中国化学快报

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STEREOCHEMISTRY OF THE BENZILIC ACID-TYPE REARRANGEMENT IN BASE-CATALYZED AUTOXIDATION OF 3α,5-CYCLO-5α-CHOLESTANE-6-ONE

Jia Sheng GUO, Xiao Tian LIANG

中国化学快报. 1991, 2(03): 189-190.

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The configuration of the hydroxy acid 2, a product from base-catalyzed autoxidation of 3α, 5-cyclo-5α-cholestane-6-one, was established on the basis of NMR techniques and the mechanism of the formation of 2 was discussed.

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STUDY OF THE REACTION BETWEEN α-KETOTHIOANILIDE AND PHENYLENE DIAMINE

Le Cun XU, Zhong E LU, Ke Qian CHEN

中国化学快报. 1991, 2(03): 191-192.

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When α-ketothioanilide reacts with o-phenylenediamine, there are two competing reactions. One is condensation which forms substituted quinoxaline and the other is substitution which forms substituted quinoxaline-2-thione. By controlling the reaction condition, we can obtain either quinoxaline or quinoxaline-2-thione as the main product.

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A NOVEL METHOD FOR SYNTHESIZING α,α-DISUBSTITUTED α-AMINO ACID——DIALKYLATION OF 2-OXAZOLIN-5-ONE

Ji Jun CHEN, Zheng Ming DU, Yao Zeng SHI, Hong Wen HU

中国化学快报. 1991, 2(03): 193-194.

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4, 4-Dialkyl-2-oxazolin-5-ones are prepared by one step reaction of 2-oxazolin-5-one with the magnesium methyl carbonate (MMC) and alkyIhalides. It is a novel and convenient method for synthesis of α, α-disubstitutcd α-amino acid by hydrolysis of 4, 4-dialkyl-2-oxazolin-5-ones.

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STUDIES ON HETERO-MACROCYCLIC POLYETHER (1).THE SYNTHESIS OF 10-SELENA BENZO-15-CROWN-5

Han Sheng XU, Wei Ping LI, Xiu Fang LIU

中国化学快报. 1991, 2(03): 195-196.

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The synthesis of a new type of hetero-macrocyclic polyether 2, 3-henzo-1, 4, 7, 13-tetraoxa-10-selenacyclopentadeca-2-ene is deseribed.

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A STUDY ON THE STRUCTURAL EFFECT OF DOUBLE BRIDGES CONJUGATED SYSTEMS I.CARBONYL-IMINO SYSTEM

Gui Ying LI, Cui Chen Dai, Ming Qian Jiang

中国化学快报. 1991, 2(03): 197-200.

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The struetural effect of the conjugative system (C) with carbonyl-imino bridges has been studied. The results show that:In the conjugated system (C), there is no electronic absorption peak attributable to the whole system, but there are three π-π^* bands each of which displays chacactecistics of its own independently. These indicate that the two bridges-carbonyl-and-imino-can block the tlansmlssion of the conjngative polarization of the whole system, so as to form three segments, this is verified by means of chemical synthesis and degradation.

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THE ASYMMETRIC ALKYLATIONS OF CHIRAL TRANSITION METAL COMPLEXES OF (+)-CAMPHOR IMINE

Peng GUO, Jin Chu LIU, Zhi Qiang FANG, Ai Qiao MI, Yao Zhong JIANG

中国化学快报. 1991, 2(03): 201-204.

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The asymmetric alkylations of chiral transition metal complexes derived from (+)-camphor and 2-aminomethyl-6-methylpyridine were examined under mild conditions. The formation of the complexes 2 is conductive to the enhancement of diastereoselectivity in the alkylations at room temperature.

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SYNTHESIS AND CHARACTERIZATION OF NOVEL MULTIFUNCTIONAL HOST COMPOUNDS.1.β-CYCLODEXTRIN DERIVATIVE BEARING DIETHANOLAMINE MOIETY

Bao Jian SHEN, Lin Hui TONG, Dao Sen JIN

中国化学快报. 1991, 2(03): 205-208.

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A novel β-cyclodextrin (β-CD) derivative bearing diethanolamine moiety was synthesized by a convenient method with 63% yield, and the new host compound was characterized by ¹³C-NMR, FT-IR spectra etc.

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AN EFFICIENT SYNTHESIS OF PROPARGYLIC PHOSPHONIUM SALTS

Wen Fang HUANG, Wen Jing XIAO, Ming Wu DING, Jun ZHU, Xiao Ru CHENG

中国化学快报. 1991, 2(03): 209-212.

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Alkylated propargyl bromides react with phosphiaes in acidic tetrahydrofuran solution to give propargylic phosphonium salts in good yield.

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REACTION OF ETHYL N-CYANOMETHYLBENZEHECARBOXIMIDATE WITH ALIPHATIC ALDEHYDES UNDER THE SOLID-LIQUID PHASE TRANSFER CATALYSIS

Yao Zeng SHI, Ya Jing RONG, Wei Ping JIANG, Wan Fang LU, Hong Wen HU

中国化学快报. 1991, 2(03): 213-216.

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Ethyl N-cyanomethytbenzenecarboximidate reacted with aliphatic aldehydes under the solid-liquid PTC condition to gire α-ethoxyphenylmethylene-aminoacrylonitrile derivatives and oxazoline derivatives. It is a convenient and new method for synthesis of β, β'-dihyroxy-α-amino acids by hydrolysis of the oxazoline derivatives.

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A FACILE SYNTHESIS OF 2-TRIFLUOROMETHYLPYRROLE VIA 1.3-DIPOLAR CYCLOADDITION REACTION OF 2-TRIFLUOROMETHYLOXAZOLONE AND THE ACTIVATED CARBON-CARBON MULTIPLE BOND

Wei Sheng Tian, Yu Qun Chen, Yong Rong Luo, Xiao Wen Deng

中国化学快报. 1991, 2(03): 217-220.

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The 1, 3-dipolar cycloaddition reaction of 2-trifluoromethyl-oxazolone and the activated carbon-carbon multiple bond was studied and gave a convenient way to synthesize 2-trifluoromethylpyrrole derivatives.

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STUDIES ON THE SAPONIN CONSTITUENTS OF GYNOSTEMMA LONGIPES

Xiao Li ZHANG, Heng Li ZHANG, Wen Ji SUN, Zhen Fang SHAN

中国化学快报. 1991, 2(03): 221-222.

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Two new cornpounds, saponin I and saponin Ⅱ, were isolated from Gynostemma longipes C. Y. Wu. The struetures have been characterized on the basis of chemical and spectroscopic evidence.

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THE CHEMICAL CONSTITUENTS OF COLEUS ESQUIROLII(II)

Chao Ming LI, Zhong Wen LIN, Hui Lan ZHENG, Hong Jie ZHANG, Han Dong SUN

中国化学快报. 1991, 2(03): 223-226.

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Three new diterpenoids, named esquirolin B (1), C (2), D (3) respectively, and two known cemocunds-eariocal (4) and taraxerol were isolated from Coleus esquirolii (Levl). The structure elucidation was achieved by spectroscopic means.

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NEW CYCLOARTANE SAPOGENIN AND ITS SAPONINS FROM CURCULIGO ORCHIOIDES

Jun Ping XU, Ren Sheng XU

中国化学快报. 1991, 2(03): 227-230.

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From rhizomes of Curculigo orchioideg (Xian Mao) six new cyclo-artane glycosides named curculigosaponin A~F were isolated. The new triterpenoidal sapogenin named curculigenin A, whlch is common to curculigo-saponin A~F, was formulated as 3β, 11α, 16β-trihydroxycycloartane-24-one by HR-MS and 2D-NMR technical analysis. On the basis of chemical evidence and spectral data, the structures of these saponins were elucidated.

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AN ARTIFACT BISBENZYLISOQUINOLINE ALKALOID FROM THE ROOT OF STEPHANIA TETRANDRA

Jing Zhen DENG, Shou Xun ZHAO, Tao LU, Feng Chang LOU

中国化学快报. 1991, 2(03): 231-232.

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A new artifact bisbenzylisoquinoline, 2, 2'-N, N-dichloromethyltetrandrine (1), has been ob-tained from the root of Stephania tetrandra and its structure has been advanced on the basis of spectroscopic and chemical evidence.

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PARTIAL LEAST-SQUARES (PLS) REGRESSION AND SPECTROPHOTOMETRY AS APPLIED TO THE ANALYSIS OF MULTICOMPONENT MIXTURES

Xin An LIU, Le Ming SHI, Zhi Hong XU, Zhong, Xiao PAN, Zhi Liang LI, Ying GAO

中国化学快报. 1991, 2(03): 233-236.

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The UV absorption spectra of α-naphthol, α-naphthylamine, 2, 7-dihydroxy naphthalene, 2, 4-dimethoxy ben-zaldehyde and methyl salicylate, overlap severely;therefore it is impossible to determine them in mixtures by traditional spectrophotometric methods. In this paper, the partial least-squares (PLS) regression is applied to the simultaneous determination of these compounds in mixtures by UV spectrophtometry without any pretreatment of the samples. Ten synthetic mixture samples are analyzed by the proposed method. The mean recoveries are 99.4%, 99.6%, 100.2%, 99.3% and 99.1%, and the relative standard deviations (RSD) are 1.87%, 1.98%, 1.94%, 0.960% and 0.672%, respectively.

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APPLICATION OF SIMPLEX-DEVIATION-PATTERN RECOGNITION TO THE CONFIRMATION OF THE ELECTRODE REACTION MECHANISM

Zheng Qi ZHANG, Zhao Peng CHENG, Yu Cong ZHANG

中国化学快报. 1991, 2(03): 237-238.

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Three hypotheses of the electrochemical reaction mechanism of the Dy (Ⅲ)-ALC complex were put forward, based on the experimental results. Then it has been confirmed by simplex-deviation-pattern reoognition that the pola-rographic wave of the Dy (Ⅲ)-ALC complex was an adsorptive-complex wave.

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IHIONINE-CONTAINING CHEMICALLY MODIFIED ELECTRODES FOR ELECIROCATALYTIC REDUCTION OF HEMOGLOBIN

Jian Xun ZHOU, Er Kang WANG

中国化学快报. 1991, 2(03): 239-242.

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Thionine-eontaining chemically modified eleetrode (CME) were constructed with glassy carbon substrate employing various procedures, with which electrocatalytic reduction of hemoglobin (Hb) was carried out and characterized under static and flow conditions. Linear response range over 2 orders of magnitude and detection limit of subpieomole were achieved at the CME in FIA.

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THE SEPARATIONS OF ENANTIOMERS OF α-SUBSTITUTED-(2-PYRIDYL)-METHYLAMINES ON A CHIRASIL-VAL CAPILLARY COLUMN

Lan Jun WU, Ai Qiao MI, Yao Zhong JLANG

中国化学快报. 1991, 2(03): 243-244.

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Enantiomers of α-substituted-(2-pyridyl)-methylarfdnes were separated on SC-7 gas chromatograph with a 20m×0.25mm Chirasil-Val capIlary column, Carrier gas was nitro-gen or hydrogen. The resolution factors (r_i.s) were 1.02 to 1.06. Enantiomers of pyridyl anines were separated to and near to base line.

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AN AB INITIO STU DY ON THE CORELATION BETWEEN THE ABSOLUTE CONFIGURATION AND THE CD SPECTRA OF ORGANIC PEROXIDES

Jing Jiang LIU, Gua Lin DUAN, Xiao Tian Liang

中国化学快报. 1991, 2(03): 245-248.

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Correlation between the absolute configuration and the CD spectra of organic peroxides was studied by ab initio method with a mo-del moleeule CH₃-O-O-CH₃. For P form when 0° ≤θ (twist angle of C-O-O-C) <90°, there is positive Cotton effect;when 90°< θ ≤180°, there is negative Cotton effect;the curve is bisignate at θ=90°.

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EPR AND HIGH RESOLUTION SOLID-STATE NMR STUDIES ON Fe³⁺ SUBSTITUTED ZSM-5 ZEOLITE

Wen Xia SHEN, Ying YU, Yi Chun YEN, Ying Ru DING, Cheng HU

中国化学快报. 1991, 2(03): 249-250.

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Fe³⁺ substituted ZSM-5 zeolite was studied using EPR and ²⁷Al, ²⁹Si MAS-NMR spectroscopy. The results showed that the synthe-sized sample has the typical ZSM-5 structure with Fe³⁺ ionsincorporated in tetrahedric sites in the zeolite framework and there are some para-magnetic centers in the samples.

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A STUDY ON Ti ELECTRODE MODIFIED BY NICKEL ION BEANS

Ji Shuang ZHANG, Rong Hui WANG, Yao Jiao LU, Han Ming FENG, Jin Quan YANG

中国化学快报. 1991, 2(03): 251-252.

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The reduction of H⁺ on Ti electrodes which were treated by implanting nickel ions and thermodiffusing in vacuum has been studied. The calytic activity of the afore-mentioned electroes for H⁺ reduction is much higher than that of the untreated Ti electrodes.

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A QUANTUM CHEMISTRY STUDY ON THE SIZE-DEPENDENCE OF THE CHEMISORPTION OF AMMONIA AND CARBON MONOXIDE ON ALUMINUM CLUSTERS

Lin Feng LI, Xian Zhang GU, Mu Zhen LIAO, Guo Shi WU

中国化学快报. 1991, 2(03): 253-254.

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The chemisorption intensities of NH₃ and CO on aluminum clusters Al_n (n=l-13) have been theoretically predicted by using CNDO/2 method and properly selecting the clusters'geometries. The results show that the chemisorptions of NH₃ and GO on Al₂, Al₆ and Al₁₂ are magically stable and thus are in good agreement with the experimental results. In addition, an electronic structure analysis is made to expound the nature of such a size effect.

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THE EFFECT OF DLSPERSED MoO₃ ON STRUCTURE OF ZEOLITE ZSM-11

Yu Lin DONG, Kong Zhang YANG, Jin Geng CHEN, Jie HUANG

中国化学快报. 1991, 2(03): 255-258.

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The dispersion behavior of MoO₃ on ZSM-11 and effect of dispersed MoO₃ on the framework structure of ZSM-11 have been studjed using X-ray diffraction and infrared spectroscopy.

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PREPARATION AND CHARACTERIZATION OF BINUCLEAR μ-PHENOLATOCOPPER(II) CHELATES.

Wen Bao LI, Ya Hui ZHUANG

中国化学快报. 1991, 2(03): 259-260.

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Two new water-soluble binuclear copper (Ⅱ) chelates derived from the condensation of 2, 6-diformyl-4-methylphenol with glycylglycine were characterized with spectral. magnetic and electrochemical techniques.

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THE RELATIONSHIPS BETWEEN THE POLARIZING FORCE OF CATIONS AND THE ELECTROPHILIC CHARACTER AND CATALYTIC PERFORMANCES OF PROMOTED Pt-Al₂O₃ CATALYST

Jia LIU, Xi Yao YANG, Li PANG

中国化学快报. 1991, 2(03): 261-262.

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The electronic modification effect of various metal oxides over Pt-Al₂O₃ catalyst and the relationships between the polarizing force of cations (PFC) and the electrophilic character (EC) and catalytic performances (CP) of promoted Pt catalyst have been studiec by competitive hydrogenation reaction method (CHRM) and test reaction, i. e. hydrogena-tion of benzene and hydrogenolysis of cyclopentane.

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SYNTHESIS,CHARACTERIZATION AND CRYSTAL STRUCTURES OF (η⁵-CH₃C₅H₄)M(CO)₂NO AND(η⁵-CH₃C₅H₄)M(μ₃-NH)(μ₂-NO)(μ₂-CO)Fe₂(CO)₆(M=Mo or W)

Wen Hua SUN, Shi Yan YANG, Yuan Ci YIN, Kai Bei YU, Zhong Yuan ZHOU

中国化学快报. 1991, 2(03): 263-266.

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Synthesis of complexes (η⁵-CH₃C₅H₄) M(CO)₂NO (M=Mo, I;M=W, Ⅱ) and clusters (η⁵-CH₃C₅H₄) M (μ₃-NH) (μ₂-NO) (μ₂-CO) Fe₂(CO)₆ (M=Mo, Ⅲ:M=W, IV), based on the reaction of (η⁵-C₅H₄) M(CO)₃Cl with Na[Fe(CO)₃NO] at room tem-perature, have been demonstrated, The crystal structures of Ⅱ and IV are also presented.

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1991年, 第2卷, 第03期　刊出日期：1991-03-20

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1991年, 第2卷, 第03期 刊出日期：1991-03-20

1991年, 第2卷, 第03期　刊出日期：1991-03-20