF was not found.

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Endonuclease-based Method for Detecting the Sequence Specific DNA Binding Protein on Double-stranded DNA Microarray

Yun Fei BAI, Qin Yu GE, Tong Xiang LI, Jin Ke WANG, Quan Jun LIU, Zu Hong LU

中国化学快报. 2005, 16(05): 651-654.

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可视化

The double-stranded DNA (dsDNA) probe contains two different protein binding sites.One is for DNA-binding proteins to be detected and the other is for a DNA restriction enzyme.The two sites were arranged together with no base interval. The working principle of the capturing dsDNA probe is described as follows:the capturing probe can be cut with the DNA restriction enzyme (such as EcoR I) to cause a sticky terminal, if the probe is not bound with a target protein, and the sticky terminal can be extended and labeled with Cy3-dUTP by DNA polymerase. When the probe is bound with a target protein, the probe is not capable to be cut by the restriction enzyme because of space obstruction. The amount of the target DNA binding proteins can be measured according to the variations of fluorescent signals of the corresponding probes.

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Thin-layer Spectroelectrochemistry of 3, 3',5, 5'-Tetramethyl-benzidine on Pt Minigrid Optically Transparent Electrode

Kui JIAO, Tao YAN G, Zeng Jian WANG

中国化学快报. 2005, 16(05): 655-658.

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可视化

The electrooxidation behavior of 3, 3' 5, 5'-tetramethylbenzidine(TMB) was investigated using a platinum minigrid optically transparent thin-layer spectroelectrochemical cell. TMB underwent one two-electron electrooxidation process to yield quinonediimine in the pH range from 2.0 to < 4.0, and two consecutive one-electron electrooxidation processes, gave the mediate product free radical of TMB first, then gave the oxidation product quinonediimine in the pH range from 4.0 to < 7.0. In the pH range from 7.0 to 10.0, the electrooxidation of TMB was also one two-electron electrooxidation process to yield an azo compound. The formal potential E^0' and the electron transfer number of the electrooxidation of TMB at pH 2.0 and pH 8.4 were determined by spectroelectrochemical techniques.

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Flash Evaporation and Headspace Solid-phase Microextraction for the Analysis of the Essential Oils in Traditional Chinese Medicine, Houttuynia Cordata Thunb

Min Min LIANG, Mei Ling QI, Ruo Nong FU

中国化学快报. 2005, 16(05): 659-662.

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可视化

We have investigated the use of flash evaporation, headspace solid-phase microextraction (HS-SPME) and steam distillation (SD) as sample concentration and preparation techniques for the analysis of volatile constituents present in Houttuynia cordata Thunb. The samples were analyzed by gas chromatography (GC) and identified by mass spectrometry (MS).Comparison studies were performed. It was found that the results obtained between Headspace solid-phase microextraction HS-SPME and SD techniques were in good agreement. Seventy-nine compounds in Houttuynia cordata Thunb were identified by MS. In flash evaporation, thirty-nine compounds were identified. Discrimination in the response for many constituents studied was not observed, which can be clearly observed in SD and HS-SPME techniques. As a conclusion,HS-SPME is a powerful tool for determining the volatile constitutes present in the Houttuynia cordata.

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Assembly of Ag(Ⅰ) Polymers with Thioether-S Binding and Homochiral Helices

Yong Qing HUANG, Hui ZHANG, Jian Gu CHEN, Zan Bin WEI, Jing Xing GAO

中国化学快报. 2005, 16(05): 663-666.

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可视化

A novel coordination polymer[Ag(pyta)]_n (pyta^-=4-pyridylthioacetate) containing bound thioether sulfurs and single-stranded helical chains has been synthesized and structurally characterized.

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Homogeneous Photodegradation of PVC by Tungstophosphoric Acid

Kai Hua ZHANG, Jing Chang ZHANG, Wei Liang CAO

中国化学快报. 2005, 16(05): 667-670.

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可视化

The photocatalytic degradation of polyvinyl chloride (PVC) films by tungstophosphoric acid (HPW) was investigated. The main reason for highly enhanced photodegradation of HPW-doped PVC film was studied and discussed.

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Synthesis and Application of a Novel Organosilane Modifier for Surface Paintability of Organosiloxane Sealants

Wen Fei WANG, Qiang ZHENG, Hong Guo HU, Wei Wei LIN

中国化学快报. 2005, 16(05): 671-674.

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可视化

A novel organosilane, N-n-butyl-γ-aminopropylmethyldimethoxysilane was synthesized through aminization reaction and the chemical structure of resulting products was characterized by ¹HNMR, ¹³CNMR, FT-IR and elemental analysis. The results of test on probation for this organosilane proved that it was effective to modify surface-paintability of organosiloxane sealants.

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Synthesis and Swelling Properties of Thermosensitive Hydrogels based on Terpolymerization

Cai Hua NI, Xian Yu ZENG, He HUANG

中国化学快报. 2005, 16(05): 675-676.

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可视化

Novel thermosensitive hydrogels based on polymerization of N-isopropyl acrylamide,Sodium acrylate, and diacetone acrylamide were synthesized. The swelling ratio and dynamic swelling were investigated. The results indicated that the hydrogels exhibited high water uptake and themosensitivity. The swelling properties and volume phase transition temperature could be adjusted by contents of the comonomers in the gels.

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Studies of a Series of Novel Rhenium(Ⅰ) Bipyridyl Dyes for Solar Cells

Shi Guo SUN, Xiao Jun PENG, Yong Qian XU, Lei SHI, Yun Ling GAO, Li Cheng SUN

中国化学快报. 2005, 16(05): 677-680.

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可视化

A series of novel rhenium(Ⅰ) 2,2'-bipyridyl complexes[fac-Re(4,4'-di-COOEt-bpy)-(CO)₃(Xpy)PF₆], where bpy is 2,2'-bipyridine, py is pyridine and X is 3-methyl, 3-hydroxy, or3-amino, were synthesized, their photophysical and electrochemical properties were studied. The Re(Ⅱ/Ⅰ) oxidation potentials decreased as the X group becomes more electron donating from H to3-methyl, 3-hydroxy, or 3-amino, which might be a very convenient ways for adjusting the electron transfer driving force.

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Study on the Formation of Urea or Salt Induced Vesicles in Built-system Surfactant

Chang Gang HU, Hui XIE, Gan Zuo LI, Ya AN, Zhong Ni WANG, Xiao Yi ZHANG, Jing Ping TIAN

中国化学快报. 2005, 16(05): 681-684.

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可视化

The spontaneous formation of vesicles in the aqueous of cationic surfactant phosphate(PTA) and anionic surfactant sodium dodecyl sulfate (SDS) at certain mixing ratios have obtained¹.The addition of urea or NaI will expand the range of spontaneous vesicle formation. The fact is demonstrated by negative-staining transmission electron microscope(TEM) and dynamic light scattering(DLS) methods. The phenomenon especially in the part of urea is reported by us at first.Mechanism of urea/NaI-induced vesicles formation is discussed from the viewpoint of the molecular geometry packing parameter f, conformation and interaction.

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Photocatalytic Synthesis of Oxygenates from Gaseous CO₂ and CH₄ over Semiconductor

Da Xin SHI, Ya Qing FENG, Shun He ZHONG

中国化学快报. 2005, 16(05): 685-687.

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可视化

Photoinduced synthesis of CO₂ and CH₄ was investigated using a batch reaction system on several photoactive materials supported on silicon dioxide. Single semiconductor showed higher selectivity to C1 compounds. The production of C2-C3 oxygenates took place preferentially on composite semiconductor photocatalysts. In particular, it was found that acetone was the primary product over Cu/CdS-TiO₂/SiO₂.

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Dynamic Study of Gemini Surfactant and Single-chain Surfactant at Air/Water Interface

Yi Jian CHEN, Gui Ying XU, Shi Ling YUAN, Hai Ying SUN

中国化学快报. 2005, 16(05): 688-690.

摘要 ( )

可视化

Molecular dynamics (MD) simulation are used to study the properties of gemini surfactant of ethyl-α,ω-bis(dodecyldimethylammonium bromide) (C₁₂C₂C₁₂) and dodecyltrimethylammonium bromide (DTAB) at the air/water interface, respectively. In the two systems,the surfactant concentrations are both 28 wt.%, and other conditions are also the same. After reaching the thermodynamic equilibrium, the concentration profiles, the radial distributions functions (RDF) and the mean squared displacement (MSD) are investigated. Theresults reveal that the surface activity of C₁₂C₂C₁₂ suffactant is higher than DTAB surfactant.

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Combination of Partial Oxidation and CO₂ Reforming of Methane over Monolithic Ni/CeO₂-ZrO₂/γ-Al₂O₃ Catalyst

Xuan LI, Yun TENG, Mao Chu GONG, Yao Qiang CHEN

中国化学快报. 2005, 16(05): 691-692.

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可视化

A new monolithic Ni/CeO₂-ZrO₂/γ-Al₂O₃ catalyst for combined partial oxidation and CO₂ reforming of methane was prepared. The result shows that the addition of O₂ to the feed can improve the activity of the catalyst and adjust the H₂/CO ratio of the productive gases.

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A ZINDO/1-CI Study of Substituted Triphenylamines for Use as Charge Transfer Materials

Qiang LI, Xiao Xiang ZHANG, Yi MENG, Min Bo CHEN

中国化学快报. 2005, 16(05): 693-696.

摘要 ( )

可视化

Electronic spectra of substituted triphenylamines are investigated in this paper by time dependent perturbation theory and ZINDO/1-CI calculation.

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Kinetic of Adsorption of Urea Nitrogen onto Chitosan Coated Dialdehyde Cellulose under Catalysis of Immobilized Urease

Zu Pei LIANG, Ya Qing FENG, Zhi Yan LIANG, Shu Xian MENG

中国化学快报. 2005, 16(05): 697-700.

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可视化

The adsorption of urea nitrogen onto chitosan coated dialdehyde cellulose (CDAC)under catalysis of immobilized urease in gelatin membrane (IE) was studied in batch system. The pseudo first-order and second-order kinetic models were used to describe the kinetic data, and the rate constants were evaluated. The experimental data fitted well to the second-order kinetic model.

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Removal of Safranine from Aqueous Solution by Using Adsorptive Bubble Separation Techniques

Chung Shin LU, Chiing Chang CHEN, Ya Ping SU, Kung Tung CHEN

中国化学快报. 2005, 16(05): 701-704.

摘要 ( )

可视化

Safranine, a cationic dye, was removed from synthetic wastewater by ion flotation.Over 98% of safranine was removed from the solution in 10 min. A stoichiometric amount of surfactant (1 mol of surfactant to 1 mol of dye) was found to be most effective for safranine removal. The separation efficiency of safranine decreased with increasing concentration of NaNO₃. Safranine was also removed by adsorbing colloid flotation technique using Fe(OH)₃ as the coagulant. Sodium lauryl sulfate was used as the collector, and over 97% of safranine was removed in 5 min. The separation efficiency decreased with increasing ionic strength of the solution. The deleterious effect of neutral salt was compensated somewhat with the aid of A1³⁺ as the activator. Both ion flotation and adsorbing colloid flotation may be applicable in the removal of safranine from wastewater.

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Theoretical Study on the Isomerization Mechanism of Enol Ester from 2-Acyl-1, 3-cyclohexanediones

Yan Hua WANG, Jian Wei ZOU, Bing ZHANG, Min ZENG, Gui Xiang HU, Ke Wen ZHENG, Qing Sen YU

中国化学快报. 2005, 16(05): 705-708.

摘要 ( )

可视化

The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a),respectively. The base catalytic effects of solvent triethylamine on these two reactions were also evaluated. It is demonstrated that path B is more preferable than path a due to low barrier height for the rate-determining step.

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Studies on the Physical Properties of Alkanes Using Edge-adjacency Information Topological Index

Cai Hua NI, Xian Yu ZENG, He HUANG

中国化学快报. 2005, 16(05): 709-710.

摘要 ( )

可视化

Edge-adjacency index and information topological index for 82 molecules of alkanes have been constructed and calculated. The topological indices were used to correlate with seven physical properties of the alkanes. Some empirical equations were obtained through regression.The regression and calculation results show a good agreement of the topological indices and the properties.

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2005年, 第16卷, 第05期　刊出日期：2005-05-20

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2005年, 第16卷, 第05期 刊出日期：2005-05-20

2005年, 第16卷, 第05期　刊出日期：2005-05-20