中国化学快报

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CARBOXYMETHYLPACHYMAN (Ⅰ),A NEW WATER SOLUBLE POLYSACCHARIDE WITH MARKED ANTITUMOUR ACTIVITY

Zhong Yuan YU, Hui Jie WAN, Li Ya WANG, Lian Xi CHEN

中国化学快报. 1992, 3(01): 1-2.

摘要 ( )

可视化

Carboxymethylpachyman (Ⅰ)was formed by carboxymethylation of β-pachyman.The antitumour activity of carboxymethylpachyman (Ⅰ)against S₁₈₀、EAC、MA、U₁₄ was measured.The structure of carboxymethylpachyman (Ⅰ)was proved by IR、¹³CNMR spectroscopy.

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STUDIES ON THE PRENYLFLAVONOIDS PARTⅡ.SYNTHESIS OF EUCHRENONE A₇

Yu Lin LI, Fang Jie ZHANG, Hua Wu ShAO, Shao Bai LI

中国化学快报. 1992, 3(01): 3-4.

摘要 ( )

可视化

Euchrcnonc a₇ has been prcparcd by condensation of 2-hydroxy-4-mcthoxy-3-prcnylacctophcnone with 2,4-dimethoxymethoxybenzaldehyde followed by cyclization and demethoxymethylation.

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THE FEED BACK INHIBITION EFFECT ON THEINFECTIOUS DEVELOPMENT CAUSED BY N'-ACYL-N-PHENYLHYDRAZINE

Ping CHEN, Ren De SUN, De Shui ZHENG

中国化学快报. 1992, 3(01): 5-8.

摘要 ( )

可视化

The phenyl and methyl phenyl free radicals,formed inthe oxidation-hydrolysis process of N'-acyl-N-phenylhydrazine,have been studied by ESR spectrometry.It was found that the free radical is the chief cause which produces the feed-back inhibition effect in the hydrazine-promoted infectious development of silver halide.

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NEW HETEROCYCLIC SYSTEM SYNTHESIS H THE REACTION OF 2,3-DIHYDRO-1,5-BENZOTHIAZEPINES WITH DICHLOROCARBENE

Ruo Xi LAN, Sheng JIN, Zheng Ming Li

中国化学快报. 1992, 3(01): 9-10.

摘要 ( )

可视化

The reaction of two series of 2,3-dihydro-1,5-henzothiazepines Ⅰ with dichloro-carbene,gave azirino [2,1-d] [1,5]benzothiazepines Ⅷ,azirino [2,1-e] [1,6]benzothiazocines Ⅸ,pyrrolo [2,1-b] [1,3]benzothiazoles Ⅹ,substituted-cyclopropanes Ⅺ and 2H-1,4-benzothiazin-2-ones Ⅻ.The structures of these products were confirmed by the analytical and spectral data.Compound Ⅷ and Ⅸ are two new ring systems.

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SYNTHESIS OF 3,4-DIPHENYL-1.3,4-DIAZAPHOSPHOLIDIN-2-ONE-4-OXIDE BY MANNICH-TYPE REACTION

Ru Yu CHEN, Ke Sheng FENG

中国化学快报. 1992, 3(01): 11-14.

摘要 ( )

可视化

Phenylurea reacted with dichlorophenylphosphine and aldehydes or ketones by Mannich-type reaction in anhydrous benzene to give five-mem-bered phosphorous heterocyclic compounds.However.derivatives of α-ureidoalkylphosphonic acids were obtained as the reaction performed in glacial acetic acid.

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THE SYNTHETIC ATTEMPT OF (±)-MALABARIC ACID AND (±)-ANISOMELOL——SYNTHES IS OF PRECURSORS FOR (±)-MALABARIC ACID AND (±)-ANIOSMELOL

Ying LI, Wei Dong LI, Yu Lin LI

中国化学快报. 1992, 3(01): 15-18.

摘要 ( )

可视化

The precursors I (R'=CH₂OTHP,or CO₂Et)for (±)-Malabaric acid (1) and(±)-Anisomelol(2)were synthesized from geraniol 3 and homogeranyl iodide 5 (2,6-dimetyl-9-iodo-2,6E-nonadiene) via Wadsworth-Emmons condensation and allylic regioselective chlorination.

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THE SYNTHESIS AND CHARACTERIZATION OF ASYMMETRIC TRIPYRRANE-CONTAINING MACROCYCLES

Shi Ming DONG, Hui Zhu HE, Lin Zhi HU, Jian Min RON, Duo Yuan WANG

中国化学快报. 1992, 3(01): 19-22.

摘要 ( )

可视化

An improved procedure was used to prepare the asymmetric tripyrrane-containing macrocycles,The yield was over 85% These maerocycles could be oxidized to the methine bridled 22 π electron aromatic cadmium (Ⅱ)complexes by reating with cadmium chloride in the presence of air and their structures were characterized.

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REACTION OF M-DIMETHOXYBENZENE WITH CROTONIC ACID IN THE PRESENCE OF PPA

Yan Ling SONG, Bao Hua HUANG, Sheng JIN

中国化学快报. 1992, 3(01): 23-24.

摘要 ( )

可视化

The reaction of m-dimethoxybenzene with crotonic acid in the presence of PPA affords an unexpected compound,which has been proved to be a dimer by ¹H-NMR and MS.The x-ray struc-tural analysis has the same result.The phenomenon has not been reported.

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PHOTOCHEMICAL [2+2] CYCLOADDITION VIA RADICAL ION INTERMEDIATES.A CIDNP EVIDENCE

Han Cheng YUAN, Bao Zhen YAN, Ling Jiang CHENG, Guang Zhi XU, Er Cheng LI

中国化学快报. 1992, 3(01): 25-28.

摘要 ( )

可视化

The photochemical [2+2] cycloaddition reaction of carbonyl compunds and alkenes was studied by photochemical induced dynamic nuclear spin polarization.

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STUDIES ON THE SYNTHESIS OF DIMETHYI,4-HYDROXY -4'-METHOXY-5,6,5',6'-BISMETHYLENEDIOXYBIPHENYL-2,2'-DICAPBOXYLATE——AN ESSENTIAL METABOLITE OF DDB

Shu Li ZHAN, Chun Zhen ZHANG

中国化学快报. 1992, 3(01): 29-32.

摘要 ( )

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This paper reports the total synthesis of dimethyl 4-hydroxy-4'-methoxy-5,6,5',6'-bismethylenedioxybiphenyl-2,2'-dicarboxylate (Ⅱ).Various conditions for bromination were tried to find the best one for synthesis of the key intermediate compd 6.After Lllmann condensation of 6 with 8 and hydrogenolysis,the title compd Ⅱ was obtained.It was proved to be identical with the isolated metabolite of DDB by spectral data.

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TWO NEW AFZELECHIN GLYCOSIDES FROM-ARTHROMERIS MAIREI

Wen Sheng YU, Hong LI, Xin Min CHEN, Lei YANG

中国化学快报. 1992, 3(01): 33-34.

摘要 ( )

可视化

Two new afzelechin glycosides,arthromerin A(1)and B(2),have been isolated from the root of Arthromeris mairei (Brause)Ching.Their structur-es were determined by means of their spectral and chemical evidence.

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NEW EREMOPHILANOLIDES FROM LIGULARIA VEITCHIANA

Yu ZHAO, Zhong Jian JIA, Ren Xiang TAN

中国化学快报. 1992, 3(01): 35-38.

摘要 ( )

可视化

The structures of three new eremophilanolides isolated from the roots of Ligularia Veitchiana were shown,by the spectral and chemical evidences,to be 1β,10β-epoxy-6β-hydrox-y-8β-methoxy-eremophil-7 (11)-en-12,8α-olide (3),1β,10β-epoxy-6β-(2' hydroxymethylacryloyloxy)-8β-methoxy-eremophil-7 (11)-en-12,8α-olide (4)and 1β,10β-epoxy-6β-(2'-methoxymethylacryloyloxy)-8β-hydroxy-eremophil-7 (11)-en-12,8α-olide (5).

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THE PSEUDO ORBITAL STUDIES ON ELECTROPHILIC AROMATIC SUBSTITUTION

Fu Jiang DING, Liang Fu ZHANG, Guang Nian LI

中国化学快报. 1992, 3(01): 39-42.

摘要 ( )

可视化

The electrophilic aromatic substitution reactions have been studied by using the con-cept of pseudo orbital proposed by authors,Because the unoccupied orbitals of electrophilic reagents have been.taken into account,the present results are better than ones given by superdelocalizability,S_r.

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QUANTUM CHEMICAL CALCULATIONS ON THE ELECTRONIC STRUCTURE AND SPECTRA OF [Mo₃O₄-nSn]⁴⁺ (n=0-4) CLUSTER CATIONS

Zhi Ru LI, Qian Shu LI, Ji Kang FANG, Zhi Ren ZHENG, Jun ZHENG

中国化学快报. 1992, 3(01): 43-46.

摘要 ( )

可视化

The electronic structure and spectra of [Mo₃O₄-nSn]⁴⁺ (n=0-4) cations were calculated by means of INDO/CI quantum chemistry method to account for the experimental data of their spectra in water solutions.

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STUDY ON THE DETERMINATION OF METRONIDAZOLE IN HUMAN SERUM BY ADSORPTIVE STRIPPING VOLTAMMETRY

Zhen Hui WANG, Hong Xun ZHOU, Shu Ping ZHOU

中国化学快报. 1992, 3(01): 47-50.

摘要 ( )

可视化

In Britton-Robinson buffer,metronidazole is preconcentreted on HHDE at 0.0 V( Vs.Ag-AgCI),An adsorptive stripping peak is observed at -0.62 V.The response is linear from 1×10^-8 to 1×10^-6mol/L with 1.5 min accumulation.The method has been successfully applied to the deterination of metronidazole in human serum and formulations.

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THE STUDYOF SYNTHESIS AND CHARACTERISTICS OF POLYPHENYLACETYLENE USING WOBr₄ AS CATALYST

Yin Kui LI, Zhao Hui CHEN

中国化学快报. 1992, 3(01): 51-52.

摘要 ( )

可视化

A new kind of catalyst WOBr₄,which can be used in the polymerization of phenylacetylene (PhA),has been synthesized.The obtained polyphenylcetylene (PPhA)using WOBr₄ as catalyst is soluble、fusible、with brown-red colour and has 1831 (Mn).The analysis of the stucture of PPhA shows that the polymer has cis-transoidal structure,therefore,the reaction mechanism is via complex catalysis.

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N-ALKYLPHENOTHIAZINE RADICAL CATIONS GENERATED IN THE CAVITY OF β-CYCLODEXTRINS IN AQUEOUS SOLUTION

Qing Xiang GUO, Ping HUAN, Bo LIU, You Cheng LIU

中国化学快报. 1992, 3(01): 53-56.

摘要 ( )

可视化

Phenothiazine and i⁺s derivatives were oxidized by l₂ and 2,2,6,6-tetrametbyl-4-acetyloxypiperidine oxoammonium hexachloroantimonate to the corresponding radical cations in the cavity of β-cyclodextrins in aqueous solution.The mechanism of electron transfer between substrates and oxidants is discussed in terms of association of β-CDs

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Electron Exchange Between Oxidized and Reducrd Forms of Fcrrocene Derivatives

Chun Ying DUAN, Long Gen ZHU, Hong Zhe SUN, Xiao Zeng YOU

中国化学快报. 1992, 3(01): 57-58.

摘要 ( )

可视化

The rates of electron exchange between oxidized and reduced forms of sev-eral derivatives of ferrocene (1-3)have been measured in acetonitrile by the NMR line hoadening method at 25℃。It was found that the tes vary with the lengtn of the substitutent chain and the potential of E_{Fe(Ⅲ)/Fe(Ⅱ)} in the ferrocene derivatives.

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A STUDY OF THE XBS⁺ CATIONS (X=H,F,Cl) BY IMPROVED MS-X_α METHOD

Han Xing LIU, Chia Chung SUN

中国化学快报. 1992, 3(01): 59-62.

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可视化

By means of improved overlapping Muffin-Tin X_α method recently developed the ground state ²Πand the first excited state ²Σ⁺ of the XBS⁺ (X=H,F,Cl) cations are studied.Thecalculated energies are in good agreement with experiment.The ionization potentials of sulphi-doborons,XBS (X=H,F,Cl,Br)are also computed and compared with photoelectron spectra re-sults.

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THE STRUCTURE OF LANGMUIR-BLODGETT FILMS OF TETRA-NONYL PHTHALOCYANINE COPPER

Tao LUO, Wei Qing ZHANG, Fu Xi GAN

中国化学快报. 1992, 3(01): 63-66.

摘要 ( )

可视化

Langmuir-Blodgett (LB) films of tetra-nonyl phthalocyanine copper (TNPcCu) were prepared.Molecular arrangement and orientation of these films were studied in detail.LB multilayer films of TNPcCu show a very Strong x-ray diffration peak and two weak peaks which indicate that the LB films form a quasi-crystal structure which molecules are arranged orderly.IR reflection absorption spectra and polarized VIS absorption spectra not only confirm the previous result but also indicate that phthalocyanine rings orient nearly perpendicular to the substrate surface and perpendicular to the lifting direction and the side-chain segments are not preferred oriented.

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A POLAROGRAPHIC CATALYTIC WAVE OF OXYGEN INDUCED BY DIPHENYLAMINE COMPOUNDS

Jun Feng SONG, Wei GUO, Yin Hua HU

中国化学快报. 1992, 3(01): 67-68.

摘要 ( )

可视化

It is reported in this paper a polarographic catalytic double wave of oxygen reduction caused by diphenylamine compounds (diphs).The electrochemical process of the wave includes the polarographic generation of the superoxide anion O₂^- and the dismutation of O₂^- catalyzed by diphs with redox pseudoreversibility.

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HYDROTHERMAL SYNTHESIS OF ZEOLITE NaA BY MICROWAVE RADIATION

Xian Ping MENG, Wen Guo XU, Si Qing TANG, Wen Qin PANG

中国化学快报. 1992, 3(01): 69-70.

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In this paper,we report a novel application of microwave radiation for the synthesis of zeolite NaA in a fraction of the time required for conventional synthetic method under very mild condition.The pure product was obtained under the condition of microwave radiation in 10-20 minutes.

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STUDY ON BINDING MODE OF CISPLATIN TO F-ACTIN ON THE BASIS OF LIGAND-METAL CHARGE TRANSFER SPECTRA

Hui Hui ZENG, Jian WANG Rong, Chang LI, Kui WANG

中国化学快报. 1992, 3(01): 71-74.

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The binding mode and configuration of cisplatin with F-actin were studied on the basis of charge transfer bands of cisplatin-F-actin complex The binding mode was discussed on the basis of the results of LMCT.Raman and fluorescence spectra.

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INHIBITIVE ACTION OF INORGANIC COMPOUND ON CORROSION OF ALUMINIUM IN HYDROCHLORIC ACID

Qing Hai CAI, Bin LU Ling Fei CUI

中国化学快报. 1992, 3(01): 75-76.

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The inhibitive action of CdSO₄ towards corrosion of aluminium in 1 mol/L HCl has been inveetigated by using fluorometrio and weight loss techniques.The results show that the inhibitor exhibits an outstanding function of inhibition,especially at higher tempe-ratures,and it was found to be predomiantly of cathodic rate control.The mechanism of inhibition and the effect of CdSO₄ on the corrosion kinetics are also discussed.

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PREPARATION OF NANOCRYSTALLINE MATERIALS OF PEROVSKITE-TYPE La_1-xSr_xFeO₃ bY USINO GEL OF POLYVINYL ALCOHOL

Xi LI, Bao Kun XU, Zi Chen WANG, Feng CHI, Mu Yu ZHAO

中国化学快报. 1992, 3(01): 77-78.

摘要 ( )

可视化

Precursors of La_1-xSr_xFeO₃ (x=0.0,0.1,0.4 and 0.6) nanocrystalline materials were prepared by the mixed salts dissolved in an aqueous solution of polyvinyl alcohol(PVA).XRD,DTA and TEM were used to characterize the samples.Well-nanocrystalline perovskite-type La_1-xSr_xFeO₃ could be synthesized at the temperatures as low as 400~550℃ for 2h by the calcination of these amorphousprecursors,and the calcination of wet LaFeO₃ gel was investigated at 300℃ forlh and 700℃ for 0.5h.

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1992年, 第3卷, 第01期　刊出日期：1992-01-20

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1992年, 第3卷, 第01期 刊出日期：1992-01-20

1992年, 第3卷, 第01期　刊出日期：1992-01-20