中国化学快报

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Synthesis and Characterization of Poly(ether imide)s Containing m-Methyl and Phthalazinone Moieties

Jin Yan WANG, Shu De XIAO, Xi Gao JIAN

中国化学快报. 2003, 14(04): 331-332.

摘要 ( )

可视化

Three novel poly(ether imide)s were synthesized by one-step solution polymerization from 2-(3, 4-dicarboxyl-N-phenyl)-4-(3', 4'-dicarboxyl-phenoxyl-4-(2-methyl)-phenyl)-2, 3-phthal-azin-1-one dianhydride and three amines, and characterized. The polymers show good solubility and thermal properties.

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A New Solvent-free Synthesis of α,α'-Dibenzylidenecycloalkanones from Acetals with Cycloalkanones under Microwave Irradiation

Dan Feng HUANG, Jin Xian WANG, Yu Lai HU

中国化学快报. 2003, 14(04): 333-334.

摘要 ( )

可视化

A new rapid synthetic method is described for synthesis of α,α'-dibenzylidene-cycloalkanones by the reaction of acetals and cycloalkanones without solvent using BF₃·Et₂O as catalyst under microwave irradiation.

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Polystyrene-supported Benzyl Selenide:An Efficient Reagent for Highly Stereocontrolled Synthesis of Substituted Olefins

Wei Ming XU, Li Ming YU, Xian HUANG

中国化学快报. 2003, 14(04): 335-337.

摘要 ( )

可视化

Polystyrene-supported benzyl selenide has been prepared. This novel reagent was treated with LDA to produce a selenium stabilized carbanion, which reacted with alkyl halide, followed by selenoxide syn-elimination, to give substituted olefins stereospecificly.

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Study on the Synthesis of Metabolite CM2 of Clausenamide

Xing Zhou LI, Ke Mei WU, Liang HUANG

中国化学快报. 2003, 14(04): 338-340.

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可视化

Synthesis of the optically active metabolite of clausenamide CM2 (3, 5-dihydroxy-5-(α-hydroxylbenzyl)-1-methyl-4-benzylpyrrolidin-2-one) from 3-O-acetyl-clausenamide was described.

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A Novel Access to Organostannane Compounds under Ultrasound Irradiation

Li Zeng PENG, Tian Sheng MEI, Tao ZHANG, Yu Lin LI

中国化学快报. 2003, 14(04): 341-342.

摘要 ( )

可视化

A simple and efficient procedure has been developed for the synthesis of organostannane compounds by one-pot reaction of stannane halides, magnesium turnings and organic halides in the presence of 1, 2-dibromoethane under ultrasound irradiation for the first time.

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Synthesis and Biological Activities of N-Phosphoryl Branched Peptides

Sheng Li CAO, Yu Yang JIANG, Yu Ping FENG, Yan Ling NIU, Yu Fen ZHAO

中国化学快报. 2003, 14(04): 343-346.

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可视化

A series of N-phosphoryl branched peptides were synthesized by coupling of various N-phosphoryl amino acids to L-Lysine methyl ester, and their structures were confirmed by ³¹P NMR, ¹H NMR, MS and elemental analysis. The results of cell biological tests indicated that compound 1d and 1e obviously inhibited the growth of both K562 and A2780 cells.

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A New Technique of Synthesizing 10-Hydroxy-5-methyl-5,10-dihydrophenophosphazine 10-Oxide

Zhi Gang YIN, De Feng ZHAO

中国化学快报. 2003, 14(04): 347-350.

摘要 ( )

可视化

10-Hydroxy-5-methyl-5, 10-dihydrophenophosphazine 10-oxide (1) was prepared by a new technique of treating 10-methoxy-5,10-dihydrophenophosphazine 10-oxide (2) with an equivalent of NaH in anhydrous DMF, and then at 120℃ for 3~4 h, which not only avoided poisonous and expensive methyl iodide used in literature, but made the consumption of NaH greatly decrease as well. The possible reaction mechanism was also described. The chemical structure of 1 was confirmed by IR, NMR, and mass spectroscopy.

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Studies on a New Usage of Hypophosphorous Acid-iodine System in N-C Bond Cleavage

Ge MENG, Ling ZHAO, You Fu LUO, Fen Er CHEN

中国化学快报. 2003, 14(04): 351-354.

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可视化

A mixture of hypophosphorous acid (H₃PO₂) and iodine in acetic acid can cleave the N-alkyl bond in a variety of N-1 substituted pyrimidine derivative in relatively high yields, withoutany damage to the amido bond in the non-nucleosides pyrimidine base skeleton.

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Henry Reaction in Aqueous Media:Chemoselective Addition of Aldehydes

Cun Liu ZHOU, Yu Qing ZHOU, Zhi Yong WANG

中国化学快报. 2003, 14(04): 355-358.

摘要 ( )

可视化

The chemoselective addition of aldehydes in aquoues medium was obtained under mild condition using improved Henry reaction.

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An Efficient Synthetic Method of Nordihydroguaiaretic Acid (NDGA)

Ya Mu XIA, Xiao Ping CAO, Kun PENG, Xin Feng REN, Xin Fu PAN

中国化学快报. 2003, 14(04): 359-360.

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可视化

Nordihydroguaiaretic acid (NDGA) has been synthesized in nine steps from piperonal using Stobbe condensation as the key step with high yield. By this approach, five relative natural products were obtained.

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The Synthesis of Gracillin and Dioscin:Two Typical Representatives of Spirostanol Glycosides

Chuan Chun ZOU, Shu Jie HOU, Ping Sheng LEI, Xiao Tian LIANG

中国化学快报. 2003, 14(04): 361-364.

摘要 ( )

可视化

Two spirostanol saponins (gracillin and dioscin) which have the typical sugar moieties were synthesized facilely by a general approach.

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An Efficient Process for Preparing 4-Methyl-2-phenyl Piperazine Hydrochloride and its Derivatives

Bai Shu GUO, Yu She YANG, Ru Yun JI

中国化学快报. 2003, 14(04): 365-367.

摘要 ( )

可视化

An improved method for preparation of 4-methyl-2-phenyl piperazine and its derivatives with higher yield and inexpensive reagents was developed, the products were characterized by ¹H-NMR and MS.

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Dechlorination of Aromatic Chlorides in Aqueous System Catalyzed by Functionalized MontK10 Supported Palladium-tin

Yu Huan DONG, Qing Zhao MENG, Ru Hong KANG

中国化学快报. 2003, 14(04): 368-370.

摘要 ( )

可视化

A novel bisupporter bimetal catalyst PVP-PdCl₂-SnCl₄/MontK10-PEG400, using for dehalogenation of insoluable aromatic halides in aqueous system, has shown high dechlorination activity and selectivity, without any organic solvent or phase transfer catalyst. The conversion of aromatic chlorides can reach 100%. The catalyst is easy to prepare and has good reusability.

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Regioselective Bromination of 3, 4-Dimethoxytoluene with N-Bromosuccinimide

Hong Min MA, Zhan Zhu LIU, Shi Zhi CHEN

中国化学快报. 2003, 14(04): 371-374.

摘要 ( )

可视化

The selective brominations of 3, 4-dimethoxytoluene with N-bromosuccinimide were reported. The nuclear and side-chain brominated products were obtained under different reaction conditions. The mechanism was also discussed.

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Preparation for Supramolecular Complexes of Chiral Diols BDPDD, DMBDPD and BINOL with Some Prochiral Compounds

De Jun LIU, Zi Xing SHAN, Rong WANG, Jin Gui QIN

中国化学快报. 2003, 14(04): 375-378.

摘要 ( )

可视化

Interaction between chiral diols BDPDD, DMBDPD and BINOL with prochiral compounds was examined and some new supramolecular complexes were prepared. It was found that these chiral hosts could include prochiral guests,α,β-unsaturated compounds or piper-azinedione derivatives to give inclusion crystals in different molar ratio. Formations of these supramolecular complexes were characterized by the data of IR and ¹H NMR spectra.

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A new Furostanoside from Asparagus filicinus

Yan Fang LI, Li Hong HU, Feng Chang LOU, Jian Rong HONG

中国化学快报. 2003, 14(04): 379-382.

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可视化

A new furostanoside, aspafilioside D (1) has been isolated from the root of Asparagus filicinus. Its structure was determined by spectral and chemical methods.

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A New Diterpene from Spiraea japonica var. ovalifolia

Guo Ying ZUO, Hong Ping HE, Bin Gui WANG, Xin HONG, Yi Ming HU, Xiao Jiang HAO

中国化学快报. 2003, 14(04): 383-384.

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可视化

A new diterpenoid,15-O-acetylspiraminol(1),was isolated from the aerial parts of Spireae japonica L.f.var.ovalifolia.The structure was charaterized mainly based on spectral analysis.

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Dissectol A, A Novel Monoterpene Glycoside from Incarvillea dissectifoliola

Wei CHEN, Yue Mao SHEN, Jian Chu XU

中国化学快报. 2003, 14(04): 385-388.

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可视化

Dissectol A, a novel monoterpene glycoside was isolated from the methanol part of the 95% EtOH extract of Incarvillea dissecfoliola and its structure was determined by 1D and 2D NMR data.

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Three New Cucurbitacins from Hemsleya lijiangensis

Ming Hua CHIU, Juan GAO

中国化学快报. 2003, 14(04): 389-392.

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可视化

Three new cucurbitacins were isolated from the BuOH extract of the rhizomes of Hemsleya lijiangensis. Their structures were elucidated as 23, 24-dihydro cucurbitacin F-16, 25-diacetate (1), 23,24-dihydro cucurbitacin F-16, 25-diacetate-2-O-β-D-glucopyranoside (2), 23, 24-dihydro-cucurbitacin F-16-acetate (3), respectively; by spectral analyses.

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New Eudesmane and Eremophilane Derivatives from Laggera Alata

Qun Xiong ZHENG, Zhao Jun XU, Xian Feng SUN, Françise GUÉRITTE, Michele CESARIO, Christopher H. K. CHENG, Han Dong SUN, Yu ZHAO

中国化学快报. 2003, 14(04): 393-396.

摘要 ( )

可视化

From the aerial part of Laggera alata, a novel eremophilanoid (1) as well as two new eudesmanoids (2-3) were isolated. Their structures were elucidated by 2D-NMR technique and X-ray diffraction studies. The cytotoxic activities of these sesquiterpenes were also investigated.

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Investigation on the Extraction Mechanism of Au (I) from Cyanide Solution with Quaternary Ammonium System

Jian Zhun JIANG, Wei Hong LI, Wei Jin ZHOU, Hong Cheng GAO, Jin Guang WU, Guang Xian XU

中国化学快报. 2003, 14(04): 397-400.

摘要 ( )

可视化

The mechanism of Au (I) extraction has been characterized using ¹⁹⁸Au radiometry, thermodynamic equilibrium, Karl-Fischer titration and FT-IR spectroscopy techniques. The results indicate that the extraction follows ionic combination and solvent interaction mechanism. The stoichiometry of the extracted species is 1:1:4:4 for TDMBA⁺:Au(CN)₂^-:TBP:H₂O. The microstructure model of the extracted complex is a supramolecular structure via hydrogen bonding, ion dipole interaction and ionic combination. The extraction process can be described as micelles in the aqueous phase transfer into the organic phase and reversed micelles or microemulsion (W/O) form in the organic phase.

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Influence of Mobile Phase Composition on the Enantioseparation of Methoxyl Flavanones with Self-prepared CDMPC Column and Chiral Recognition Mechanism

Bao Hai SHAO, Xiu Zhu XU, Jian De LU, Li ZOU, Xiao Yun FU

中国化学快报. 2003, 14(04): 401-403.

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可视化

The influence of different alcohol modifiers in mobile phase on the chiral separation of 4'-methoxyl flavanone, 5-methoxyl flavanone and 6-methoxyl flavanone on cellulose tris (3, 5-dimethylphenylcarbamate) (CDMPC) column was studied and the chiral recognition mechanism was discussed. Using hexane-tert-butanol (1.31 mol L^-1) as the mobile phase, those three methoxyl flavanones were excellently separated on CDMPC chiral column.

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A New Method for Decreasing Mass Limit of Detection and Increasing Number of Theoretical Plates in Capillary Electrophoresis with Amperometric Detection

Xue Mei SUN, Qian Feng WENG, Wen Rui JIN

中国化学快报. 2003, 14(04): 404-406.

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A new method was developed to decrease the mass limit of detection (LOD) and increase the number of theoretical plates (N) in capillary electrophoresis with amperometric detection. When the single microcylinder electrode, the 10 μm ID capillary with the etched detection end and the in-capillary alignment were used, the mass LOD for phenol was reduced 124 times and N was increased 36 times in comparison with the normal situation.

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Phase Transition and Micellization of Temperature Responsive Dextran-graft-poly (N-isopropylacrylamide) Polymers

Li Qun WANG, Ke Hua TU, Yu Ping LI, Jie ZHANG

中国化学快报. 2003, 14(04): 407-410.

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Phase behavior and micellization of dextran-graft-poly (N-isopropylacrylamide) (PNIPAAm) polymers in aqueous solution are investigated in this paper using DSC and AFM methods. It is found that with the increase of grafting (G%) of the copolymers the endothermic enthalpy during the phase transition increases significantly and the transition temperature decreases slightly. The phase transition behavior of the copolymers is scanning rate dependent. Micelles are formed whenever the solution temperature is raised above the LCST of the copolymers. It is proposed that by using this thermal responsive property of the copolymers, drugs could be incorporated into the micelles without employing any organic solvent.

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Capacitance Characterization of the Effect of pH Value on the Self-assembled Monolayers of Octadecanethiol

Ke Qiang DING, Qing Fei WANG, Ru Ting TONG, Hui Bo SHAO

中国化学快报. 2003, 14(04): 411-412.

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In this paper, the membrane capacitance (C_m), which was obtained from the electro-chemical impedance spectroscopy (EIS) method, was used to characterize the effect of pH value on the self-assembled monolayers (SAMs) of octadecanethiol(18SH) for the first time. The results not only strongly proved that inorganic ions could penetrate the SAMs of 18SH, but also ascertained that SAMs of 18SH were not an absolute of free of ion-penetration. Verifying the existence of pin-holes in the octadecanethiol SAMs was the main contribution of this paper, which coincided with the former conjecture very well.

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Synthesis and Reaction of[MnRe(CO)₆(μ-SH)(μ-SC(H)PPr₃ⁱ)(PPh₃)]

Yong Qiang MA, Xiao CHEN, Jing LI, Qing Lan XIE, Hong Gen WANG

中国化学快报. 2003, 14(04): 413-416.

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可视化

The synthesis, the crystal structure and the reaction of the hetero-binuclear complex[MnRe(CO)₆(μ-SH)(μ-SC(H)PPr₃ⁱ)(PPh₃)] are reported. The results of single crystal X-ray structure analysis showed that the fragments Mn(CO)₃ and Re(CO)₃ were bridged by SH and SC(H)PPr₃ⁱ. The title complexes can react with BuⁿLi and RX forming complexes MnRe(CO)₆(μ-SR)(μ-SC(H)PPr₃ⁱ)(PPh₃) (R=Me, CH₂CH=CH₂, SnBu₃ⁿ).

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Structures and Mechanical Properties of PVC/Na⁺-Montmorillonite Nanocomposites

Chao Ying WAN, Xiu Ying QIAO, Yong ZHANG, Yin Xi ZHANG

中国化学快报. 2003, 14(04): 417-418.

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可视化

Poly (vinyl chloride)/Na⁺-montmorillonite (PVC/MMT) nanocomposites with different MMT contents were prepared via melt blending. Wide-angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM) were used to characterize the structures. Effects of MMT content on the mechanical properties were also studied. It is found that PVC molecular chains can intercalate into the gallery of MMT layers during melt blending process, the stiffness and toughness of the composites are improved simultaneously within 0.5~7wt% MMT content, and the transparency and mechanical properties decrease as MMT content further increases.

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TEM Study on the Formation Process of TiO₂ Nanotubes

Jing Wei ZHANG, Xin Yong GUO, Zhen Sheng JIN, Shun Li ZHANG, Jing Fang ZHOU, Zhi Jun ZHANG

中国化学快报. 2003, 14(04): 419-422.

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可视化

The process, that the polycrystalline TiO₂ powders were converted into TiO₂ nanotubes, was observed with transmission electron microscope. The results obtained indicated that in concentrated NaOH aqueous solution, anisotropic swelling appears on the polycrystalline TiO₂ granula at first, and then the nanotubes are formed.

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A New Biochemical Way for Conversion of CO₂ to Methanol via Dehydrogenases Encapsulated in SiO₂ Matrix

Hong WU, Zhong Yi JIANG, Song Wei XU, Shu Fang HUANG

中国化学快报. 2003, 14(04): 423-425.

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可视化

CO₂ is converted to methanol through an enzymatic approach using formate dehydro-genase (F_ateDH), formaldehyde dehydrogenase (F_aldDH) and alcohol dehydrogenase (ADH) co-encapsulated in silica gel prepared by modified sol-gel process as catalysts, TEOS as precursor, NADH as an electron donor. The highest yield of methanol was up to 92.1% under 37℃, pH7.0 and 0.3Mpa.

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Preparation of Phenolic Resin/Silver Nanocomposites via in-situ Reduction

Lin Jie ZHI, Jin Yue TANG, Tong ZHAO, Yun Zhao YU

中国化学快报. 2003, 14(04): 425-428.

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可视化

Resol type phenolic resin/silver nanocomposite was prepared by in-situ reduction method, in which the curing of phenolic resin and the formation of silver nano-particles took place simultaneously. The silver ions were reduced completely to silver nanoparticles, which were dispersed homogeneously in the resin matrix with narrow size distribution.

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Preparation of La-Ti Composite Oxide Nanocrystal and Examination of Their Surface Topography with Atomic Force Microscope

Li GU, Yuan Liang WANG, Li Ling TANG, Jiu Jin ZHU, Jun Han WU

中国化学快报. 2003, 14(04): 429-432.

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可视化

With sol-gel method, nanometer La-Ti composite oxide was successfully prepared at a low temperature (750~800℃) using polyethylene glycol as dispersant. By means of atomic force microscope, the surface pattern, particle size distribution, and specific surface area were studied. The compound particle surface appears as a smooth sheet, the mean size of the compound is 25.38 nm. On the specific surface, the particle erects at a height of 4.69 nm. The surface area is 58.90 nm². The La-Ti composite oxide nanocrystal prefers to narrow and even particle size distribution and the homogeneity of surface topography.

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Synthesis, Structure and Conductivity of the New Charge-transfer Salt (ET)₂(CH₂=CH-CH₂-SO₃)·H₂O

Zhi LIU, Qi FANG, Wen Tao YU, Min Hua JIANG, De Qing ZHANG, Dao Ben ZHU

中国化学快报. 2003, 14(04): 433-436.

摘要 ( )

可视化

Electro-oxidation of 3,4,3', 4(-bis(ethylenedithio)-2,2',5,5(-tetrathiafulvalen (abbr. ET) in the presence of allylsulfonate affords a new charge-transfer salt (ET)₂(CH₂=CH-CH₂-SO₃)·H₂O. The single crystal structure of the title compound is determined to be in orthorhombic crystal system, Pma2 space group. This salt is a semiconductor and its room-temperature conductivity is 0.0489Ω^-1·m^-1.

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Theoretical Investigation on Radical-Coupling Reactivity of Indolinonic Aminoxyls

Hong Yu ZHANG, Lan Fen WANG

中国化学快报. 2003, 14(04): 437-440.

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可视化

Indolinonic aminoxyls can effectively scavenge various radicals by directly coupling with them or by imitating superoxide dismutase. To better understand the radical-coupling reactions, DFT method B3LYP/6-31G(d,p) was employed to calculate variations of free energy for the coupling reactions and other physico-chemical parameters. The radical-coupling activity difference between aminoxyls was elucidated to a large extent in terms of electronic properties of substituents.

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2003年, 第14卷, 第04期　刊出日期：2003-04-20

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2003年, 第14卷, 第04期 刊出日期：2003-04-20

2003年, 第14卷, 第04期　刊出日期：2003-04-20