中国化学快报

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A CONVENIENT ASYMMETRIC SYNTHESIS OF 1-AMINOALKYLPHOSPHONIC ACIDS

Cheng Ye YUAN, Shu Sen LI, Guo Quan WANG, Hao WU

中国化学快报. 1993, 4(09): 753-756.

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A convenient method for the asymmetric synthesis of 1-aminoalkylphosphonic acids was described.It involved the diastereoselctive alkylation of bicyclic chloromethylphosphonamide derived from (S)-2-ani-linomethylpyrrolidine followed by subsequent conversions leading to amino compounds by Staudinger method.Acid hydrolysis afforded the target molecule in good yield.

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A MILD AND REGIOSPECIFIC OXIRANE RING OPENING TO PRECURSORS FOR PROSTANOID CONGENERS

Ai Lian ZHENG, Yuan Liu WU

中国化学快报. 1993, 4(09): 757-758.

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A stereoselective and regiospecific synthesis of procursors (2),(4),(6) and (7) of prostacyclin analogues from 2, 3-epoxylbicyclo[3.2.0]hept-6-one (1) are described.

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α-OXOKETENE CYCLIC DITHIOACETAL CHEMISTRY(XⅢ)-THE ETHERIFYING REACTION ON THE ADDUCTS OF ALIPHATIC α-OXO KETENE CYCLIC DITHIOACETALS WITH ALLYL MAGNESIUM BROMIDE

Zai Ming ZHU, Qun LIU, Zhi Yun YANG

中国化学快报. 1993, 4(09): 759-762.

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Aliphatic α-oxo ketene cyclic dithioacetals 1 were reacted with allyl magnesium bromide to afford the 1, 2-addition products 2.Catalyzed by boron trifluoride etherate, the adducts 2 were etherified by methanol to afford the corresponding methyl ethers 3.This process provides a new method for the protection of the acid sensitive hydroxyl group in 2 under mild condition.

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REACTION OF α-(1H-1, 2, 4-TRIAZOL-1-YL)ACETOPHENONE WITH PHENYL ISOTHIOCYANATE

Zheng Ming LI, Zhen Nian HUANG

中国化学快报. 1993, 4(09): 763-766.

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Reaction of α-(1H-1, 2, 4-triazol-1-yl) acetophenone with phenyl isothiocyanate in the presence of a base and subsequent alkylation leads to the ketene S, N-acetal (2), (4), (7), (8);thiazolidone (3), thiazolidine (5) and 1, 3-thiazine (6).

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SYNTHESIS OF NEW CYCLIC PHOSPHATES OF 3-HYDROXYISOXAZOLE AND THEIR DIASTEREOMERS

Rui Lian SHAO, Min Hua YANG, Cheng Xin ZHI

中国化学快报. 1993, 4(09): 767-768.

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Keeping in view the biological activities of 3-hydroxyisoxazole and cyclic phosphate derivatives, some compounds possessing these two moieties have been synthesized, the structural elucidation of these diastereomers was made depending on spectral analyses.The mechanism could be illustrated by the theories of trigonal bipyramide intermediate and pseudorotation.

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SYNTHETIC STUDIES ON 9-HYDROXY-CEMBRENE-C

Ling LI, Wei Dong LI, Yu Lin LI

中国化学快报. 1993, 4(09): 769-770.

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A dicarbonyl precursor of 9-hydroxy-cembrene-C, 8-tetrahydropyranoxy-3, 7, 11, 15-tetramethyl-14-oxo-2E, 6E, 10E-hexdecatrienal, was prepared from farnesyl acetate via four steps.

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CHEMISTRY OF 1, 2, 4-TRIAZINES XIX

Mei HAN, Xu Ling SHI, Zhen Jun YANG, Meng Shen CAI, lie Ming CHENG

中国化学快报. 1993, 4(09): 771-774.

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3-Methylthio-5-hydroxy-1, 2, 4-triazine (1c) reacted with substituted benzenesulfonyl chloride to give 3-methylthio-5-oxy-1, 2, 4-triazin-6-yl pyridinium betaine (4) in anhydrous pyridine.But when NaOH/H₂O/CH₃COCH₃ or NaOH/CH₃OH were used as reactant and solvent, 3-methylthio-4-substituted benzenesulfonyl-5-oxo-6-hydroxy-1, 4, 5, 6-tetrahydro-1, 2, 4-triazine (6) or 1-tosyl-3-methylthio-5-oxo-6-methyloxy-1, 4, 5, 6-tetrahydro-1, 2, 4-triazine (7) was obtained respectively.The above reactions show anomalous properties of nucleophilic attack on 6-carbon in 1, 2, 4-triazine ring.

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ESTER EXCHANGE OF DIPP-HIS WITH ALCOHOLS

Yao Wu Sha, Bo Tan, Yu Fen Zhao, Li Hua Yang, Yu Ping Feng

中国化学快报. 1993, 4(09): 775-778.

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Here reported the ester exchange of DIPP-His with primary alcohols and found that the rate of this reaction was increased as the increment of the carbon chain of alcohols used.

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A STUDY OF PACKING STRUCTURE OF POLY (P-PHENYLENE BENZOBISTHIAZOLE) BY MOLECULAR SIMULATION

Yue LIU, Xiao Zhen YANG

中国化学快报. 1993, 4(09): 779-782.

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Molecular simulation technique was used in an examination of the possibilities of chain packing in the crystalline state for poly (p-phenylene benzobisthiazole).It has been found that one reason of hardly forming very ordered crystal of the polymer is the existence of so many stable positions of interchain interaction along chain axis.

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STRUCTURE OF NERVOSIN D ISOLATED FROM ISODOM NERVOSUS

Mei Juan XU, Xin En HUANG, Pei Yuan CHENG, Jin XIANG, Mai TANG

中国化学快报. 1993, 4(09): 783-784.

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On the basis of spectral analysis combined with preparation of derivatives, nervosin D was identified as ent-1α, 6β, 7β, 11α, 15β-pentahydro-xy-7α, 20-epoxykaur-16-ene.

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TWO NEW IRIDOID GLYCOSIDES FROM PEDICULARIS PLICATA

Zhong Jian JIA, Jian Jun GAO, Zi Min LIU

中国化学快报. 1993, 4(09): 785-786.

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Two new iridoid glycosides, plicatoside A and plicatoside B, were isolated from whole plants of Pedicularis plicata.Their structures were identified as 2'-O-β-D-glucosyl ixoroside and 4'-O-β-D-xylosyl mussaenoside by means of chemical evidence and spectral data.

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ISOLATION AND STRUCTURE DETERMINATION OF XF-1, A NEW ANTHRACYCLINE ANTIBIOTIC

Xu Guang YAN, Jian Bo WU, Shao Zhao WANG

中国化学快报. 1993, 4(09): 787-790.

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A new Mutactimycin group antibiotic (XF-1) was isolated from the mycelium of Streptomyces sp.80-115 and its structure has been determined on the basis of its spectroscopical and chemical properties.XF-1 showed active against some Gram positive bacteria.

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STUDIES ON FLUORESCENCE ENHANCING EFFECT AND ALKALINE DEGRADATION MECHANISM OF DOXYCYCLINE AND METHACYCLINE

Yi Bing ZHAO, Wen Bao CHANG, Yun Xiang CI

中国化学快报. 1993, 4(09): 791-792.

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Degradation reaction of doxycycline or methacycline was carried out in KOH solution and intense fluorescence was obtained.A degradation mechanism of doxycycline or methacycline was suggested.

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ENUMERATION OF ISOMERS OF SUBSTITUTED CROWN ETHERS

Shi Jun YU, Jian Ji WANG

中国化学快报. 1993, 4(09): 793-794.

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The graphtheory method is used to enumerate the numbers of constitutions, configurations, chiral and achiral configurations of substituted crown ethers.The numerical results are tabulated.

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THE THEORETICAL STUDY ON INTERSECTION POINT RULE FOR HOMOLOGUES IN GAS CHROMATOGRAPHY

Fu An WANG, Qing Lai TIAN, Ying Chen GUO, Ting Zhu CAO

中国化学快报. 1993, 4(09): 795-796.

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The intersection point rule for homologues in gas chromatography was discovered many years ago^[1], now more and more application and development are occurring in recent years^[2-6], but there are few systemic theoretical studies.In this paper, based on the basic equation of retention values in gas chromatography, we prove the intersection point rule of homologues from mathematics, study the factors affecting intersection point position, give the physical meaning of intersection point, and explain the experimental rules in references.

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GAS-PHASE ION-MOLECULE REACTIONS OF BUCKMINSTERFULLERENE (C₆₀) WITH Si (CH₃)_n CL_4-n(n=2, 3) IN MASS SPECTROMETER

Xing Hua GUO, Zi Yang LIU, Shu Ying LIU

中国化学快报. 1993, 4(09): 797-800.

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Reactions of C₆₀ with Si(CH₃)_nCl_4-n (n=2, 3) in the ion source of the mass spectrometer have been studied.The corresponding adduct ions[C₆₀Si(CH₃)_mCl_3-m]⁺(m=1, 2, 3), [C₆₀SiCl]⁺ and [C₆₀CH₃]⁺ were observed and their possible structures were discussed.The results indicated that C₆₀ is very reactive to electrophiles in the gas phase.

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MATHEMATICAL MODEL FOR THERMOKINETICS OF IRREVERSIBLE CONSECUTIVE FIRST ORDER REACTIONS

Jing Song LIU, Xian Cheng ZENG, Yu DENG, An Min TIAN

中国化学快报. 1993, 4(09): 801-804.

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The mathematical model for the thermokinetics of irreversible consecutive first order reactions has been suggested, which was used for the calculation of rate constants and molar enthalpies of the two consecutive steps.And its validity has been verified by the experimental results.

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A THEORETICAL STUDY OF THE THERMODYNAMIC AND KINETIC PROPERTIES FOR THE REACTION OF FORMYL CYANIDE DECOMPOSITION

Fens Ling LIU, Shi Guang NING, Bao Ji CHEN, Ming Li SHI

中国化学快报. 1993, 4(09): 805-808.

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We compute the thermodynamic and the kinetic properties for the reaction:HCOCN→HCH+CO using the statistical theory and the transition-state theory.The equilibrium constants and the rate coefficients of this reaction are also reported here, and the half lives of formyl cyanide at different temperatures are first estimated in this work.

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TERNARY COMPLEXES OF Cu (ATP) AND HETEROAROMATIC N BASE-ISOQUINOLINE AND BENZIMIDAZOLE:STABILITY CONSTANT AND STACKING EFFECT

Fu Hai WU, Bin SONG, Liang Nian JI

中国化学快报. 1993, 4(09): 809-812.

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The stability constants of the binary complexes of Cu²⁺ with isoquinoline and benzimidazole as well as the ternary complexes of Cu(ATP) with the same ligands have been measured in aqueous solution spectrophotometrically and a strong stacking interaction between the heteroaromatic ring of the ligands and the purine moiety of ATP has been found.The fact of this stacking interaction is much stronger than that in the systems of Cu(ATP) with pyridine and imidazole shows that the stacking interaction increases with the size of the heteroaromatic ring of the ligands.

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A PHOTOELECTROCHEMICAL INVESTIGATION OF LATTICE-MATCHED SQW GaAs/Al_xGa_1-xAs ELECTRODE

Yao LIU, Yuan LIN, Xue Ping LI, Xu Rui XIAO, Chun Hui YAN, Yi Ping ZENG, Dian Zhao SUN, Hai Qun ZHENG, Hong Xi GUO

中国化学快报. 1993, 4(09): 813-814.

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Single quantum wells (SQWs) of GaAs/Al_xGa_1-xAs have been investigated as photoelectrodes in photoelectrochemical cells.Structured photocurrent spectra for well widths of 50Å and 100Å SQWs were obtained in nonaqueous solution.The dependence of structured photocurrent spectra on electrode potential were exhibited.The quantum yield was higher in SQW with 100Å well compared to 50Å well.

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IMPS STUDIES OF SEMICONDUCTOR CdSe THIN FILM ELECTRODE

Yuan LIN, Xu Rui XIAO

中国化学快报. 1993, 4(09): 815-816.

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The kinetics of interracial processes of CdSe thin film electrode before and after surface modification of 1, 1'-di linolene ferrocenyl L-B films have been studied in K₄Fe(CN)₆ solution by Intensity Modulated Photocurrent Spectroscopy (IMPS).Potential dependence of surface state relaxation time (T_s), steady state photocurrent (I_s), collection coefficient of minority carriers (G_o), rate constant of photocorrosion (K_cr), and density of surface state (N_ss) were determined in terms of frequency response analysis of IMPS plots.

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FURTHER EVIDENCE FOR FA CENTERS IN BaFCL:Eu²⁺ CRYSTAL

Wei CHEN, Mian Zeng SU

中国化学快报. 1993, 4(09): 817-820.

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The formation of color centers in BaFCl:Eu²⁺ crystal is studied in more detail and further evidence for FA centers in BaFCl:Eu²⁺ is reported.The creation of color centers in BaFCl:Eu²⁺ may be devided into three stages.Under long time X-irradiation beyond stage 1, the concentration of FA centers depends linearly on the nth (n=1, 2 or 3) power of F center concentration.While under short time X-irradiation within stage 1, the concentration dependence of FA centers on F center is complex.Simple centers are easier to create than complex centers.Possible mechanisms for color centers formation in BaFCl:Eu²⁺ are also proposed and discussed.

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THE ELECTROCATALYTIC ACTIVITY OF NiC₂0₄ FOR THE OXYGEN EVOLUTION REACTION

Peng Li CHENG, Jian Min ZHANG, Qiu Zhi SHI, Chang Chun YANG

中国化学快报. 1993, 4(09): 821-824.

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A spinel oxide NiCo₂0₄ prepared by thermal decomposition is of very high activity for the oxygen evolution reaction (OER) in alkaline solution.The oxygen evolution overpotential on NiCo₂0₄ is 0.252-0.262V in 10 M NaOH solution at 343K and current density 100 mAcm^-2.

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THE PROCESS OF THE EMULSIFIER-FREE POLYMERIZATION IN THE PRESENCE OF BARIUM SULFATE POWDER

Li CHEN, Jing LIN, Min LIN, Hai Shui HUNG

中国化学快报. 1993, 4(09): 825-826.

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The process of emulsifier-free copolymerization of the Styrene-Butyl Acrylate-K₂S₂O₈-water in the presence of Barium Sulfate (BS) powder was investigated under varied conditions within the range of BS powder quantity, initiator concentration and reaction temperature.Experimental results showed that the rate of polymerization is proportional to 0.3-power of the BS quantity and 1.3-power of the initiator concentration.There is a linear relationship of 2/3-power for the conversion and time.A process for the polymerization is propose to explain the experimental results.

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CAPILLARY ELECTROPHORETIC SEPARATION OF GANGLIOSIDES USING CYCLODEXTRIN AS BUFFER ADDITIVE

Zhao Lou YU, Li Wen CHANG, Tian Sheng SU

中国化学快报. 1993, 4(09): 827-828.

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A new method for the rapid separation of gangliosides (GLS) by capillary electrophoresis (CE) is described which is based on the use of β—cyclodextrin (β—CD) as buffer additive.The effects of β—CD concentration, pH, electrolyte composition were discussed.Under optimum conditions, the complete separation of a mixture of GM1, GD1a, GD1b and GT1b was obtained within 5 min.

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IN-SITU TIME-RESOLVED RAMAN SPECTROSCOPIC STUDIES OF SILVER ELECTRODE IN NaSCN SOLUTION

Wu Hu LI, Zhong Qun TIAN, Jing Song GAO, Qi XUE

中国化学快报. 1993, 4(09): 829-830.

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In-situ time-resolved Raman spectroscopy (TRRS) has been applied on studies of electrochemical adsorption of thiocyanate at silver electrode during potential cycles and potential step.It is shown that some dynamic information about the adsorption and desorption processes can be obtained.

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THE MECHANISM OF SURFACE METALLIZATION OF POLYVINYL ALCOHOL COMPLEX METAL CHELATE FILMS

Ding Sheng YU, Shi Zhi CHEN, Shu Ke JIAO

中国化学快报. 1993, 4(09): 831-832.

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A novel method for preparing metalllzed film has been studied.The reduction process and properties of the poly (vinyl alcohol) (PVA) were probed by several analytic means.According to the etudies, a mechanism for the polymer surface reduction metallization was proposed and proved.

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TEMPERATURE DEPENDENCE OF AIR SEPARATION OF LIQUID CRYSTALLINE TRIHEPTYL CELLULOSE/ETHYL CELLULOSE MEMBRANES

Xin Gul LI, Mei Rong HUANG, Gang LIN

中国化学快报. 1993, 4(09): 833-836.

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Triheptyl cellulose/ethyl cellulose (3/97) binary blend membranes were prepared from tetrahydrofuran, chloroform and dichloromethane solutions and their air separation capabitities were studied at different temperatures.With increasing temperature from 25 to 85℃, the flux Q_OEA of O₂-enriched air (OEA), O₂ permselectivity and the O₂ concentration Yo₂ in the OEA all increase.The membranes show a unique trend in their Yo₂~Q_OEA relationship, that is, the air separation capability increases simultaneously with the OEA permeation capability.The magnitudes of Q_OEA and Yo₂ for 17μm-thick membrane after the testing time of 36hours at 70℃ are 5×10cm³ (STP)/s·cm^-2 and 37.6%, respectively.The air separation capability depends slightly on membrane forming solvents.

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SPECTROSCOPIC STUDIES ON A HETEROMETALLOBINUCLEAR COMPLEX IN WHICH Ru (BPY)₃²⁺ WAS COVALENTLY ATTACHED TO Ni (CYCLAM)²⁺

Xian He BU, Yu LIU, Yun Ti CHEN, M.SHIONOYA, E.KIMURA

中国化学快报. 1993, 4(09): 837-840.

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The spectroscopic properties for a recently synthesized hetero-metallobinuclear complex Ru(bpy)₂ (bpy-cyclam-Ni)⁴⁺ (3) and its related complexes 1 and 2 were investigated by UV-vis and emission spectral methods.A drastic quenching offluorescence from the Ru(bpy)₃²⁺ subunit by the covalently attached quencher subunit Ni(cyclam)²⁺ was observed for complex 3, and the mechanism was discussed.

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A SIMPLE ACCESS TO UNSOLVATED MONOMERIC COMPLEXES OF EARLY LANTHANIDE IODIDES (CH₃OCH₂CH₂C₅H₄)₂LnI (Ln=La, Nd) VIA THE REACTION OF[(CH₃OCH₂CH₂C₅H₄)₂LnCl]₂ WITH NaI AND X-RAY CRYSTAL STRUCTURE OF THE LANTHANUM COMPLEX

Chang Tao QIAN, Bing Wang, Xiao Fan ZHENG, Dao Li DENG, Jie SUN

中国化学快报. 1993, 4(09): 841-844.

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(CH₃OCH₂CH₂C₅H₄)₂LnI (Ln=La, Nd) complexes have beensynthesized by the reaction between NaI and [(CH₃OCH₂CH₂C₅H₄)₂LnCl]₂ in THF; A single crystal X-ray study has shown that the lanthanum complex is an unsolvated monomer with lanthanum (Ⅲ) in a trigonal bipyramidal coordination geometry if the cyclopentadienyl ring is regarded as occupying a single polyhedral vertex.

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THE SYNTHESIS OF ZSM-35 WITH A NEW KIND OF TEMPLATING AGENT

Tian You SONG, Jia Ning XU, Yao Cai TONG, Ru Ren XU

中国化学快报. 1993, 4(09): 845-846.

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The present paper covers the synthesis of ZSM-35 molecular sieve with 1, 6-hexanediamine as templating agent, the influence of the synthesis conditions, and a discussion concerning the crystal structures of the products.

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1993年, 第4卷, 第09期　刊出日期：1993-09-20

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1993年, 第4卷, 第09期 刊出日期：1993-09-20

1993年, 第4卷, 第09期　刊出日期：1993-09-20