中国化学快报

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PREPARATION OF ENANTIOMERICALLY PURE SYN-4,5-DIHYDROXY CARBOXYLIC ACID LACTONES BY MICROBIAL REDUCTION

Jian Xin GU, Zu Yi LI, GUo Qiang LIN

中国化学快报. 1991, 2(05): 345-346.

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Enantiomerically pure syn-4,5-dihydroxy carboxylic acid lactones were prepared by microbial reduction of acyl lactones with resting cell of Aspergillus niger.

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A CONVENIENT SYNTHESIS OF PERFLUOROALRYLBENZO CROWN ETHERS

Wei Yuan HUANG, Jin Tao LIU

中国化学快报. 1991, 2(05): 347-348.

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Perfluoroalkylbenzo crown ethers were readily prepared from the reaction of benzo crown ethers with sodium perfluoroalkanesulfinates in the presence of an oxidizing agent such as Ce(SO₄)₂ or Mn(OAc)₃·2H₂O in good yields through a radical process.

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ASYMMETRIC SYNTHESIS WITH ORGANO-TITANATE REAGENTS COORDINATED BY TARTARATE-LIKE LIGAND

Ji Tao WANG, Xiu Ju FAN, Xiao FENG, Yue Ming LI

中国化学快报. 1991, 2(05): 349-350.

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A series of substituted chiral benzhydrols were synthesized by the reaction of aromatic aldehydes with chiral intermediates formed from chiral titanates and arylmagnesium halides.

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LOW-VALENT TITANIUM INDUCED REDUCTIVE COUPLING OF AROMATIC NTTRILES TO 1,2-ARYLETHANONES

Wei Xing CHEN, Jian Xie CHEN, Jian Ping JIANG, Tsi Yu KAO

中国化学快报. 1991, 2(05): 351-352.

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Reductive coupling of aromatic nitriles 1 by titanium tetrachloride/zinc provides an efficient general synthesis of 1,2-arylethanones.

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A NEW METHOD FOR THE PREPARATION OF PHENOLS AND ITS DERIVATIVES

Qun LIU, Kocienski PHILIP

中国化学快报. 1991, 2(05): 353-356.

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α-Oxo ketene dithioacetals 2 via 1,2-nucleophilie addition by methallyl magnesium chloride afforded corresponding alcohols (3). Treated with water or methanol and catalyzed by Lewis acid, the alcohols 3 were converted regiospecifically to substituted phenols 5'or related phenol methyl ethers 5 respectively. This reaction is a novel approach to the synthesis of phenols and their derivatives starting from non-aromatic precursors.

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STUDIES ON CROWN ETHER CYANINE DYES (X). THE SYNTHESIS OF BENZOXAZOLE CROWN ETHER CYANINE DYES

Xiu Fang LIU, Rong Hua TU, Han Sheng XU

中国化学快报. 1991, 2(05): 357-358.

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A simple method for synthesis of benoxazole crown ether cyanine dyes is described.

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PHASE TRANSFER CATALYZED DARZENS REACTION OF 9-CHLOROFLUORENE

Wu Ji TAO, Yan Chao GUO, Lu Wen XING

中国化学快报. 1991, 2(05): 359-360.

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9-Chlorofluorene reacted with aromatic aldehydes and ketones in the presence of phase transfer catalyst, giving the Darzens conden-sation epoxy products.

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CHEMISTRY OF DENUDATINE. I. A NOVEL REARRANGEMENT OF DENUDATINE

Feng Peng WANG, Jian Zhong WANG, Rong ZHANG

中国化学快报. 1991, 2(05): 361-362.

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Treatment of denudatine 1 with 10% HCl soln. at 45-50℃ for 3 days leads to a pair of epimers 4A and 4B, Structures of 4A and 4B have been elucidated on the basis of chemical and spectral methods.

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CHEMISTRY OF DENUDATINE Ⅱ. THE REACTIONS OF DENUDATINE AND DIACETYLDENUDATINE WITH NBS-HOAc

Feng Peng WANG, Jian Zhong WANG, Rong ZHANG

中国化学快报. 1991, 2(05): 363-364.

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The reactions of denudatine 1 and diacetyldenudatine 2 with NBS-50% HOAc soln. afforded 4 and 6, respectively, in high yields.Treatment of 6 with (Ac)₂CO-Pyr. gives 7. The structures of 3,6 and 7 were deduced on the basis of spectral and chemical methods.

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STUDIES ON THE INDOLE ALKALOIDS OF GELSEMIUM ELEGANS

Zong Ping ZHANG, Xiao Tian LIANG, Fang SUN, Yang LÜ, Jing YANG, Qi Yi XING

中国化学快报. 1991, 2(05): 365-368.

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The modified Hofmann degradation of koumine(1) has proved abortive. The struture and stereochemistry of the main product(3) were deduced by spectral methods and confirmed by X-ray diffration analysis. From the roots of Gelsemium elegans, dihydrokounine was first isolated as a natural product.

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STUDIES ON NEW ALKALOIDS OF STEMONA MAIREI

Wen Han LIN, Yang YE, Ren Sheng XU

中国化学快报. 1991, 2(05): 369-370.

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Two new alkaloids, maistemonine and oxymaistemonine were isolated from the roots of Stemona mairei collected from Yunnan Province, southwest of China. Their structures were elucidated by 2D-NMR techniques including ¹H-¹H COSY, ¹³C-¹H-COSY, NOESY and other spectral analyses.

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TEUPONXN: A NEO-CLERODANE DITERPENE FROM TEUCRIUM JAPONICUM

Zhi Da MIN, Ning XIE, Shou Xun ZHAO, Chong Shu WANG, Qi Tai ZHENG

中国化学快报. 1991, 2(05): 371-372.

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A nco-clcrodane diterpcne, teuponin, was isolated from the aerial parts of Teucrium japonicum. Its structure was established as (12S)-19-nor-neo-clcroda-15α-hydroxy-4,13-diene-16,15;18,6β;20,12-triolide by spcctroscopic means. The absolute configuration was determined by X-ray diffraction analysis and CD spectrum.

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STUDIES ON THE CHEMICAL CONSTITUENTS OF SAUSSUREA GOSSYPIPHORA D.DON

Shang Zhen ZHENG, Xu Wei SHEN, Jian Hua YU, Li Ping SUN, Yue Hua GUO

中国化学快报. 1991, 2(05): 373-374.

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Two new compounds, ergostan-3.24-diol(4) and 2-hydroxy-lappaol B(8) along with twelve known compounds have been isolated fron the aerial parts of Sanssurea gossypiphora D.Don. Their structures have been elucidated by spectral analysis and chealcal aethods.

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STUDIES ON THE CHEMICAL CONSTITUENTS OF PULSATILLA CHINENSIS (Ⅱ)¹

Wen Cai YE, Shou Xun ZHAO, Hao CAI, Jing Han LIU

中国化学快报. 1991, 2(05): 375-376.

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Two new compounds have been isolated from methanol extract of roots of Pulsatilla chinensis(Bunge) Hegel. Their structures were established as 3-oxo-23-hydroxy-lup-20(29)-en-28-oic acid (Ⅱ) and 3-0-α-L-arabinopyranosyl-3β, 23-dihydroxy-lup-20(29)-en-28-oic acid (Ⅲ).

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THE STRUCTURE OF PARVIFOLISIDE FROM ISODCN PARVIFOLIA LEAVES

Yue Wei GU, Pei Yuan CHENG, Guang Yi XU

中国化学快报. 1991, 2(05): 377-380.

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A new diterpene glucoside with an ent-kaurene skeleton was isolated from Isodon parvifolia(Butalin)Hara. Its structure (1) was established by spectrbscopic and chemical methods.

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ABSORPTION SPECTRA OF 4f ELECTRON TRANSITIONS IN THE SYSTEM OF NEODYMIUMSEMIXYLENOL ORANGE-CETYLPYRIDINIUM CHLORIDE

Nai Xing Wang

中国化学快报. 1991, 2(05): 381-382.

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In this paper the absorption spectra of Nd-SXO-CPC complex by 4f electron tran-sitions have been studied by zero-order and fourth-order derivative spectrophotometry. The molar absorptivity is 2.6×10³ 1.mol^-1·cm^-1 at 585 nm, the fourth-order derivative molar absorptivity is 1.4×10⁴ 1.mol^-1·cm^-1 at 584.5(-) and 587(+) nm. They are 300 times and 1600 times greater than those of the chloride, respectively.

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SYNTHESIS OF INTERFERON-α_A MONOCLONAL ANTIBODY PACKING MATERIAL IN HIGH-PERFORMANCE AFFINITY CHROMATOGRAPHY AND PURIFICATION OF RECOMBINANT HUMAN INTERFERON-α_A

Wen Ke FENG, Xin Du GENG

中国化学快报. 1991, 2(05): 383-386.

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A new way for the synthesis of human interferon-α_A monoclonal antibody (IFN-α_A-McAb) bound to silica gel packing material in high-performance affinity chromatography (HPAFC) has been developed. The high coupling efficiency and specific activity of IFN-α_A-McAb can be obtained by activated diol-silica gel with activating agent. After purification using this packing material in HPAFC, the specific activity of recombinant human interferon-α_A (rIFN-α_A) rose up to 1.03×10⁷IU/mg protein and the purification efficiency is appoximately 100 times.

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STUDIES ON THE AROMA CONSTITUENTS OF ROASTED HANGZHOU GREEN TEA AND THE FRESH LEAVES BY GC/MS

Xin Weng PANG, Cao Yuan QIAN, Yue Ling GU

中国化学快报. 1991, 2(05): 387-390.

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To investigate the aroma components characteristic of roasted green tea and fresh tea leaves the aroma concentrate was obtained by distillation and then extraction[1,2]. The aroma concentrate was treated under various experimental conditions. 70 and 52 aroma components were identified in roasted green tea and fresh tea leaves respectively.

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QUALITY ASSESSMENT OF GINSENG BY CHEMICAL FUZZY PATTERN RECOGNITION

Kai Shun BI, Xu LUO, Xi WANG

中国化学快报. 1991, 2(05): 391-392.

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A new method of assessing ginseng and screening its bioactive constituents by fuzzy pattern recognition has been proposed.

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NON-AQUEOUS REVERSED PHASE HPLC WITH LOW-WAVELENGTH UV DETECTION FOR TRIGLYCERIDE ANALYSIS

Yi Cheng LONG, Wan Zhen LU

中国化学快报. 1991, 2(05): 393-396.

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Glycerides are first separated to classes of triglycerides(TGs), diglycerides(DGs) and monoglycerides(MGs) by normal phase HPLC on silica gel column. Individual triglyceride separation is then achieved by non-aqueous reversed phase(NARP) HPLC on C₁₈ column with UV detection at 215nm.

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A STUDY OF DOUBLY CHARGED ION MASS SPECTRA(2E SPECTRA) OF BIPHENYL DERIVATIVES

Feng He QIU, Shu Ying LIU

中国化学快报. 1991, 2(05): 397-398.

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The 2E spectra and substituent effects and target gas pressure dependence of the 2E spectra of 7 biphenyl derivatives were discussed. The electron-donating groups favour the molecular ions, but the electron withdrawing groups favour the fragaent ions produced by losing the substituents from molecular ions. The variation of target gas pressure affects the TIC,sample ion current,and the ratio of sample ion current to TIC sharply.However it has no effect on the fragmentation pattern.

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LIGAND FIELD PARAMETERS OF Nd³⁺ IN LASER CRYSTALS OF LiNdP₄O₁₂

Jian Jun WANG, Yu Jian YOU, Xiao Zeng YOU

中国化学快报. 1991, 2(05): 399-400.

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A ligand-field calculation has been performed on laser crystal LiNdP₄O₁₂ with C_2v point group. The parameters of ligand field of this crystal is obtained and discussed. The calculated Stark sublevels are in good agreement with the enperimental values within 6.7 cm^-1.

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THE STUDY OF THE REACTION OF THE QUASI-AROMATIC COMPLEX [Ni(PnAO)-6H]°WITH FORMALDEHYDE: KINETICS AND MECHANISM

Bin SONG, Qi Yan ZHANG, Yun Ti CHEN, R. K. MERMANN

中国化学快报. 1991, 2(05): 401-402.

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The kinetics of the reaction of [Ni(PnAO)-6H]° with formaldehyde was studied in H₂O-CH₃OH solution under neutral condition and a complicated mechanism with three steps including competitive, consecutive and reverse reactions was proposed.

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INTERACTION MECHANISM OF AMPHOTERIC COLLECTOR-I WITH METALLIC IONS AND MINERALS

Xu Xin SHAO, Meng Xiong GUO, K. Z. LIAO

中国化学快报. 1991, 2(05): 403-404.

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The electronic structure and bonding nature of adsorbing bonding complexes which consist of Amphoteric Collector-I and Mg²⁺, Ca²⁺, MgPO₄^-, CaPO₄^-, CaCO₃, as well aa MgCO₃, are studied using quantum chemistry CNDO/2, It is predicted that magnesium salts are more liable to form adsorbing chelates with Amphoteric Collector-I than calcium salts, and all results coincide with that obtained in flotation

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THE NEW MODEL FOR CALCULATION OF STANDARD ENTROPIES OF SOLID COMPOUNDS Ⅲ CALCULATION FOR STANDARD ENTROPIES OF SOLID BINARY OXIDES

Xun Min YU, Yuan Li ZHAO, Dao Wu YANG

中国化学快报. 1991, 2(05): 405-406.

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This paper establishes a new model for calculation of the standard entropies of solid binary oxides as follows:S₂₉₈^θ=27.07×Φ₁+1.120×Φ₂+n₁×k×Φ₃-22.19 e.u (R=0.9960) We have invesigated 103 binary oxides. and found good agreemenl between estimated and experimental entropies.

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THE ATOMIC WEIGHT OF INDIUM

Tsing Lien CHANG, Ying Kai XIAO

中国化学快报. 1991, 2(05): 407-410.

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Five samples of the indium material were examined for the isotopic abundance, and no variation was found. The isotopic ratio R_191/193 was precisely measured by thermal ionization mass spectrometry, yielding a new value of the atomic weight of indium, which after correc-tion for the vaporization effect is 114.8185±0.0002.

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THE PREPARATION OF ISOPOLYMOLYBDIC ACID-POLYANILINE FILM MODIFIED ELECTRODE AND ITS CATALYTIC EFFECTS ON CHLORATE IONS

Shao Jun DONG, Bao Xing WANG, Fa Yi SONG

中国化学快报. 1991, 2(05): 411-414.

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The preparation method of H₄Mo₈O₂₆-polyaniline film modified electrode and its voltammetric behaviour are described. The modified electrode has high electrocatalytic activity on chlorate ions.

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INFLUENCE OF SILVER-DOPING ON THE SUPERCONDUCTIVITY FOR YBa₂Cu₃0_7-y

Jian MENG, Yu Fang REN, Man Zhi NIU

中国化学快报. 1991, 2(05): 415-418.

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The effect of substituting silver for barium on the structure and superconducting properties of YBa₂Cu₃O_7-y has been studied. The structure of the silver-doping system (YBa_2-xAg_xCu₃O_7-y) with x<0.3 is orthorhombic. For x>0.3, YBCO, Y₂BaCuO₅ phase and metallic silver ro-exist in the system. The superconducting transition temperature T_c(R=0) decrease with increasing silver content. However, the critic current density J_c is found to be enhanced from 56.6 A/cm² to 195 A/cm²

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ISOLATION AND PURIFICATION OF METHANE IVf ONOOXYGENASE FROM METHYLOMONAS SPECIES GYJ3

Ai Min LIU, Shu Ben LI, De Xun MIAO Wei LeYU, Fang ZHANG, Pu SU

中国化学快报. 1991, 2(05): 419-422.

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A three-component enzyme system that catalyzes in vivo the oxidation of CH₄ to CH₃OH has been purified with high specific activity from an unusual type I methanotroph through the use of stabilizing reagents.

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1991年, 第2卷, 第05期　刊出日期：1991-05-20

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1991年, 第2卷, 第05期 刊出日期：1991-05-20

1991年, 第2卷, 第05期　刊出日期：1991-05-20