1991 Volume 2 Issue 5

PREPARATION OF ENANTIOMERICALLY PURE SYN-4,5-DIHYDROXY CARBOXYLIC ACID LACTONES BY MICROBIAL REDUCTION
Jian Xin GU , Zu Yi LI , GUo Qiang LIN
1991, 2(5): 345-346
[Abstract](180) [FullText HTML] [PDF 95KB](1)
Abstract:
Enantiomerically pure syn-4,5-dihydroxy carboxylic acid lactones were prepared by microbial reduction of acyl lactones with resting cell of Aspergillus niger.
A CONVENIENT SYNTHESIS OF PERFLUOROALRYLBENZO CROWN ETHERS
Wei Yuan HUANG , Jin Tao LIU
1991, 2(5): 347-348
[Abstract](185) [FullText HTML] [PDF 71KB](1)
Abstract:
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.
ASYMMETRIC SYNTHESIS WITH ORGANO-TITANATE REAGENTS COORDINATED BY TARTARATE-LIKE LIGAND
Ji Tao WANG , Xiu Ju FAN , Xiao FENG , Yue Ming LI
1991, 2(5): 349-350
[Abstract](196) [FullText HTML] [PDF 81KB](1)
Abstract:
A series of substituted chiral benzhydrols were synthesized by the reaction of aromatic aldehydes with chiral intermediates formed from chiral titanates and arylmagnesium halides.
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
1991, 2(5): 351-352
[Abstract](194) [FullText HTML] [PDF 92KB](1)
Abstract:
Reductive coupling of aromatic nitriles 1 by titanium tetrachloride/zinc provides an efficient general synthesis of 1,2-arylethanones.
A NEW METHOD FOR THE PREPARATION OF PHENOLS AND ITS DERIVATIVES
Qun LIU , Kocienski PHILIP
1991, 2(5): 353-356
[Abstract](182) [FullText HTML] [PDF 104KB](1)
Abstract:
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.
STUDIES ON CROWN ETHER CYANINE DYES (X). THE SYNTHESIS OF BENZOXAZOLE CROWN ETHER CYANINE DYES
Xiu Fang LIU , Rong Hua TU , Han Sheng XU
1991, 2(5): 357-358
[Abstract](192) [FullText HTML] [PDF 57KB](1)
Abstract:
A simple method for synthesis of benoxazole crown ether cyanine dyes is described.
PHASE TRANSFER CATALYZED DARZENS REACTION OF 9-CHLOROFLUORENE
Wu Ji TAO , Yan Chao GUO , Lu Wen XING
1991, 2(5): 359-360
[Abstract](187) [FullText HTML] [PDF 68KB](1)
Abstract:
9-Chlorofluorene reacted with aromatic aldehydes and ketones in the presence of phase transfer catalyst, giving the Darzens conden-sation epoxy products.
CHEMISTRY OF DENUDATINE. I. A NOVEL REARRANGEMENT OF DENUDATINE
Feng Peng WANG , Jian Zhong WANG , Rong ZHANG
1991, 2(5): 361-362
[Abstract](202) [FullText HTML] [PDF 89KB](1)
Abstract:
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.
CHEMISTRY OF DENUDATINE Ⅱ. THE REACTIONS OF DENUDATINE AND DIACETYLDENUDATINE WITH NBS-HOAc
Feng Peng WANG , Jian Zhong WANG , Rong ZHANG
1991, 2(5): 363-364
[Abstract](193) [FullText HTML] [PDF 109KB](1)
Abstract:
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.
STUDIES ON THE INDOLE ALKALOIDS OF GELSEMIUM ELEGANS
Zong Ping ZHANG , Xiao Tian LIANG , Fang SUN , Yang LÜ , Jing YANG , Qi Yi XING
1991, 2(5): 365-368
[Abstract](198) [FullText HTML] [PDF 138KB](1)
Abstract:
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.
STUDIES ON NEW ALKALOIDS OF STEMONA MAIREI
Wen Han LIN , Yang YE , Ren Sheng XU
1991, 2(5): 369-370
[Abstract](185) [FullText HTML] [PDF 76KB](2)
Abstract:
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.
TEUPONXN: A NEO-CLERODANE DITERPENE FROM TEUCRIUM JAPONICUM
Zhi Da MIN , Ning XIE , Shou Xun ZHAO , Chong Shu WANG , Qi Tai ZHENG
1991, 2(5): 371-372
[Abstract](189) [FullText HTML] [PDF 79KB](1)
Abstract:
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.
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
1991, 2(5): 373-374
[Abstract](188) [FullText HTML] [PDF 91KB](3)
Abstract:
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.
STUDIES ON THE CHEMICAL CONSTITUENTS OF PULSATILLA CHINENSIS (Ⅱ)1
Wen Cai YE , Shou Xun ZHAO , Hao CAI , Jing Han LIU
1991, 2(5): 375-376
[Abstract](192) [FullText HTML] [PDF 83KB](1)
Abstract:
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).
THE STRUCTURE OF PARVIFOLISIDE FROM ISODCN PARVIFOLIA LEAVES
Yue Wei GU , Pei Yuan CHENG , Guang Yi XU
1991, 2(5): 377-380
[Abstract](199) [FullText HTML] [PDF 594KB](1)
Abstract:
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.
ABSORPTION SPECTRA OF 4f ELECTRON TRANSITIONS IN THE SYSTEM OF NEODYMIUMSEMIXYLENOL ORANGE-CETYLPYRIDINIUM CHLORIDE
Nai Xing Wang
1991, 2(5): 381-382
[Abstract](187) [FullText HTML] [PDF 79KB](2)
Abstract:
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.
SYNTHESIS OF INTERFERON-αA MONOCLONAL ANTIBODY PACKING MATERIAL IN HIGH-PERFORMANCE AFFINITY CHROMATOGRAPHY AND PURIFICATION OF RECOMBINANT HUMAN INTERFERON-αA
Wen Ke FENG , Xin Du GENG
1991, 2(5): 383-386
[Abstract](182) [FullText HTML] [PDF 158KB](1)
Abstract:
A new way for the synthesis of human interferon-αA monoclonal antibody (IFN-αA-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-αA-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-αA (rIFN-αA) rose up to 1.03×107IU/mg protein and the purification efficiency is appoximately 100 times.
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
1991, 2(5): 387-390
[Abstract](182) [FullText HTML] [PDF 141KB](2)
Abstract:
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.
QUALITY ASSESSMENT OF GINSENG BY CHEMICAL FUZZY PATTERN RECOGNITION
Kai Shun BI , Xu LUO , Xi WANG
1991, 2(5): 391-392
[Abstract](187) [FullText HTML] [PDF 459KB](1)
Abstract:
A new method of assessing ginseng and screening its bioactive constituents by fuzzy pattern recognition has been proposed.
NON-AQUEOUS REVERSED PHASE HPLC WITH LOW-WAVELENGTH UV DETECTION FOR TRIGLYCERIDE ANALYSIS
Yi Cheng LONG , Wan Zhen LU
1991, 2(5): 393-396
[Abstract](181) [FullText HTML] [PDF 124KB](2)
Abstract:
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.
A STUDY OF DOUBLY CHARGED ION MASS SPECTRA(2E SPECTRA) OF BIPHENYL DERIVATIVES
Feng He QIU , Shu Ying LIU
1991, 2(5): 397-398
[Abstract](183) [FullText HTML] [PDF 107KB](1)
Abstract:
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.
LIGAND FIELD PARAMETERS OF Nd3+ IN LASER CRYSTALS OF LiNdP4O12
Jian Jun WANG , Yu Jian YOU , Xiao Zeng YOU
1991, 2(5): 399-400
[Abstract](193) [FullText HTML] [PDF 85KB](0)
Abstract:
A ligand-field calculation has been performed on laser crystal LiNdP4O12 with C2v 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.
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
1991, 2(5): 401-402
[Abstract](193) [FullText HTML] [PDF 96KB](1)
Abstract:
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.
INTERACTION MECHANISM OF AMPHOTERIC COLLECTOR-I WITH METALLIC IONS AND MINERALS
Xu Xin SHAO , Meng Xiong GUO , K. Z. LIAO
1991, 2(5): 403-404
[Abstract](188) [FullText HTML] [PDF 88KB](1)
Abstract:
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
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
1991, 2(5): 405-406
[Abstract](188) [FullText HTML] [PDF 103KB](1)
Abstract:
This paper establishes a new model for calculation of the standard entropies of solid binary oxides as follows:S298θ=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.
THE ATOMIC WEIGHT OF INDIUM
Tsing Lien CHANG , Ying Kai XIAO
1991, 2(5): 407-410
[Abstract](181) [FullText HTML] [PDF 160KB](2)
Abstract:
Five samples of the indium material were examined for the isotopic abundance, and no variation was found. The isotopic ratio R191/193 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.
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
1991, 2(5): 411-414
[Abstract](183) [FullText HTML] [PDF 137KB](1)
Abstract:
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.
INFLUENCE OF SILVER-DOPING ON THE SUPERCONDUCTIVITY FOR YBa2Cu307-y
Jian MENG , Yu Fang REN , Man Zhi NIU
1991, 2(5): 415-418
[Abstract](197) [FullText HTML] [PDF 165KB](1)
Abstract:
The effect of substituting silver for barium on the structure and superconducting properties of YBa2Cu3O7-y has been studied. The structure of the silver-doping system (YBa2-xAgxCu3O7-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 Tc(R=0) decrease with increasing silver content. However, the critic current density Jc is found to be enhanced from 56.6 A/cm2 to 195 A/cm2
ISOLATION AND PURIFICATION OF METHANE IVf ONOOXYGENASE FROM METHYLOMONAS SPECIES GYJ3
Ai Min LIU , Shu Ben LI , De Xun MIAO , Wei Le YU , Fang ZHANG
1991, 2(5): 419-422
[Abstract](191) [FullText HTML] [PDF 145KB](1)
Abstract:
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.
Address:Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888
Powered By info@rhhz.net