中国化学快报

Select

Elimination Reaction of α, ω-Diols by Magnesium

Ji Mao LIN, Hui ZHANG, Ai You HAO, Qin Zheng YANG

中国化学快报. 1998, 9(08): 697-698.

摘要 ( )

可视化

1,3-Propanediol, 1,4-butanediol or 1,5-pentanediol reacts with magnesium to form corresponding magnesium alkoxides, which eliminate water with the formation of cyclic ethers and, respectively, allyl alcohol, 3-buten-l-ol and 4-penten-l-ol.

Select

Conjugate Addition Reactions of Functionalized Organozinc-copper Reagents to α, β-Unsaturated Esters

Yu Lai HU, Jian Hua YU, Shi Yan YANG, Yuan Qi YIN, Tian Quan JIAO, Jin Xian WANG

中国化学快报. 1998, 9(08): 699-700.

摘要 ( )

可视化

Functionalized organozic reagents can easily conduct 1,4-addition reaction with unsaturated esters in the persence of Cu(OAc)₂ and LiCI under very mild conditions to give the products in excellent yields.

Select

Application of Fast Radical Rearrangement in the Mechanistic Investigation of Intramolecular C-H Insertion by Rh(Ⅱ)-Mediated Carbenoids

Jian Bo WANG, Feng Ting LIANG

中国化学快报. 1998, 9(08): 701-704.

摘要 ( )

可视化

In order to investigate the reaction mechanism of intramolecular C-H insertion by Rh(Ⅱ)-mediated carbenoids with rrans-(2-phenylcyclopropyl)carbinal radical as the mechanistic probe, diazo compounds 2-(2-phenylcyclopropyl)ethyl diazoacetoacetate 8a and methyl 2-diazo-3-oxo-6-(2-phenylcyclopropyl)hexanoate 8b have been synthesized. Preliminary investigation of the intramolecular C-H insertion with Rh₂(OAc)₄ as catalyst supports a concerted insertion process.

Select

A Novel Example of Hetero Diels-Alder Reaction

Yan ZHANG, Yun Zhen JIANG, Xiao Tian LIANG

中国化学快报. 1998, 9(08): 705-706.

摘要 ( )

可视化

2, 3, 3a, 4, 5, 9b-hexahydro-8-(N-methylsulfamylmethyl)-4-phenylfuro[3, 2-c]quinoline was obtained when the alkylation of compound 1 was carried out with THF as solvent. The structure of the product was determined and the mechanism of the reaction was studied and proved by the imitation reaction.

Select

Photosynthesis of Tetrahydroprotoberberines with Electron withdrawing Groups on Ring D

Yong Zhou HU, Qi Ting ZHOU, Dong Lu BAI

中国化学快报. 1998, 9(08): 707-710.

摘要 ( )

可视化

A number of tetrahydroprotoberberines with electron-withdrawing groups on ring D have been synthesized via photocyclization of 2-formyl-1 -benzylideneisoquinoline enamides as the key step.

Select

Synthesis of Alkyl 4(4'-octyloxy-4"-biphenylcarboxy)-benzenesulfonates

Zhi Ping LI, Guo Du REN

中国化学快报. 1998, 9(08): 711-713.

摘要 ( )

可视化

Five new Liquid Crystals with sulfonate units were synthesized. And they were determined by FT-IR and MS. The points of phase transition and the temperature ranges of liquid crystals were measured by means of DSC and PLM (Polarized Light Microscopy).

Select

A Convenient Method for the Stereoselective Synthesis of 7α-Hydroxycholesterol

Ling Jie GAO, Tian Zeng ZHAO, Guang Dian HAN

中国化学快报. 1998, 9(08): 715-716.

摘要 ( )

可视化

7α-Hydroxycholesterol was prepared from cholesteryl acetate via allylic bromination followed by hydroxylation in 73% overall yield.

Select

First Total Synthesis of (-)-4-0-(6'-hydroxy-7'(9')-dehydro-6',7'-dihydrogeranyl)-coniferyl Alcohol

Zuo Sheng LIU, Chu Sheng HUANG, Jiong LAN, Yu Lin LI

中国化学快报. 1998, 9(08): 717-720.

摘要 ( )

可视化

The reduction of 2,3-epoxy alcohol, prepared from the Sharpless asymmetric epoxidation, with the system of Ph₃P, iodine, imidazole, 2,6-lutidine and water in Et₂0/CH₃CN, gives a chiral secondary allylic alcohol in 94% yield and 92% e.e.. Using this reaction as the key step, we synthesized (-)-coniferyl alcohol derivative 1 starting from the geraniol through nine steps in an overall yield of 39%.

Select

Synthesis and Herbicidal Activity of 2-Benzoyliminopyrimido[3,2-b]-1 2,4-Thiadiazolines

Si Jia XUE, Dong Yun TAN, Chang You SUN

中国化学快报. 1998, 9(08): 721-722.

摘要 ( )

可视化

A series of 2-benzoyliminopyrimido[3,2-b]-1,2,4-thiadiazolines were synthesized and tested for herbicidal effects. All of them are new compounds and their structures were confirmed by ¹HNMR, IR, MS. The preliminary herbicidal tests show that some of the target compounds have potent activity and very good selectivity to rice.

Select

Bioisosterism between Sulfonyl Group and Phosphoryl Group-The Synthesis of New ALS Inhibitors N-(Arylamino Hydroxyl Phosphoryl)-N'-(4,6-Dimethoxypyrimidine-2-yl)ureas

Guo Feng ZHAO, Hua Zheng YANG, Lin Xiu WANG, Yong Hong LI

中国化学快报. 1998, 9(08): 723-725.

摘要 ( )

可视化

In view of the isosterism of sulfonyl group (-SO₂-) and phosphoryl group [-P(0)(0R)-, R=H, CH₃, C₂H₅, etc], a new type of ureas, that is, N-phosphoryl-N'-(4,6-dimethoxypyrimidin-2-yl) ureas 2 were synthesized and shown to be a new class of acetolactate synthase (ALS) inhibitors.

Select

The Synthesis of Cyclotriphosphazene Liquid Crystals

Yong Gang YANG, Jian Xun WEN

中国化学快报. 1998, 9(08): 727-729.

摘要 ( )

可视化

Four functional cyclotriphosphazene liquid crystals have been synthesized. Their phase transition temperatures have also been measured by polarizing textural observation and confirming by DSC.

Select

Catalytic Hydrolysis of Lipophilic Amino Acid Esters by Metallomicelles as Carboxypeptidase A Models

Xiao Qi YU, Jing Song YOU, Qing Xiang XIANG, Qian Shun YAN, Ru Gang XIE

中国化学快报. 1998, 9(08): 731-732.

摘要 ( )

可视化

Lipophilic complexes of macrocyclic 12-membered dioxotetraamine ligand bearing bis-hydroxy groups as functional pendants are effective catalysts for the hydrolysis of amino acid es- ters in micellar media, and the rate enhancement of more than 10-fold were observed.

Select

A New 1β-hydroxy-ent-kaurenoid From Isodon Enanderianus

Yan Hong WANG, Yao Zu CHEN, Zhong Wen LIN, Han Dong SUN

中国化学快报. 1998, 9(08): 733-734.

摘要 ( )

可视化

A new 1 p-hydroxy-ent-kauren diterpenoid, enanderianin C 1, has been isolated from the leaves of Isodoti enanderianus, and its structure has been elucidated by spectroscopic evidences.

Select

Oligostilbentes from Vitis DavidⅡ

Wen Wu LI, Bo Gang LI, Yao Zu CHEN

中国化学快报. 1998, 9(08): 735-736.

摘要 ( )

可视化

A novel tetrastilbene, davidol A, was isolated from the stems of Vitis davidii together with the previously known resveratrol, (+)-ε-viniferin; ampelopsin C; ampelopsin E; vitisin A and hopeaphenol. Its structure was elucidated mainly by ID and 2D NMR analyses.

Select

A New Triterpenoid from Teucrium Integrifolium

Xing Liang CHEN, Tian En WANG, Bei JIANG, Zhong Wen LIN, Han Dong SUN

中国化学快报. 1998, 9(08): 737-738.

摘要 ( )

可视化

A new ursane-type triterpene, 3β-hydroxy-urs-5(6)-en-28-oic acid 1, was isolated from the aerial parts of Teucrium integrifolium and characterized. The structure of this new compound was mainly established by 2D NMR techniques (COSY, HETCOR, HMBC).

Select

A New Pregnane Glycoside from Dioscorea collettii var. hypoglauca

Ke HU, Ai Jun DONG, Hisayoshi KOBAYASHI, Shigeo IWASAKI, Xin Sheng YAO

中国化学快报. 1998, 9(08): 739-742.

摘要 ( )

可视化

A new pregnane glycoside hypoglaucin G was isolated from Dioscorea collettii var. hypoglauca by bioactivity-guided fractionation, which showed a moderate activity of inducing morphological deformation of the Pyricularia oryzae mycelia. The structure of hypoglaucin G was established as 16β-(4'-methyl-5'-0-β-D-glucopyranosyl-pentanoyloxy)-pregn-5-en-3β-ol-20-one-3-0-α-L-rhamnopyranosyl-(1→2)-[α-L-rhamnopyranosyl-(1→4)-]-β-D-glucopyranoside by che- mical evidence and spectral analysis, especially by 2D-NMR techniques.

Select

Chemiluminescence flow Sensor for determination of the Ammonium ion

Bao Xin LI, Wei QIN, Zhu Jun ZHANG

中国化学快报. 1998, 9(08): 743-745.

摘要 ( )

可视化

A novel chemiluminescence (CL) sensor for NH₄⁺ combined with flow injection analysis is presented in this paper. It is based on the inhibition effect of NH₄⁺ on the CL reaction between luminol, immobilized electrostatically on an anion-exchange column, and hypochlorous acid electrogenerated on-line. The sensor responds linearly to NH₄⁺ concentration in 1.0×lO^-6-4.0×10^-9 g/ml range. A complete analysis could be performed in 1 min. The system is stable for 200 determination

Select

The Electrochemical Behavior and the Determinationof Bavistin on Glassy Carbon Electrode

Yuan Zhe PIAO, Gui Fen WANG

中国化学快报. 1998, 9(08): 747-748.

摘要 ( )

可视化

In this paper, the electrochemical behavior of bavistin (MBC) on glassy carbon electrode is reported. In a base solution of pH=9.0 NH3-NH₄CI, a sensitive anodic peak was found by cyclic voltammetry. Differential pulse stripping voltammetry was applied for determining MBC in grains. The detection limit is 4×lO^-8mol/L.The recovery is from 91.3% to 95.7%. The method has advantages of simplicity and high sensitivity.

Select

Study on Conductivity Detection for Capillary Electrophoresis--Design of a new type of miniature conductance cell

Wen Feng LIU, Jin Yuan MO, Bing Yi YANG

中国化学快报. 1998, 9(08): 749-751.

摘要 ( )

可视化

A new kind of miniature conductance cell with thick electrodes was made, which has high resolution, high sensitivity, but no dead volume. A set of capillary electrophoresis device with on-column conductivity detector was assembled. In order to test the performance of this kind of mini-cell, different kinds of mini-cells were used to detect Li⁺, Na⁺, K⁺, Ca²⁺and Mg²⁺ ions.

Select

A Study of Multi-order Semidifferential Oscillographic Chronopotentiometry

Jian Bin ZHENG, Min GAO, Ye Wei FU, Hong GAO

中国化学快报. 1998, 9(08): 753-756.

摘要 ( )

可视化

By applying the convolution technique to the treatment of oscillographic signal, a new electroanalytical method, 0.5-3.5 order differential A.C. oscillographic chronopotentiometry is presented. This note represents the experimental circuits, principle and characteristics of the method.

Select

A New Amperometric Detector Cell for Capillary Zone Electrophoresis

Xiao Yun YANG, JinYuan MO, TianYao XIE, Bing Yi YANG, Wen Feng LIU, Pei Xiang CAI

中国化学快报. 1998, 9(08): 757-760.

摘要 ( )

可视化

A simple and convenient electrochemical detection cell for capillary electrophoresis is described in this paper. In this cell, alignment of the capillary working electrode with the separation capillary outlet can be achieved precisely and easily without the aid of the micropositioner or microscope. With end-column detection, the applicability of the cell as an amperometric detector for capillary electrophoresis is demonstrated by running several phenolic compounds in 50μim i.d. capillary with a capillary Pt electrode as the working electrode. Results obtained are satisfactory.

Select

Intensity Exaggeration of Endohedral Metallofullerenes in Laser Desorption-Ionization Time-of-Flight Mass Spectrometry

Da Yong SUN, Wen Guo XU, and Shu Ying LIU

中国化学快报. 1998, 9(08): 761-764.

摘要 ( )

可视化

The laser-desorption-ionization time-of-flight mass spectrometry and desorption-electron-ionization mass spectrometry were employed for the characterization of metallofullerenes extract. It was found that the relative intensities of metallofullerenes in this positive-ion, negative-ion LD-TOF MS and DEI MS were much different. This phenomenon should have relationship with the peculiar ionization energies and electron affinities of metallofullerenes.

Select

⁹⁹Ru and ¹³C-NMR Spectra for the Tris Chelates of 5-Substituted 1,10- Phenanthrolines with Ruthenium(Ⅱ)

Xiao Ming XIAO, Takeko MATSUMURA-INO UE

中国化学快报. 1998, 9(08): 765-766.

摘要 ( )

可视化

¹³C and ⁹⁹Ru-NMR chemical shifts are reported for the ruthenium(Ⅱ) tris complexes of 5-substituted 1,10-phenanthrolines. It has been found that both of them are affected by the substituents on the phenanthrolines in a direction consistent with that expected from the electron withdrawing ability of the substituent.

Select

Study on the C₆₀-Caged States of H₂ and N₂

Li Jin XU, Chuan Bao ZHU, Ji Min YAN

中国化学快报. 1998, 9(08): 767-770.

摘要 ( )

可视化

The states of small molecule H₂ and N₂ in the C₆₀ cage have been studied. It is shown that the molecular stable configurations of the caged states exhibits little change compared with the free states, but the bond intensities of the caged states have become much stronger.

Select

A Detailed Dynamics Study of the Reaction CH₄+Cl→HCl+CH3

Li Jin XU, Xue Bin WANG, Ji Min YAN, Fan Ao KONG

中国化学快报. 1998, 9(08): 771-774.

摘要 ( )

可视化

The detailed dynamics of the CH₄+CI→HC1+CH₃ reaction has been investigated by means of the quasiclassical trajectory approach. The properties analyzed can be interpreted in terms of the main topological features of the potential energy surface used. On the basis of the theoretical results, two reaction channels are proposed: one is a direct channel and the other is a complex one.

Select

Microwave Effect On Partial Oxidation of Methane to Syngas over Ni/ZrO2

Xian Jun BI, Xiao Guang XIE, Ai Hong DUAN, Pin Jie HONG, Shu Shan DAI

中国化学快报. 1998, 9(08): 775-777.

摘要 ( )

可视化

The partial oxidation of methane to syngas over Ni/ZrO₂ catalyst irradiated by microwave has been studied. Compared with a conventional heating mode, the temperature of the catalytic bed is much lower and there is a higher selectivity of CO and H₂ with microwave irradiation.

Select

Molecular Dynamics Studies of Collapse Stages in the chain folding process of Polyethylene

Qi LIAO, Xi Gao JIN

中国化学快报. 1998, 9(08): 779-782.

摘要 ( )

可视化

Molecular dynamics simulations of model polyethylene chains with various lengths up to 4000 CH₂ units were performed. Our results verified that the modification of force fields to demonstrate the collapse stages in the folding process is not necessary. The transition between the stages of chain folding became sharp, and the clusters became stable as the chain became longer.

Select

Synthesis and Structural Characterization of Adduct [La(NO3)₃·4H2O]·2(BQEB)

Wen Xiang ZHU, Bao Di GOU, Yong An ZHANG, Yan LI, Xue An CHEN

中国化学快报. 1998, 9(08): 783-784.

摘要 ( )

可视化

A new podand compound o-Bis(8'-quinolyloxy) ethylenoxyl benzene (BQEB) was prepared. A lanthanum adduct with BQEB was synthesized and its structure was characterized by X-ray crystal analysis. The La(Ⅲ) is ten-coordinated to the three N0₃⁺ and four H₂0. Two podand molecules are linked to the coordination core by four hydrogen bonds. The crystal is packed in the manner of.LLMLLMLL.

Select

Synthesis and Characterization of Chiral Binuclear Organolanthanide and Yttrium Alkoxides Containing Cyclopentudienyl Ligand

Chang Tao QIAN, Tai Sheng HUANG

中国化学快报. 1998, 9(08): 785-787.

摘要 ( )

可视化

Three new chiral binuclear organolanthanide alkoxides containing cyclopentadienyl ligand have been synthesised by the reaction of Cp₃Ln (Cp=C₅H₅; Ln=Yb, Y, Dy) with 0.5 equimolar chiral diol in THF (tetrahydrofuran) at -78℃ at room temperature. All the complexes were characterized by elemental analysis, IR and MS spectra.

Select

Mechanism of Dealumination of NaY Zeolite with Oxalic Acid

Hui LIU, Xing Yun LIU, Xuan Wen LI, Xiao Jie XU

中国化学快报. 1998, 9(08): 789-790.

摘要 ( )

可视化

Dealuminated Y zeolite with high crystallinity is obtained from NaY zeolite by treatment with oxalic acid in a buffering system. The effect of dealumination conditions on the degree of dealumination and the crystallinity of the reformed zeolite is discussed. A mechanism for the reaction is proposed.

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

1998年, 第9卷, 第08期　刊出日期：1998-08-20

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

1998年, 第9卷, 第08期 刊出日期：1998-08-20

1998年, 第9卷, 第08期　刊出日期：1998-08-20