中国化学快报

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A FACILE SYNTHETIC ROUTE OF HYDROXY-BEARING DIBENZOAZACROWN ETHERS

Bin ZHAO, Yang Jie WU, Han Zhen YUAN

中国化学快报. 1994, 5(11): 909-912.

摘要 ( )

可视化

Five new hydroxy-bearing dibenzoazacrown ethers were synthesized by a convenient route.Reaction of salicylaklehyde with epichlorohydrin to give 1,3-bis(2-formylphenyloxy)-2-propanol,which condensed with diamines followed by a "one-pot" reduction of the corresponding bis-imine derivatives without isolation to afford the hydroxy-bearing dibenzoazacrown ethers.All of the crowns were identified by elemental analyses,IR,¹H NMR and ¹³C NMR.

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A NEW CHIRAL SCHIFF BASE FAMILY DERIVED FROM 2,4-DIHYDROXYBENZALDEHYDE

Yan Qing TIAN, Ying Ying ZHAO, Feng Yu SU, Xin Yi TANG, Xiao Guang ZHAO, En Le ZHOU

中国化学快报. 1994, 5(11): 913-916.

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The synthesis of a new series of chiral Schiff base containing 2-hydroxybenzilideneaniline moieties as mesogenic core is presented.Differential scanning calorimetry and optical polarizing microscopy were used to study the phase transition temperature and behaviors.The results reveal that all of them are mesomorphic and most of them show chiral smectic mesomorphism.

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SYNTHESIS OF DI-(2'-DEOXY-2'-FLUORO)PYRIMIDINENUCLEOSIDE PHOSPHATES AND PHOSPHOROTIOATES

Zheng Fu WANG, Yi Bing ZHANG, Yao Quan CHEN

中国化学快报. 1994, 5(11): 917-920.

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Di-(2'-deoxy-2'-fluoro)-cytidine and-uridine phosphate and phosphorothioate were synthesized by phosphoramidite approach.The diastereomer separation of the protected phosphorothioates was performed by preparative thin layer chromatography.

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STUDIES ON ISOMERIZATION OF δ-NITRILES TO PYRIDONES CATALYZED BY INORGANIC ACID SALTS

Li Juan MAO, Shi Ping GAO, Zhen Quan ZHANG. Qiang SHU, Yun Hong SUN

中国化学快报. 1994, 5(11): 921-924.

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Butanone,2-pentanone,2-hexanone and cyclohexanone were cyanoethylated,using KOH/HOCH₂CH₂OCH₃ as a catalyst,giving yields of more than 30%.Three inorganic acid salts,NaHSO₄,KHSO₄ and KH₂PO₄,were employed for the first time to catalyze the isomerization of δ-keto nitries obtained above to correspounding pyridones.The three catalysts were found to have significantly high activities and their activities have close relation to their physical properties,especially are in direct proportion to their acidities.

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THE BIRCH REDUCTION OF(1-OXO-CYCLOHEXENYLO)-2'-[2',3',b]-6,7-MEHYLENEDIOXYBENZOZEPINE

Jiang Hong WANG, Yun Zhen JIANG, Zhi Zhong ZHAO

中国化学快报. 1994, 5(11): 925-926.

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As the result of Birch Reaction of(1'-oxo-cyclo-hexenylo)-2'-[2',3',b]-6,7 methylenedioxy benzozepine,the cleavage of one of the phenolic ether bond of the methylenedioxy group was observed and the monohydroxy substituted benzozepine (D) was obtained.

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ONE-POT STEREOSELECTIVE SYNTHESIS OF FUSED RING SYSTEMS CONSISTING OF ISOXAZOLINE AND TETRAHYDRO-FURAN,-THIOPHENE,OR-PYRROLE VIA INTRAMOLECULAR CYCLOADDITION OF SILYL NITRONATES DERIVED FROM α-NITROALKENES

Chao Zhong LI, Cheng Ye YUAN

中国化学快报. 1994, 5(11): 927-930.

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Michael condensations of α-nitroalkenes with heteroatom-centered nucleophiles bearing allyl group in the presence of a base followed by the addition of trimethylchlorosilane led to the stereoselective synthesis of isoxazoline fused tetrahydrofurans,tetrahydrothiophenes or tetrahydropyrroles via intramolecular silyl nitronates-olefin cycloadditions in one-pot procedure with high yields.

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THE ENANTIOSELECTIVE AUTOINDUCTION IN THE SYNTHESIS OF OPTICALLY ACTIVE SECONDARY ALCOHOLS

Zhen Yun YANG, Xin FAN, Xiao Yun JIANG

中国化学快报. 1994, 5(11): 931-934.

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可视化

The enantioselective autoinduction effect of chiral products was observed and investigated on the addition of isobutyraldehyde with phenyllithium and n-butyllithium respectively.And the more the inductive rcagents added,the better the results.

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STUDIES ON THE PRENYLFLAVONOIDS PART X:THE TOTAL SYNTHESIS OF ANTIARONE-C AND ANTIARONE-H

Yu Lin LI, Lian Ye ZHAO

中国化学快报. 1994, 5(11): 935-938.

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Antiorone-H,3',5,7-trihytroxy-2',B-di(γ,γ-dimethylallyl)-4'-methoxyflavanone,has been synthesised by the prenylation of 2-hytroxy-4,6-dimethorymethoxyocetophenone followed by rearrangement,condensation with 4-methoxy-3-hydroxy-2-(γ,γ-dimethylallyl)benaldehyde,cyclization and demethoxymethylation.Antiarone-C has been prepared by two route at the same time.

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STRUCTURE OF POTANINE

Hat Yan PU, Feng Peng WANG

中国化学快报. 1994, 5(11): 939-940.

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A new lycoctonine-type C₁₉-diterpenoid alkaloid,potanine (1) was isolated from the roots of Delphinium potaninii W.T.Wang.Its structure was established on spectral data.

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TWO NEW TRITERPENOID SAPONINS,ASTERBATANOSIDE D ANDE,FROM ASTER SATANGENSIS

Yu SHAO, Bing Nan ZHOU, Kan MA, Hou Ming WU

中国化学快报. 1994, 5(11): 941-944.

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Two new triterpenoid saponins named asterbatanoside D and E have been isolated from Aster batangensis and their structures elucidated as 3-O-β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside and 3-O-6'-acetyl-β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside.based on MS,1D and 2D NMR techniques(COSY,TOCSY,ROESY,HMQC and HMBC),and chemical reactions.

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A NEW FLAVONOL GLYCOSIDE CAOHUOSIDE-D FROM EPIMEDIUM KOREANUM NAKAI

Wen Kui LI, Pei Gen XIAO, Ru Yi ZHANG

中国化学快报. 1994, 5(11): 945-946.

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A new flavonol glycoside named caohuoside-D was isolated from the aerial parts of Epimedium koreanum Nakai.Its chemical structure was determined by spectroscopic methods(MS,¹H NMR and ¹³C NMR)and chemical evidences.

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SELECTIVE HYDROGENATION OF 2-NAPHTHOL CATALYZED BYA SILIC A-SUPPORTED POLYALUMAZANE PLATINUM COMPLEX

Chun Wei CHEN, Ji Wen ZHENG, Mei Yu HUANG and Ying Yan JIANG

中国化学快报. 1994, 5(11): 947-950.

摘要 ( )

可视化

Silica-supported polyalumazane platinum complex displays high activity in hydrogenation of 2-naphthol under mild conditions.2-Naphthol can be converted quantitatively at 50℃ in 24 h and selectivity for the formation of 5,6,7,8-tetrahydro-2-naphthol is over 80%.

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NITRIC OXIDE DECOMPOSITION ON ALKALI-PROMOTED Pd/AL₂o₃ CATALYSTS

Guang Jin LI, Feng DONG, Yi De XU

中国化学快报. 1994, 5(11): 951-952.

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Alkali-promoted Pd/Al₂O₃ catalysts exhibit much higher activities in NO decomposition than Pd/Al₂O₃.FTIR study shows that on the alkali promoted catalyst,nitric oxide exists on the surface mainly in negatively charged form (NO^-) at high temperatures,which is consistent with the activity improvement.

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METAL ION SUBSTIUTION OF Cd₅Zn₂-METALLOTHIONEINEIN WITR CUPROUS ION MONITORED BY ¹H NMR

Wei Qiang GU, Ming FENG, Yun Hua WANG, ZhongXian HUANG

中国化学快报. 1994, 5(11): 953-954.

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可视化

Rat Liver Cd₅Zn₂-metallothionein isoforms were titrated with cuprous ion and monitored by ¹H NMR.Initial replacement occurred in β-domain followed by α-domain.MT exhibited well-defined structure under 10 mole equivalents cuprous ion.

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STRUCTURAL STUDIES ON PROTEINS IN MICROEMULSION I.FTIR STUDY ON LYSOZYME IN D₂O/SURFACTANT/n-HEPTANE SYSTEM

Yan Ll, Shi Fu WENG, Jin Guang WU, Guang Xian XU

中国化学快报. 1994, 5(11): 955-958.

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可视化

FTIR method was used in this paper to investigate the structure of lysozyme in D₂O solution and in microeraulsions.It was found from the subtraction spectra that the Amide I band shifts to lower wavenumbers in microemulsions.The assignment of deconvoiuted Amide I band was given.The curve-fitting results show that the α-helix structure of lysozyme is reduced a lot in microemulsions.

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THE SENSITIZING EFFECT OF HYDROXY-TETRAAZAINDENE ON SILVER CHLORIDE EMULSION

Jun Ping ZHENG, Sheng LIAO, De Shui ZHENG, Ping CHEN

中国化学快报. 1994, 5(11): 959-962.

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可视化

When hydroxy-tetraazaindene was introduced into sulfur-sensitized or spectrum-sensitized cubic AgCl emulsion,it could increase the speed of the emulsion,and could also inhibit the increase of fog.

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THE COMPLEMENTARITY OF ELECTROSTATIC METHODS FOR PROTEIN SYSTEMS

Yan Li WANG, Lu Hua LAl, Xiao Jie XU, You Qi TANG

中国化学快报. 1994, 5(11): 963-966.

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Solvent accessibility dependence of Tanford-Kirkwood theory (TK) has been compared with that of the finite-difference approach to Poisson Boltzmann equation (FDPB).Detailed analysis shows that both FDPB method and TK method strongly depend on amino acid residue locations.TK method is better for residues exposed to solvent,while FDPB method can treat buried residues better,which suggests that accessibility is an important factor to be considered for further modification of FDPB method,especially for charges on surface flexible side chains.The case of lysozyme strongly shows that the two methods complement each other in the sense of solvent accessibility dependence.

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ADSORPTIVE STRIPPING VOLTAMMETRIC PROPERTIES OF DBPPH AT MERCURY ELECTRODE

Nai Fei HU, Xianq Dong SUN, Net Xian LI

中国化学快报. 1994, 5(11): 967-970.

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Cyclic voltammetry shows that DBPPH has a pair of cathodic and anodic peaks at Hg electrode.E_pc=-1.49 V and E_pc=-1.43 V(vs.Ag/AgCl).The cathodic peak shows adsorptive characteristics.The adsorbed species is DBPPH neutral molecule.The method for measuring trace amount of DBPPH by adsorptive strippinq voltammetry is established.

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IN SITU FTIR AND UV/VIS STUDY OF THE ADSORPTION OF CYTOCHROME C ON GOLO ELECTRODE

Jin LUO, Zhong Hua LIN, Shao Hua HUANG, Jin Tian WU

中国化学快报. 1994, 5(11): 971-974.

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The adsorption behaviour has been studied using in situ FTIR and UV/Vis spectroscopy,voltammetry,AC impedance and potential step methods.The results show that cytochrome c can be irreversibly adsorbed on the gold surface in a complete monolayer and the adsorbed layer can mediate the redox reaction of cvtochrome c in the solution,but not all adsorbed cvtochrome c molecules would play this role.

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4,6-DIMETHYL-2-MERCAPTOPYRIMIDINE AS NEW PROMOTER FOR THE VOLTAMMETRIC RESPONSE OF HORSE HEART CYTOCHROME CAT A MICROBAND GOLD ELECTRODE

Hong Yuan CHEN, Chen Xin CAI and Huang Xian JU

中国化学快报. 1994, 5(11): 975-978.

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可视化

A new promoter,4,6-dimethyl-2-mercaptopyrimidine (DMMP),was used to modify a microband gold electrode for promoting the direct elctrochemistry of cytochrome c was reported.The experimental results indicated that DMMP is a more effective promoter for redox reaction of cytochrome c than others.

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EFFECT OF COBALT ION IMPLANTATION ON THE ELECTROCHEMISTRY OF NICKEL ELECTRODE

Sheng Tao ZHANG, Zong Qing HUANG

中国化学快报. 1994, 5(11): 979-982.

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The effect of cobalt implanted on the electrochemistry of nickel electrode in 1 mol/L NaOH was studied with spectroscopic cllipsometry in-situ and electrochemical technique.Ion implantation with cobalt into nickel improved the charging efficiency of nickel hydroxide/oxy-hydroxide electrode and made the transferring rate of nickel hydroxide to discharging activity material (NiOOH) obtain 10% increase.Ion implantation with cobalt almost had not effect on the complex refractive index of nickel substrate.

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PHOTOCONDUCTIVITY OF POLYIMIDE LANGMUIR-BLODGETT FILMS WITH Cupc GROUP

Zhi Kang XU, You Yi XU, Zhi Ping LOU

中国化学快报. 1994, 5(11): 983-984.

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Electrophotographic photoreceptor with copper-phthalo-cyanine(CuPc) polyimide Langmuir-Blodgett fime as charge-generating layer was fabricated.The photoconductivity of the polyimide LB film was investigated using photoinduced discharge technique.

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STRUCTURES AND PROPERTIES IN IN-SITU COMPOSITES ITES OF LC70/PET

Hong Fang ZHANG, Jinn Ping ZHANG, Min Yu, Zhi shen MO, Chao Shan ZHU, Li Yun Lu

中国化学快报. 1994, 5(11): 985-986.

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可视化

Structures and properties of the blends of thermotropic liquid crystalline polymer(LC70)and poly(ethylene terephthalate)(PET)were investigated by using WAXD,DSC,SEM and mechanical test.The results revealed that Wc,x markdly decreased with LC70/PET>30%,and at about LC70/PET=10%,this blend can yield better mechanical properties.In these blends LC70 can play the role of the nuclear agent for PET.SEM photo showed that LC70/PET in in-situ composites possessed "core-shell" structure and was immiscible,but at LC70/PET=10%,the LC70 can be uniformly dispersed into matrix PET.

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SYNTHESIS OF CHIRAL TETRAHEDRAL TRANSITION METAL CARBONYL CLUSTERS SFeCoM(CO)₈(RCOCp)(M=Mo,W;R=H,CH₃,C₂H₅O) AND THE CRYSTAL STRUCTURE OF SFeCoW(CO)₈(C₂H₅O₂CCp)

He Ping Wu, Yuan Qi YIN, Xiao Ying HUANG

中国化学快报. 1994, 5(11): 987-990.

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Six chiral tetrahedral metal carbonyl clusters SFeCoM(CO)₈(RCOCp)(M=Mo,W;R=H,CH₃,C₂H₅O)were synthesized by a solution of SFeCo₂(CO)₉ refluxing with the metal carbonyl reagent NaM(CO)₃(RCOCp)in THF.These clusters were characterized by C/H element analysis,IR and ¹H NMR and the X-ray crystal structure of the cluster SFeCoW(CO)₈(C₂H₅O₂CCp)

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XPS STUDY ON Mo-Cu-S CLUSTERS

Jian Ping LANG, Yong Su JIN, Qing Bing HUANG, Xin Quan XIN

中国化学快报. 1994, 5(11): 991-992.

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可视化

The binding energies of Mo,Cu,S and Br atoms in (NH₄)₂MoS₄,[(n-Bu)₄N]₄[MoS₄Cu₆Br₈] and [MoS₄Cu₆Br₄(Py)₄]_n were determined by using XPS.The results revealed some differences in bonding properties of these three clusters.

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ELECTRON-TRANSFER IN POLYNUCLEAR CYANO-BRIDGED COMPLEX OF THE TYPE[Co(Ⅲ)L₃-μ-Nc-Fe(Ⅱ)(CN)₅]-(L=en)

Shu Zhong ZHAN, Xiao Yuan CHEN, Ging Jin MENG

中国化学快报. 1994, 5(11): 993-994.

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A deep red crystalline binuclear cobalt-iron cyano-bridged complex [L₃Co(Ⅲ)-NC-Fc(Ⅱ)(CN)₅]^-(L=ethylcncdiamine) was firstly prepared.Electron transfer between remote redox centers of iron(Ⅱ) and cobalt(Ⅲ) was investigated by means of IR,cyclic voltammogram and electronic spectra.

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AB INITIO CONFIGURATION INTERACTION STUDY OF THE ELECTRONIC AND GEOMETRIC STRUCTURE OF MIXED NEUTRAL AND CATIONIC Bli_k(k=1-7)CLUSTERS

Hua Bei ZHANG, An Min TIAN, Guo Sen YAN

中国化学快报. 1994, 5(11): 995-998.

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可视化

The geometries of mixed neutral and cationic BLi_k(k=1-7)clusters have been determined with energy gradient method.The correlation energy is considered with the single-double configuration interaction(CISD).The boron atom B takes the central position in the most stable geometries of all clusters studied except in the neutral BLi₃ cluster.The binding energies per atom and the second differences in energies are discussed.

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SHIP-IN-BOTTLE SYNTHESIS AND CHARACTERIZATION OF Ru₄H₄(CO)₁₂ ENTRAPPED WITHIN NaY ZEOLITE

An Ming LIU, Yi De Xu, Takafumi SHIDO, Masaru ICHIKAWA

中国化学快报. 1994, 5(11): 999-1000.

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可视化

The ruthenium hydrido-carbonyl cluster in NaY zeolite,synthesized by the reaction of Ru₃(CO)₁₂/NaY with hydrogen,was characterized by FTIR,UV-VIS and EXAFS spectroscopies.

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CHANGE OF CeVALENCE STATE DURING THE PREPARATION OF CeO₂ ULTRAFINE POWDER BY SOL-GEL METHOD

Xiang Ting DONG, Yi CUI, Guaug Yan HONG, De Cai YU

中国化学快报. 1994, 5(11): 1001-1002.

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CeO₂ ultrafine powder was prepared by sol-gel method.XRD showed that samples were amorphous when caleination temperature was below 230℃,and single phase CeO₂ ultrafine powders could be obtained above 250℃.It was found that Ce³⁺ and Ce⁴⁺ coexisted in the dried gel.the content of Ce³⁺ lowered gradually and that of Ce⁴⁺ increased in samples when calcining tempersture increased,Ce³⁺ was converted to Ce⁴⁺ completely at 250℃.

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1994年, 第5卷, 第11期　刊出日期：1994-11-20

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1994年, 第5卷, 第11期 刊出日期：1994-11-20

1994年, 第5卷, 第11期　刊出日期：1994-11-20