中国化学快报

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A NEW SYNTHESIS OF 1,4-DISUBSTITUTED AZO UREAS

Jian Ping LI, Jin Ye WANG, Dong Un MA, Yu Lu WANG

中国化学快报. 1996, 7(05): 393-394.

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Ten new 1,4-disubstituted azo ureas were synthesized by the reaction of substituted semicarbazide compounds with a phenoxyl radical between two phases in good yield.

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SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF TRIPYRRANE-CONAINING BISMACROCYCLE

Shi Ming DONG, Duo Yuan WANG

中国化学快报. 1996, 7(05): 397-398.

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A novel tripyrrane-containing bismacrocycle ligand was acquired by the improved procedure of the metal template 1:1 Schiff base condensation.The condensation of diformyltripyrrane <1> with 3,4,3',4'-tetraamino-biphenyl hydrochloride was modified by excluding water efficiently,then the yield was increased to over 90%.

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SYNTHESIS AND SPECTROSCOPIC PROPERTIES OF AN AMINO ACID MODIFIED PHTHALOCYANINE

Run An DONG, Yong QIU, Xin Qi SONG, De Wen CHEN

中国化学快报. 1996, 7(05): 399-400.

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One amino acid modified phthalocyanine was synthesized and its absorption was measured.And a red shift up to 25 nm relative to ZnPc (NH₂)₄ was found.

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SYNTHESIS AND VESICLES OF A DOUBLE-CHAIN GLYCOLIPID

Zi Chen LI, Wei HE, Fu Mian LI

中国化学快报. 1996, 7(05): 401-402.

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A double-chain glycolipid,dioctadecyl-2-glucopyronosylthio-succinate (1) was synthesized.The glycolipid itself formed stable vesicles.It could also be incorporated into the lipid bilayer membrane to form stable mixed liposomes.

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AN ALTERNATE SYNTHESIS OF 4,6-DIHYDROXYQUINAZOLINE

Yi Qiang ZHU, Hui Tong TANG, Pang ZHANG

中国化学快报. 1996, 7(05): 403-406.

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The title compound was synthesized by condensation of methyl 2-dimethoxyacetyl-4-oxopentanoate and thiourea followed by desulfurization and acid-catalyzed cyclization.

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SYNTHESIS OF 1-SUBSTITUTED 1H-1,2,4-TRIAZOLE DERIVATIVES

Yan Nian SIH, Yang YANG, Jian Xin FANG, Wen Shuo LU

中国化学快报. 1996, 7(05): 407-410.

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Three new series of triazole compounds were synthesized.The method of synthesis and biological activities of these new compounds were studied.

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SELECTIVE REDUCTION OF CLERODANE DITERPENOIDS

Huan Ming CHEN, Zhi Da MIN

中国化学快报. 1996, 7(05): 411-414.

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The α,β-unsaturated γ-lactones of neo-clerodane diterpenoids teucvidin,teupernin E and ajugacumbin A were selectively transformed into saturated γ-lactones and unsaturated diol derivatives with NaBH₄.These transformations are of interest due to their selective reduction as compared with catalytic hydrogenation and LiAlH₄ reduction of these diterpenoid compounds.

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ASYMMETRIC SYNTHESIS XXⅧ:ENANTIOSELECTIVE REDUCTION OF AROMATIC KETONES CATALYZED BY NEW CHIRAL CATALYST-(4R,8R,9S)-CAMPHANE[8,9-b]-1,3,2-OXATHIOBOROLIDINE

Yao Zhong Jiang, Xiao Ming Feng, Liu Zhu Gong, Zhi Li, Gui Su Yang, Ai Qiao Mi

中国化学快报. 1996, 7(05): 415-418.

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(4R,8R,9S)-Camphane[8,9-b]-1,3,2-oxathioborolidine prepared from (1R,2S,3R)-3-mercapto-camphol with borane was used as catalyst in the enantioselective reduction of aromatic ketones:moderate enantioselectivities with e.e.7.44%-51.04% have been obtained for aromatic ketones with 20% mol catalyst,73.78% e.e for ω-bromo acetophenone with 100% mol catalyst.

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DIRECT CONVERSION OF 3-ACETOXYBENZOFURANS TO 3-METHOXYBENZOFURANS

Zhi Min WANG, Xiao Tian Liang, Shu Feng CHEN

中国化学快报. 1996, 7(05): 419-422.

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A direct conversion of 3-acetoxybenzofurans to 3-methoxybenzofurans was realized by refluxing in anhydrous methanolic solution containing hydrogen chloride.

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A NEW REACTION FOR ONE-POT, SELECTIVE MONO-O-GLYCOSYLATIONS OF 9,10-DIHYDROXYPHENANTHRENE UNDER MILD CONDITIONS

Zhong Wu GUO, Yong Zheng HUI

中国化学快报. 1996, 7(05): 423-424.

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9,10-Dihydroxyphenanthrene was selectively mono-O-glycosylated by a new,one-pot reaction through its activated phospholane intermediate.The reactions were carried out under mild conditions without activation of the anomeric center.

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BIS-PER(POLY)FLUOROALKYLATION OF PARA-SUBSTITUTED PHENOLS BY R_FI/Na₂S₂O₄ REAGENT SYSTEM

Wei Yuan Huang, Hong Bin Yu

中国化学快报. 1996, 7(05): 425-426.

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In the presence of dithionate,excess per (poly) fluoroalkyl iodide reacted with parasubstituted phenolates to provide bis-per (poly) fluoroalkyl substituted phenols in fair to good yields.

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SYNTHESIS OF TETRAMETHYL SALVIANOLIC ACID F AND TRIMETHYL PRZEWALSKINIC ACID A

Chun Bo AI, Lian Niang Li

中国化学快报. 1996, 7(05): 427-430.

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Salvianolicacid F (la) and przewalskinic acid A (2a) are phenolic acids isolated from the traditional and herbal Chinese medicines Salvia miltiorrhiza (1) and S. przewalskii (2). The chemical structures of these nvo compounds represent the main carbon skeletons of the biologically active depsides salvianolicacid A and B isolated from S.miltiorrhiza (3.4). 丁he present paper reports the synthesis of the methyl ether protected phenolic acids, tetnimetfayl salvianolic acid F (lb) and trimethyl przewaiskinic acid A (2b).

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A NEW METHOD FOR THE PREPARATION OF FULLEROL

Da Yong SUN, Zi Yang LIU, Xing Hua GUO, Yi Min SHE, Yu ZHOU, Shu Ying LIU

中国化学快报. 1996, 7(05): 431-432.

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Reaction of C₆₀with excessive potassium in toluene at refluxing temperature results in black precipitate K₂C₆₀with high conversion,which can completely be hydrolyzed to prepare the fullerol.Investigations including FT-IR.¹H NMR.¹³C NMR.UV-Vis and FABMS of the product were reponed.

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REACTIONS OF C₆₀ WITH R₃SnH:A NEW SYNTHETIC TO C₆₀(RH)_n AND THE PROPERTY OF C₆₀ TO CATALYZE RADICAL REACTIONS

Yi Min SHE, Ya Ping TU, Xing Hua GUO, Zi Yang LIU, Shu Ying LIU

中国化学快报. 1996, 7(05): 433-436.

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A new method for the preparation of polyalkyl and polyarenefullerene derivatives C₆₀(RH)_n (R=Bu,n=1-3;R=Ph,n=1-10) by the reaction of C₆₀ with organotin hydride in toluene is described.Another series of products of stannanes R_aSn_bH_c (R=Bu,a=3-8,b=1-4,c=0-3;R=Ph,a=3-11,b=1-5,c=0-4) were also obtained,which shows that C₆₀ can catalyze polymerization of organic-tin.These products were determined by mass and infrared spectrometry.And the possible reaction mechanisms are discussed.

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CHEMICAL MODIFICATION INCREASE THE ACTIVITY AND ENANTIOSELECTIVITY OF CANDIDA LIPOLYTICA LIPASE

Gang DUAN, Jia Yong CHEN

中国化学快报. 1996, 7(05): 437-438.

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In this work,the effects of chemical modification on the activity and enantioselectivity of Candida lypolytica lipase in resolution of Ibuprofen were reported.

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A NEW INGENOL ESTER FROM EUPHORBIA PETIOLATA

Yan-Ping SHI, Bin Zhong-Jian JIA, Jamil LAHHAM, Sadiq A. SALEH

中国化学快报. 1996, 7(05): 439-440.

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A new monoester of the tetracyclic diterpene ingenol was isolated from Euphorbia petiolata and its structure was elucidated by spectroscopic methods and chemical transformation as ingenol-3-O-(2'E,4'Z)-tetradecadienoate.

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A NEW DITERPENOID FROM COLEUS SCUTELLARIOIDES

Qing MU, Hong Jie ZHANG, Chao Ming LI, Han Dong SUN

中国化学快报. 1996, 7(05): 441-442.

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From the herbs of Coleus scutellarioides,a new diterpenoid was isolated and identified as 2-(2'ξ-methoxypropyl)-3-hydroxy-5,7,8-trimethylphenanthrene-1,4-dione,named as scutequinone (1).

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STRUCTURE OF 6-EPICHASMANINE

Zheng Bang LI, Feng Peng WANG

中国化学快报. 1996, 7(05): 443-444.

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A new norditerpenoid alkaloid,6-epichasmanine,was isolated from the roots of Aconitum kusnezoffii.Its structure was determind on the basis of spectrscopic analysis.

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TWO NEW PHENYLPROPANOID GLYCOSIDES FROM CARYOPTERIS INCANA(THUNB.) MIQ

Jian Jun GAO, Gui Qiu HAN, Li YANG

中国化学快报. 1996, 7(05): 445-448.

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Two new phenylpropanoid glycosides,incanoside A and B were isolated from the whole plant of Caryopteris incana (Thunb) Miq.On the basis of chemical and spectral evidence,incanosides A and B were determined as 3-hydroxy-4-methoxy-β-phenylethyl α-L-rhamnopyranosyl (1→3)-β-D-glucopyranosyl (1→2)-6-O-reruloyl-β-D-glucopyranoside and 3-hydroxy-4-methoxy-β-phenylethyl α-L-rhamnopyranosyl (1→3)-β-D-glucopyranosyl (1→2)-β-D-glucopyranoside,respectively.

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SALVIAFLASIDE AND SALVIAFLASIDE METHYL ESTER TWO NEW DEPSIDIC GLYCOSIDES FROM SALVIA FLAVA

Li Min ZHAO, Wen Yi HE, Xiao Tian LIANG, Lian Niang LI

中国化学快报. 1996, 7(05): 449-452.

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可视化

Two new depsidic glycosides salviaflaside and its methyl ester were isolated from the aqueous extract of Salvia flava.Their structures were elucidated by spectral analysis,especially by 2D NMR analysis.

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SPECTROFLUORIMETRIC DETERMINATION OF TERBIUM USING THE SYSTEM OF Tb(Ⅲ)-TPA

Jun ZHAO, Guo Hu ZHAO, Qi LUO

中国化学快报. 1996, 7(05): 453-456.

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可视化

Terbium can form a stable binary chelate with terephthalic acid (benzene-1.4-dicarboxylic acid(TPA)) having a ratio of 1:2 in aqueous solution in the pH range of 5~6.The maximum excitation and emission wavelengths are 260 nm and 545 nm for terbium chelate,respectively.The fluorescence intensity of terbium chelate remains stable in 8 h with a relative standard deviation in the range of =4%.The rest or the lanthanide ions and the common foreign ions hardly interfere the determination.

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THE CONSTANT PHASE ELEMENT (CPE) ON MnO₂ ELECTRODE

Yuan GUO, Xi XIA

中国化学快报. 1996, 7(05): 457-458.

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Ac impedance responses of electrolytic manganese dioxide (EMD) electrode are measured with EIS.It was found that the impedance responses are consistent with the constant phase element (CPE) form and calculated the fractal dimension of MnO₂.

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THE REACTION OF CALCIUM WITH WAZO-1 AND ITS BIOANALYTICAL APPLICATION

Zhen Hua CHEN, Zhong Yi YU, Quan YIN, Li XU, Ti Ping HE, Rong Sen SHEN

中国化学快报. 1996, 7(05): 459-462.

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A selective new reagent Wazo-1 was prepared.This paper studied the properties of its fluorescence and UV-Spectrum.A new fluorescence method for the determination of calcium is developed.Wazo-1 reac■s with calcium.forms calcium complex (Ex=297nm;Em=370nm).The interference of Mg(Ⅱ) has been studied.The reagent has better selectivity to Ca(Ⅱ) in the presence of large amount of Mg(Ⅱ).Flucrescence method has-been used for the determination of microamounts of calcium in serum with new reagent Wazo-1.The results obtained are favourable.

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GRAFT COPOLYMERIZATION OF BUTYL ACRYLATE ONTO CASEIN INITIA BY POTASSIUM DIPERIODATOARGENTATE

Wei Hong LIU, Ying Hai LIU, Ya Juan SHANG, Ming Jun HAN, Lei SHI

中国化学快报. 1996, 7(05): 463-466.

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A new initiator,potassium diperiodatoargentate (Ⅲ),was used to initiate graft copolymerization of butyl acrylate(BuA) onto casein which showed a very high grafting efficiency.Grafting efficiency and percent conversion of monomer were evaluated in all cases.Infrared spectra and thermal analysis for casein and the grafting copolymer were taken to establish evidence for grafting.A possible initiation mechanism was proposed.

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NATURAL BOND ORBITAL ANALYSIS OF RED ROUSSINATE AND BLACK ROUSSINATE

Zhi Da CHEN, Xiang Hui YI, Xian Ling KONG, Le Min LI, Jia Xi LU

中国化学快报. 1996, 7(05): 467-470.

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In the purpose of study on the electronic structure feature for the activation center of the FeMo-cofactor of the nitrogenase as well as activation process of a dinitrogen molecule.the black Roussinate with an Fe₄S₃ cluster core is regarded as the first modeling complex.In this paper,natural bond orbitals for the cluster anions of the black Roussinate and the related red Roussinate are calculated on the basis of the first-order density matrixes obtained by the use of DV-Xα SCC method,leading to reasonable bonding patterns.

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MCSCF AND VTST STUDIES OF THE REACTION CH(²π)+H₂→CH₃

Si Yu, Ruo Zhuang LIU

中国化学快报. 1996, 7(05): 471-474.

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The reaction path of the reaction CH(²π)-H₂→CH₃ is traced with IRC theory and MCSCF,6-31G method.On this basis,the dynamical properties and VTST rate constants are investigated.The results show that the curvature of the reaction path is considerable and its effects to rate constants are sensitive.

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THE ⁴Σ- STATES OF THE FO RADICAL

Ming Bao HUANG

中国化学快报. 1996, 7(05): 475-478.

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For investigating the ⁴Σ^-→ ⁴Σ^- transition in the FO radical to which an observed 268 nm ASE line has been attributed,the potential energy curves of the four lowest-lying ⁴A₂ states of FO have been calculated using the MRSDCI method.The results indicate that the first ⁴Σ^- (l⁴A₂) and the upper ⁴Σ^-(4⁴A₂) states are weakly bound and bound states respectively,and the 2⁴A₂ and 3⁴A₂ states are both repulsive states which are not relevant to the emission.The predicted Te value for the ⁴Σ^-→ ⁴Σ^- transition is 4.62 eV,which is in excellent agreement with the photon energy value (4.63 eV) of the ASE line.The procedure of our MRSDCI calculations for excited states is described in detail,and the previous calculation results for these states are discussed.

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THE CALCULATION OF THE FORCE CONSTANT BETWEEN DIVALENT METAL IONS AND THEIR LIGANDS

Zheng Yu ZHOU, Ji Yin ZHANGT, Xun Cheng SU

中国化学快报. 1996, 7(05): 479-482.

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On the basis of the capture potential of force field and the adiabatic invariance proposed by Bates,the quadratic force constants between divalent metal ions in ⅡB group and ligands were calculated.Compared with the experimental results,the calculated contants are satisfactory and the reasons for the difference are given.

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INVESTIGATION ON THE PHASE DIAGRAM OF TERNARY SYSTEM LaCl₃-SrCl₂-LiCl

Chao Gui ZHENG, Yan Ke ZHENG

中国化学快报. 1996, 7(05): 483-486.

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The phase diagram of ternary system LaCl₃-SrCl₂-LiCl has been investigated by means of DTA.It was found that there were three fields corresponding to primary crystallization of LaCl₃,SrCl₂ and LiCl respectively,three univeriant curves related to the secondary crystallization,a ternary eutectic E(46.8% LaCl₃,25.4% SrCl₂,30.0%LiCl;469℃) in the system.A ternary reaction occurred in the system:L=LaCl₃+SrCl₂+LiCl

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AN ESR STUDY OF MgO TREATED WITH SHOCK WAVE

Ting Lu YANG, Kang XU, Liang Bo FENG, Shi Kong SHEN

中国化学快报. 1996, 7(05): 487-490.

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A MgO sample treated with shock wave was studied by using electron spin resonance(ESR) spectroscopy.An isotropic ESR singal at g=2.002 could be designated to F centers.O₂superoxide ions penetrated into the surface layer of MgO powder after shocking were identified at g_xx=2.006,g_yy=2.009,and g_zz=2.023,2.025.The change of surface adsorption ability for O₂ of shocked MgO was discussed.

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LEWIS ACIDIC SITES NOT ASSOCIATED WITH EXTRA-FRAMEWORK ALUMINUM IN DEHYDROXYLATED ZEOLITE HZSM-5

Tie Hong CHEN, Ping Chuan SUN, Ai Ju MEN, Zhong Yong YUAN, Zhen Ya GUO, Jing Zhong WANG, Da Tong DING, He Xuan LI

中国化学快报. 1996, 7(05): 491-492.

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Zeolite HZSM-5 calcined at different temperatures were studied by²⁹Si MAS NMR and EPR methods.It was concluded that in certain temperature range,dealumination did not necessarily occur simultaneously with framework dehydroxylation and thus framework Lewis acidic sites emerged.Two processes may be operative with one of them being predominant at different temperatures.

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PROPERTIES OF ULTRAFINE SnOx THIN FILM MADE BY PLASMA POLYMERIZATION

Yong ZHANG, Kun Lin ZHOU, Wei Min CAO, Wei Min LIU

中国化学快报. 1996, 7(05): 493-494.

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Ultrafine SnOx thin films were prepared from tetrabutyltin by RF glow dis charge polymerization. Annealing behaviour of films under air and gas-sensitive property were investigated.The ultrafine SnOx thin film with average particle size of 6nm exhibited a high sensitivity of 30 to 500ppm EtOH at 200℃.

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A STUDY ON PHOTOELECTROCHEMICAL CHARACTERIZATION OF TiO₂ NANOCRYSTALLINE THIN FILMS

Xue Ping LI, Wei Bo WANG, Xu Rui XIAO

中国化学快报. 1996, 7(05): 495-496.

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Nanocrystalline TiO₂ thin films have been prepared on a conducting glass surface by coating quantized TiO₂ colloids.The photoelectrochemical properties of TiO₂ thin films and their dependence on various factors have been studied.To obtain maximum photocurrent optimization of film thickness,sintering temperature and the pH of the electrolyte are very important.

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ISS AND AES STUDIES OF CHANGES INDUCED ON Ni₃Ti(0001) BY OXYGEN EXPOSURE

Li Jun YAO, Guo Xing XIONG, De Zheng WANG, Shi Shan SHENG, Heng Rong CHEN, Xie Xian GUO

中国化学快报. 1996, 7(05): 497-498.

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The surface compositional changes of Ni₃Ti(0001) induced by oxygen exposure have been examined at different dosing temperatures.Oxygen induced segregation of titanium occurs rapidly above 500℃,but only rearrangement betweeen nickel and titanium in the outer two or more layers occurs upon oxygen exposure at room temperature.Oxygen atoms penetrate into the sublayers of Ni₃Ti(0001) at 500℃ and reside mainly on the surface at room temperature.

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DOUBLE SUBSTITUTE CALIBRATION FOR THE ISOTOPIC RATIO MEASUREMENT AMONG RARE EARTH ELEMENTS

Tsing Lien CHANG, Dun Min ZHAO

中国化学快报. 1996, 7(05): 499-502.

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可视化

Through the application of the method of double substitute calibration using the true isotopic ratios of cerium and europium of our laboratory standards,the atomic weight of ytterbium has been determined as A_■(Yb)=173. 0428(15) on 2σ basis.

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1996年, 第7卷, 第05期　刊出日期：1996-05-20

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1996年, 第7卷, 第05期 刊出日期：1996-05-20

1996年, 第7卷, 第05期　刊出日期：1996-05-20