中国化学快报

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Deprotection of t-Butyldimethylsiloxy(TBDMS)Protecting Group with Catalytic Copper (Ⅱ) Chloride Dihydrate

Zhong Ping TAN, Lin WANG, Jian Bo WANG

中国化学快报. 2000, 11(09): 753-756.

摘要 ( )

可视化

t-Butyldimethylsilyl (TBDMS) ether can be cleaved upon refluxing in acetone/H₂O (95:5) in the presence of catalytic amount of copper (Ⅱ) chloride dihydrate (5 mmol%).

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Synthesis of Symmetric Diketones from Imidazolinium Salt and Bis-Grignard Reagents

Zhen SHI, Lin Gang LU

中国化学快报. 2000, 11(09): 757-760.

摘要 ( )

可视化

The reaction of 2-substituted imidazolinium salt with bis-Grignard reagents is reported and a new method for the synthesis of symmetric diketones from carboxylic acids and bis-Grignard reagents is provided.

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Thiazolidine Derivatives as Chiral Catalysts in the Enantioselective Addition of Diethylzinc to Benzaldehyde

Qing Lin MENG, Yue Lan LI, Yan HE, Ye Di GUAN

中国化学快报. 2000, 11(09): 761-764.

摘要 ( )

可视化

Four types of chiral thiazolidine derivatives were synthesized conveniently from natural L-cysteine and showed good enantioselectivity in up to 90% ee in the addition of diethylzinc to benzaldehyde.Their enantioselectivity was affected by the bulkiness of R and the thiazolidine ring systems in their molecules.

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A Facile Synthesis Route to 1,3-dichlorodisilazanes

Cai Hong XU, Ning ZHOU, Ze Min XIE

中国化学快报. 2000, 11(09): 765-766.

摘要 ( )

可视化

A new 1,3-dichlorodisilazane, 1,3-dichloro-1,3-dimethyl-1,3-divinyldisilazane (DMDV), was prepared from the reaction of hexamethyldisilazane (MM^N) and methylvinyldichlorosilane. And use the same method, 1,3-dichloro-1, 1,3, 3-tetraphenyldisilazane (DCTPS) was also obtained in a high yield.

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Synthesis and Cation-Mediated Electron Transfer in Fluorescence Quenching of Donor-Acceptor Podands

Hua JIANG, Hui Jun XU

中国化学快报. 2000, 11(09): 767-770.

摘要 ( )

可视化

Reduced rate constants of photoinduced electron transfer in intramolecular fluorescence quenching of donor-acceptor podands induced by cation-complexation are observed in the highly exothermic reactions.

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Synthesis of Peptoid Nucleic Acid with Thymine as Nucleic Base

Yun WU, Jie Cheng XU

中国化学快报. 2000, 11(09): 771-774.

摘要 ( )

可视化

The synthesis of peptoid nucleic acid bearing thymine as nucleobase has been achieved.This modified oligonucleotide showed good hybridization with DNA.

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A New Approach to [60] Fullerene Ferrocenyl Derivative

Yuan Yin CHEN, Xin Hong LI

中国化学快报. 2000, 11(09): 775-776.

摘要 ( )

可视化

A new approach to fullerene ferrocenyl derivative has been made.[60]Fullerene reacts with ferrocenylmethyl azide to give N-ferrocenylmethyl imino[60]fullerene in 42% yield.

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Synthesis and Characterization of Poly (Aryl Ether Ketone) Containing Phthalazinone and Naphthalene Moieties

Ye GAO, Xi Gao JIAN, Jin Yan WANG

中国化学快报. 2000, 11(09): 777-778.

摘要 ( )

可视化

A novel poly (aryl ether ketone) (PPEK) containing phthalazinone and naphthalene moieties was prepared by the nucleophilic displacement reaction of 4-(4-hydroxyphenyl) (2H) phthalazin-l-one with 1-chloro-4-(4-chlorobenzoyl) naphthalene.The polymer was characterized by FTIR, ¹H-NMR, DSC, TGA and WAXD.

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Harpagometabolins I and II,Two New Metabolites from Harpagoside by Human Intestinal Bacteria

Xiu Wei YANG, Chen Ting ZOU, Masao HATTORI

中国化学快报. 2000, 11(09): 779-782.

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可视化

Harpagoside, which is one main iridoid constituent of the dried roots of Scrophularia ningpoensis Hemsl., was biotransformated by bacteria isolated from human fecal flora and three metabolites were obtained.The structures of the metabolites, including two new alkaloids, named harpagometabolins I (1) and Ⅱ (2), and a known alkaloid acubinine B (3), were identified by chemical methods and the spectroscopic evidences.

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A New Ceramide from the Soft Coral Cladiella humesi Verseveldt

Ming Yan WANG, Yi LUO, Jing Yu SU

中国化学快报. 2000, 11(09): 783-784.

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可视化

A new ceramide, humesamide, was isolated from the soft coral Cladiella humesi Verseveldt, which was collected from Linshui County of Hainan Province.Its structure was established by spectroscopic analysis and chemical degradation methods.

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Two Polyoxygenated Pyrrolylpyridine and Bipyrrole Alkaloids from Speranskia tuberculata

Jian Gong SHI, Wen Yan HU, Guang Xiong ZHOU, Yong Chun YANG, Han Qing WANG, Min WANG

中国化学快报. 2000, 11(09): 785-788.

摘要 ( )

可视化

Two novel polyoxygenated pyrrolylpyridine and bipyrrole alkaloids, speranskilatine A 1, and speranberculatine A 2, have been isolated from Speranskia tuberculata.Their structures were elucidated by spectroscopic methods including 2D NMR techniques and X-ray crystallographic analysis.

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Spiramide,a New Diterpene Amide from the Roots of Spiraea japonica var.acuta

Yue Mao SHEN, Hong Ping HE, Yong Sheng ZHANG, Bin Gui WANG, Xiao Jiang HAO

中国化学快报. 2000, 11(09): 789-792.

摘要 ( )

可视化

Chemical investigation on the neutral fraction of the ethanol extract from the roots of Spiraea japonica var.acuta has resulted in the isolation of one new diterpene amide, spiramide (1). Structure elucidation for 1 was carried out on the basis of 1D and 2D NMR spectra.

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A New Enolate Furostanoside from Asparagus Filicinus

Xiao Dong CONG, Wen Cai YE, Chun Tao CHE

中国化学快报. 2000, 11(09): 793-794.

摘要 ( )

可视化

A new enolate derivative of furostanol glycoside, named asparagusin A, was isolated from the roots of Asparagus filicinus and established as 3-O-β-D-xylopyranosyl (1→4)-β-D-glucopyranosyl (25S)-furost-20 (22)-ene-3β, 26-diol 26-O-β-D-glucopyranoside (1) by spectroscopic and chemical methods.Asparagusin A (1) exhibited a cytotoxic activity effect on PC₁₂ cells.

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Two New ent-Kaurane Diterpenoids from Isodon xerophilus

Ai Jun HOU, Hui YANG, Bei JIANG, Qin Shi ZHAO, Yan Ze LIU, Zhong Wen LIN, Han Dong SUN

中国化学快报. 2000, 11(09): 795-798.

摘要 ( )

可视化

Two new ent-kaurane diterpenoids, xerophilusin E (1) and xerophilusin F (2), were isolated from the leaves of Isodon xerophilus.Their structures were determined as 3, 20:7, 20 diepoxy-ent-kaur-16-en-15-one and 7β, 14β, 20 (R)-trihydroxy-11β-acetoxy-7, 20-cyclo-ent-kaur-16-en-6, 15-dione, respectively, by spectral methods and X-ray crystallographic analysis.

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Purification of RhlFN-in Bacteria Bodies with Acetic Acid-Water as Mobile Phase in RPLC

Ye Hua SHEN, Qi Dong ZHANG, Xin Du GENG, Zhi Qing ZHANG, Yun De HOU

中国化学快报. 2000, 11(09): 799-802.

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可视化

The extract of E.coli containing recombinant human intcrferon-(rhIFN-) with 7.0 mol/L guanidine hydrochloride (Gu·HCl) was directly injeeted into a column of reverse phase liquid chromatography (RPLC) to scparatc and purify rhIFN-with acetic acid-water as mobile phase. Gu·HCl and most impure proteins can be scparatcd by this way.Compared with the usual dilution method, the bioactivity recovery of the purified rhIFN-was found to be over 500%.In addition, compared to common organic solvents cmploycd in RPLC, acetic acid has higher freezing point, and therefore, it is easy to concentrate the aim-irotcin by frcczc-drying when acetic acid-water is used as mobile phase in RPLC.

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Key Conditions in Capillary Electrophoresis of Amino Acids with Indirect Ultraviolet Detection

Zhi Xin WANG, Yi CHEN, Qing GUO

中国化学快报. 2000, 11(09): 803-806.

摘要 ( )

可视化

Key factors for capillary electrophoresis of amino acids with indirect ultraviolet detection were investigated.Buffer compositions and additives were found to be influential as expected, while buffer PH was shown to be particularly critical to the separation and detection. The effect of pH also depended on the electrophoretic mode used.Ways to obtain recurring and selective separations were suggested.

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The Simultaneous Determination of Cu Pb Cd and Sb by Derivative Adsorption Chronopotentiometry

Xiao Li ZHANG, Shu Ying PAN

中国化学快报. 2000, 11(09): 807-808.

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可视化

The behaviour of the complexes of copper, lead, cadmium and antimony with salicylfluorone (SAF) adsorbed on HMDE has been investigated by derivative chrono potentiometry in NH₃/NH₄Cl.The dependence of the peak height on the dt/dE vs E curve on preconcentration time, the pH of solution and the constant reducing current are discussed.This method achieved the simultaneous determination of copper, lead, cadmium and antimony in human hair.

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A Study on a Partially Immersed Gold Electrode Using an Electrochemical Quartz Crystal Impedance System

Qing Ji XIE, You Yu ZHANG, Ming SUN, Ling YI, Shou Zhuo YAO

中国化学快报. 2000, 11(09): 809-812.

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可视化

The electrochemical quartz crystal impedance system (EQCIS) has been used for the study of a partially immersed Au electrode in 0.2 mol/L NaClO₄ aqueous solution.The influences of the immersed area and height of the electrode on the EQCIS responses were evaluated, showing the highest response sensitivity to liquid loading at the center of the piezoelectric quartz crystal electrode.The increase in the immersed height of the Au electrode at oxygen reduction potentials during potential cycling was measured by this technique.

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A Dye-sensitized Nanocrystalline Solid State Photovoltaic Cell

Dong She ZHANG, Xu Rui XIAO

中国化学快报. 2000, 11(09): 813-814.

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可视化

A new type of dye-sensitized nanocrystalline solid state photovoltaic cell based on the wide band gap n-TiO₂/p-Cul heterojunction was fabricated.Tetra-carboxyphenyl porphyrine (TPP-(COOH)₄), squarylium cyanine derivative (SQ-(CH₂)₃^-SO₃Py⁺) and ruthenium bipyridyl complex (RuL₂ (NCS)₂) were used as photosensitizers.Larger photocurrents and photovoltages were shown in the cell sensitized by ruthenium bipyridyl complex and can be further increased by intercalation of a TiO₂ thin underlayer.

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Measurement of Monomer Reactivity Ratios of D,L-3-Methylglycolide with Glycolide or D,L-Lactide

Chang Ming DONG, Kun Yuan QIU, Zhong Wei GU, Xin De FENG

中国化学快报. 2000, 11(09): 815-818.

摘要 ( )

可视化

For monomer reactivity ratios study, the copolymerization of D, L-3-methylglycolide (MG) with glycolide (GA) or D,L-lactide (LA) was carried out in bulk to a certain low conversion in the presence of stannous octoate at 140℃.The copolymer compositions were determined by ¹H NMR spectroscopy.The monomer reactivity ratios were evaluated by Fineman-Ross method, Kelen-Tüdös method and linear least-squares method.The monomer reactivity ratios of D,L-3-methylglycolide and glycolide or D,L-lactide are r_mg=0.73, r_ga=1.47; r_mg=1.71, r_la=0.92, respectively.

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Novel Covalently Linked Self-Assembled Films from a Functional Hyperbranched Conjugated Poly (Phenylene Vinylene)

Jin ZHAI, Feng Lian BAI, Qing Guo HE, Ying Shun LI, Lei JIANG, Tong LIN

中国化学快报. 2000, 11(09): 819-822.

摘要 ( )

可视化

A new self-assembled films of a functional dendritic molecule, hyperbranched conjugated poly (phenylene vinylene), is obtained through covalent bond linkage.The highly ordered and homogenous molecular films are obtained and characterized by UV-vis spectra, fluorescent spectra and atomic force microscopy.

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Enhancement of Solubility of Troeger's Base in Supercritical Carbon Dioxide by Methanol

Qi Long REN, Mci HUANG, Bao Gen SU, Ping Dong WU

中国化学快报. 2000, 11(09): 823-826.

摘要 ( )

可视化

The solubility of Troeger's base (TB) in SC-CO₂/CH₃OH was measured at 308K in the pressure range of 8 to 13 MPa, and methanol concentration ranges from 0 to 20 mol%.The sohubility increases dranmatically with methanol concentration.Comparison of solubility in supcrcritical CO₂ with and without 10 mol% CH₃OH in the prcssure of 8 MPa at 308K implies that both curves are steep in the lowcr pressure range but become smooth as the pressure increases.

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Oxidative Methylation of Toluene with Methane over Basic Zeolite Catalysts Promoted with Alkali Metal Bromides and Alkali Metal Oxides

Ling Ping ZHOU, Wei LI, Ke Yi TAO, Xuan Wen LI, He Xuan LI

中国化学快报. 2000, 11(09): 827-830.

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可视化

The catalytic effects for the oxidative methylation of toluene with methane over the basic zeolite catalysts prepared by promoting KY, KX, KM, KZSM-5 or Kβ with alkali-metal bromides and alkali-metal oxides have been investigated comparatively.The alkali-metal bromides promoted substrates are more effective than the alkali-metal oxides promoted systems.Moreover, the NaBr promoted systems are more active than KBr promoted systems.The most effective catalytic system (8wt%NaBr)/KZSM-5 gave a toluene conversion as high as 76.3% and a total C₈ selectivity of 76.4% (styrene/ethylbenzene=9.76) resulting in a total C₈ yield of 58.3%.

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Novel Properties of Supramolecular Complexes Formed by Pairing Cationic Porphyrin and Anionic Metal-Oxo Cluster

Shu Qing LIU, Ji Qing XU, Hao Ran SUN

中国化学快报. 2000, 11(09): 831-834.

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可视化

MTBPyP (meso-tetrakis (4-N-benzylpyridyl) porphyrin, M=H₂, Zn) bearing positive charge has been shown to associate with SiW₁₂O₄₀^4- in water solution.The spectral evolution and Job's plots analyses reveal that the relatively stable aggregates contain equal numbers of MTBPyP⁴⁺ and SiW₁₂O₄₀^4-.

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The Novel Benzo-15-Crown-5 with Palladium(II) Complex:[Na(B15C5)]₂[Pd(SCN)₄]

Lan Ying ZHU, Jian Min DOU, Ying LIU, De Zhi SUN, Pei Ju ZHENG, Chen Xia DU, Yu ZHU

中国化学快报. 2000, 11(09): 835-838.

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可视化

A novel Pd (Ⅱ) Benzo-15-crown-5 complex[Na (B15C5)]₂[Pd (SCN)₄] has been isolated and characterized by IR and X-ray diffraction analysis.The crystal structure belongs to monoclinic, space group P2₁/n with cell dimensions, a=1.0164 (6), b=1.3743 (3), c=1.4987 (7) nm, β=95.248 (6)°, V=2.0847nm³, Z=2, F (000)=944, R=0.053, Rw=0.072.The compound consists of two[Na (B15C5)]⁺ complex cations and a [Pd (SCN)₄]^2- complex anion.Each sodium ion is coordinated by five crown ether oxygen atoms and one N atom from the SCN group of[Pd (SCN)₄]^2- to form stable neutral complex.

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An Encapsulation of the Rare Earth Complex in Modified Mesoporous Molecular Sieve MCM-41

Qing Hong XU, Lian She FU, Lian Sheng LI, Hong Jie ZHANG, Qing Quo MENG, Ru Ren XU

中国化学快报. 2000, 11(09): 839-842.

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可视化

The encapsulation of a rare earth (RE) complex Eu (DBM)₃phen in modified Si-MCM-41 with 3-aminopropyltriethoxysilane is reported for the first time.The luminescence intensity of the RE complex in the modified Si-MCM-41 is about 9 times as strong as in unmodified Si-MCM-41 and the luminescence of the RE complex in the modified Si-MCM-41 has good color purity.

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Preparation of CaS:Eu²⁺ Phosphor by Microwave Heating Method and its Luminescence

Peng Jun LIU, Ying Liang LIU

中国化学快报. 2000, 11(09): 843-846.

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可视化

This is the first report of using the microwave heating technique to synthesize calcium sulphide activated by europium whose structure is determined as the face-centered cubic by conventional X-ray powder diffraction method.The phosphor has maximum excitation peaks located at 280 nm and 560 nm and the maximum emission of the phosphor is 630 nm.When the concentration of Eu²⁺ in CaS increases from 1.0×10^-5 to 1.0×10^-2 mole per mole host, the body colour of the calcium sulphide activated with europium changes from white, through light-red to pink to deep-red.The phosphor obtains the longest afterglow at the concentration of 0.1% Eu²⁺-doped and is a kind of good material excited by sunlight.

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2000年, 第11卷, 第09期　刊出日期：2000-09-20

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2000年, 第11卷, 第09期 刊出日期：2000-09-20

2000年, 第11卷, 第09期　刊出日期：2000-09-20