1996 Volume 7 Issue 3

STUDIES ON CHIRAL THIOPHOSPHORIC ACIDS AND THEIR DERIVATIVES 13.THE ASYMMETRIC CYCLIZATION OF (+)-SUBSTITUTED CYCLOPENTANODIAMINE WITH O-ARYL THIOPHOSPHOROCHLORIDATES
Chu Chi TANG , Hui Fang LANG , Li Gong WU , Zheng Jie HE , Ru Yu CHEN
1996, 7(3): 205-206
[Abstract](56) [FullText HTML] [PDF 76KB](0)
Abstract:
The cyclizations of (+)-cis-1,2,2-trimethyl-1,3-diaminocyclopentane 1 derived from D-camphor with O-arylthiophosphorochloridates 2 give products,(+)-2,4,3-diazaphospha-bicyclo[3,2,1] octane 3,containing two unequal amounts of diastereoisomers,a pair of which (R=OEt) has been successfully separated by silica gel column chromatography.
SYNTHESIS AND CHARACTERIZATION OF NOVEL FUNCTIONAL HOST COMPOUNDS 1.MONO-(6-ANILINO-β-CYCLODEXTRIN)
Yu LIU , Yi Min ZHANG , Yun Ti CHEN
1996, 7(3): 207-210
[Abstract](53) [FullText HTML] [PDF 156KB](0)
Abstract:
A novel β-cyclodextrin derivative bearing mono-(6-anilino-β-cyclodextrin) (6-anilino-β-CD) was synthesized by a convenient method with 45% yield,and the host compound was characterized by 1H-NMR,FT-IR spectra and elemental analysis,etc.The spectral titrations have been performed in aqueous solution (pH=7.20) to give the stability constants and thermodynamic parameters for the supramolecular system formation of some amino acids with host compound.
A FACILE SYNTHESIS OF AZACROWN ETHERS WITH INTRAANNULAR PHENOLIC GROUPS IN A TWO-PHASE SYSTEM
Guo Ping XUE , Cheng Tai WU
1996, 7(3): 211-212
[Abstract](50) [FullText HTML] [PDF 66KB](0)
Abstract:
Azacrown ethers with intraannular phenolic groups are readily prepared by the reaction of 1,8-bis(p-tolylsulphonylamino)-3,6-dioxaoctane with 2,6-bis(bromomethyl)-4-R-anisole (R=CH3,Cl,Br) in a two-phase system of aqueous lithium hydroxide-toluene in the presence of Bu4 NI as phase transfer catalyst.
SYNTHESIS OF LIQUID CRYSTALS CONTAINING THE AZA-15-CROWN-5 UNIT
Wei ZHAO , Ming Gut XIE , Qing JIANG
1996, 7(3): 213-216
[Abstract](56) [FullText HTML] [PDF 114KB](0)
Abstract:
Two new aryl esters with the aza-15-crown-5 structural unit were synthesized.Their structures have been elucidated with IR,1HNMR,MS and elementary analysts.The determinations of DSC and textures have shown that both compounds possess room-temperature mesomorphic properties.
SYNTHESIS OF NEW UNSYMMETRICAL TETRADENTATE MACROCYCLES WITH sp2 AND sp3 NITROGEN DONOR SITES
jing Chao TAO , Yang Jie WU , Bin ZHAO , Han Zhen YUAN
1996, 7(3): 217-220
[Abstract](58) [FullText HTML] [PDF 174KB](0)
Abstract:
Five new unsymmertrical tetradentate macrocycles,incorporating sp2 and sp3 nitrogen as donor sites and with donor group-bearing side arms attached to the sp3 nitrogen atoms,were synthesized by an apropriate method.All of the macrocycles were identified by elemental analysis,IR,1H NMR and MS.
PALLADIUM-CATALYZED CARBONYLATION OF TERT-BUTYL ALCOHOL TO ESTERS OF ISO-VALERIC ACID
Hong Ying ZHOU , Shi Jie LU , Jing CHEN , Hong Xiang FU , Han Qing WANG
1996, 7(3): 221-224
[Abstract](62) [FullText HTML] [PDF 127KB](1)
Abstract:
tert-Butyl alcohol was carbonylated into iso-valeric esters in 37.0-83.6% yield with 42.4-95.0% selectivity using the Pd(OAc)2-PPh3-p-toluenesulfonic acid catalyst system without any halogen promoter or other extreme conditions.
A CONVENIENT APPROACH TO THE SYNTHESIS OF A BIOACTIVE CONSTITUENT OF THE HYPOXIS ROOPERI AND ITS HOMOLOGUE
Lin LIUa , Zhi Yang LIU , Jun Mei YU , Shu Xiang SHAN
1996, 7(3): 225-228
[Abstract](56) [FullText HTML] [PDF 115KB](0)
Abstract:
A bioactive constituent (E)-1,5-bis(3',4'-dimethoxyphenyl) pent-4-en-1-yne from the Hypoxis rooperi and its homologue,were conveniently synthesized through the copper (Ⅰ) catalyed coupling reaction of terminal alkyne under the solid-liquid phase transfer condition.
OXIDATIVE METHYLATION OF TOLUENE WITH METHANE OVER BASIC ZEOLITE CATALYSTS PROMOTED WITH ALKALI METAL OXIDES
Ling Ping ZHOU , Ke Yi TAO , Wei LI , Ming SU , He Xuan LI , Hideshi HATTORI
1996, 7(3): 229-232
[Abstract](58) [FullText HTML] [PDF 133KB](1)
Abstract:
The oxidative methylaion of toluene with methane to ethylbenzene and styrene proceeded over basic Y type zeolite catalyst at 1023K.KY was prepared from NaY raw powder by exchange with O.SM KOH aqueous solution at 363K.Loaded KY were prepared by impregnating aqueous solutions of LiNO3 and CsNO3 onto KY zeolite.Only KY zeolite showed very low C8-yield and selectivity.Addition of alkali-metal oxides to the KY zeolite increased greatly the catalytic activity.The Cs2O(6wt% Cs2O)/KY catalyst gave the highest C8 yield of 32.2% with selectivity of 60.9%.
ZEOLITE-CATALYZED FRIEDEL-CRAFTS ACYLATION OF AROMATICS:Ⅲ.SYNTHESIS OF 4-ACYL ANISOLE WITH USY CATALYST
Yu Dao MA , Qi Long WANG , Xing Dong JI , Chang Ming ZHONG , Qin QIU
1996, 7(3): 233-236
[Abstract](76) [FullText HTML] [PDF 151KB](2)
Abstract:
The synthesis with high yield of a series of 4-acyl anisole was performed through the Friedel-Crafts reaction of anisole with alkanoic or substituted benzoic acids in the presence of an ultrastable Y zeolite (USY) catalyst.
STELLADELIN D,A NEW CYCLIC UNDECAPEPTIDE FROM STELLARIA DELAVAYI
Yu Rui ZHAO , Jun ZHOU , Xian Kai WANG , Xiao Lin HUANG , Hou Ming WU , Chang Xiang CHENG
1996, 7(3): 237-240
[Abstract](58) [FullText HTML] [PDF 143KB](0)
Abstract:
Further chemical study on the fresh roots of Stellaria delavayi led to the isolation of another new cyclopeptide,namely stelladelin D.On the basis of spectroscopic analyses and chemical methods,its structure was assigned as cyclo(Gly-Val-Pro-Ser-Pro-Tyr-Phe-Pro-Ala-Ala-Ile).
THE STRUCTURAL ELUCIDATION AND ABSOLUTE CONFIGURATIONS OF TWO NEW POLYOXYGENATED CYCLOHEXENES FROM UVARIA GRANDIFLORA ROXB.
Xi Ping PAN , De Quan YU , Kuo Hsiung LEE
1996, 7(3): 241-244
[Abstract](55) [FullText HTML] [PDF 186KB](0)
Abstract:
Two new polyoxygenated cyclohexenes,named uvarigranol E(Ⅰ) and F(Ⅶ),were isolated from the rhizome of Uvaria grandiflora.On the basis of spectral analysis and chemical derivatizations, including preparation of Mosher esters,the structures of Ⅰ and Ⅶ were established as 1R-acetoxymethyl-1,2S-dihydroxy-3R,6S-dibenzoyloxy-cyclohex-4-ene and 1R-hydroxymethyl-1,2S-dihydroxy-3R,6S-dibenzoyloxy-cyclohex-4-ene.
STUDIES ON DOPAMINE RECEPTORS AND TETRAHYDROPROTOBERBERINES.Ⅱ.QUANTUM CHEMISTRY OF LIGAND-RECEPTOR INTERACTION
Yun TANG , Kai Xian CHEN , Hua Liang JIANG , Guo Zhang JIN , Ru Yun JI
1996, 7(3): 245-248
[Abstract](63) [FullText HTML] [PDF 159KB](0)
Abstract:
Based on the models of dopamine receptors and tetrahydroprotoberberine complexes,we carried out semiempirical quantum chemical calculations on the active sites of receptors and Iigands.The results showed that the frontier molecular orbitals of ligand and receptor just matched each other,which suggested that ligand and receptor might form charge-transfer interaction.
STUDIES ON DOPAMINE RECEPTORS AND TETRAHYDROPROTOBERBERINES.Ⅲ.3D-QSAR STUDY ON TETRAHYDROPROTOBERBERINES USING COMFA APPROACH
Yun TANG , Kai Xian CHEN , Hua Liang JIANG , Guo Zhang JIN , Ru Yun JI
1996, 7(3): 249-252
[Abstract](57) [FullText HTML] [PDF 156KB](0)
Abstract:
Using comparative molecular field analysis approach,the interaction of 17 tetrahydroprotoberberines to D1 receptor and 15 ones to D2 receptor have been studied by 3D-QSAR,respectively.The results indicated that the interactions of THPBs with dopamine receptors were primarily electrostatic interactions,with more positive charge in ligand and more negative in receptor.
3D-QSAR STUDY ON HUPERZINE A ANALOGS WITH MOLECULAR MODELING AND COMPARATIVE MOLECULAR FIELD ANALYSIS(COMFA) METHODS
Hua Liang JIANG , Kai Xian CHEN , Jian Zhong CHEN , Yun TANG , Qillg Mi WANG , Quan LI , Xu SHEN , Ru Yun JI
1996, 7(3): 253-256
[Abstract](55) [FullText HTML] [PDF 150KB](0)
Abstract:
On the basis of conformational search for ten huperzine A analogs according to the structure of AChE active site with our approach BCSPL,we performed a 3D-QSAR analysis for these compounds using molecular modeling and CoMFA method.The calculation results can be used to explain the relationship between the structure properties and the activities.
STUDY ON THERMAL AND HYDROTHERMAL STABILITY OF HETEROATOM MCM-41 MOLECULAR SIEVES
Nong Yue He , Rui Wang , Shu Lin Bao , Qin Hua Xu
1996, 7(3): 257-258
[Abstract](58) [FullText HTML] [PDF 103KB](0)
Abstract:
Five samples of SiMCM-41,AlSiMCM-41,FeSiMCM-41,LaSiMCM-41 and AlLaSiMCM-41 were synthesized and their good thermal stability was proved by TG/DTA and XRD.All the samples were thermal stable up to about 1150-1160 K.LaSiMCM-41 and FeSiMCM-41 showed better hydrothermal stability.
HYDROXYLATION OF PHENOL BY IRON(Ⅱ)-PHENANTHROLINE(PHEN)/MCM-41 ZEOLITE
Chi Biao LIU , Xing Kai YE , Yue WU
1996, 7(3): 259-262
[Abstract](53) [FullText HTML] [PDF 166KB](0)
Abstract:
MCM-41 zeolite and Iron (Ⅱ)-Phen/MCM-41 zeolite have been prepared and characterized by XRD,IR,NH3-TPD,BET and UV-Vis.The Iron(Ⅱ)-Phen/MCM-41 zeolite+30% H2O2 system is capable for catalyzing hydroxylation of phenol.
STRUCTURAL EVIDENCE FOR THE METAL ION BRIDGED LIGAND-LIGAND INTERACTION:THE X-RAY CRYSTAL STRUCTURE OF [(2,2'-BIPYRIDYL)(PHENYLMALONATE)COPPER(Ⅱ)] TRIHYDRATE
Qi Tao LIU , Xiang Dong ZHANG , Wei GUAN , Jin Yu SUN
1996, 7(3): 263-264
[Abstract](59) [FullText HTML] [PDF 101KB](0)
Abstract:
The crystal structure of the ternary complex [Cu(L)(2,2'-bipy)H2O]·2H2O (L=phenylmalonate) has been determined by X-ray diffraction methods.The copper(Ⅱ) center in five-coordinate square-pyramidal structure.It is of interest in this structure that the complex involves a metal ion bridge ligand-ligand aromatic ring stacking interaction.
SIMULATION CALCULATION FOR CHEMICAL SPECIATION OF LEAD BY FEEDBACK NEURAL NETWORK
Hua MO , Bo DENG
1996, 7(3): 265-266
[Abstract](58) [FullText HTML] [PDF 84KB](0)
Abstract:
The chemical speciations of Pb2+ in the aqueous solution can be calculated using a Feedback Neural Network.The effects of CO32-,random error and temperature on the simulation results were discussed.The results showed that CO32- in aqueous solution is an important affecting factor within 4 < pH < 9.
DETERMINATION OF BORON BY MICROWAVE PLASMA TORCH ATOMIC EMISSION SPECTROMETRY USING ON-LINE SEPARATION AND PRECONCENTRATION TECHNIQUE
Qun JIN , Han Qi ZHANG , Feng LIANG , Wen Jun YANG , Qin Han JIN
1996, 7(3): 267-268
[Abstract](62) [FullText HTML] [PDF 118KB](0)
Abstract:
In this paper boron was determined with on-line separation and preconcentration technique by microwave plasma torch atomic emission spectrometry (MPT-AES).Boron in steel samples was determined with satisfactory results.
CORRELATION BETWEEN THE CATALYTC PROPERTY AND Zr3+ ION FOR ZrO2 IN CO HYDROGENATION
Wen LI , Liang Bo FENG , Yuan Qi YIN
1996, 7(3): 269-270
[Abstract](76) [FullText HTML] [PDF 84KB](0)
Abstract:
In this letter the catalytic properties of zirconia in CO hydrogenation are presented.The catalylsts were prepared under different conditions.Some of them have good activity and selectivity for olefins,especially for isobutcne.The catalysts were characterized by EPR technique.The results showed that all good catalysts give an EPR signal at g=1.974 which canbe assigned to Zr3+ on the surface of ZrO2.The probable active center of ZrO2 catalyst was suggested.
INFRARED STUDIES OF LITHIUM OXYSULFIDE GLASSES
Hai Chun GAO , Chang Min SUN , Yan HUO , Zi JIN
1996, 7(3): 271-272
[Abstract](56) [FullText HTML] [PDF 92KB](0)
Abstract:
The FTIR spectra of the ternary Li2S-B2O3-LiBr oxysulfide glasses have been recorded.Assignment of main bands obtained in the spectra indicates the formation of so-called semithio-tetraborate groups and transformation to semi-thio-diborate groups with increasing Li2S content.
THE COLUMINESCENCE EFFECT OF RARE EARTH COMPLEXES IN LANGMUIR-BLODGETT FILMS
Guo Lun ZHONG , Ren Jie ZHANG , Kong Zhang YANG , Gui Yun ZHU
1996, 7(3): 273-274
[Abstract](65) [FullText HTML] [PDF 92KB](0)
Abstract:
The mixed multilayers of xEu(TTA)3Phen+(1-x)Gd(TTA)3Phen (x=0.5%,0.3% or 0.1%,in molar percentage)/Arachidic Acid=1/1 (in molar ratio) were fabricated by LB technique.The columinescence effect of rare earth complexes was observed and studied by detecting the fluorescence emission intensity of europium in the LB films.
STERIC EFFECT OF HYDROXY GROUPS ORTHO TO THE AZO-GROUP ON ANALYTICAL BEHAVIOR OF CHROMOGENIC REAGENTS
Hui Min MA , Yue Xian HUANG , Shu Quan LiANG
1996, 7(3): 275-278
[Abstract](55) [FullText HTML] [PDF 202KB](0)
Abstract:
Three new azo-reagents having different numbers of hydroxy groups ortho to the azo-group,i.e., 2-(2',4',6'-trihydroxyphenylazo)-, 2-(2',4'-dihydroxyphenylazo)-and 2-(4'-hydroxyphenylazo)benzenearsonic acid,were synthesized.Through comparative studies on the reactions of the three reagents with various metal ions,especially with iron(Ⅲ),it was found that not only selectivities but also sensitivities of azo-reagents can be improved by utilizing rationally the steric effect of groups ortho to the azo-group.The reasons for the improvements were discussed.
A NOVEL SPIRO-COMPOUND FROM CLERODENDRUM INDICUM
Jun TIAN , Qin Shi ZHAO , Zhong Wen LIN , Han Dong SUN
1996, 7(3): 279-282
[Abstract](61) [FullText HTML] [PDF 138KB](0)
Abstract:
From the aerial parts of Clerodendrum indicum,a novel spiro-compound,named cleroindicin A,was isolated and identified as 7-hydroxy-1-oxy spiro[3,5] nonane,on the basis of chemical convertion and 2D NMR techniques.
ESR DETECTION OF ACTIVE INTERMEDIATES PRODUCED BY VIOLOGENMEDIATED REDUCTION OF SUBSTITUTED NITROARENES
Fu Tian LIU , Ling Jun BAI , Hong LI , Bing Lin HE
1996, 7(3): 283-284
[Abstract](56) [FullText HTML] [PDF 87KB](0)
Abstract:
The active intermediates "substituted aniline radicals" were detected by ESR method during the reduction of substituted nitroarenes in the presence of methylviologen (MV2+) as electron-transfer catalyst (ETC).
PREDICTION OF STABILITY CONSTANTS FOR INCLUSION COMPLEXES OF β-CYCLODEXTRIN WITH SUBSTITUTED BENZENES BY ARTIFICIAL NEURAL NETWORKS
Qing Xiang GUO , Shuang Hui LUO , Hong WANG , Mao Sen ZHANG , You Cheng LIU
1996, 7(3): 285-288
[Abstract](63) [FullText HTML] [PDF 142KB](0)
Abstract:
The stability constants (Ka) for inclusion complexes of β-cyclodextrin (β-CD) with substituted benzenes were predicted by the Artificial Neural Networks (ANN).The stability constants obtained by ANN from the substituent molar refraction (Rmx),hydrophobic coefficient (πx) and Hammett constant (σx) are very close to those determined experimentally.It suggested that the van der Waals force and hydrophobic interactions play important roles in CD inclusion complex formation.
SYNTHESIS OF BENZO-15-CROWN-5 PHENOL-FORMALDEHYDE RESIN FOR LITHIUM ISOTOPE SEPARATION
YOU Heng SHI , Qun YAN , Duo Yuan WANG , Xiao Zhi ZHANG , Zhong Guo DENG , Hui Bao LU
1996, 7(3): 289-292
[Abstract](58) [FullText HTML] [PDF 154KB](0)
Abstract:
Four kinds of phenol-formaldehyde resins containing benzo-15-crown-5 ether were synthesized for lithium isotope separation.The adsorption capacity and isotope effect of Li+ in these resins have been investigated.Single separation factors 1.023~1.056 were obtained with batch method from isotope ratios,6Li+ and 7Li+ were enriched in the resin phase and liquid phase,respectively.
RELATIVE CONFORMER STABILITY OF OPEN-CHAIN PHOSPHANE:A PM3 STUDY
Fu Jiang DING , Liang Fu ZHANG
1996, 7(3): 293-296
[Abstract](62) [FullText HTML] [PDF 212KB](0)
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The geometry and the energy of conformers of PnHn+2(n=2-9) have been studied with PM3 method.It is concluded that gauche interaction between adjacent lone electron pairs and gauche interaction between P-H bond with adjacent P-P bond are important for predicting the stable conformer of open-chain phosphoanes.
SLOW PELLETING COAGULATION OF POLYMER LATEX EMULSION
Yun Ming LI , Mi Wen CHEN , Guo Jun XU , Su Hui OU , Kai WANG
1996, 7(3): 297-298
[Abstract](54) [FullText HTML] [PDF 96KB](0)
Abstract:
In this paper,slow pelleting flocculation of polymer latex consisting of butadiene,styrene and methyl methacrylate(MBS) were investigated,using aqueous H2SO4 as coagulant.It is found that spherical particles with uniform particle size and high bulk density were produced in the narrow range of pH.In order to obtain good particle morphology,well-distributed concentration,temperature and shear field in the coagulating system were required.
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