中国化学快报

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Isomerization of 4-Amino-6-tert-butyl-3-methylthio-1, 2,4-triazin-5(4H)-one with Base

Hong Chao GUO, Shang Zhong LIU, Xue Tai HOU, Min WANG

中国化学快报. 2001, 12(09): 753-756.

摘要 ( )

可视化

Isomerizaton of 4-amino-6-tert-butyl-3-methylthio-1, 2, 4-triazin-5 (4H)-one in the presence of base is described. Mechanism of this rearrangement reaction involving four-member ring intermediate formation has been proposed.

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Intramolecular Hydrogen Bond Self-template Synthesis of Some New Robson-type Macrocyclic Ligands

Jin Cai WU, Ning TANG, Wei Sheng LIU, Min Yu TAN, Albert S. C. CHAN

中国化学快报. 2001, 12(09): 757-760.

摘要 ( )

可视化

The intramolecular hydrogen bond self-template effect was suggested in the process of directly synthesizing the first six chiral metal-free Robson-type macrocyclic ligands. These ligands were characterized by ¹H NMR, IR, FAB-MS.

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Microwave-assisted Polycondensation of L-2-Hydroxy 3-phenylpropanoic Acid

Li Jian LIU, Li Qiong LIAO, Chao ZHANG, Feng HE, Ren Xi ZHUO

中国化学快报. 2001, 12(09): 761-762.

摘要 ( )

可视化

Amorphous poly (L-2-hydroxy-3-phenylpropanoic acid) (PLHPPA) was synthesized by the microwave-assisted polycondensation of L-2-hydroxy-3-phenylpropanoic acid (LHPPA). The weight average molar mass (Mw) of PLHPPA ranged from 3600 to 5300 and polydispersity index (Mw/Mn) from 1.0 to 1.4 when the reaction mixture was irradiated by microwave at 255, 340 and 510 w for 1 to 10 h, respectively.

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Microwave-Promoted Rapid Synthesis of 1-Aryl-1, 2, 3-Triazoles

Lan TAO, Ling Li ZHANG, Shui Jun SHEN, Xiao Ping HAN

中国化学快报. 2001, 12(09): 763-764.

摘要 ( )

可视化

Aryl azides and α-keto phosphorus ylides were reacted within 4~10 minutes with silica gel support, under microwave irridiation to afford corresponding l-aryl-l, 2, 3-triazoles in moderate to good yields.

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Two Chiral Building Blocks for the Stereocontrolled Synthesis of Anti-and Syn-1, 3-Diols

Yong WU, Mei GUAN, Zheng XU, Li Cheng, Xiao Chun WU

中国化学快报. 2001, 12(09): 765-766.

摘要 ( )

可视化

Two chiral building blocks 1 and 2 for anti-and syn-l, 3-diols has been achieved in 8steps and 7 steps respectively, starting from the readily available and inexpensive D (+)-xylose 3.

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Synthesis of (s)-(-)-Benzyl-2-tert-butoxycarbonyl amino-4-iodobutyrate

Xin Rong QIN, Quan LI, Yu Yuan XIE

中国化学快报. 2001, 12(09): 767-768.

摘要 ( )

可视化

A convenient method to synthesize (s)-(-)-benzyl-2-tert-butoxy carbonylamino-4-iodobutyrate from L-(+)methionine 1 was reported, the enantiomeric purity of the product was established by comparison of optical rotation data with literature values, indicating that the reaction process occurred without racemization.

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Synthesis of (S, S)-1, 5-bis(4-alkyl-5-hydroxy-2-oxo-3-azapentyl) 1, 5-diazacyclooctane

Zhi Liang SHANG, Zhi Cai SHANG, Qing Sen YU

中国化学快报. 2001, 12(09): 769-770.

摘要 ( )

可视化

Synthesis of a series of chiral aza crown ethers ((S,S)-1, 5-bis (4-alkyl-5-hydroxy-2-oxo-3-azapentyl)-1, 5-diazacyclooctane) are described.

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First Total Synthesis of Cleroindicin B, (±) Cleroindicin C and E

Jin CHEN, Jun TIAN, Feng E WU, Norio Kawabe, Masahiko Tokuda

中国化学快报. 2001, 12(09): 771-774.

摘要 ( )

可视化

Cleroindicin B, C and E, three new natural products originally isolated from Clerodendrum indicum, have been synthesized (in racemic forms for Cleroindicin C and E) by a facile route, starting from 2-(p-methoxy-phenyl) ethanol 1. The (±) cleroindicin C (5) has been resovled by the enantioselective inclusion methodology.

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Design, Synthesis and in vitro Evaluation of a New Class of Novel Cyclooxygenase-2 Inhibitors: 3, 4-diaryl-3-pyrrolin-2-ones

Ai Ping BAI, Zong Ru GUO, Wen Hui HU, Fang SHEN, Gui Fang CHENG

中国化学快报. 2001, 12(09): 775-778.

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可视化

design, synthesis and in vivo evaluation of a new class of COX-2 inhibitors 3,4-diaryl-3-pyrrolin-2-ones are reported.

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Design and Synthesis of Lipids Bearing Nucleosides as Gene Vectors

Man Zhou ZHU, Qi Hua WU, Qing Xiang GUO

中国化学快报. 2001, 12(09): 779-782.

摘要 ( )

可视化

Some novel lipids bearing nucleosides were designed and synthesized as gene vectors,and the structures of these compounds were characterized by UV, IR, ¹HNMR, ¹³CNMR and elemental analysis.

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A Theoretical Study on the Stereoisomerism in the Complex of Cucurbit[8]uril with 2, 6-Bis(4, 5-dihydro-1H imidazol-2-yl)naphthalene

Ting Wei MU, Lei LIU, Ke Chun ZHANG, Qing Xiang GUO

中国化学快报. 2001, 12(09): 783-786.

摘要 ( )

可视化

Semiempirical PM3 and density function theory B3LYP/3-2 1 g^* calculations in vacuum and in water indicated that the "syn" orientation was preferred in the 1:2 complex of cucurbit[8]uril with protonated 2, 6-bis(4, 5-dihydro-lH-imidazol-2-yl)naphthalene. The π-π stacking interaction between the two substrate molecules was proposed as the physical origin of such a behavior.

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Two New Compounds from Goniothalamus Cheliensis Hu

Si WANG, Pei Cheng ZHANG, Ruo Yun CHEN, De Quan YU

中国化学快报. 2001, 12(09): 787-790.

摘要 ( )

可视化

Two new compounds, gonioquinone (1) and goniofufurone acetonide (2), have been isolated from the roots of Goniothalamus cheliensis Hu. Their structures were determined on the basis of spectral and chemical evidence.

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A New Flavone from the Roots of Uvaria macrophylla

Hai Ling ZHANG, Ruo Yun CHEN

中国化学快报. 2001, 12(09): 791-792.

摘要 ( )

可视化

A New flavone named Macrophyllol was isolated from the roots of Uvaria macrophylla.The structure of 1 was elucidated on the basis of spectroscopic evidence.

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A Phenolic Glucoside from Alangium plantanifolium

Wen Yan HU, Wen Ping XU, Jian Gong SHI, Yong Chun YANG, Guang Xiong ZHOU

中国化学快报. 2001, 12(09): 793-796.

摘要 ( )

可视化

A novel phenolic glucoside was isolated from stem barks of Alangium plantanifolium,its structure was elucidated to be 1-O-[2-(l-hydroxy-6-oxocyclohex-2-ene-l-carboxymcthyl)-phenyl]-4, 6-O-[(S)-4, 4', 5, 5', 6, 6'-hexahydroxydi-phenoyl]-β-D-glucopyranose 1 byspectroscopic methods including 2D NMR techniques.

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A New Ecdysteroid from Rhaponticum uniflorum

Yong Hong ZHANG, Xin Pu LI, Zhi Gang LU, Han Qing WANG

中国化学快报. 2001, 12(09): 797-798.

摘要 ( )

可视化

A new phytoecdysteroid was isolated from the root of Rhaponticum uniflorum. Its structure has been shown to be 2, 3, 20, 22-diacetonide ajugasterone.

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Flow Injection Chemiluminescence Analysis of Low Level Concentration of Hydrazine

Zheng Hua SONG, Lin WANG, Ji Hong LÜ, Tie Zhu ZHAO

中国化学快报. 2001, 12(09): 799-802.

摘要 ( )

可视化

Combined with flow-injection (Fl) technology, a simple chemiluminescence(CL)method was developed for hydrazine determination in this paper. It was found that hydrazine could greatly decrease the strong CL signal produced by the reaction between luminol and hexacyanoferrate (Ⅲ) in alkaline medium. The decreased CL intensity was linear with hydrazine concentration in the range of 5.0×10^-9 gmL-1 to 4.0×10^-5 gmL1, and the limit of detection was 2.0×10^-9 g mL-1 (3Ó) with a relative standard deviation of 2.4~4.1% (n=5).

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Synthesis of Cellulose Tris (4-Methylbenzoate) as Gas Chromatographic Stationary Phase and its Characterization

Jie Hua SHI, Gen Sheng YANG, Yun Feng ZHENG

中国化学快报. 2001, 12(09): 803-806.

摘要 ( )

可视化

The cellulose tris (4-methylbenzoate) has been synthesised by the catalytic method and was supported at Gas Chrom Q. The absorption capability of cellulose tris (4-methylbenzoate)used as a gas chromatographic stationary phase was characterized by chromatographic method and the Clausius-Clapeyron equation. However, n-alcohols (C₁-C₈) were successfully separated on the column packed with Gas Chrom Q coated with cellullose tris (4-methylbenzoate).

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Theoretical Study of the Sensitivity-Improvement Effect of Phosphoryl Group in Mass Spectrometry of Small Peptides

Yang JIANG, Bo TAN, Yu Fen ZHAO

中国化学快报. 2001, 12(09): 807-808.

摘要 ( )

可视化

It was found that phosphorylation of small peptide could improve the sensitivity in mass spectrometry. Density functional theory calculations showed that the energy for the protonation of N-(O, O'-dimethyl) phosphoryl glycylglycine is lower than that of glycylglycine. These could help to understanding the experimental results.

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Tb(Ⅲ) Speciation in Human Blood Plasma by Computer Simulation

Xing LU, Yue WANG, Hai Yuan ZHANG, Chun Ji NIU, Jia Zuan NI

中国化学快报. 2001, 12(09): 809-812.

摘要 ( )

可视化

A multi-phase model was developed and Tb(Ⅲ) speciation in human blood plasma was studied. At a concentration below 3.744×10^-4mol/L (or at the concentration), Tb(Ⅲ) is mostly bound to phosphate to form precipitate of TbPO₄. As the concentration of Tb(Ⅲ) increases,phosphate is exceeded and another kind of precipitate of Tb₂(CO₃)₃ appears. Among soluble Tb(Ⅲ) species, Tb(Ⅲ) mainly distribute in [Tb (Tf)] at low concentration and in [Tb (HSA)], [Tb₂(Tf], [Tb (IgG)], [Tb (Lactate)]²⁺, [Tb (CitArgH)] and free Tb(Ⅲ) at high concentration.

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Action Mechanism Research of Lanthanons to Slow Vacuolar Ion Channels in Raphanus Satirus L. (Xinlimei) Radish by Patch-Clamp

Pin YANG, Yan Fang SHANG, Zhen Ming PEI

中国化学快报. 2001, 12(09): 813-814.

摘要 ( )

可视化

We used whole-vacuolar patch-clamp recording mode to study the action mechanism of La³⁺ to Slow Vacuolar (SV) channels for the first time. We recorded SV channel currents of Xinlimei (Raphanus satirus L.) vacuolars. The minimum activation potentials of voltage-dependent SV channels lied in 25±5 mV. The increase in cytoplasmic Ca²⁺ led toenhancement of SV-type currents. It was found that the threshold potential of activation shifted towards more depolarized values whenever cytoplasmic Ca²⁺ was increased. When 10^-10 mol/Lfree La³⁺ was added to the bath, SV-type current was suppressed by 60~75%. These data showed La³⁺ reduced ion permeabilities of Xinlimei root vacuolar membrane.

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Na⁺/Ca²⁺ Exchange-mediated La³⁺ Entry in Human Lymphocytes

Chun Ying WEI, Pin YANG, Hai Yan WANG

中国化学快报. 2001, 12(09): 815-816.

摘要 ( )

可视化

We determined whether La³⁺ enter human peripheral blood lymphocytes via Na⁺/Ca²⁺exchanger (measured with fura-2) We first compared the sensitivity of fura-2 with La³⁺ and Ca²⁺,the result indicates that the sensitiwty of fura-2 for La³⁺ is much greater than for Ca²⁺ . La³⁺ orms a 1:1 La³⁺-fura-2 complex (apparent dissociation constant=l.7%#215;l0-12mol/L, pH 7.05).Ouabain-pretreated cells, suspended in Na⁺-free medium, showed that La³⁺ can enter human lvmphocvtes via the Na⁺_i/Ca²⁺ (La³⁺)_o exchanger and is found to be about 10^-12 mol/L in cells exp osed to 0.4 mmol/L La³⁺. Otherwise, the higher concentration (0.1 mmol/L) blocks theNa⁺_i/Ca²⁺(La³⁺)_o exchange-mediated influx of Ca²⁺, but the lower concentration (0.01 mmol/L)appears to increase Ca²⁺ entry.

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An efficient Approach to Modify the Catalyst Activity for the Hydrogenation of Nitrobenzene

Wei Min MO, Bo Shun WAN, Shi Jian LIAO

中国化学快报. 2001, 12(09): 817-820.

摘要 ( )

可视化

The addition of a suitable amount of PPh₃ to PdCI₂ or PdCl₂(PhCN)₂ in situ canconsiderably increase the catalytic activity in the hydrogenation of nitrobenzene, while the catalytic activities of PdCI₂ (reduced)＋PPh₃, PdCI₂(PPh₃)₂ and Pd(PPh₃)4 are very poor. The poisoning of catalyst by mercury indicates that the catalytically active species are composed of Pd(0) colloidal particles. Transmission electron micrographs show that the size of nanometric Pd(0)particles of PdCI₂ with PPh₃ added in situ is smaller than that of PhCl₂(PPh₃) or PdC₁₂(reduced)＋PPh₃. A synergic effect of bimetallic catalysts such as PdCI₂＋nPPh₃＋NiCl₂ (n=0.5, 1)and PdCl₂(PhCN)₂＋PPh₃＋FeCI₃ gives rise to a further increase in the catalytic activity.

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Polymerization of Methyl Methacrylate with Samarocene Complex Supported on Mesoporous Silica

Xu Feng NI, Zhi Quan SHEN, Hajime YASUDA

中国化学快报. 2001, 12(09): 821-822.

摘要 ( )

可视化

Samarocene complex was supported on a series of mesoporous silica with various pore sizes. Polymerization of methyl methacrylate (MMA) by these catalysts provide highly syndiotactic PMMAs with higher molecular weights compared with those obtained by solution polymerization with homogeneous catalyst system.

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Esterification of Glycerol by Oleic Acid and Selective Hydrogenation of Oieic Acid Methylester Over Acid and Ru-Sn-B Supported Mesoporous AIMCM-41

Qiu Bin KAN, J. BARRAULT, Tong Hao WU

中国化学快报. 2001, 12(09): 823-926.

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可视化

The AIMCM-41 molecular sieves with two different pore sizes arc hydrothermally synthesized in the presence of surfactants with two different chain lengths. H-AIMCM-41 and Ru-Sn-B/H-AIMCM-41 which are prepared by the conventional ion-exchange and incipient wetness techniques of the AIMCM-41 show tair catalytic activity for esterification of glycerol by oleic acid and selective hydrogenation of oleic acid methylester, respectively.

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Molecular Dynamics Simulation of Glass Transition Behavior of Polyimide Ensemble

Tai Ning LIANG, Xiang Yu ZHANG, Xiao Zhen YANG

中国化学快报. 2001, 12(09): 827-828.

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可视化

The effect of chromophores to the glass transition temperature of polyimide ensemble has been investigated by means of molecular dynamics simulation in conjunction with barrier analysis. Simulated Tg results indicated a good agreement with experimental value. This study showed the MD simulation could estimate the effect of chromophores to the Tg of polyimide ensemble conveniently and an estimation approach method had a surprising deviation of Tg from experiment. At the same time, a polyimide structure with higher barrier energy was designed and validated by MD simulation.

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Study on Phase Equilibrium Properties for CO₂＋Cosolvent Binary Systems

Zhang Jing CHANG, Wu Xiang YANG, Cao Wei LIANG

中国化学快报. 2001, 12(09): 829-832.

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可视化

In this study, the constant volume, visual method is used to measure thc critical point of CO₂toluene, CO₂＋cyclohexane, CO₂＋n-butyraldehyde, CO₂＋i-butyraldchyde, CO₂＋methanol and CO₂＋alcohol binary systems. The relationship between critical point and the concentration of the entrainer for different substances has been discussed, and the comparison of the phase behavior of single component system and that of binary systems have been carried out.

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Studies on NaXe Clusters

Jia Chang LIANG, Zhi LIU, Yi Min SHEN, Xian Ping SUN, Xi Zi ZENG, Xiao Yun LE, Xiang Yun WANG, De Min WANG, Fu Chun YU, Yong Ti CHEN

中国化学快报. 2001, 12(09): 833-834.

摘要 ( )

可视化

The chemical shift of ²³Na in excimer NaXe was measured by using nuclear magnetic resonance (NMR) spectra, which is in good agreement with the theoretical value obtained by ab initio calculations. The bond length, dissociation energy, dipole of NaXe and Mulliken charges at Na and Xe in NaXe were calculated, respectively. The spectra of ultraviolet (UV) fluorescence and surface-enhanced Raman scattering of NaXe were also measured.

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A Novel Zirconium-Based Perovskite-Type Membrane Material for Oxygen Permeation

Jian Hua TONG, Wei Shen YANG, Rui CAI, Bai Chun ZHU

中国化学快报. 2001, 12(09): 835-838.

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可视化

A novel zirconium-based membrane material of BaCo_0.4Fe_0.4Zr_0.2O_3-ä with cubic perovskite structure was synthesized for the first time through a method of citric and EDTA acid combined complexes. The structural stability was characterized by XRD, O₂-TPD and H₂-TPR techniques respectively. The high oxygen permeation flux of 0.873 mL/cm²·min at 950℃ was obtained under He/Air gradient. Meanwhile, the single activation energy for oxygen permeation and the long-term steady operation of 200 h at 800℃ were achieved.

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A Study on Production of Carbon Nanotubes by CH₄ Decomposition over LaNiO₃, La₄Ni₃O₁₀, La₃Ni₂O₇ and La₂NiO₄

He LI, Shui Hua TANG, Bao Chun LIU, Li Zhen GAO, Bai Ling LIU, Qi LIANG, Bo Lan ZHANG, Zuo Long YU

中国化学快报. 2001, 12(09): 839-842.

摘要 ( )

可视化

Carbon nanotubes (CNTs) of narrow size distribution can be abundantly produced in the catalytic decomposition of CH₄ over pre-reduced LaNiO₃, La₄Ni₃O₁₀, La₃Ni₂O₇ and La₂NiO₄.The CNTs obtained were characterized by means of transmission electron microscopy (TEM).Thermal oxidation of CNTs in air was monitored thermogravimetrically (TG). The resultsrevealed that a lower La/Ni ratio of the catalysts would lead to a wider diameter distribution and a higher degree of graphitic nature.

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Polyaniline Nanofibrils Array Synthesized within the Anodic Aluminum Oxide Template

Zhen WANG, Hu Lin LI

中国化学快报. 2001, 12(09): 843-846.

摘要 ( )

可视化

Polyaniline (PANI) nanofibrils were prepared within the anodic aluminum oxide (AAO)template. The surface appearance of PAN1 nanofibrils and the structure of nanofibril array were observed by scanning electron microscopy (SEM). The diameter and the length of PANI nanofibrils are dependent on the pore diameter and the thickness of AAO template. X-rayphotoelectron spectroscopy (XPS) supplies the surface analysis confidence on the PANI nanofibrils.Fourier Transmission Infrared (FTIR) was used to confirm the fibrils composed of PANI.

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2001年, 第12卷, 第09期　刊出日期：2001-09-20

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2001年, 第12卷, 第09期 刊出日期：2001-09-20

2001年, 第12卷, 第09期　刊出日期：2001-09-20