中国化学快报

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OZONOLYSIS OF 4-ISOPROPYLIDENEPENTACYCLO(5.4.0.0^2,6.0^3,10.0^5,9)UNDECANE-8, 11-DIONE

Jian Guang SUN, Zhuang SU, Yong Zhong YU

中国化学快报. 1995, 6(08): 645-646.

摘要 ( )

可视化

The ozonization of 4-isopropylidenepentacyclo(5.4.0.0^2,6.0^3,10.0^5,9)undecane-8, 11-dione 1 and the reductive cleavage of the ozonide 2 formed with different reagents are described.

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SHARPLESS ASYMMETRIC EPOXIDATION OF HEPTENYLPHENYLMETHYLSILANOL

Wei Chun FENG, Dung WANG

中国化学快报. 1995, 6(08): 647-650.

摘要 ( )

可视化

The Sharpless asymmetric epoxidation of 1 was carried out to give the (1S, 2S)-4 in 33% yield, which was protodesilylated, giving (-)-5 with 50% ee.The steric effect of phenyl group on silicon upon the rate and ee of the reaction was observed.The possibility of kinetic resolution of racemic silanol under the Sharpless reaction condition was examined.

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RING ENLARGEMENT OF N-HETEROCYCLES

Jian Wei ZHANG, Ji Yu GUO, Xiao Tian LIANG

中国化学快报. 1995, 6(08): 651-652.

摘要 ( )

可视化

Treatment of N-cyanomethyl quaternary ammonium salts with NaH in tetrahydrofuran gave the desired ring enlargement products via the ylide.One of the products was subjected to reduction by sodium borohydride for the removal of the CN group.

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THECHEMICAL SELECTTVE ADDITION OF GRIGNARD REAGENT TO α-CINNAMOYL KETENE(1, 2-ETHYLENE)DITHIOACETALS

Qun xin FANG, Chun LIN, Chang Shan ZHANG, Shu Jia ZHANG, Qun LIU

中国化学快报. 1995, 6(08): 653-654.

摘要 ( )

可视化

The addition reaction of Grignard reagents to α-cinnamoyl ketene (1, 2-ethylene) dithioacetals 4 was examined.The results showed that the 1, 4-manner nucleophilic attack at the cinnamoyl carbon carbon double bond occurred.Possible mechanism about the reaction selectivity is disenssed.

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STUDIES ON THE SYNTHESIS OF NOVEL ISONUCLEOSIDE FROM D-GLUCOSE

Hong Wu YU, Ling Tai MA, Li He ZHAHG

中国化学快报. 1995, 6(08): 655-656.

摘要 ( )

可视化

A novel isonucleoside, 2, 5-anhydro-4-(adenine-9-yl-)-L-iditol was synthesized from D-glucose through 9 steps.

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AN IMPROVED SYNTHESIS OF NIMBIDIOL

Rong ZHOU, Xiao Feng WANG, Yuan TIAN, Xin Fu PAN

中国化学快报. 1995, 6(08): 657-660.

摘要 ( )

可视化

Nimbidiol 1 and epi-6-oxonimbidioi 2 have been efficiently and stereospecifically synthesized from 3-isopropoxy-5, 5-dimethyl-2-cyclohexenone and iodide 3 which are readily available.

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THE SYSTHESIS OF GANODER PURINE

Yun Zhen JIANG, Xiao Lin TANG

中国化学快报. 1995, 6(08): 661-662.

摘要 ( )

可视化

The newly isolated purine alkaloid, an open chain nucleoside-ganoderpurine natural product, was synthesized by the Michael addition of adenine to mesityl oxide.

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THE SYNTHESIS OF STEROID——OLIGOPEPTIDE

Xiao ZHANG, Ling Ling WENG, Hu ZHENG

中国化学快报. 1995, 6(08): 663-666.

摘要 ( )

可视化

Six new compounds——steroid-oligopeptide were designed and synthesized with active ester method, their structures (CA-G₁, DCA-G₁, CA-G₂, DCA-G₂, CA-G₃, DCA-G₃)were confirmed by spectra and elemental analysis.Preliminary study on their bioactivities showed that the DCA-G₃ has the ability of acid-inhibition and the others have the ability of promoting acid-secretion.The metabolic time of six title compounds are longer than the positive control(Boc-G₂).

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SYNTHESIS OF A HEXACYCLOPETIDE ON SOLID SUPPORT USING BOP REAGENT

Zong Jin HAN, Zhen Kai DING, Qi Kai ZHANG

中国化学快报. 1995, 6(08): 667-668.

摘要 ( )

可视化

The linear hexapeptide(His-Gly-Asp-Ser-Gly-Asp) was synthesized on solid support.FM group was used for α carboxyl protection group at Aspl.Peptide was cyclized by BOP reagent while still attached to the solid support BOP procedure proceeded more rapidly and gave purer product than DCC/HOBt method.

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SYNTHESIS AND ANTI-HUMAN IMMUNODEFICIENCY VIRUS-1(HIV-1) ACTIVITY OF 9-(2-PHOSPHONYLMETHOXYETHYL)ADENINE (1)AND ITS REGIOISOMER 3-(2-PHOSPHONYLMETHOXYETHYL)ADENINE(2)

Xiao Hui LIU, Lin WANG, Bao He GUAN, Man KONG, Xing Quan ZHANG, Pei Zhen TAo, Hong Shan CHEN

中国化学快报. 1995, 6(08): 669-672.

摘要 ( )

可视化

We have synthesized the title compounds (1) and (2).The structure of regioisomer (4).a new acyclic nucleotide, was determined by spectroscopic methods(¹H-NMR.¹³C-NMR, ¹³C-¹H HMBC).A by-product(7) was also isolated and identified using ¹H-NMR, MS and spot tests.Antiviral activity were evaluated.

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PREPARATION OF N-t-BUTYLOXYCARBONYL-Oα-9-FLUORENYLMETHYL ESTER OF ASPARTIC ACID

Zong Jin HAN, Zhen Kai DING, Qi Kai ZHANG

中国化学快报. 1995, 6(08): 673-674.

摘要 ( )

可视化

The preparation of the α carboxyl 9-fluorenylmethyl(FM) ester of Boc-aspartic acid is described.This new protected amino acid linked to the polymeric support by β carboxyl group offers a convenient strategy for the synthesis of head-to-tail cyclopeptides while the peptides remained attached to the polymeric support.

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ALIZEXOL A.A NOVEL PROTOSTANE TYPE OF TRITERPENE FROM ALISMA ORIENTALIS(SAM).JUZEP

LU ZENG, XIAN PEN, RU YI ZHANG

中国化学快报. 1995, 6(08): 675-678.

摘要 ( )

可视化

A novel triterpene of protostane type, alizexol A(1).the first compound of this class having a substituted tetrahydropyran ring.has been isolated from the rhizome of Alisma orientalis (Sam) Juzep The structure was elucidated by spectral data.and the ring conformation was analyzed by NOESY experiment.

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THE CHEMICAL STRUCTURE OF CELASTRINE FROM CELASTRUS FLAGELLARIS

Ming An WANG, Min WANG, Jun LIU, Fu Heng CHEN, Shao Liang HONG, Li Bin MA

中国化学快报. 1995, 6(08): 679-680.

摘要 ( )

可视化

A new sesquiterpenoid named as celastrine was isolated from the seed oil of Celastrus flagellaris Rupr.Its structure was determined as 1α, 6β, 8α, 13-tetraacetoxy-9α-benzoyloxy-β-dihydroagarofuran by UV, IR, MS and NMR(¹H NMR, ¹³C NMR, ¹H-¹H COSY, ¹H-¹³C COSY, NOESY and HMBC) spectra.

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A NEW CYCLOPEPTIDE FROM VACCARIA SEGETALIS

Rong Ping ZHANG, Cheng ZOU, Yu Kun CHAI, Jun ZHOU

中国化学快报. 1995, 6(08): 681-682.

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可视化

A new cyclopeptidc designated as vaccarin A were isolated from the seeds of Vaccaria segetalis.Its structure was obtained by spectral evidence.

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THE REVISED STRUCTURE OF GNETIFOLIN A

Zhi Min WANG, Xiao Tian LIANG, Shu Feng CHEN

中国化学快报. 1995, 6(08): 683-686.

摘要 ( )

可视化

The structure of gnetifolin A, previously proposed as (1), was revised to (2) on the basis of the original spectra of gnetifolin A and the spectral data of its synthetic analogs.

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¹H AND ¹³C NMR STUDY OF INCLUSION COMPLEXATION OF DSS WITH β-CYCLODEXTRIN

Qing Xiang GUO, Tan REN, Zi Zhong LI, You Cheng LIU

中国化学快报. 1995, 6(08): 687-690.

摘要 ( )

可视化

The inclusion complexation of sodium 2, 2-dimethyl-silapentane-5-sulphonate (DSS) with β-cyclodextrin has been studied by means of NMR spectroscopy.The association constant (K_a) and thus the free energy change (-△G⁰) were determined to be 89.5 L/mol and 11.4 kJ/mol, respectively.

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MOLECULAR MECHANICAL AND QUANTUM CHEMICAL CALCULATION ON ACYLATION REACTIVITY FOR 1-(NITRO SUBSTITUTED ANILINO)-4-SUBSTITUTED-2, 6-PIPERAZINEDIONES

Hua Liang JIANG, Quan LI, Kai Xian CHEN, Yun TANG, Xu SHEN, Ru Yun JI, Yu Yuan XIE

中国化学快报. 1995, 6(08): 691-694.

摘要 ( )

可视化

Molecular mechanical and quantum chemical methods were used to calculate the conformational and electronic structures of the template molecules of (nitro substituted anilino)-4-substituted-2, 6-piperazinediones.With the calculation results we explained the acylation reactivity of title compounds satisfactorily.

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AM1 METHOD STUDY ON THE REACTION OF OZONE WITH ETHYLENE

San Guo HONG, Shen WANG

中国化学快报. 1995, 6(08): 695-698.

摘要 ( )

可视化

AMI method has been used to study the reaction of ozone with ethylene. The activation energies of every route in each step are given.

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ADSORPTIVE VOLTAMMETRIC DETERMINATION OF METHAQUALONE

Zheng Qi ZHANG, Xiao Mei HE, Li XIANG

中国化学快报. 1995, 6(08): 699-700.

摘要 ( )

可视化

The electroanalytical characteristics of methaqualone are reported in this paper.A sensitive single sweep voltammetrie procedure for trace methaqualone was developed, the detection limit being 9.0×10^-5 mol·L^-1.

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CAPILLARY ELECTROPHORESIS DETERMINATION OF INOSINE IN SOMEDRUG FORMULAE USING HYPOXANTHINE AS INTERNAL STANDARD

Yong CHEN, Zhuo Bin YUAN

中国化学快报. 1995, 6(08): 701-704.

摘要 ( )

可视化

A new rapid and accurate method for determining inosine by capillary zone electrophoresis (CZE) is presented.The electrophoresis separation was performed at 24℃ in a fused-silica capillary(51.2cm×50μmi.d., 38.5cm to UV detector) using 20mmol/L borax-20mmol/L H₃PO₄(pH 8.5) as the background electrolyte at 24KV applied voltage.Inosine samples were led into the capillary electrokinetically at 10KV for 15 seconds.In the range of 20μg/mL to 300μg/mL, inosine can be quantitatively determined with a detection limit of 2.1μg/mL and a RSD of 2.92%.Hypoxanthine was used as the internal standard.

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FLOW INJECTION SPECTROPHOTOMETRIC DETERMINATION OF VITAMIN B₁ AND VITAMIN B₂ IN MULTIVITAMIN

Hui CHANG, Jian Nan YANG

中国化学快报. 1995, 6(08): 705-706.

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可视化

Vitamin B₁ reacts with diazo-aminobenzene sulfonic acid to form a red complex in a basic medium and there is absorption of vitamin B₂ at 440 nm.A flow injection spectrophotometric determination of the two medicaments is described based on these characteristics.The method was simple and had a high selectivity and sampling rate of 60 h^-1 The dynamic linear ranges were 0-100μg ml^-1 of vitamin B₁ and 0-80μg ml^-1 of vitamin B₂, respectively.The relative standard deviation was 0.2881% (n=10) for vitamin B₁.

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ELECTROCHEMICAL BEHAVIORS OF BORON-DOPED DIAMOND FILM ELECTRODES GROWN SELECTIVELY

Jian Zhong ZHU, Shen Zhong YANG, Pei Ling ZHU, Xi Kang ZHANG, Guo Xiong ZHANG, Chun Fang XU, Huan Zhang FAN

中国化学快报. 1995, 6(08): 707-710.

摘要 ( )

可视化

The electrochemical behaviors of boron-doped diamond film electrodes grown selectively with 4×4mm² in size have been studied using cyclic voltammetry and potentiostatic method.The diamond electrode exhibits adequate electrochemical activity and the response current changes linearly with K₃Fe(CN)₆ concentrations.The response current is proportional to the square root of scan rate, reflecting that mass transport was controlled by planar diffusion.Stable mass transport was quickly established within 4 seconds.Good stability and reproducibility are attractive properties of the diamond electrode for sensor applications.

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SYNTHESES AND PROPERTIES OF POLY(N-ISOPROPYLACRYLAMIDECO-N-ACRYLOXYSUCCINIMIDE)AND ITS IgG-CONJUGATE

Ying WANG, Ren Xi ZHUO

中国化学快报. 1995, 6(08): 711-712.

摘要 ( )

可视化

A series of copolymers of N-isopropylacrylamide and N-acryloxysuccinimide with different active ester contents and different molecular weights and their conjugates with IgG were prepared.The properties of copolymers and IgG-bearing polymers were studied.

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QUATERNARY AMMONIUM HALIDE-HYDROGEN HALIDE COMPLEX: A NEW CATALYST IN THE CLEAVAGE AND ESTERIFICATION OF BENZYL ALKYL ETHERS WITH CARBOXYLIC ACIDS UNDER MICROWAVE IRRADIATION

Yu Lin JIANG, Yu Qiao HU, Yun Cheng YUAN

中国化学快报. 1995, 6(08): 713-714.

摘要 ( )

可视化

The complex of quaternary ammonium halide and hydrogen halide was found to be the very efficient catalyst in the rapid cleavage and esterification of benzyl alkyl ethers with carboxylic acids under microwave irradiation.

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THE INVESTIGATION OF METHANE OXIDATIVE COUPLING ON BaF₂-LaOF CATALYST

Zi Sheng CHAO, Xiao Ping ZHOU, Hui Lin WAN, Khi Ri TSAI

中国化学快报. 1995, 6(08): 715-718.

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可视化

The OCM reaction was studied on BaF₂-LaOF catalyst and the results show that CH₄ can be effectively activated and selectively converted to C₂⁺.Under the reaction conditions of GHSV=15000h^-1 and reaction temperature 1044K, the high C₂⁺ yield of 20.66% with CH₄, conversion of 33.08% and C₂⁺ selectivity of 62.47% was obtained at CH₄:O₂=3:1, and the high C₂⁺ selectivity of 84.55% with CH₄ conversion of 16.54% was obtained at CH₄:O₂=9:1.XRD results suggest that tetragonal LaOF is the active phase in BaF₂-LaOF catalyst.

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SYNTHESIS AND CATALYTIC PROPERTIES OF LAYERED DOUBLE HYDROXIDES PILLARED BY HETEROPOLYOXOMETALATE

Zheng XU, He Ming HE, Dong Mei ZHOU, Ling Shen WEN, Da Zhen JIANG, Yue WU

中国化学快报. 1995, 6(08): 719-722.

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可视化

Layered double hydroxides (LDHs) pillared with heteropolyoxometalate have been synthesized via both restructuring of hydrotalcite-like compounds and direct anion exchange under microwave field.LDHs and their derivatives are both found to be efficient for alkylation of isobutane with butene with a higher butene conversion and selectivity towards C₈^o.

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ESR STUDY OF ZrO₂ CATALYST

Wen LI, Liang Bo FENG, Yuan Qi YIN

中国化学快报. 1995, 6(08): 723-726.

摘要 ( )

可视化

The intensity of the signal(g=1.974) resulted from Zr³⁺ ion on the surface of ZrO₂ catalyst, increased with the calcination temperature and time, but that of the signal (g=2.003) resulted from F_s⁺ centers (surface oxygen ion vacancies with a single trapped electron) decreased and finally disappeared at 550℃.

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IN SITU FTIR SPECTRAL STUDY OF THE OXYGEN ADSPECIES ON SrF₂/La₂O₃ CATALYST DURING THE OXIDATIVE COUPLING OF METHANE

Rui Qiang LONG, Shui Qin ZHOU, Ya Ping HUANG, Hai You WANG, Hui Lin WAN, Khi Rui TSAI

中国化学快报. 1995, 6(08): 727-730.

摘要 ( )

可视化

In situ FTIR spectra have been used to characterize surface oxygen adspecies on 20%SrF₂/La₂O₃ catalyst used for the oxidative coupling of methane (OCM).The O₂^- surface superoxide with characteristic vibration frequency at 1113-1123 cm^-1 was formed on the sample after treatment with H₂ at 700℃ following exposure to O₂ at temperatures between 650℃ and 25℃, The O₂^- adspecies could also be detected on the working sample at 650℃ and might play an important role in the OCM reaction leading to the production of C₂H₄ from CH₄.These results provide evidence that superoxide ions may be the active oxygen on 20%SrF₂/La₂O₃ catalyst during the oxidative coupling of methane.

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THE THERMAL DECOMPOSITION OF BARIUM(Ⅱ) TETRAPHENYLBORATE

Bao Xue ZHOU, Wei Ke ZHONG, Li Zhuang ZOU, Xiao Ling WANG

中国化学快报. 1995, 6(08): 731-734.

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可视化

The compound barium(Ⅱ) tetraphenylborate, Ba(Bph₄)₂·4H₂O has been prepared, and its decomposition mechanism was studied by TG and DTA.The thermal decomposition products were examined by gas chromatography and chemical methods.Kinetic analysis for the first stage of thermal decomposition process was obtained by TG-DTG curves and kinetic parameters were obtained from analysis of the TG-DTG curves with integral and differential methods.The most probable kinetic function was suggested by comparison of kinetic parameters.Mathematical expression for the kinetic compensation effect was derived.

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HYDROGENOLYSIS OF ARYL HALIDES WITH POWDERS OF ALKALI METAL HYDRIDES OF NANOMETRIC SIZE

Yi Ping ZHANG, Shi Jian LIAO, Yun XU, Dao Rong YU

中国化学快报. 1995, 6(08): 735-738.

摘要 ( )

可视化

Superfine powders of alkali metal hydrides of nanometric size exhibit very high reactivity in the hydrogenolysis of aryl halides.

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1995年, 第6卷, 第08期　刊出日期：1995-08-20

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1995年, 第6卷, 第08期 刊出日期：1995-08-20

1995年, 第6卷, 第08期　刊出日期：1995-08-20