中国化学快报

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A New Compound with C2-Symmetry 3R,3'R-Dihydroxy-6,6',6,6'-tetramethyl-2R,2'R,-bis-4H-pyran

Li Bing Yu, Li XU, Zhi Qin WANG

中国化学快报. 1997, 8(08): 653-654.

摘要 ( )

可视化

The title compound 1 was synthesized from 1.2:5,6-dianhydro-3,4-isopropylidene-D-mannitol 2 through four steps in a total yield of 53%.The absolute configuration of this compound was confirmed by X-ray diffraction.

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The Cycloaddition Reaction of Lawesson's Reagent with 1,3-Dienes

Liang Nian HE, Ren Xi ZHUO

中国化学快报. 1997, 8(08): 655-656.

摘要 ( )

可视化

Lawesson's reagent undergoes [2+4] cycloaddition reaction with 2-methyl-1,3-butadiene,cyclopentadiene to yield heterocycles 4 and 5,respectively.

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A Novel Scission of Alkyl-Carbonyl C-C Bond by 3-Halogeno-4-Hydroxyacetophenines

Yu Guo JIAO, Pang ZHANG

中国化学快报. 1997, 8(08): 657-660.

摘要 ( )

可视化

The title scission was studied with the result that dimenzation of the scission products was observed,their structures were identified and modes of dimerization proposed.

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BrCo (dmgh) ₂Py/Zn Promoted Addition of BrCF₂CF₂CH=CHCH₂X to Alkynes:Direct Synthesis of 4,4,5,5-Tetrafluorocyclopentene Derivatives

Qiao Sheng HU, Chang Ming HU

中国化学快报. 1997, 8(08): 661-664.

摘要 ( )

可视化

BrCF₂CF₂CH=CHCH₂X(x=Cl,OAc,OH) reacted smoothly with alkynes in the presence of BrCo(dmgh)₂Py/Zn,giving 4,4,5,5-tetrafluorocyclopentene derivatives in moderate yields.

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Michael Addition of Nitroalkanes to CF₃CCl₂COCH=CHPh:A Facile Route to Fluorine-containing γ-Nitro Ketones

Qiao Sheng HU, Chang Ming HU

中国化学快报. 1997, 8(08): 665-668.

摘要 ( )

可视化

Nitroalkanes react smoothly with CF₃CCl₂COCH=CHPh via Michael addition in the presence of inorganic bases such as KF/Al₂O₃ or K₂CO₃,giving fluorine-containing γ-nitro ketones in good yields.

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Studies on the Sulfinatodehalogenation Pt.30:Synthesis of Trifluorovinyl Compounds

Qiao Sheng HU, Chang Ming HU, Wei Yuan HUANG

中国化学快报. 1997, 8(08): 669-672.

摘要 ( )

可视化

Trifluorovinyl compounds were obtained in good yields when BrCF₂CFClR were subjected to sulfinatodehalogenation conditions(Na₂S₂O₄/NaHCO₃).

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Synthesis of Ethyl 3-Fluoroalkyl-3-Halo Acrylate With CH₂N₂

Qiao Sheng HU, Chang Ming HU

中国化学快报. 1997, 8(08): 673-676.

摘要 ( )

可视化

When ethyl 3-fluoroalkyl-3-haloacrylate was treated with excess CH₂N₂,1-methyl-3-ethoxycarbonyl-4-fluoroalkylpyr-azoles(3) and 1-methyl-5-ethoxycarbonyl-4-fluoroalkylpyra-zoles(4) were obtained with a ratio of 90-95:10-5 in good yield.

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Low-valent Titanium Induced Reductive Coupling Reaction of Aryl Sulfonyl Chlorides with α,β-Unsaturated Esters

Da Qing SHI, Lai Long MU, Zai Sheng LU, Gui Yuan DAI

中国化学快报. 1997, 8(08): 677-678.

摘要 ( )

可视化

The reductive coupling reactions of aryl sulfonyl chloride induced by (TiCl₄-Zn) reagent affords diaryl disulfide.However,reaction of aryl sulfonyl chloride with α,β-unsaturated ester under the same condition affords β-arylsulfo ester.

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Enantioselective Reduction of Prochiral Ketones Catalyed by Oxazaborolidine Derived from L-Cystine

Xing Shu Li, Xiao Ling Zhang, Ru Gang Xie

中国化学快报. 1997, 8(08): 679-680.

摘要 ( )

可视化

Two new chiral oxazaborolidine derivated from L-cystine have been used to catalyze the enantioselective reduction of prochiral ketones and the secondary alcohols are obtained with good to excellent opitical yields.

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Synthesis of α-Selenoesters By Reactions of α-Bromoesters With Diselenides Promoted By Metallic Tin

Wei Xing QIAN, Wei Liang BAO, Yong Min ZHANG

中国化学快报. 1997, 8(08): 681-682.

摘要 ( )

可视化

α-Bromoesters can react with diselenides by metallic tin in THF to give α-selenoesters in moderate to good yields.

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A New Reagent for the Reduction of Aromatic Nitro Compounds

Jian Guo SHAO, Long Cheng WANG, Ming ZHENG, Qi ZHONG

中国化学快报. 1997, 8(08): 683-684.

摘要 ( )

可视化

Aromatic nitro compounds were reduced to the corresponding anilines by refluxing with potassium selenated borohydride (KBH₂Se₃) prepared from potassium borohydride and selenium in refluxed formamide.

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Synthesis of Sulfur Containing Calixcrown and Its Complexing Properties

Yan Song ZHENG, Zhi Tang RUANG

中国化学快报. 1997, 8(08): 685-688.

摘要 ( )

可视化

Sulfur containing calixcrown 1 and 2 are synthesized from bromoethoxycalix[4] arene 3,and their complexing properties are also studied.

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Studies on the Synthesis of Sesamin-Group Lignans Ⅷ. A Simplified Sythesis of 2-Aryl-4-phenyloxazoles and 2-Alkyl-4-phenyloxazoles

Xiao Ping NIE, Zhen Qiang WANG, Xiu Lin YE

中国化学快报. 1997, 8(08): 689-690.

摘要 ( )

可视化

The reaction of phenacyl benzoate derivatives with acetamide at about 140° in the presence of BF₃ catalyst gave 2-aryl-4-phenyloxazoles.This method can be applied to the preparation of 2-alkyl-4-phenyloxazoles as well.

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The Synthesis of Bridged Purine Dinucleoside

Xiao Hua XU, ZhiYuan SUN, Zhong Biao ZHANG, Guo Chen CHI, RuYu CHEN

中国化学快报. 1997, 8(08): 691-692.

摘要 ( )

可视化

Two bridged purine dinucleosides,bis (2-N-acetyl-6-N-alkylylene-2,6-diaminopurine-2',3',5'-triacetyl-β-D-ribofuranoside),were synthesized from the reaction of the key medium 3,2-acetylamino-6-[1-(1,2,4-triazolyl)]-purine-2',3',5'-triacetyl-β-D-ribofuranoside with dialkylamine.

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The Formal Stereoselective Synthesis of (+)-Preussin

Han-Qing DONG, Guo-Qiang LIN

中国化学快报. 1997, 8(08): 693-694.

摘要 ( )

可视化

The stereoselective synthesis of (+)-preussin has been achieved by utilizing the Sharpless asymmetric epoxidation of the divinylcarbinol (3) and the oxidative cyclization of 9 with PDC as the key steps.

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Total Synthesis of Saprorthoquinone

Wen Hu DUAN, Jun Chao CAI

中国化学快报. 1997, 8(08): 695-696.

摘要 ( )

可视化

Saprorthoquinone (1),isolated from the roots of salvia prionitis Hance,was synthesized starting from p-methoxyphenylacetic acid.

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Total Synthesis of (-)-Baimuxifuranic Acid

Yong Gang CHEN, Zhao Ming XIONG, Jiong YANG, Yu Lin LI

中国化学快报. 1997, 8(08): 697-700.

摘要 ( )

可视化

The first total synthesis of (-)-baimuxifuranic acid (1) starting from (-)-carvone has been described.In our studies a surprising allylic oxidation was found in the oxidation of α,β-unsaturated aldehyde 5 with silver oxide.

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Total Synthesis of Bilobetin and Isoginkgetin

Xue Shi MAO, Shi Ping XU, Xiao Tian LIANG

中国化学快报. 1997, 8(08): 701-704.

摘要 ( )

可视化

Total synthesis of bilobetin and isoginkgetin has been achieved by Pd(PPh₃)₄ catalytic coupling of 8-fiavone-boronic acids with iodoflavones.

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Three New diterpenoids from Isodon Gesneroides

Shao Nong CHEN, Hong Jie ZHANG, Zhong Wen LIN, Yao Zu CHEN, Han Dong SUN

中国化学快报. 1997, 8(08): 705-706.

摘要 ( )

可视化

Three new diterpenoids,gesneroidins D-F (1-3),were isolated from Isodon gesneroides.The structure was determined as 3β,7β,11β,15β-tetraacetoxy-ent-kaur-16-en-6-one;15β-hydroxy-1 α,3β,6α,7β,11β-pentaacetoxy-ent-kaur-16-ene;6α,11β-dibydroxy-3β,7β-diacetoxy-ent-kaur-16-en-15-one based on 1D and 2D NMR techniques (COSY,NOESY,HXTCOR,COLOC).

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Structure Studies on Host-Guest Recognition Sensory Systems

Lin Jing YANG, Xi Zeng FENG, Imshik LEE, Chun Li BAI

中国化学快报. 1997, 8(08): 707-710.

摘要 ( )

可视化

Rhodamine B-ethylenediamine-β-cyclodextrins (RhB-β-CDen) and rhodamine B-β-cyclodextrins (RhB-β-CD) form inclusion complexes with many guest molecules,which can be used as nucleic acid probe.In this paper we determined the most stable conformations of RhB-β-CDen and RhB-β-CD by molecular mechanics and dynamics simulation.The interaction between RhB-β-CDen and two guest molecules,1-borneol and cyclohexanol,have been investigated both theoretically and experimentally.The results show that the interaction between borneol and RhB-β-CDen is stronger than that between cyclohexanol and RhB-β-CDen.

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ESR Study on the Photooxidation Mechanism of Near-Infrared Absorbing Benzothiazolone Cyanine Dye

Jun LI, Ping CHEN, Jiang ZHAO, De Shui ZHENG, Tsuneki Okasaki, Masaaki Hayami

中国化学快报. 1997, 8(08): 711-714.

摘要 ( )

可视化

In this paper,the direct photooxidation mechanism of near-infrared absorbing benzothiazolone cyanine dye has been studied by VIS absorption spectroscopy and Electron Spin Resonance (ESR).The technique of spin trapping has been successfully applied to the detection of the photoinduced formation of singlet oxygen (¹O₂) and superoxide (O₂^-).It was reveled that the singlet oxygen and superoxide anion all contributed to the photofading of cyanine dye.

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Studies on the Electrochemical Reduction of Cyanocobinamide

Dong Hong ZHENG, Tian Hong LU, Hui Lan CHEN

中国化学快报. 1997, 8(08): 715-718.

摘要 ( )

可视化

It was found that cyanocobinamide (CN-Cbi) can be reduced at about-0.50V.The reduction process has an EC mechanism,i.e.the electrochemical reduction of CN-Cbi is accompanied by a decyanation of CN-Cbi.The electrochemical characteristics of CN-Cbi and vitamin B₁₂ were compared.

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Fluorescence Quenching and Depolarization Studies on Segmental Motion of Poly (N, N-dimethylacrylamide)

Chang Ying ZHU, Shi Hua Wu, Lian Rong LI

中国化学快报. 1997, 8(08): 719-720.

摘要 ( )

可视化

A new polymer,poly (N,N-dimethylacrylamide),labeled with acenaphthylene has been synthesized.The rotational relaxation time of this polymer has been studied using steady state fluorescence depolarization measurement in combination with fluorescence quenching measurement.

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Photoelectrochemical Behaviours of Tandem Semiconductive Electrode

Dian Lu JIANG, Zhi Hui HAN, Yun Hong SONG, Qing Fei WANG, Ru Ting TONG, Guochang Li

中国化学快报. 1997, 8(08): 721-724.

摘要 ( )

可视化

The photoelectrochemical behaviour of the multilayer semiconductive electrode (GaAs/Al_xGa_1-xAs)with the structure of N⁺NP and N⁺NPP was studied in Na₂SO₄ solution.Compared with single kind semiconductor electrode,the commposite one has broader photoresponse spectral region and larger open-circuit photovoltage,consequently gives higher solar energy conversion efficiency.

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Polymerization of Bisphenol A Epoxy Resin with Polyethylene glycol

Zhen Zhong YANG, De Lu ZHAO, Mao XU

中国化学快报. 1997, 8(08): 725-728.

摘要 ( )

可视化

The catalyst boron trifluoride etherate was used to catalyze the reaction of epoxy resin with polyethylene glycol (PEG),and the effect of the concentration of the catalyst on the reaction is studied.It is shown that there exist two competitive reactions:I,self polymerization of epoxy resin via chain growth and Ⅱ,copolymerization of epoxy resin with PEG via step growth.At high concentration of the catalyst,reaction I dominates and reaction Ⅱ is negligible.On the contrary,at low concentration of the catalyst,reaction Ⅱ dominates and block copolymers are formed.In the intermediate case,the two reactions are comparable with the result that a gel structure is obtained.

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Inner-Sphere Reorganization Eneregy For Metal Ion-Benzene Complex in Electron-Transfer Process

Jian XU, Zheng Yu ZHOU, Yan He GUO

中国化学快报. 1997, 8(08): 729-732.

摘要 ( )

可视化

Based on the capture force field potential model and the adiabatic invariant proposed by Bates,adopting improved average dipole orientation (IADO) theory,the force constants between transition metal ions and benzene (bz) and also a series of inner-sphere reoganization energy (RE_in) were calculated.The reasons for the differences between theoretical predictions and experimental results were discussed.

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Ab Initio Study of NH₃-CH₃OH Neutral and Ionic Clusters

Yue LI, Xiang Hong LIU, Xiao Guang ZHANG, Xiu Yan WANG, Nan Quan LOU

中国化学快报. 1997, 8(08): 733-736.

摘要 ( )

可视化

NH₃-CH₃OH system was studied by ab initio calculations at the Hartree-Fock level using the 6-31G^* basis set.Equilibrium geometries of both of its ionic (type Ⅰ and Ⅱ) and neutral clusters are obtained.Different dissociation channels are evaluated for Ⅰ and Ⅱ,respectively.The results suggest that when NH₃-CH₃OH is vertically ionized,CH₃O+NH₄⁺ are the dominant products via a proton transfer reaction,and accompanying the dissociation of (NH₃-CH₃OH)_ver⁺ to NH₃⁺+CH₃OH,intracluster charge transfer process takes place in the system.

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Ab Initio Theoretical Prediction on Structures of Boron Cationic Cluster B₁₇⁺

Xu-Guang HU, Yu-Min CAI, Qian-Shu LI

中国化学快报. 1997, 8(08): 737-740.

摘要 ( )

可视化

Four isomers of the three-dimensionally connected bare boron cationic cluster B₁₇⁺ were investigated by using ab initio molecular orbital theory at the HF/6-31G level.The results show that the D_5h symmetric isomer of B₁₇⁺ is a possible isomer candidate of its stable geometries with closed structure.

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Investigation on Molecular and Crystal Structures of Metal Complexes with Aminopolycarboxylic Acids (Ⅰ)——Synthesis and Structure of Na₂ [Fe^Ⅲ (ida)2]2·3H₂O

Jun WANG, Wei Qun ZHANG, Xi Ming SONG, Xiang Dong ZHANG, Yan XING, Yong Hua LIN, Heng Qing JIA, Lei ZHANG

中国化学快报. 1997, 8(08): 741-744.

摘要 ( )

可视化

The crystal structure of the title complex salt has been determined by single-crystal X-ray structure analysis.The crystal data are as follows;Monoclinic,P2_1/c,a=15.6480 (10)Å,b=16.7870 (10)Å,c=10.347 (2)Å,β=90.790 (10),V=2717.7 (6)Å³,Z=3,and R=0.0333 for 4789 unique reflections.The complex anion has a pseudo-octahedral structure distorted more than the Cr^Ⅲ and Co^Ⅲ analogs,in which cach iminodiacetato ligand (ida^2-) is coordinated in a facial fashion with the two N atoms in a cis configuration,resulting in an unsym-fac structure.

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Preparation and Application of Polymyxin B Affinity Membrane Cartridge

Wei GUO, Zhen Hua SHANG, Yi Nian Yu, Liang Mo ZHOU, Kang ZHOU

中国化学快报. 1997, 8(08): 745-746.

摘要 ( )

可视化

Affinity membrane was used for the endotoxin adsorption.The matrix macropore membrane was prepared from filterpaper by chemically crosslinking,and polymyxin B was immobilized as affinity ligand.The prepared membrane cartridge can be used for the removal of endotoxin from aqueous solutions.With a cartridge of 40 sheets affinity membrane containing,the endotoxin level of the processed solution can be reduced to a minimum of 4 pg/mL.

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1997年, 第8卷, 第08期　刊出日期：1997-08-20

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1997年, 第8卷, 第08期 刊出日期：1997-08-20

1997年, 第8卷, 第08期　刊出日期：1997-08-20