1991 Volume 2 Issue 4

THE SECONDARY REACTION IN THE CONDENSATION OF 1-METHYL-2-METHYLTHIO-IMIDAZOLINE WITH ACTIVE METHYLENE COMPOUNDS
Zhi Tang , HUANG Lu Hang
1991, 2(4): 267-268
[Abstract](171) [FullText HTML] [PDF 1009KB](1)
Abstract:
Mono-substituted heterocyclic ketene aminals are formed by the reaction of 1-methyl-2-methylthio-imidazoline with active methylene compounds containinq an acetyl or benzoyl group by the elimination of both a methylthio and an acyl group.This is resulted by the secondary reactio of the produced methanethiol to attack the more active carbonyl group.
A STUDY ON THE SELECTIVE REDUCTION OF AROMATIC AMIDE WITH LiAlH4
Ru Yu CHEN , Jian Wu WANG , Jing Jiang LIU , Gui Lin DUAN
1991, 2(4): 269-272
[Abstract](174) [FullText HTML] [PDF 125KB](1)
Abstract:
In the synthesis of l-phenyl-5-substituted amino-4-pyrazole N-alkyl amide,it was found for the first time that one of the two aromatic amido groups in the molecule of 1-phenyl-5-benzoyl amino-4-pyrazole N-alkyl amide was reduced selectively by LiAlH4.A new conclusion was drawn after several experiments have been done that ortho-amino(or substituted amino)aryl amide or the aryl amide with its ortho substituent which can be reduced into an amino group(or substituted amino group)can not be reduced by LiAlH4.It was further rationalized by quantum chemical calculation.
SYNTHESIS OF 2,2"-BIFLAVANONES
Yu Lin LI , Fang Jie ZHANG
1991, 2(4): 273-274
[Abstract](166) [FullText HTML] [PDF 75KB](2)
Abstract:
A new approach to the synthesis of 2,2″-biflavanones by the reductive dimerization of flavones is reported.The racemate and meso compounds of each bitlavanone have been separated and their structures have been determined on the basis of their spectral data.
THE REACTION OF AROMATIC ALDEHYDES WITH p-NITROBENZYLLIBUTYLTELLURONIUM BROMIDE BY PHASE TRANSFER CATALYSIS
Qi ZHONG , Jian Guo SHAO , Chang Qing LIU , Rong Jian LU
1991, 2(4): 275-276
[Abstract](154) [FullText HTML] [PDF 93KB](1)
Abstract:
Under the condition of solid-liquid phase transfer catalysis,olefins were obtained by the reaction of p-nitrobenzyldibutyltelluronium bromide with aromatic aldehyde.Under the condition of liquid-liquid phase transfer catalysis,however,different products were obtained due to the reactivity of different bases or aldehydes.
SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF 3,6-DISUBSTITUTED S-TRIAZOLO[3,4-b]-1,3,4-THIADIAZOLES
Zi Yi ZHANG , Xin CHEN
1991, 2(4): 277-278
[Abstract](180) [FullText HTML] [PDF 1108KB](1)
Abstract:
A series of 3,6-disubstituted s-triazolo[3,4-b]-1,3,4-thiadiazoles have been synthesized,whose structures were determined by elemental and spectral analyses;all the new compounds showed significant antibacterial activity.
THE PHOTOCHEMICAL SYNTHESIS OF THE PYRIDINE ADDUCT OF TETRAPHENYLPORPHYRINATORHODIUM(Ⅱ) AND THE MECHANISM OF PHOTOCHEMICAL REACTION
Jin Wang HUANG , Liang Nian JI , Yu Dong SU , He Zhcu WANG , A. K. Hsieh
1991, 2(4): 279-280
[Abstract](155) [FullText HTML] [PDF 123KB](1)
Abstract:
A new rhodium(Ⅱ) porphyrin complex was isolated by chromatography from the photochemical reaction of(μ—tetraphenylporphyrinato)bis[dicarbonylrhodium(Ⅰ)]with pyridine in benzene and has been characterized.From the results,the reaction mechanism is proposed.
A NEW ARTIFICIAL PHOTOSYNTHESIS COMPOUND FOR PHOTOELECTRIC CONVERSION
Xiang Dong WANG , Bao Wen ZHANG , Jian Wei BAI , Yi CAO , Xu Rui XIAO , Jing Mei XU
1991, 2(4): 281-284
[Abstract](167) [FullText HTML] [PDF 994KB](1)
Abstract:
A new triad model compound porphyrin-viologen-carbazole was synthesized to mimic photosynthesis.A mechanism including photoinduced electron transfer and two-step charge separation was suggested.This triad compound was easy to form LB film and rather high photodriven voltage and current were obtained with only one layer of LB film on the surface of SnO2 conductive glass.
A NEW BIFUNCTIONAL CHELATING AGENT α,ε-N,N'-BIS(L-CYSTEINYL)-L-LYSINE FOR RADIOLABELLING OF MONOCLONAL ANTIBODIES WITH TECHNETIUM-99M
Bi Zhong LI , Yuan Fang LIU , Yong Hui WU , Hua YE
1991, 2(4): 285-288
[Abstract](155) [FullText HTML] [PDF 154KB](1)
Abstract:
α,ε-N,N'-bis(L-cysteinyl)-L-lysine was synthesized and characterized for the first time.It was then employed as a bifunctional chelating agent to chelate technetium-99m and subsequently conjugated to fragment F(ab')2 of anti-gastric tumor monoclonal antibody 3G9.The radiolabelled antibody was satisfactorily stable and immunoreactive.
DCHA AS A NEW REAGENT FOR THE ESTERIFICATION OF OBSTINATED AMINO ACIDS BY THE MERRIFIELD'S RESIN
De Xin WANG , Gui Shen LU
1991, 2(4): 289-290
[Abstract](179) [FullText HTML] [PDF 90KB](1)
Abstract:
The obstinated amino acid,Boc-Asn(or Boc-Gln),was directly anchored onto the Merrifield's resin using DCHA as the base in present reaction.The yield(71.88%)of Boc-Asn-OCH2-resin was much better than those(0-33.5%)using Cs2CO3,KOH,KF.DEA and TEA as the base.which are efficient reagents for other amino acids in the same reaction.
STUDIES ON THE CHEMICAL CONSTITUENTS OF CLAUSENA LANSIUM(LOUR.)SKEELS Ⅲ.The structural elucidation of homo-and zeta-clausenamide(1)
Ming He YANG , Yan Yong CHEN , Liang HUANG
1991, 2(4): 291-292
[Abstract](179) [FullText HTML] [PDF 905KB](1)
Abstract:
The structures of two novel lactams isolated from Clausena lansium were elucidated mainly on the bases of their spectral data.They are homoclausenamide(1),a δ-lactam,and zetaclausenamide(4),an eight-membered ring lactam.
DITERPENOIDS FROM RABDOSIA SCULPONEATA
Rong Pin ZHANG , Hong Jie ZHANG , Yu Lin ZHEN , Han Dong SUN
1991, 2(4): 293-296
[Abstract](168) [FullText HTML] [PDF 126KB](1)
Abstract:
Five ent-6,7-seco-karuene diterpenoids-enmein,epinodosin,sculponeatin A,C,D,were isolated from the dried leaves of Rabdosia sculponeata. One of the compounds,named sculponeatin D,was previously unreported.Its structre was elucidated by the spectral data including 2D COSY,1H-13C correlation,2D NOESY spectroscopy.
AMSOSININE,A NEW INDOLE ALKALOID FROM AMSONIA SINENSIS
Hong Mei LIU , Xiao Zhang FENG , Bin WU , Qi Tai ZHENG
1991, 2(4): 297-298
[Abstract](160) [FullText HTML] [PDF 95KB](1)
Abstract:
Amsosinine,a new indole alkaloid was isolated from Amsonia sinensis.Its structure and relative configuration have been determined by detailed spectral studies.The X-ray crystal structure analysis further confirms our assignments.
NEW SAPONIN MUSSAENDOSIDE M FROM MUSSAENDA PUBESECUS
Jun Ping XU , Zi LUO , Jie Ying DONG , Ren Sheng XU , Hou Ming WU
1991, 2(4): 299-300
[Abstract](186) [FullText HTML] [PDF 88KB](1)
Abstract:
The structure of a new saponin mussaendoside M obtained from Mussaenda pubesecus was identified by FAB-MS and 2D-NMR spectroscopy
PRZEWALSKINIC ACID A,A NEW PHENOLIC ACID FROM SALVIA PRZEWALSKII MAXIM
ue Zhao LU , Wen Hao XU , Jia Xiang SHEN , Hideo NAOKI
1991, 2(4): 301-302
[Abstract](166) [FullText HTML] [PDF 60KB](1)
Abstract:
From the root of Salvia przewalskii Maxim.a new phenolic acid,przewalskinic acid A was isolated and the structure was established by the analysis of 13C-NMR,1H-NMR and two-dimensional COSY experiments.
FORMATION OF PROPYLENE OXIDE BY METHYLOMONAS GYJ3 IN A GAS-SOLID BIOREACTOR
Shu Ben LI , Can Zhu GAO , Ai Min LIU
1991, 2(4): 303-306
[Abstract](158) [FullText HTML] [PDF 142KB](1)
Abstract:
Present paper deals with propylene oxide production from propylene utilizing Methylomonas sp.GYJ3 immobilized by adsorption or gel entrapment in a continuous gas flow packed bed bioreactor.The regeneration of biocatalyst in situ is also discussed.
THREE NEW ACETYLATED METABOLITES OF EPHEDRINES DETECTED IN URINE
Jian Fang CUI , Tong Hui ZHOU
1991, 2(4): 307-308
[Abstract](175) [FullText HTML] [PDF 84KB](1)
Abstract:
Three new metabolites(N-acetyl-pseudoephedrine,N-acetyl-norpseudoephedrine and N,O-diacetylnorpseudoephedrine)of ephedrines were diected and confirmed by GC/MS method and chemical derivatization.The metabolic pathway of acetylation of hydroxyl group is reported for the first time.
A COMBINED MEASUREMENT SYSTEM FOR UV/V IN SITU SPECTROELECTROCHEMICAL STUDY
Jin LUO , Zhong Hua LIN , Zhao Wu TIAN
1991, 2(4): 309-312
[Abstract](158) [FullText HTML] [PDF 147KB](1)
Abstract:
A microcomputer-based UV/V in situ spectroelectrochemical measurement system has been developed.This paper presents a description of the experimental details regarding the methods and equipment.
SELECTIVE SULFUR DIOXIDE DETERMINATION BY GAS DIFFUSION FLOW INJECTION ANALYSIS WITH CHEMILUMINESCENT DETECTION
Yong He BAO , Qi Jun SONG
1991, 2(4): 313-314
[Abstract](163) [FullText HTML] [PDF 107KB](1)
Abstract:
Sulfur dioxide has been found to decrease the chemiluminescence of luminol-iodine system.A new determination method for sulfur dioxide in atmosphere is developed by applying this reaction to a flow injection gas diffusion separation system.This permits the determination of sulfur dioxide selectively and rapidly.
TRIPLY BRIDGED BINUCLEAR COMPLEX OF OXOMOLYBDENUM(Ⅴ)WITH MERCAPTOPHENOLATE LIGANDS
Ling Hong WENG , Xue Tai CHEN , Yong Han HU , Bei Sheng KANG
1991, 2(4): 315-316
[Abstract](162) [FullText HTML] [PDF 906KB](1)
Abstract:
Reaction of(n-Bu4N)xNa4-x[a-Mo8O26](x=1-4)and mpH2(mpH2=o-mercaptophenol) leads to the formation of compound(n-Bu4N)[Mo2O3(mp)3Na(EtOH)2(MeOH)],It crystallizes in the space group P21/n with four molecules per unit cell.The cell dimension is a=12.776(3),b=14.154(5),c=26.281(7) Å,β=95.50(2)°,V=4730.5Å3,dc=1.407g/cm3.Full-matrix refinement of 496 parameters on 3348 reflection data gave final R(Rw)value of 0.072(0.072).The two oxomolybdenum-mercaptophenolate,units are triply bridged by an inorganic oxygen atom and a doubly bridging mp2-ligand.
STUDY ON THE STRUCTURES OF COORDINATION COMPOUNDS OF N-(ortho-METHYL)-AND N-(ortho-METHOXY)-PHENYL IMINODIACETATO-Cu(II)
Yun Ti CHEN , Heng Qian LIU , Jing Jiang LIU , Xian He BU , Jin Ling WANG , Li Juan ZHANG , Fang Ming MIAO
1991, 2(4): 317-320
[Abstract](175) [FullText HTML] [PDF 1632KB](1)
Abstract:
The coordination compounds,{Cu[CH3C6H4N(CH2COO)2]}·2H2O and {Cu[CH3OC6H4N(CH2COO)2]}·2H2O,have been prepared and its crystal structures determined.The final discrepancy factors are R=0.052,Rw=0.061 for(I)and R=0.052,Rw=0.039 for(Ⅱ).The geometry of the coordination polyhedron with Cu(Ⅱ)is a distorted tetragonal pyramid for(Ⅰ)and an unsymmetrical and extended tetragonal bipyramid for(Ⅱ),respectively.The results of EHMO calculations indicate that the ligand mainly provided the field with very few of its electrons being coordinated to the central atom.
PARACRYSTAL STRUCTURE PARAMETERS STUDIES IN LDPE/EPO BLENDS WITH VARIANCE-RANGE FUNCTION METHOD
Huan GAO , Bao Quan YANG , Zhi Shen MO , Zhong Cheng HU
1991, 2(4): 321-322
[Abstract](178) [FullText HTML] [PDF 79KB](1)
Abstract:
X-ray diffraction line profiles of low density polyethylene(LDPE)/(ethylene-propylene-octene-1)copolymer(EPO) blends have been analyzed with variance range function method.Theories for determining the microparacrystallite size and the distortion parameter from single reflection have been described,and the value of these two parameters at(110)and(200)directions have been determined.
THE DEGREE OF CRYSTALLINITY OF MULTICOMPONENT POLYMERS BY X-RAY DIFFRACTION ANALYSIS
Zhi Shen MO , Bao Quan YANG , Hong Tang ZHANO
1991, 2(4): 323-324
[Abstract](165) [FullText HTML] [PDF 66KB](1)
Abstract:
Based on the X-ray scattering intensity theory,the correction factors of the degree of crystallinity formulae of the multicomponent polymers have been clearly defined.The formula of degree of erystallinity of the multicomponent polymers was derived in terms of the WAXD theory ahd improved graphic multipeak resolution methods.The results calculated are compatible with the density measurement.
THE WREATH PRODUCT GROUP FOR NMR SPECTRA ANALYSES OF MOLECULA WITH S4[S2]SYMMETRY
Wei Liang ZHOU , Xiao Chun HE , Yong Ren HUANG
1991, 2(4): 325-328
[Abstract](177) [FullText HTML] [PDF 133KB](1)
Abstract:
This paper presents a character table of S4 wr S2 wreath product group.Using this character table,1H or 13C NMR spectra analysis of molecula with S4[S2]symmetry,especially simplification of the secular determinant equation will be easy to carry out.Molecules with S4[S2]symmetry,are exemplified by octaphenylcyclotetrasiloxane and 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine chromium(Ⅲ)chloride.
A NOVEL OPTICALLY TRANSPARENT THIN LAYER ELECTRODE FOR IN SITU IR SPECTROELECTROCHEMISTRY
Yi Jin XIAO , Han Xi YANG , Chuan Sin CHA , Zi Gang FENG , Hua TONG
1991, 2(4): 329-330
[Abstract](150) [FullText HTML] [PDF 88KB](1)
Abstract:
A novel design of IR OTTLE is shown to have sufficient sensitivity and experimental simplicity for obtaining IR spectra of the species generated during electrochemical oxidation-reduction.
SYNTHESIS AND CHARACTERIZATION OF ZEROVALENT PALLADIUM COMPLEXES
Zhen Feng XI , Rui Na YANG , Dou Man JIN
1991, 2(4): 331-334
[Abstract](142) [FullText HTML] [PDF 156KB](1)
Abstract:
A series of nine Pd(0)complexes(L)Pd(L')[L=bis(diphenylphosphino)methane(dppm),1,2-bis(diphenylphosphino)ethane(dppe),and 1,1'-bis(diphenylphosphino)ferrocene(dppf),respectively;L=dibenzylideneacetone(dba),2,3,5,6-tetrachloro-1.4-benzoquinone(q)and 2,3-dichloro-1,4-naphthoquinone(nq)]were synthesized and characterized by means of elemental analyses,IR,UV,1H-NMR and 31P-NMR spectra.The redox wave peak potentials of the ferrocenyl group of complexes with dppf were measured by using CV method.Results showed that all the diphosphorus ligands behaved as chelating bidentate ligand and dba,q,nq were coordinated to the Pd(0)atom through their C=C moieties,not their carbonyl ones.Analytical data also showed that there were interactions between the two different ligands in each complex.
SYNTHESIS AND STRUTURE OF THE FIRST INTERSTITIAL μ7-S CLUSTER Co77-S)(μ4-PSEt)(μ-SEt)2(μ-CO)2(CO)12
Shu Tang LIU , Xiang HU , Qi Wang LIU , Wen Tao ZHANG
1991, 2(4): 335-338
[Abstract](167) [FullText HTML] [PDF 119KB](1)
Abstract:
The reaction of Co2(CO)8 with EtSPCl2 gives a new crystal like compound Co77-S)(μ4-PSEt)(μ-SEt)2(μ-CO)2(CO)12,whose structure has been determined by single crystal x-ray diffraction.This special compound reveals some new features in cluster chemistry1:The fragmentation of a ligand precursor EtSPCl2 yieldsthree kinds of fragments,μ7-S,μ4-PSEt and μ-SEt,which are ligands in the same cluster molecule.There is a new type of bridging S presented——A μ7-S atom is interspaced into seven Co core.
SOLID-LIQUID PHASE TRANSFER AND COBALT OR PALLADIUM COMPLEX CATALYZED SYNTHESIS OF ANHYDRIDES FROM ACYL CHLORIDES
Jin Xian WANG , Chin Hsien WANG , Yu Lai HU , Wen Feng CUI
1991, 2(4): 339-342
[Abstract](161) [FullText HTML] [PDF 142KB](1)
Abstract:
Acyl chloride can efficiently be converted into anhydride under solid liquid phase transfer catalysis by using bis(triphenylphosphine) cobalt dichloride or bis(triphenylphospine)palladium dichloride as the catalyst.
THE ELECTROSTATIC POTENTIAL METHOD APPLIED TO THE KINETICS OF INTERMOLECULAR ELECTRON TRANSFER IN PHOTOELECTRIC CONVERSION
Xuan CAO , Mu Zhen LIAO , Xian Zhang GU , Lin Feng LI , Guo Shi WU
1991, 2(4): 343-344
[Abstract](160) [FullText HTML] [PDF 97KB](1)
Abstract:
A thorough investigation have been first carried out on the electron transferring between molecules by using the ab initio electrostatic potential method.By this method,we made a theoretical estimation of the energy barrier that electrons tunnel when they move from one molecule to another.The results show that for two molecules very close to each other the height of the barrier goes down exponentially with a decreasing intermolecular distance.Substituting groups have effect on the height of the barrier.The photoelectric current produced in a simulative system has also been theoretically predicted.
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