中国化学快报

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Determination of Constituents in Hair Dyes by Reversed-phase High-Performance Liquid Chromatography

Bao Hai SHAO, Jian Wei YAN, Xiu Zhu XU, Xiao Yun FU

中国化学快报. 2000, 11(06): 471-472.

摘要 ( )

可视化

A reversed-phase high-performance liquid chromatographic method for the separation and quantitation of 1,4-phenylenediamine, 4-aminophenol, 3-aminophenol, 1,3-benzendiol and 2,6-phenylenediamine in hair dyes was developed. The separation was carried out on a μ-Bondapak C₁₈ column with methanol-water containing 0.1% triethylamine and 0.02 mol/L NH₄Ac (pH=5.20) (10:90, vol./vol.) as the mobile phase. Two real samples were analyzed.

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Reduction of Diaryldiselenides by System of Cp₂TiCl₂/BuⁱMgBr/THF and Its Application in Synthesis of Unsymmetrical Diaryl Selenides

Xin Hua XU, Xian HUANG

中国化学快报. 2000, 11(06): 473-474.

摘要 ( )

可视化

Reduction of diaryldiselenides by the system of Cp₂TiCl₂/BuⁱMgBr/THF gave the nucleophilic arylselenium complex. They reacted with diaryl iodonium salts to afford unsymmetrical diaryl selenides in high yields.

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Study on Unexpected Cycloaddition Reactions of Imines with THF

Jun ZHAO, Ping XIE, Shu Feng CHEN, Xiao Tian LIANG

中国化学快报. 2000, 11(06): 475-478.

摘要 ( )

可视化

An unexpected tricyclic compound 2,3,3a,4,5,9b-hexahydrophenylfuro[3,2-c] quinoline 4 and its aromatized product 6 were obtained when the cycloaddtion of imine 1 and substituted norbornene 2 was carried out in THF with a catalytic amount of boron trifluoride. The structures of the products were determined by spectral data, and the mechanism of reaction was substantiated by the imitation reaction.

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Photoinduced One-Electron Reduction of 1,4-Dihydroxyanthraquinone

Zhi Cheng XU, Jing Yi AN, Yi Zhen HU, Fei TIAN

中国化学快报. 2000, 11(06): 479-482.

摘要 ( )

可视化

The photoinduced one-electron reduction of 1,4-dihydroxyanthraquinone(1,4-DHAQ) was studied by fluorescence, absorption and ESR spectroscopics.

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Michael Additions of Activated Methylene Compounds to α,β-Unsaturated Esters Promoted by Samarium (Ⅲ) Iodide

Xiao Yuan CHEN, Wei Liang BAO, Yong Min ZHANG

中国化学快报. 2000, 11(06): 483-484.

摘要 ( )

可视化

Promoted by SmI₃, β-diketones, β-ketoesters and α-cyano esters were added to α,β-unsaturated esters to form δ-carbonyl esters in mild conditions in moderate to good yields.

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Functioned Calix[4]arenes as Artificial Enzymes Catalyze Aldol Condensation

Li LIU, Zu Xing YANG, Yu Liang WANG, Shu Hua CHEN

中国化学快报. 2000, 11(06): 485-488.

摘要 ( )

可视化

Aldolase models derived from calix[4]arene were designed and synthesized. The aldol condensation of p-nitrobenzaldehyde with acetone was catalyzed by the synthetic enzymes proceeded under mild conditions to offer chiefly aldol-type product in good yield.

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The Chemical Reactions of 11-Hydroxycephalotaxine

Chuan Pin ZOU, Ke Mei WU, Liang HUANG

中国化学快报. 2000, 11(06): 489-492.

摘要 ( )

可视化

Some of the chemical reactions of 11-hydroxycephalotaxine 1, which were encountered during the derivation of 1 and the related compounds were reported.

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Synthesis of β-Cyclodextrin Bonded Metal Porphyrins

Zao Ying LI, Cong LI, Xu Ye WU, Yue Ning ZHANG

中国化学快报. 2000, 11(06): 493-494.

摘要 ( )

可视化

6-Deoxy-6-iodo-β-cyclodextrin (1) reacted with 5-(p-aminophenyl)-10,15,20-triphenyl porphyrin(2), 5-(p-aminophenyl)-10,15,20-triphenyl nickel(Ⅱ) porphyrin[Ni^ⅡTPP_NH2P] (3), 5-(p-aminophenyl)-10,15,20-triphenyl manganese(Ⅲ) porphyrin[Mn^ⅢTPP_NH2P] (4) and 5-(p-aminophenyl)-10,15,20-triphenyl carbonyl ruthenium porphyrin[Ru^Ⅱ(CO)TPP_NH2P] (5) to generate the compounds 6-9, respectively. Those new compound 5-9 have been identified by ¹H NMR, IR, MS and UV-visible spectra and elemental analysis.

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Facile Synthesis of Amidines via Intermolecular Reductive Coupling of Nitriles with Azobenzene Promoted by Samarium Diiodide

Zhi Fang LI, Ping LU, Yong Min ZHANG

中国化学快报. 2000, 11(06): 495-498.

摘要 ( )

可视化

The intermolecular reductive coupling of nitriles with azobenzene induced by SmI₂ was studied. Amidine derivatives were prepared in good yields under neutral and mild conditions.

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Synthesis and Properties of New-type Troponoid Dithio-Crown Ethers

Li Jun TANG, Long Yi JIN, Bing Zhu YIN

中国化学快报. 2000, 11(06): 499-502.

摘要 ( )

可视化

Condensation of 3,7-dichloromethyl-5-isopropyl-2-methoxytropone 4 with bis (mer-captoethyl) ether 5a and mono, di, and tri-ethylene glycol bis(mercaptoethyl) ethers 5b-5d gave troponoid-annexed dithiocrown ethers 6a-6d. Compounds 6a-6d have selective and reversible mercury salt capturing ability.

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Study on Synthesis of Heterocycle-Fused Troponoid Compounds

Wen Tao GAO, Zhuo ZHENG

中国化学快报. 2000, 11(06): 503-504.

摘要 ( )

可视化

3-Acetyltropolone 1 reacted with 3,4,5-trimethoxybenzaldehyde et al. to afford 2~5. 2-Acetyl-7-methylaminotropone 7 reacted with 3,4,5-trimethoxybenzaldehyde et al. to gave 8~10. Compound 1 reacted with 3,4,5-trimethoxybenzaldehyde in the presence of ethyl orthoformate and perchloric acid to afford 6. Compounds 3,5 reacted with hydroxylamine to give 11, 12. The reactions of 3,5 with phenylhydrazine gave 13, 14.

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Stereoselective Synthesis and Anticancer Activities of New Podophyllotoxin Derivatives:4-β-Cyano-4-Deoxy-4'-Demethylepipodophyllotoxin and 4-β-Carboxyl-4-Deoxy-4'-Demethylepipodophyllotoxin

Zai Xin CHEN, Wei Yong MA, Chun Nian ZHANG

中国化学快报. 2000, 11(06): 505-508.

摘要 ( )

可视化

4-β-Cyano-4-deoxy-4'-demethylepipodophyllotoxin 4 was synthesized from 4'-de-methylepipodophyllotoxin and Me₃SiCN in the presence of BF₃·Et₂O. 4-β-Carboxyl-4-deoxy-4'-demethylepipodophyllotoxin 5 was obtained by hydrolyzing 4 in HOAc. Both of them show very high anticancer activities against L₁₂₁₀ and KB cell lines in vitro.

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Synthetic Studies of Didemnaketals Analogue-Construction of the Intermediate (3S,5S,6R)-3,7-Dimethyl-5,6,7-trihydroxy-octanal

Yan Xing JIA, Bin WU, Ping Zhen WANG, Yong Qiang TU

中国化学快报. 2000, 11(06): 509-510.

摘要 ( )

可视化

An efficient and stereoselective synthetic procedure for (3S,5S,6R)-3,7-dimethyl-5,6,7-trihydroxy-octanal derivative, the intermediate for synthetic of the HIV-active didemnaketals analogue, was developed via a series of reactions from the natural (+)-Pulegone. In this approach, an efficient diastereoselective reaction of the epoxides 8 and 9 with PCC has been accomplished.

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Synthesis of a New Polysiloxane Containing Octaphenylcyclodisilazane

Ning ZHOU, Zhi Jie ZHANG, Cai Hong XU, Ze Min XIE

中国化学快报. 2000, 11(06): 511-512.

摘要 ( )

可视化

A new polysiloxane containing octaphenylcyclodisilazane was synthesized from the anionic polymerization of octamethylcyclotetrasiloxane (D₄) and "seed solution" as initiator, which was prepared by hexamethylcyclotrisiloxane (D₃) and the lithium salt of N,N'-bis (hydroxydi-phenyl)tetraphenylcyclodisilazane.

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Total Synthesis of 16-Acetoxy-6,7-didehydroferruginyl Methyl Ether

Yong Hong GAN, An Pai LI, Ping Yan BIE, Xin Fu PAN

中国化学快报. 2000, 11(06): 513-514.

摘要 ( )

可视化

An efficient synthetic route have been developed to 16-acetoxy-6,7-didehydroferruginyl methyl ether.

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Studies on the Preparation of Bioactive Oligomerstilbene by Oxidative Coupling Reaction (I)-Preparation of Shegansu B using Silver Oxide as Oxidant

Li Xin ZHOU, Mao LIN

中国化学快报. 2000, 11(06): 515-516.

摘要 ( )

可视化

The oxidative coupling reaction of isorhapontigenin using sliver oxide as oxidant afforded a major product, named shegansu B (2), which was isolated from the roots of Belamcanda chinensis (L.) DC. Both the natural and synthetic Shegansu B have the same potent antagonism activities of leukotriene B4, D4 receptor.

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Synthesis, Structure and Transesterification of the Derivatives of β-Alkoxycarbonylethyltin Trichlorides with Diethyldithiocarbamate

Lai Jin TIAN, Bin ZHAO, Zheng Yu ZHOU, Min XIA, Wen Tao YU, Ping YANG

中国化学快报. 2000, 11(06): 517-520.

摘要 ( )

可视化

The derivatives of b-alkoxycarbonylethyltin trichlorides with diethyldithiocarbamate, ROCOCH₂CH₂Sn(S₂CNEt₂)Cl₂, were synthesized and characterized by the means of elemental analysis, IR, ¹H NMR and X-ray single crystal diffraction. The structural features of the compounds were described, and the possible mechanism of transesterification for compound 2a was suggested.

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Study of Catalysts on the Synthesis of Methyl Acrylate by Hydroesterification of Methyl Formate with Acetylene

Xin Han HUANG, Xian Gui YANG, Jia Qi ZHANG, Zhao Tie LIU

中国化学快报. 2000, 11(06): 521-524.

摘要 ( )

可视化

The catalytic hydroesterification of methyl formate (MF) with acetylene to methyl acrylate (MA) over nickel-based catalysts prepared by impregnation has been comprehensively studied in a fixed bed reactor at 160~240℃ and under 4~6MPa, GHSV:630h^-1, CO:N₂:C₂H₂=65:28:7. In present work, we have found a catalyst of 11wt%NiO/Al₂O₃ (80~100 mesh) prepared by wet impregnation with NiCl₂ aqueous solution, then calcined in air at 500℃ for 5 h. The selectivity to methyl acrylate and the conversion of methyl formate over 11wt%NiO/Al₂O₃ catalyst are higher than other catalysts studied in this paper. The optimum reaction temperature for the hydroesterification of methyl formate with acetylene to methyl acrylate is around 220℃.

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Synthesis and Characterization of Polyurethane/Poly (Urethane Modified Bismaleimide-Bismaleimide) IPNs

Yuan Li CAI, Peng Sheng LIU

中国化学快报. 2000, 11(06): 525-526.

摘要 ( )

可视化

PU/P(UBMI-BMI) IPNs with excellent thermal stability and mechanical properties were synthesized and characterized. The interpenetrating occurs in the hard segment domains of PU, which leads to enhancement of hydrogen bonding of N-H, and narrow-distributed small size of the dispersed phase.

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Photoinduced Electron Transfer Reaction between Poly-guanylic Acid (5') with Anthraquinone-2-sulfonate

Jian Hua MA, Hua SHAO, Si De YAO, Nian Yun LIN

中国化学快报. 2000, 11(06): 527-530.

摘要 ( )

可视化

The electron transfer reaction between triplet anthraquinone-2-sulfonate with poly-guanylic acid (5) (poly[G]) in acetonitrile-H₂O has been investigated by 248 nm laser flash photolysis. The transient absorption spectra of radical cation of poly[G] and radical anion of anthraqunione-2-sulfonate(AQS) arising from electron transfer reaction has been observed simultaneously for the first time. The formation processes of radical cation of poly[G] and radical anion of anthraquinone-2-sulfonate as well as the decay processes of triplet anthraquinone-2-sulfonate have also been observed, the apparent rate constants for the formation and decay of transient species have been determined. The free energy changes in the process of the electron transfer was also calculated.

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The Identification of Two New Sterols from Marine Organism

Shi Hai XU, Long Mei ZENG

中国化学快报. 2000, 11(06): 531-534.

摘要 ( )

可视化

Two new sterol have been isolated from the South China Sea marine organism. Compound 1 was isolated from the sponge Polymastia sobustia and compound 2 was obtained from the soft coral Sinularia inexplicata. Their structures were established as 3β-hydroxy-stigmast-5en-7-one and 24-methylene cholestan-3β, 6β, 9α, 19-tetrol by variety of spectral analysis such as IR, EIMS, 1DNMR, ¹H-¹H COSY, HMQC, HMBC, NOESY.

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Two New Sterols from Amoora yunnanensis

Xiao Dong LUO, Shao Hua WU, Yun Bao MA, Da Gang WU

中国化学快报. 2000, 11(06): 535-538.

摘要 ( )

可视化

Two new sterols, 3β,7α,16β-trihydroxy-stigmast-5,22-diene 1, 3β,7α,16β-trihydroxy-stigmast-5-ene 2, were isolated together with two known ergosterols, ergosta-5,24(28)-diene-3β,7α-diol, ergosta-5,24(28)-diene-3β,7β,16β-triol from the bark of Amoora yunnanensis (H. L. Li) C. Y. Wu. Their structures were deduced on the basis of spectral data.

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Two New O-terpenoidal Coumarins, Excavacoumarin A and B from Clausena excavata

Hong Ping HE, Yue Mao SHEN, Guo Ying ZUO, Wei Ming ZHU, Xiao Sheng YANG, Xiao Jiang HAO

中国化学快报. 2000, 11(06): 539-542.

摘要 ( )

可视化

Two new O-terpenoidal coumarins named excavacoumarin A (2), B (3), and a known one 1 were isolated from the leaves of Clausena excavata Burm. f. (Rutaceae) collected in Xishuangbanna, Yunnan. Structure elucidation and unambiguous NMR assignments for the title compounds were carried out on the basis of 1D and 2D NMR experiments.

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Two New Bis-tetrahydrofuran Ring Annonaceous Acetogenins from the Roots of Uvaria calamistrata

Guang Xiong ZHOU, Ruo Yun CHEN, Hong CHEN, De Quan YU

中国化学快报. 2000, 11(06): 543-544.

摘要 ( )

可视化

Two mild-cytotoxic bistetrahydrofuran (THF) ring annonaceous acetogenins named calamistrins F (1) and G (2) were isolated from the ethanolic extract of the roots of U. calamistrata Hance. Their structures including the relative and absolute configurations were determined by chemical derivation and spectral analysis. Calamistrins F and G were a pair of epimers at C-26 which both had THF ring from C-18 to C-25 and three OH groups at C-5, C-17 and C-26.

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Photodissociation of Cycloketones by Ultraintense Femtosecond Laser Pulses

Cheng Yin WU, Yi Jia XIONG, Jin Xiong WANG, Fan Ao KONG

中国化学快报. 2000, 11(06): 545-548.

摘要 ( )

可视化

Photodissociation of cyclopentanone (C₅H₈O) and cyclohexanone (C₆H₁₀O) was studied with 800nm, 50fs laser pulse at intensities of 5.0-13.0×10¹³ W/cm². A time of flight mass spectrometer was employed to detect the ion signals. Parent ions dominated at lower laser intensities. Fragmentation of the parent ions increases with increasing laser intensity and molecular size. The fragmentation mechanism was discussed.

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The Retention Behaviors of Benzene and Its Alkyl Homologues in Microemulsion Electrokinetic Chromatography

Xiao Yun FU, Wei YUAN, Xiu Zhu XU, Jian De LU

中国化学快报. 2000, 11(06): 549-550.

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可视化

The retention behaviors of benzene and its alkyl homologues in microemulsion electrokinetic chromatography were investigated in both anionic and cationic surfactant MEEKC systems. The effects of the composition of microemulsion on retention time and selectivity were studied. A good linear relationship was obtained between log k and the carbon number of alkyl chain.

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A New Fluorescent Sensor for Transition Metal Ions in Aqueous Solution

Li Jian JIANG, Zhi Lin WANG, Xiao Qing JIANG, Qin Hui LUO

中国化学快报. 2000, 11(06): 551-554.

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可视化

A new fluorescent sensor consisted of fluorenyl and dioxotetraaza unit, namely, 2,10-dimethyl-6-(9-fluorenyl)-1,4,8,11-tetraazaundencane-5,7-dione (L), was synthesized. It is a fluorescent sensor for transition metal ions in aqueous solution.

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Structural Multiplicity of Monomers of an Amphiphilic Porphyrin at the Outer Surface of CTAB Micelle

Yun Hong ZHANG, Chen MA, Lin GUO, Qian Shu LI

中国化学快报. 2000, 11(06): 555-558.

摘要 ( )

可视化

A synthesized amphiphilic porphyrin, 5,10,15-tri(p-hydroxyphenyl)-20-(p-hexadecyl-oxyphenyl) porphyrin, can take a transfer process for the porphyrin moiety from the inner core to the outer surface layer of cetyltrimethylammonium bromide (CTAB) micelle. The increasing of FWHH of the Soret band was attributed to the multiplicity of porphyrin monomers related with deprotonation degree, arrangement, orientation, and position of porphyrin moiety at the surface area rather than the aggregates associated with irregular orientation of neighboring porphyrins.

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Growth of Carbon Nanotubes over Ni Nano-particles Prepared in Situ by Reduction of La₂NiO₄ Oxides

Qi LIANG, Qing LI, Bo Lan ZHANG, Zuo Long YU

中国化学快报. 2000, 11(06): 559-560.

摘要 ( )

可视化

A novel catalyst precursor, La₂NiO₄, was investigated to synthesize carbon nanotubes, obtained from catalytic disproportionation of CO. The morphology of carbon nanotubes has been examined by TEM (transmission electron micrograph) and SEM (scaning electron micrograph). It was observed that the Ni nano-particle size formed at different reducing temperatures was a key factor to the yield and diameter of carbon nanotubes.

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Application of CO₂-TPD in the Synthesis of Composite Oxides from Metal-Organic Precursors

Zong Ping SHAO, Hui DONG, Guo Xing XIONG, Wei Shen YANG

中国化学快报. 2000, 11(06): 561-564.

摘要 ( )

可视化

CO₂-TPD was demonstrated an effective way to investigate the phase formation during pyrolysis for the preparation of composite oxides using metal-organic molecules as precursors. Based on the CO₂-TPD results, it was found that calcination condition had deep effect on the carbonate formation and the minimum firing temperature to acquire pure phase composite oxide. An optimized calcination schedule was then developed.

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2000年, 第11卷, 第06期　刊出日期：2000-06-20

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2000年, 第11卷, 第06期 刊出日期：2000-06-20

2000年, 第11卷, 第06期　刊出日期：2000-06-20