1994 Volume 5 Issue 7

SYNTHESIS OF (4S)-ETHOXYSILATRANE-4-CARBOXYLIC ACIDS
Zheng Rong LU , Chun Yuan TAO , Ren Xi ZHUO
1994, 5(7): 549-550
[Abstract](207) [FullText HTML] [PDF 80KB](0)
Abstract:
(4S)-1-Ethoxysilatrane-4-carboxylic acid and (4S)-1-ethoxy-3-methylsilatrane-4-carboxylic acid were synthesized from the reaction of triethoxysilane with L-N,N-bis(2-hydroxyethyl) serine or L-N,N-bis(2-hydroxyethyl) threonine in the presence of pyridine.
SEMI-SYNTHESIS OF TRIPTONIDE
Peng Cheng MA , Wei YAN
1994, 5(7): 551-552
[Abstract](186) [FullText HTML] [PDF 76KB](0)
Abstract:
A compound,triptonide showed an antifertility activity,has been semi-synthesized from triptolide in 97% yield with chromic acid in one step.
THE SYNTHESIS OF 3',4'-ALKYLENEDIOXY-ISOFLAVONE ANALOGS
Ling Hua CAO
1994, 5(7): 553-554
[Abstract](183) [FullText HTML] [PDF 71KB](0)
Abstract:
Eleven new isoflavonoid derivatives which contain 3',4'-methylenedioxy,3',4'-ethylenedioxy,and 3',4'-trimethylenedioxy groups were synthesized.The structures of new compounds were confirmed by elemental analysis and 1H-NMR data.
SYNTHESIS OF 1-O-ALKYL-2,3,4-TRI-O-BENZOYL-β-D-RIBOFURANOSE
Bai Yu YANG , Zhan Jiang Li , Meng Shen CAI
1994, 5(7): 555-556
[Abstract](181) [FullText HTML] [PDF 65KB](0)
Abstract:
1-O-Acetyl-2,3,4-tri-O-benzoyl-β-D-ribofuranose reacted with alcohols or phenols in the presence of trimethylsilyl trifluoromethanesulfonate(TMSOTf) and molecular sieve (4Å) to give good yields of 1-O-alkyl-2,3,4-tri-O-benzoyl-β-D-ribofuranose.
NEW HETEROCYCLIC SYSTEM SYNTHESIS VI. THE CYCLOADDITION DERIVATIVES OF 1,5-BENZOTHIAZEPINE AND 1,5-BENZODIAZEPINE
Jia Xi XU , Sheng JIN
1994, 5(7): 557-560
[Abstract](194) [FullText HTML] [PDF 174KB](0)
Abstract:
2,3-Dihydro-1H-1,5-benzodiazepines and 1-benzoyl-2,3-dihydro-1H-1,5-benzodiazepines react with,α-carbonylketenes,generated from 2-diazo-1,3-diphenyl-1,3-propandione or 2-diazo-1-phenyl-1,3-butandione by heating,to give 4a,5,6,12-tetrahydro-1H,7H-1,3-oxazino[3,2-d] [1,5]-benzodiazepine-1-ones,a new ring system.2,3-Dihydro-1H-1,5-benzodiazepines also afford adducts of H-N bond with α-carbonylkelenes,2-aryl-1-(2-benzoyl-phenylacetyl)-4-phenyl-2,3-dihydro-1H-1,5-benzodiazepines.Addition of benzonitrile N-phenylimine,yielded in situ from the N-phenyl benzenecarbohydrazonic chloride,to 2,4-diaryl-2,3-dihydro-1,5-benzothiazepines and 1H-1,5-benzodiazepine gave 3a,5-diaryl-1,3-diphenyl-3a,4,5,11-tetrahydro-3H-1,2,4-triazolo[4,3-d] [1,5]benzothiazepine and 3H,6H-1,2,4-triazolo[4,3-d] [1,5]benzodiazepine,respectively.
DIRECT FORMATION OF TETRAQUINANE SKELETON BY INTRAMOLECULAR ARENE-OLEFIN meta-CYCLOADDITION
Cong ZHANG , Song Fu WU , Xiao chuan GUO
1994, 5(7): 561-562
[Abstract](207) [FullText HTML] [PDF 86KB](0)
Abstract:
The photoinduced intramolecular arene-olefin meta-cycloaddition was used as a key step in the synthesis of crinipellin ring skeleton.The structures of the photo products were established by 1H,13C-NMR method.
STUDIES ON THE SYNTHESIS OF SINULARIOL-D, SINULARIOL-A AND SINULARIC ACID-A.-SYNTHESIS OF (5R)-7,7-DIMETHOXY-5-[1-(2-TERT-BUTYLDIPHENYLSILOXYMETHYL)VINYL]-2-HEPTANONE
Xiang Jun YUE , Yu Lin LI
1994, 5(7): 563-564
[Abstract](216) [FullText HTML] [PDF 68KB](0)
Abstract:
An efficient synthesis of (5R)-7,7-dimethoxy-5-[1-(2-tert-butyldiphenylsiloxymethyl)vinyl]-2-heptanone,a key intermediate in the synthesis of antitumor cembrane type sinuiariol-D,sinularial-A and sinuiaric acid-A isolated from the soft coral Sinularin moyi was first described from (R)-limonene.
STUDIES ON ORGANOPHOSPHORUS COMPOUNDS 88 A NOVEL SYNTHESIS OF 3,4-DIHYDRO-2H-PYRROLE-2-PHOSPHNATE
Cheng Ye YUAN , Wei Sheng HUANG
1994, 5(7): 565-566
[Abstract](222) [FullText HTML] [PDF 97KB](0)
Abstract:
Cu2O-catalyzed cycloaddition of 1-isocyanoalkylphosphonate to electron-deficient olefins gave 3,4-dihydro-2H-pyrrole-2-phosphonates.
CATALYTIC ASYMMETRIC EPOXIDATION OF α-FURFURYLAMINE IN THE PRESENCE OF MOLECULAR SIEVE AND CaH2
Zhi Hui LU , Xue You ZHU , Wei Shan ZHOU
1994, 5(7): 567-568
[Abstract](200) [FullText HTML] [PDF 103KB](1)
Abstract:
The modified procedure of the catalytic asymmetric epoxidation of the α-furfurylamines (dl)-1a-d in the presence of molecular sieve and CaH2 provides the slow-reacting enantiomers (S)-1a-d and the fast-reacting enantiomers (2R.6S)-2a-d in high enantioselectivity and high chemical yield.
SELECTIVE HYDROGENATION OF PHENOL OVER A SILICA SUPPORTED POLYTITAZANE-Pt-Mn BIMETALLIC COMPLEX
Chun Wei CHEN , Mei Yu HUANG , Ying Yan JIANG
1994, 5(7): 569-572
[Abstract](193) [FullText HTML] [PDF 172KB](0)
Abstract:
A new kind of inorganic polymer silica-supported polytitazane (Ti-N),and its platinum-manganese bimetallic complex (Ti-N-Pt-Mn)were prepared.The activity and selectivity to cyclohexanone in the hydrogenation of phenol over Ti-N-Pt-Mn can be affected by Pt/Mn molar ratio in the complex,reaction temperature and solvent etc.
CONVERSION OF UNSATURATED LONG-CHAIN FATTY ACIDS TO 10-HYDROXY FATTY ACIDS BY RESTING CELLS OF Nocardia sp.
Wei Hang CHAI , Zu Yi Li
1994, 5(7): 573-576
[Abstract](201) [FullText HTML] [PDF 150KB](0)
Abstract:
Resting cells of Nocardia sp.were used to convert a series of unsaturated long-chain fatty acids to 10-hydroxy fatty acids.Structures of all metabolites were suggested by 1H nuclear magnetic resonance and by infrared and mass spectrum.The results showed that the hydroxylation stereospecificity happened at the cis-9 double bond with other position unaffected.
STUDIES ON THE REACTIVITY OF CYCLOAROMATIZATION REACTION VIA a-OXO KETENE DITHIOACETALS
Qun LIU , Zhi Ling WANG , Shu Jia ZHANG , Zhi Yun YANG
1994, 5(7): 577-580
[Abstract](162) [FullText HTML] [PDF 143KB](0)
Abstract:
The dihydric dithioketenes 3a-c obtained by 1,2-addition of methallyl Grignard reagent to bis(alkylthio) methylidene derivatives of dimedone 2a-c were converted to the cycloaromatization product 4 assisted by boron trifluoride etherate.When this reaction was performed in methanol,the substitution-cycloaromatization product 5 was obtained as by-product from 3c.To this cycloaromatization reaction,the reactivity order dimethylthio > 1,3-propylenedithio > 1,2-ethylenedithio carbon cation was established by the yields from 3a-c to 4.An intramolecular a1,a1 reaction pattern was developed by experiment.
DICHLORODIMETHYLSILANE-A USEFUL REAGENT FOR THE CLEAVAGE OF PEPTIDYL WANG RESIN
De Xin WANG , Ying SUN , Gui Shen LU , Qing Chai Xu
1994, 5(7): 581-584
[Abstract](215) [FullText HTML] [PDF 104KB](2)
Abstract:
In present study,an organic compound,DDSi,was found to cleave peptidyl Wang-resin linker efficiently.The yields and purities of free peptides were comparable with products released by TFA,the conventional procedure.
BOND LENGTHS OF BUCKY-BALLS C60, C240, C540, AND C960
Lei LIU , Kai Tai CHEN , Yu Fen LI
1994, 5(7): 585-586
[Abstract](193) [FullText HTML] [PDF 83KB](0)
Abstract:
Based on an empirical potential,we have performed calculations of bond lengths of bucky-balls C60, C240, C540, AND C960.Bond length of a monolayer graphite,conridered as an extremely large bucky-ball,has also been calculated.The calculated bond length monotonously decreases with increaring bucky-ball rize,and smoothly connects with the corresponding value of the monolayer graphite.
THE BINDING OF CATIONIC CARBOCYANINE TO THE SILICON SURFACE BY HALOGENATING ALCOHOLYSIS AND THEIR PHOTOEIECTRIC PROPERTIES
Ji Xiang HAO , Ji Xian GU , Zu Xun ZHANG , Zi Xiang CAO
1994, 5(7): 587-590
[Abstract](195) [FullText HTML] [PDF 136KB](0)
Abstract:
Two cationic carbocyanine were bound to the Si surface through halogenating alcohoiysis,which are characterized by SERS and XPS techniques.The measurement of spectral response and surface photovoltage of dye-bonded Si wafers indicates that Si can be sensitized by bond-dyes,and the Si-dyes have photovoltaic effect.
A NOVEL SESQUITERPENE FROM CREMANTHODIUM ELLISII KITAM
Hao CHEN , Li YANG , Zhong Jian JIA
1994, 5(7): 591-592
[Abstract](206) [FullText HTML] [PDF 79KB](3)
Abstract:
A novel sesquiterpene (1) was isolated from Cremanthodium ellisii Kitam.The structure was elucidated by spectroscopic methods and 2D-NMR techniques.
THREE NEW FUROCOUMARINS FROM NOTOPTERYGIUM INCISUM TING
Yong Qing XIAO , Xiao Hong LIU , You Fu SUN , Kimiye BASA , Masahiko TANIGUCHI , Mitsugi KOZAWA
1994, 5(7): 593-596
[Abstract](220) [FullText HTML] [PDF 126KB](0)
Abstract:
From the EtOAc extract of the underground part of notopterygium incisum Ting.,three new furocoumarins,5-[(2E)-3,7-dimethyl-5-ethyloxy-2,6-octadienyloxy]psoralen named ethylnotopterol (A),5-[(2E,5E)-3,7-dimethyl-7-[(1-ethyloxy)-2,5-octadienyloxy]psoralen named notoptolide (B) and 5-[(2E)-3,7-dimethyl-5,6-epoxy-2,7-octadienyloxy]psoralen named anhydronotoptoloxide (C),were isolated.
MONITORING ELECTROLYTIC REACTION OF NUCLEAR FAST RED BY HIGH PERFORMANCE CAPILLARY ELECTROPHORESIS
Xiao Hong FANG , Tao ZHU , Dong Mei , QIANG , Yi Liang SUN
1994, 5(7): 597-600
[Abstract](200) [FullText HTML] [PDF 121KB](0)
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A specific example is given to show that high performance capillary electrophoresis can serve as a simple and effective method for the moniforing of an electrochemical oxidation reaction of nuclear fast red.
FLOW-THROUGH ELECTROCHEMICAL MEASUREMENT SYSTEM FOR STUDYING PHOTOGENERATED SPECIES
Jin LUO , Lian Yong SU , Zhong Hua LIN , Hua Shui LIN
1994, 5(7): 601-602
[Abstract](186) [FullText HTML] [PDF 93KB](0)
Abstract:
A flow-through electrochemical measurement system for detecting photogenerated species in solution has been developed.The minimal detecting limit of species life-time can reach 0.1ms in this measurement system.The result of TiO2 electrode showed that the system was reliable and convenient.
SYNTHESIS AND 183W,51V NMR CHARACTERIZATION OF α-[GaW9V8O40]5- HETEROPOLYANION
Xiao Peng ZHAN , Jing Fu LIU
1994, 5(7): 603-604
[Abstract](195) [FullText HTML] [PDF 88KB](0)
Abstract:
The trivanadium-substituted heteropolytungstates have been synthesized from their lacunary precursor α-Na9GaW9O40H2.183W NMR spectrum of the title anion consists of two lines as expected for the Cav structure of the trisubstituted A-type Keggin anion.
THEORETICAL STUDY OF DIATOMIC AND TRIATOMIC SYSTEMS OF COPPER CLUSTER
Han Xing LIU
1994, 5(7): 605-608
[Abstract](212) [FullText HTML] [PDF 159KB](0)
Abstract:
The optimized geometries and the electronic structures of Cu2 and Cu3 were studied by DV-Xα method.The result shows the bond length of the diatomic system is 2.50 Å which has a little difference with the experiment but it is in agreement with other theoretical methods such as CI,RESCF.In this investigation we find two nearly-degenerate candidates for the ground state of triatomic system,that the linear geometry state is slightly more stable than the bent isosceles triangular structure(2B2).The result is in good agreement with the ESR spectroscopy obtained by Howard.The difference of energy levels of diatomic system was calculated for the measurement of the orbital interactions of the Cu(4s) and Cu(3d).The total densities of the states of triatomic system are presented to show the electronic structure varying with angle 2θ.
THE GEOMETRY AND ORBITAL INTERACTIONS OF TRIATOMIC CLUSTERS OF Cu, Ag,Au (I)
Han Xing LIU
1994, 5(7): 609-612
[Abstract](206) [FullText HTML] [PDF 151KB](0)
Abstract:
In this paper,the total energies and the density of the states of triatomic systems of Cu.Ag.and Au were calculated by discret-variational Xα method.Furthermore,the optimized geometry of triatomic copper,silver,and gold clusters were obtained.The results showed that the optimized geometry of Cu3 was different from that of Ag3.and Au3.Cu3 cluster has two nearly-degenerate candidates for the ground state.Ag3 and Au3 clusters have bent isosceles triangular structure only.The ground configuration for the triatomic clusters is 7a125b21,and the ground state is 2B2.The present evidences are in agreement results with the experimental and with those by other complex theoretical method.
STUDIES ON THE SOLID STATE REACTIONS OF COORDINATION COMPOUNDS: LXIX STEPWISE REACTION OF CuCl2.2H2O WITH 2,2'-BIPYRIDYL
Li Xu LEI , Xin Quan XIN
1994, 5(7): 613-614
[Abstract](200) [FullText HTML] [PDF 88KB](0)
Abstract:
Consecutive reaction between two solids,CuCl2.2H2O and 2,2'-bipyridyl in 1:2 molar ratio proceed in two steps:the salt first converts to the mediate,then the mediate turns to the final product.
EVIDENCE FOR THE NOVEL COORDINATION MODE OF TERMINAL GROUP OF SOME TAILED PORPHYRIN IRON(Ⅱ) COMPLEXES
Xiang Dong JIAO , Jin Wang HUANG , Jun Fen LIU , Ling Nian JI
1994, 5(7): 615-616
[Abstract](209) [FullText HTML] [PDF 127KB](0)
Abstract:
EPR spectra were measured at 77K for two tailed porphyrin iron(Ⅲ) complexee,5-[o-(1-imidazolyl)butaxyl]phenyl-10,15,20-triphenylporphyrinatairon(Ⅲ) chloride[Mo-ImBPTPPFe(Ⅲ)Cl]and δ-[p-[4-(m-pyridyloxy)butoxyl]phenyl]-10,16,20-triphenylporphyrinatoiron(Ⅲ)chloride[p-PyBPTPPFe(Ⅲ)Cl,and their adducts with imidazole or pyridine,the crystal field parameters of these adducts were calculated from g values.The 1H NMB and visible spectra of these adducts are compared with each other.Form these data,the novel coordination mode of terminal imidaxole in o-ImBPTPPFe(Ⅲ)Cl system were identified.
SYNTHESIS OF A NEW JON PAIR COMPLEX CONTAINING MOLYBDENUM (V) AND SAMARIUM(Ⅲ)
Chun Ting SUN , Ya Bin ZHU , Qing Hong FU , Xun LIU , Shu Zhen YI
1994, 5(7): 617-618
[Abstract](195) [FullText HTML] [PDF 72KB](0)
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A new ion-pair complex[Mo(dtc)4] [Sm(dtc)4]was synthesized here.Its molecular structure and crystal structure was determined through X-ray Diffraction method.
ELECTRODEPOSITION OP Ba-K-Bi-O AND Ba-K-M-Bi-O (M=Rb, Pb AND La) SINGLE CRYSTALS
Liang Zhong ZHAO , Jin Biao ZHANG , Wei Hua WANG , Shi Hong LIU , Dao Ben ZHU , Bo YIN , Jin Wei LI , Zhong Xian ZHAO
1994, 5(7): 619-622
[Abstract](225) [FullText HTML] [PDF 113KB](0)
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Ba-K-Bi-O and Ba-K-M-Bi-O(M=Rb,Pb and La) single crystals were prepared using the eleotrocrystallization method.Ihe resulting crystalline materials were characterised by XPS,XRD and magnetic method.
THE PHOTOVOLTAIC PROPERTIES OF NANOCRYSTALLINE Nd2O3
Yi CUI , De Jun WANG , Bao Hui WANG , Tie Jin LI , Xiang Ting DONG , Guang Yan HONG
1994, 5(7): 623-626
[Abstract](202) [FullText HTML] [PDF 164KB](0)
Abstract:
The behavior of light-induced charge transfer and photovoltaic properties of nanocrystalline Nd2O3 were investigated with SPS and FMSPS.It was found that the SPS shows two peaks at 330 nm(P1)and 380 nm(P2)in the UV-vis range.The observed spectral features can be explained in terms of charge transfer and interband transition.
ELECTROCHEMICAL FABRICATION AND PHOTOVOLTAIC PROPERTY OF SIZE-QUANTIZED NANOCRYSTALLINE CdS FILMS
Bao Hui WANG , De Jun WANG , Yi CUI , Dong ZHANG , Tie Jin LI
1994, 5(7): 627-630
[Abstract](205) [FullText HTML] [PDF 195KB](0)
Abstract:
Nanocrystalline CdS films of different sizes and thicknesses were electrochemically prepared on ITO.The films exhibit size quantization effects,manifested by large blue-shifts in their optical absorption spectra.The Surface Photovoltaic Spectroscopy (SPS) of these filnis shows particular photovoltaic behavior.It is for the first time to observe size quantization effects and a blue shift in the SPS of CdS films.
Ni-CONTAINING CARBON FILMS PREPARED BY RF GLOW DISCHARGE DEPOSITION
Wei Min CAO , Kun Lin ZHOU , Rui Hua ZHOU
1994, 5(7): 631-634
[Abstract](202) [FullText HTML] [PDF 410KB](0)
Abstract:
Ni-containing carbon films were prepared by rf glow discharge decomposition of methane and nickel carbonyl.The deposited films contained C,Ni,H,O and small amounts of N.Nickel existed in forms of metallic Ni and Ni2O3.The oxidation of nickel mainly occurred on film surface.With lower Ni contents,the film maintained the structure of DLC film-With the increase of Ni content,the films showed some crystalline features of Ni and Ni2O3.
SYNTHESIS AND INVESTIGATION OF A NEW LIQUID CRYSTAL CMPPCHPP
Yan Qing TIAN , Ying Ying ZhAO , Feng Yu SU , Xin Yi TANG , Xi Bin SHAO , Xi Min HUANG , Xiao Guang ZHAO , EN Le ZHOU
1994, 5(7): 635-636
[Abstract](213) [FullText HTML] [PDF 503KB](0)
Abstract:
A new chiral liquid crystal[4'-(2-chloro-4-methyl-pentanoyloxy)]-phenyl 2-cyano-3-(4'-a-heptanoxypkenyl)propenoate (CMPPCHPP) was synthesized.The compound was characterized by IR,1HNMR,clemental analysis.The liquid crystalline phase transition was studled by optical polarized micrography.The title liquid crystal compound end induce cholenteric pitch in nematic LC (B7902),the pitch in 12 μm at 283K.
SILICOM-OXYGEM-SILICON BOND-BREAKING BY MAGNESIUM DIETHOXIDE
Ji Mao LIN
1994, 5(7): 637-638
[Abstract](217) [FullText HTML] [PDF 64KB](0)
Abstract:
The silicon-oxygen-silicon bond in bissilyl ethers was broken by magnesium diethoxide and new silicon-oxygen-earbon bond was formed.
SYNTHESIS OF ALPO4-12 MOLECULAR SIEVE FROM NON-AQUEOUS SYSTEMS
Qiu Ming GAO , Shou Gui LI , Ru Ren Xu
1994, 5(7): 639-642
[Abstract](215) [FullText HTML] [PDF 452KB](0)
Abstract:
Hydrothermal crystallization of an aluminophosphate molecular sieve (AlPO4-12) has first been carried out from non-aqueous systems in the presence of templating agent,with the molar composition of the starting gel as 1.0Al2O3:5.0P2O5:10ethylenediamine:180ethylene glycol.Aluminum triisopropoxide and phosphorous acid(85 wt% H3PO4)were used exclusively as aourcea for aluminum and phosphorous.The product has been characterized by means of X-ray powder diffraction (XRD),scanning electron microscopy (SEM),infrared (IR)spectrum,differential thermal analysis (DTA),thermogravimetric analysis (TG),etc.
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