中国化学快报

Select

A Rapid and Convenient Synthesis of Acylals from Aldehydes and Acetic Anhydrides Catalyzed by SnCl₄/SiO₂

Yi Qun LI, Li Hui CHENG

中国化学快报. 2001, 12(07): 565-568.

摘要 ( )

可视化

A variety of aldehydes were converted into acylals in excellent ields with acetic anhydride in the presence of a catalytic amount of tin (Ⅳ) chloride supported on silica gel at room temperature.

Select

Synthesis of a New β-Mercaptoalcohol

Jian Feng GE, Li Fen ZHANG, Zong Xuan SHEN, Ya Wen ZHANG

中国化学快报. 2001, 12(07): 569-570.

摘要 ( )

可视化

In this letter, (R)-1,1-diphenyl-2-mercapto-3-methyl-1-butanol was synthesized from L-valinc and two synthetic routes have been tried.

Select

Synthesis of Optical Active 2-Arylpropionic Acids

Bo WANG, Hong Zhu MA, Qi Zhen SHI

中国化学快报. 2001, 12(07): 571-574.

摘要 ( )

可视化

(S)-2-(6'-methoxyl-α-naphthyl) propionic acid ((S)-Naproxen, ee 99%) has been prepared starting from (6-methoxyl-α-naphthyl)propan-1-one and D-sorbitol under SmCl₃catalysis.

Select

Stereoselective Synthesis of N¹-Lyxitol Inosine Derivative

Li Jun HUANG, Yan PANG, Ji Mei MIN, Li He ZHANG

中国化学快报. 2001, 12(07): 575-578.

摘要 ( )

可视化

1,4-anhydro-2-triflyl-3,5-O-benzenylidene-L-xylitol (5) was constructed in six steps from protected D-xylose. Substitution of 5 with protected 8-bromoinosine 6 gave the key intermediate 5'-O-TBS-2',3'-di-O-acetyl-N¹-(2"-deoxy-1",4"-anhydro-3",5"-O-benzenylidene-Llyxitol-2"-yl)-8-bromoinosine (14). Selective removal of 5'-O-TBS-group gave the corresponding 5'-O-phosphorodianilidate 4 though phosphorylation, which was characterized by X-ray crystallographic analysis.

Select

An Improved Synthesis of trans-3, 3b, 4, 9b, 10, 11-Hexahydro-6-methoxy-9b-methyl-7-(1-methylethyl) phenanthro {1,2-c[furan-1,5-dione]}

Xue Qiang YIN, Guang Zhong YANG, Yuan Chao LI

中国化学快报. 2001, 12(07): 579-580.

摘要 ( )

可视化

trans-3, 3b, 4, 9b, 10, ll-Hexahydro-6-methoxy-9b-methyl-7-(l-methylethyl) phenanthro {1,2-c[furan-l,5-dione]} was synthesized with good yield in two steps from triptophenolide methyl ether under mild conditions.

Select

Facial Selectivity in the Nucleophilic Additions of endo-Tricyclo [5.2.1.O^2.6]deca-2 (6),8-dien-3-one

Xue Shi MAO, A. A. VOLKERS, A. J. H. KLUNDER, Binne ZWANENBURG

中国化学快报. 2001, 12(07): 581-584.

摘要 ( )

可视化

Nucleophilic additions to endo-tricyclo [5.2.1.0^2.6]deca-2(6),8-dien-3-one 4 are described.Experimental results show high preference for exo-facial attack to the enone moiety of tricyclodecadienone. Steric hindrance is the main kinetically controlling factor in the nucleophilic reaction. The shielding effect and the stabilizing effect of the norbornene double bond favor the exo-facial attack also.

Select

Study on Nucleophilic Additions to endo-tricyclo [5.2.1.O^2.6]deca-2 (6),8-dien-3-one and an Unusual Payne Rearrangementof α, β-Epoxy Tricyclodecenone

Xue Shi MAO, A. A. VOLKERS, A. J. H. KLUNDER, Binne ZWANENBURG

中国化学快报. 2001, 12(07): 585-588.

摘要 ( )

可视化

Synthesis of highly strained tetracyclic ketones was achieved by cyclopropanation or epoxidation of tricyclodecenone 1. An unusual formation of α-methoxy β-hydroxy ketone from an α,β-unsaturated enone system via Payne rearrangement was reported.

Select

Study on the Synthesis and Biodegradation of Aliphatic Polyester

Chang Ying ZHU, Xiao Di KOU, Zhi Qiang ZHANG, Ying Cai YOU, Diao Hu Xin

中国化学快报. 2001, 12(07): 589-592.

摘要 ( )

可视化

An aliphatic polyester, poly(hexalene adipate) (PHA) and an aliphatic copolyester, poly (hexalene adipate succinate) (PHAS) were synthesized by direct condensation of corresponding binary acid and binary alcohol in the presence of a catalyst, p-toluene sulfonic acid. The biodegradation of these polyesters were studied in the laboratory by enzyme attack and outdoor soil burial. The results show that these polyesters have good biodegradability and the copolyester PHAS, even displayed a better biodegradability than the polyester PHA. In the presence of Penicillium chrysogenum the weight loss reached 18.3% for the PHAS (film thickness 1.0 mm)and 9.1% for the PHA (film thickness 1.0 mm) after 28 days. Outdoor soil burial tests indicate that these polyesters also have good biodegradability in natural conditions. The weight loss reached 14.2% for PHAS (film thickness 0.1 mm) and 6.7% for PHA (film thickness 0.1mm) after burying in soil for 36 days.

Select

Synthesis and Characterization of Poly (ether imide)s Containing Phthalazinone and Isopropyl Moieties

Jin Yan WANG, Xi Gao JIAN, Shu De XIAO

中国化学快报. 2001, 12(07): 593-594.

摘要 ( )

可视化

A novel poly (ether imide)s containing phthalazinone and isopropyl moieties derived from 2-(4-aminophenyl)-4-[4-(4-aminophenoxy) phenyl]-phthalazin-l-one and bisphenol-A diphthalic anhydride was synthesized by one-step solution condensation polymerization in m-cresol. The polymer was characterized by FTIR, NMR, molecular weights, glass transition temperature,thermal degradation temperature and WAXD.

Select

Synthesis of Dendritic-Linear Block Copolymers by Atom Transfer Radical Polymerization

You Liang ZHAO, Ai Jun GONG, Jing JIANG, Hong Wei LIU, Chuan Fu CHEN, Fu XI

中国化学快报. 2001, 12(07): 595-596.

摘要 ( )

可视化

The dendritic polyarylether 2-bromoisobutyrate as the macromolecular initiator for the controlled free radical polymerization of styrene was investigated. The polymerization was carried out with CuBr/2,2'-bipyridine catalyst at 110℃. It is found that the hybrid dendritic-linear block copolymers possess well-defined molecular weights and low polydispersities.

Select

A New Eudesmanolide and a New Aromatic Derivative from Carpesium cernuun

Chao YANG, Qi Xiu ZHU, Wei YONG, Zhong Jian JIA

中国化学快报. 2001, 12(07): 598-600.

摘要 ( )

可视化

A new eudesmanolide and a new aromatic derivative were isolated from the roots of Carpesium cernuun. Their structures were elucidated as 13-hydroxy-5,7(11)-eudesmadien-12,8-olide and 3-methyl-8-acetoxy-9,10-diisobutyryloxy-p-cymene by spectral methods (EIMS, FAB-MS, 1D and 2D NMR).

Select

Two New Eremophilane Sesquiterpenes from Cacalia ainsliaeflora

Man Jun MAO, Zhong Jian JIA

中国化学快报. 2001, 12(07): 601-602.

摘要 ( )

可视化

Two new eremophilane sesquiterpenes 33-angeloyloxy-8α-hydroxy-6β-methoxy eremophil-7 (11), 9 (10)-dien-8, 12-olide (1) and 3β-angeloyloxy-6β, 8α-dihydroxy-eremophi-7(11), 9 (10)-dien-8, 12-olide (2) were isolated from Cacalia ainsliaeflora. Their structures were established by spectroscopic methods and 2D NMR experiments.

Select

Three New Coumarins from Micromelum integerrimum

Hong Ping HE, Yun ZOU, Yue Mao SHEN, Xiao Yan HAO, Guo Yin ZUO, Xiao Jiang HAO

中国化学快报. 2001, 12(07): 603-606.

摘要 ( )

可视化

Three derivatives of micromelin, named hydramicromelins A-C (1-3), were isolated from the aerial part of Micromelum integerrimum (Buch.-Ham) Roem., respectively.Hydramicromelins A-C (1-3) were epimers which possessed the same plane structure and molecular formula. Their structures were elucidated based on MS and NMR data. The relative configurations of 1-3 were established by NOE analysis.

Select

Leiocyclocin A and B, Two Cyclopeptides from Goniothalamus leiocarpus

Qing MU, Rong Wei TENG, Chao Ming LI, De Zu WANG, Yu WU, Han Dong SUN, Chang Qi HU

中国化学快报. 2001, 12(07): 607-610.

摘要 ( )

可视化

Two new cyclopeptides, leiocyclocin A (1), B (2), were isolated from the seeds of Goniothalamus leiocarpus. Their structures were elucidated by means of spectral and chemical methods.

Select

Gnetupendin C, a New Stilbene Dimer from the Lianas of Gnetum Pendulum

Xiao Mei LI, Ying Hong WANG, Mao LIN

中国化学快报. 2001, 12(07): 611-612.

摘要 ( )

可视化

Gnetupendin C, a new dimer coupled by a resveratrol and an oxyresveratrol unit, was isolated from the lianas of Gnetum pendulum C.Y. Cheng (Gnetaceae). Its structure was established on the basis of spectroscopic evidence, especially 2D techniques.

Select

A New Spirostanol Saponin from Dioscorea futshauensis

Hong Wei LIU, Hisayoshi KOBAYASHI, Ge Xia QU, Xin Sheng YAO

中国化学快报. 2001, 12(07): 613-616.

摘要 ( )

可视化

A new spirostanol saponin presenting strong activity of inducing morphological deformation of Pyricularia oryzae mycelia was isolated from Dioscorea futshauensis R. Kunth by bioactivity-guided fractionation. The structure was established as (25S)-spirost-5-en-3β,27-diol-3-O-[α-L-rhamnopyranosyl (1→2)-β-D -glucopyranosyl (l→3)]-β-D-glucopyranoside on the basis of chemical evidences and spectral analysis, especially by 2D-NMR techniques.

Select

A New Benzosesquiterpenoid Dimer from Polyalthia cheliensis Hu

Wei Ming ZHU, Xin HONG, Yue Mao SHEN, Bi Tao ZHAO, Hong Ping HE, Xiao Jiang HAO

中国化学快报. 2001, 12(07): 617-618.

摘要 ( )

可视化

A new benzosesquiterpenoid dimer, 3",3"'-bispolycerasoidol (1), along with its monomer, polycerasoidol, were isolated from the dried leaves of Polyalthia cheliensis Hu. The structure of 1 was established by spectroscopic methods.

Select

Intercalation of Epinephrine with Calf-thymus ds-DNA

Sai Jing ZHENG Xiang Qin LIN

中国化学快报. 2001, 12(07): 619-622.

摘要 ( )

可视化

A strong interaction between double stranded calf-thymus DNA (ds-DNA) and epinephrine but no interaction between single stranded calf-thymus DNA (ss-DNA) and epinephrine were observed by the use of UV-spectroscopy and cyclic voltammetry. It is suggested that the interaction leads to an intercalation of EP molecules into the groove of ds-DNA and the formation of ds-DNA(EP)_n complex.

Select

Study of Oxidation of Glutathione Treated with Hypochlorous Acid by Capillary Electrophoresis

Xian LUO, Jian De LU, Xiao Yun FU

中国化学快报. 2001, 12(07): 623-624.

摘要 ( )

可视化

Capillary electrophoresis (CE) method was developed for the separation and quantification of reduced glutathione (GSH), oxidized glutathione (GSSG) and glutathione sulphonic acid (GSO₃H). Baseline separation was obtained within five minutes. The effects of reaction time and molar ratio of hypochlorous acid (HOCI) to GSH on the oxidation of GSH were investigated.

Select

A Hydrogen Peroxide Biosensor Combined HRP Doped Polypyrrole with Ferrocene Modified Sol-gel Derived Composite Carbon Electrode

Fa Ming TIAN, Bo XU, Guo Yi ZHU

中国化学快报. 2001, 12(07): 625-728.

摘要 ( )

可视化

A novel amperometric biosensor for the detection of hydrogen peroxide is described.The biosensor was constructed by electrodepositing HRP/PPy membrane on the surface of ferrocenecarboxylic acid mediated sol-gel derived composite carbon electrode. The biosensor gives response to hydrogen peroxide in a few seconds with detection limit of 5×l0^-7 mol · L^-1 (based on signal:noise=3). Linear range is up to 0.2 mmol · L^-1.

Select

Direct Electrochemistry of Hemoglobin in Layer-by-layer {PDDA/Hb}_n Films Assembled on Pyrolytic Graphite Electrodes

Ping Li HE, Nai Fei HU

中国化学快报. 2001, 12(07): 629-630.

摘要 ( )

可视化

Layer-by-layer {PDDA/Hb}_n films were assembled by means of alternate adsorption of positively charged poly (diallyldimethyl ammonium) (PDDA) and negatively charged hemoglobin (Hb) at pH 9.2 from their aqueous solutions on pyrolytic graphite (PG) electrodes. Film growth during adsorption cycles was demonstrated by cyclic voltammetry and UV-Vis spectroscopy.Direct electrochemistry of Hb in {PDDA/Hb}_n films on PG was studied.

Select

Spectrophotometric Determination of Trace Chromium (Ⅵ)in Mass Chromium (Ⅲ)

Zi Gang XU, Xian Hong WEN, Qing Zhou WU

中国化学快报. 2001, 12(07): 631-634.

摘要 ( )

可视化

The method for the sepration and determination of trace Cr(VI) exiting in mass Cr(Ⅲ) has been researched. The method is highly sensitive and less interference, but is simple and useful for analysis trace Cr(VI).

Select

Two-photon Pumped Up-conversion Lasing Properties of A Series of Organic Salts with Different Side-chains

Yu Peng TIAN, Fu Ying HAO, Jie Ying WU, Qi FANG, Min Hua JIANG

中国化学快报. 2001, 12(07): 631-634.

摘要 ( )

可视化

The synthesis and upconverted fluorescent properties of a series of organic compounds with the structure:donor/bridge/acceptor, and different side-chains are reported. The results show that the compounds with different side-chains exhibit different two-photon induced fluorescent properties, although they have the same main donor/bridge/acceptor structure.

Select

Theoretical Studies on the Conformation of mono-6-O-p-nitrobenzoyl-β-cyclodextrin in Aqueous Solution

Yong FENG, Hai Ming ZHANG, Lei LIU, Yong Hui WANG, Zhao Xiong LIANG, Qing Xiang GUO

中国化学快报. 2001, 12(07): 637-640.

摘要 ( )

可视化

The conformation of mono-6-O-p-nitrobenzoyl-β-cyclodextrin was studied with B3LYP/6-311g^**//PM3 calculations in vacuum and in water solution. It was concluded that the p-nitrobenzoyl group of the molecule should be located above the primary hydroxyls of the cyclodextrin instead of being completely enclosed by the cavity. It was proposed that the behavior might be caused by the requirement of a cis ester bond in the self-included conformation of the molecule.

Select

Kinetic Model of Hypophosphite Oxidation on a Nickel Electrode in D₂O Solution

Yue ZENG, Hui Xian WANG, Shang Ci YU, Xin De WU, Xue Qiang CAO

中国化学快报. 2001, 12(07): 641-644.

摘要 ( )

可视化

Kinetic model of hypophosphite oxidation on a nickel electrode was studied in D₂Osolution in order to reach a better understanding of the oxidation mechanism. In the model the electrooxidation of hypophosphite undergo a H abstraction of hypophosphite from the P-H bond to form the phosphorus-centered radical PHO₂^-, which subsequently is electrochemically reacted with water to form the final product, phosphite. The kinetic equations were derived, and the kinetic parameters were obtained from a comparison of experimental results and the kinetic equations. The process of hypophosphite electrooxidation could be well simulated by this model

Select

Study of the Electrical Double Layer of a Spherical Micelle:Functional Theoretical Approach

Zheng Wu WANG, Gan Zuo LI, Da Ren GUAN, Xi Zhang YI, An Jing LOU

中国化学快报. 2001, 12(07): 645-646.

摘要 ( )

可视化

By using the iterative method in functional theory, an analytic expression of the Poisson-Boltzmann equation (PB eq.), which describes the distribution of the potential of electrical double layer of a spherical micelle, has been carried out under the general potential condition for the first time. The method also can give the radius, the surface potential, and the thickness of the layer.

Select

Influence of Geometric Structure of Immobilized Aluminium Chloride Catalyst on Catalytic Property in Isobutene Polymerization

Tian Xi CAI, Min HE, Xian Zhe SHI, Xin Ping WANG

中国化学快报. 2001, 12(07): 647-650.

摘要 ( )

可视化

The catalytic property of AlCl₃ catalyst immobilized on γ-Al₂O₃ for isobutene polymerization has been studied. It was found that the activity, selectivity and stability of the catalyst are dependent greatly on geometric characteristic of the pore structure and size of catalyst.Although the activity and selectivity of the catalysts with micro-and meso-pore structure are all high in initial stage, but their stability is low, while those with bimodal meso-and macro-pore structure are excellent. Increasing granularity of the catalyst (particle become fine) brings about an increase in isobutene conversion, but a decrease in selectivity, resulting in lower average molecular weight and its broader distribution.

Select

Synthesis, Characterization and Luminescence of Lanthanide Chloride Complexes with N,N,N',N'-Tetra [(2-benzimidazolyl) methyl]-l,2-Ethanediamine

Ming Jie ZHANG, Ling HUANG, Xiu Fang SHI, De Qing GAO, Song Lin LI, Gui Mei CAI, Yan Yi HUANG, Guang Qing YAO, Jing LI

中国化学快报. 2001, 12(07): 651-654.

摘要 ( )

可视化

N,N,N',N'-tetra [(2-benzimidazolyl) methyl]-l,2-ethanediamine (EDTB) lanthanidechloride complexes were prepared (Ln³⁺=Eu³⁺, Tb³⁺or Gd³⁺). The results of single crystal X-ray structural analysis show that [(EDTB) GdCl₂]Cl(C₂H₅OH)(H₂O)₂ crystal is in space group P2₁/c with a=8.848(2) Å, b=26.313(5) Å, c=18.929(4) Å, β=97.82 (3)°, V=4366(2) Å3, Z=4. The luminescent properties of the terbium and europium complexes have been studied.

Select

The Nature of Bonding in WC and WN

Xue Mei GAO, Shi Xi LIU, Xiao Guang XIE, Huai CAO, Shu Shan DAI

中国化学快报. 2001, 12(07): 655-658.

摘要 ( )

可视化

The nature of bonding in the title compounds has been studied by using CASSCF and FOCl techniques. The ground states of WC and WN are found to be ³Δ and ⁴∑^- state arising primarily from:...1σ2σ21π⁴1δ¹3σ¹ and...1σ²σ²1π⁴1δ²3σ¹ configuration respectively. WC shows a strong character of covalent bond while WN have obvious character of ionic bond and the dissociation energy of WN is larger than that of WC (6.15 and 5.41 eV respective).

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

2001年, 第12卷, 第07期　刊出日期：2001-07-20

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

2001年, 第12卷, 第07期 刊出日期：2001-07-20

2001年, 第12卷, 第07期　刊出日期：2001-07-20