中国化学快报

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THE DIFFERENTIATION BETWEEN N-PHOSPHORYL HOMO-SERINE AND SERINE

Qing Jin YAN, Ying Wu YIN, Qian WANG, Yu Fen ZHAO

中国化学快报. 1995, 6(04): 267-270.

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可视化

Chemically,N-phosphoryl homo-serine was much more stable than the homologous compoundphosphorylated serine.The latter was very reactive to undergo N→O migration,formation of peptide and cyclophosphoroamidate but not the former when they were warmed in alcohol or chloroform at 40℃.For the N-phospho-homo-serine,only a small extent of ester exchange occurred on the phosphorus.A second type of penta-coordinate phosphorus intermediate was proposed.

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A NEW SYNTHETIC METHOD OF ORGANOSILICON IMIDAZOLINE

Shu Mei DENG, Xu LI

中国化学快报. 1995, 6(04): 271-272.

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β-(2-Imidazolinyl)-ethyl methyl diethoxy silane was obtained from β-cyanoethyl methyl diethoxy silane with ethylenediamine by using sulphur as the catalyst.

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A TOTAL SYNTHESIS OF [5',5'-BIS (VALINE)] ACTINOMYCIN D

Rui WANG

中国化学快报. 1995, 6(04): 273-274.

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A new analogue of AMD,[5',5'-bis (valine)]actinomycin D was synthesized

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STUDIES ON CARBOHYDRATES XIV. HIGHLY STEREOSELECTIVE SYNTHESIS OF 1-O-α-ACYL-D-MANNOPYRANOSE FROM THE CORRESPONDING MANNOSYL TRIMETHYLSILYL ETHER

He Qing HUANG, Zhong Jun LI, Meng Shen CAI

中国化学快报. 1995, 6(04): 275-278.

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In the presence of BF₃.OEt₂,l-O-trimethylsilyl-2,3,4,6-tetra-O-benzyl-α-D-mannopyranose (1)reacted stereoselectively with a series of carboxylic acids to give the corresponding α-mannosyl carboxylates in good yields.The configuration of products was assigned mainly by ¹H-NMR spectra (δ_H1 and³J_1,2).

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SYNTHESIS OF CF₃-SUBSTITUTED ENEDIYNES

Feng HONG, Chang Ming HU

中国化学快报. 1995, 6(04): 279-280.

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Synthesis of CF₃-substituted enediynes through palladium-catalyzed reaction of (Z)-1,2-dibromo-3,3,3-trifluoropropene with 1-alkynes in good to excellent yields is described.

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SYNTHESIS OF 3-PER (POLY)FLUOROALKYLPYRAZOLES

Xiao Qing TANG, Chang Ming HU

中国化学快报. 1995, 6(04): 281-284.

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The reaction of the adducts of per (poly)fluoroalkyl iodides and vinyl acetate with hydrazine monohydrate to give the corresponding 3-per (poly)fluoroalkylpyrazoles in excellent yields is described.The reaction might go through a hydrazone intermediate.

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THE SYNTHESIS AND 2D NMR STUDY OF DELTORPHINS

Rui WANG, Xiao Yu HU, Hong JI, Xiao Jie XU, Ruo Heng ZHANG, Lu Hua LAI

中国化学快报. 1995, 6(04): 285-288.

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We synthesized Deltorphin Ⅰ,Deltorphin Ⅱ,and their L-Alanine analogs at position 2.The synthesis was carried out with SPPS and Boc strategy.The data we got from FAB MS,AAA and sequence analysis were in agreement with the caculated values.We studied the 2D NMR for Deltorphin Ⅱ and[L-Ala²]Deltorphin Ⅱ in DMSO solution.The ¹H-¹H COSY and 2D NOESY spectra were resolved by computer treatment.The conformations of C-fragment tetrapeptides of Deltorphin Ⅱ and its L-Ala analog might form a 3₁₀ α-helix.The molecular models of these two peptides were established.

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SYNTHESIS OF A 2-ARYLBENZOFURANOID DERIVATIVE

Zhao Hui YAN, Lian Niang LI

中国化学快报. 1995, 6(04): 289-292.

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A derivative of 2-arylbenzofuranoid pattern fashioned after the naturally occurring isolates from Salviamiltiorrhiza was synthesized by Perkin condensation and oxidative ring closure.

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DESIGN AND SYNTHESIS OF CYCLODEXTRIN DIMERS WITH TWO IMIDAZOLIUM RESIDUES AS CATALYTIC SITE

Sheng Jin GUO, Mei Ming LUO, Xiao Rong GU, Ru Gang XIE, Hua Ming ZHAO

中国化学快报. 1995, 6(04): 293-296.

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Abstract Reaction of 6-deoxy-6-(N-imidazolyl)-β-cyclodextrin 2 with α,α'-dibromoxylene afforded cyclodextrin dimer 3 with two imidazolium residues as catalytic site and two cyclodextrin cavities as binding site.

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SYNTHESIS AND X-RAY STRUCTURE OF A NEW PYRRYL SUBSTITUTED PHOTOCHROMIC FULGIDE

Lian He YU, Yang Fu MING, Mei Gong FAN, Ying ZHU

中国化学快报. 1995, 6(04): 297-300.

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A new heterocyclic fulgide:E-(α)-(1,2-dimethyl-4-isopropyl-5-phenyl)-3-pyrryl ethylidene (isopropylidene) succinic anhydride (1) has been synthesized.The molecular conformation and atomic labelling structure of (1) was obtained by X-ray analyses.Compound (1) shows a twisted structure between different ring systems.The short distance between C1 atom and C22 atom (3.567 Å) offers a favourable structure for the photoinduced intramolecular cyclization of 1.

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PREPARATION OF DI-GRIGNARD REAGENTS MEDIATED BY THE TRANSITION METAL CHLORIDES

Li ZHANG, Shi Jian LIAO, Yun XU, Dao Rong YU, Yi Ping ZHANG

中国化学快报. 1995, 6(04): 301-304.

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In the presence of transition metal chloride and potassium iodide,di-Grignard reagents can be produced efficiently by the reactions of aryl dichlorides with active magnesium species,which are formed in situ from commercial magnesium powder activated by a small amount of anthracene.

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TWO NEW POLYOXYGENATED CYCLOHEXENES FROM UVARIA GRANDIFLORA

Xi Ping PAN, De Quan YU

中国化学快报. 1995, 6(04): 305-308.

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ABSTRACT:Two new polyoxygenated cyclohexenes,uvarigranol A and uvarigranol B,together with the known zeylenol were isolated from the roots of Uvaria grandiflora Roxb (Annonaceae).Their structures were established on the bases of ¹HNMR,MS,IR,CD spectra and chemical correlation.

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SWINANINE C & D,TWO NEW DITERPENE ALKALOIDS FROM DELPHINIUM SWINANENSE VAR LEPTOPOGON

Suo Hing ZHANG, Ji HA, Qing Yu OU

中国化学快报. 1995, 6(04): 309-310.

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Two new diterpene alkaloids named swinanine C and D were isolated from Delphinium swinanense var leptopogon (H.-M.) W.T.Wang.Their structures were elucidated by means of spectral methods,principally ¹H-NMR,DEPT and ¹³C-NMR techniques.

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THEORETICAL STUDIES ON THE CYCLOADDITION REACTION OF FLUOROKETENE WITH ETHYLIDENIMINE

Zhen Feng XU, De Cai FANG, Xiao Yuan FU

中国化学快报. 1995, 6(04): 311-314.

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The stereospecific rule of the cycloaddition reaction of ketene and imine has been treated theoretically in this paper.By comparing the barrier heights,it can be seen that for trans imine the reaction will give cis product,and for cis imine the reaction will give trans product.

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¹HNMR STUDY OF INTRAMOLECULAR STACKING IN TERNARY PALLADIUM (Ⅰ) COMPLEXES INVOLVING ADENOSLNE 5'-TRIPHOSPHATE AND LIGANDS CONTAINING OXYGEN AND/OR NITROGEN AS DONOR ATOMS

Hong Liang SUN, Yu Qiu GONG

中国化学快报. 1995, 6(04): 315-316.

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The intramolecular aromatic-ring stacking interaction of mixed-ligand complexes Pd (A) (ATP)^2- in the system Pd²⁺-A-ATP^4- has been determined by ¹HNMR,where A=1,10-phenanthroline (Phen),2,2'-bipyridyl (Bpy) and L-tryptophan (Trp^-);ATP^4-=adenosine 5'-triphosphate.The result indicates that it is the partial stacking between the indole ring of ATP^4- and the heterocyclic ring of A that makes H(2),H(8) and H(1') in the ATP^4- shift upfield significantly.Accordingly,the order of aromatic-ring interaction in the mixed-ligand complexes has been obtained as follows:Pd (Phen) (ATP)^2- > Pd(Bpy) (ATP)^2- > Pd(Trp) (ATP)^3-.

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ESTIMATION OF ATOMIC CHARGE IN NEUTRAL MOLECULES

Qian Ji LI, Zuo Xin WANG

中国化学快报. 1995, 6(04): 317-320.

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An empirical method is proposed to estimate atomic charge for electrical neutral molecules containing multi-centers or groups.The harmonic mean is adopted and extended to estimate the electron density distribution of this kind of molecules.The results show that the data calculated not only are consistant with the principle of electronegativity equalization,but also more reasonable.Why organic acids are stronger than organic alcohols in acidity has been discussed on the basis of calculated partial charges.

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POLAROGRAPHIC CATALYTIC WAVE OF GLYCYRRHIZIC ACID

Jun Feng SONG, Wei GUO, Hui DU

中国化学快报. 1995, 6(04): 321-324.

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A polarographic catalytic wave of glycyrrhizic acid (Ⅰ) in the presence of H₂O₂ is described.The electrochemical process is considered to be that I yielded a free radical intermediate through a one-electron reduction of its C=C double bond,and the active intermediate was oxidized to regenerate I.The catalytic wave should be new-type one due to reduction and regeneration of organic depolarizer.

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THE STUDY ON EFFECT OF PARTICLE SIZE IN BOTANICAL STANDARD SAMPLE ANALYSIS BY SLURRY SAMPLING AND FLUORINATION ELECTROTHERMAL VAPORIZATION(ETV)-ICP-AES

Yong Chao QIN, Zu Cheng JIANG, Yun'e ZENG, Bin HU

中国化学快报. 1995, 6(04): 325-326.

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Abstract In this paper,the effect of partical size,in fluorination assisted ETV-ICP-AES.The results experimental show that when the partical size of slurry samples is less than 170μm,the signal intensities of analytes were identical to those obtained with aqueous solutions.Comparing with the data given by slurry nebulization ICP-AES in literature,the tolerable particle size in this method is large by about 17-fold.

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STUDY ON A NEW COMB POLYMER ELECTROLYTE (Ⅱ)

Li Ming DING, Yun Qing LIN, Xiao Guang SUN, Cheng Zong YANG, Fo Song WANG

中国化学快报. 1995, 6(04): 327-328.

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A comb polymer (CP350) with oligo-oxyethlene side chains was prepared from methyl vinyl ether/maleic anhydride copolymer.Homogeneous amorphous polymer electrolyte were made from the comb polymer and LiCF₃SO₃ by solvent casting from acetone,and their conductivities were measured as a function of temperature and salt concentration.Maximum conductivity close to 5.08×10^-5S/cm was achieved at room temperature at [Li]/[EO] ratio of about 0.12.

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STUDY ON COMBLIKE POLYMER ELECTROLYTE

Li Ming DING, Yun Qing LIN, Hong Ze LIANG, Fo Song WANG

中国化学快报. 1995, 6(04): 329-332.

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New comblike polymers (CP) have been synthesized by reacting monomethyl ether of polyethylene glycol (PEGME) with poly (methyl vinyl ether-alt-maleic anhydride) (MA) and endcapping the residual carboxylic acid with methanol.Butanone was selected as a solvent for the esterification reaction in order to obtain a completely soluble product.They were characterized by IR,¹³C NMR and elemental analysis.

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SUSTAINED RELEASE OF LEVONORGESTREL USING POLYPHOSPHATE AS DRUG CARRIER

Yi LUO, Ren Xi ZHUO, Chang Lie FAN

中国化学快报. 1995, 6(04): 333-334.

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ABSTRACT A novel crosslinking polyphosphate was synthesized.The polymer was characterized by FT-IR,¹HNMR,³¹PNMR and elemental analysis.In vitro release of Levonorgestrel by single-matrix and sandwich pellet with polyphosphate as drug carrier were carried out in pH 7.4 phosphate buffer solution at 37℃.Sustained release rate from the sandwich pellet was more controlled than that from single-matrix pellet.

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STUDY ON SOME NOVEL BIODEGRADABLE POLYPHOSPHATE ESTERS

Li Jian LIU, Ren Xi ZHUO, Yuan Zhao ZHANG, Xiang Yang SHI

中国化学快报. 1995, 6(04): 335-336.

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Abstract Eight water-insoluble polyphosphate esters were prepared.The degradation of the polyphosphate esters was enhanced either by the additional acetal bonds in polymer backbone or by the action of enzyme.

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SYNTHESIS OF ALLANTOIN USING HETEROPOLY COMPOUNDS AS CATALYSTS

Sui Mei ZHANG, Feng Lian ZHAO, Wei Qing WANG

中国化学快报. 1995, 6(04): 337-338.

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Allantoin was synthesized with the yield as high as 68.5% using H₃PW₁₂O₄₀·xH₂O as catalyst.Optimum conditions for the synthesis were determined.It was found that the heteropoiy compound has higher catalytic activity than conventional inorganic acid catalysts (such as hydrochloric acid,etc.)

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SYNTHESIS AND PROPERTIES OF THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS CONTAINING BIS (4-HYDROXYPHENYL) METHANONE (IV)

De Wen DONG, Ping HAN, Zhen Guo CHI, Yu Shan NI

中国化学快报. 1995, 6(04): 339-342.

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A series of thermotropic liquid crystalline copolyesters were synthesized by thermal polycondensation of p-hydroxybenzoic acid,terephthalic acid,bis (4-hydroxyphenyl)methanone and diols.The resulting copolyesters were characterized by WAXD,DSC and PLM.All the copolyesters formed a nematic phase.

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COMPARISON OF CATALYTIC REACTIVITIES OF TRIPHENYL-PHOSPHINE COMPLEXES OF Ru,Rh,Pd,Fe,Co,Ni IN THE MALEIC ANHYDRIDE HYDROGENATION

Ji Ping LI, Zhong Shan LI, Xin TIAN, Kai Hai YANG

中国化学快报. 1995, 6(04): 343-344.

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The sequence of homogeneous catalytic reactivity of triphenylphosphine complexes of Ru,Rh,Pd,Fe,Co,Ni in the maleic anhydride hydrogenation is:RuCl₂ (PPh₃)3) > RhCl (PPh₃)₃ > NiCl₂ (PPh₃)₂ > CoCl₂ (PPh₃)₂ > FeCl₂ (PPh₃)₂ > PdCl₂ (PPh₃)₂.This is consistent with the metal atoms' ionization potentials.

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EFFECT OF CATALYST PRETREATMENT ON THE OXIDATION OF CARBON MONOXIDE OVER Au/NiO CATALYST

Zheng Ping HAO, Li Dun AN, Jun Ling Zhou, Hong Li WANG

中国化学快报. 1995, 6(04): 345-346.

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Au/NiO was prepared by coprecipitation and subjected to various heat and oxygen pretreatment prior to being used to promote carbon monoxide oxidation.The most active catalyst was obtained by heating in oxygen at 300℃ before use and can convert CO into CO₂ completely at 30℃.The relative activities of these catalysts depended on the degree of heating and oxygen exposure before use.

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OXIDATIVE DEHYDROGENATION OF ETHANE (ODE) OVER LaOF CATALYST PROMOTED WITH BaF₂

Xiao Ping ZHOU, Zi Sheng CHAO, Hui Lin WAN, Khi Rui TSAI

中国化学快报. 1995, 6(04): 347-348.

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The addition of BaF₂ into LaOF catalyst significantly improves the catalytic properties of LaOF for the ODE reaction.

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SYNTHESIS OF Mg-Al LAYERED DOUBLE HYDROXIDES PILLARED WITH POLYOXOMETALATES

Jun GUO, Jian Ping SHEN, Tie SUN, Da Zhen JIANG, En Ze MIN

中国化学快报. 1995, 6(04): 349-352.

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ABSTRACT Mg-Al layered double hydroxides pillared with various polyoxometalate anions were synthesized by direct ion-exchange reactions of Mg/Al-LDH with POMs at acidic pH conditions.

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RUTHENIUM COORDINATION COMPOUNDS WITH POLYPYRIDYL:Ⅱ THE INTERACTION OF RUTHENIUM (Ⅱ)MIXED-LIGAND COORDINATION COMPOUNDS CONTAINING PYRIDO [3,2-f] [1,7]PHENANTHROLINE WITH CALF THYMUS DNA

Lei WANG, Jian Ying ZHOU, Jin Ying WANG, Tian Xian ZEMG, Liang Nian JI

中国化学快报. 1995, 6(04): 353-356.

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ABSTRACT The binding of RuL₂ pdphen²⁺ to calf thymus DNA was investigated using absorption fluorescence and CD spectroscopies,where pdphen is the planar ligand pyrido [3,2-f] [1,7] phenanthroline,L=2,2'-bipyridine,phenanthroline,2,9-dimethyl-phenanthroline and 5-nitro-phenanthroline.All coordination compounds show absorption hypochromicity associated with binding to calf thymus DNA.Ru (bipy)₂pdphen²⁺ and Ru (phen)₂pdphen²⁺ also show fluorescence intensities and excited state lifetime increase becanse of the interaction of coordination compounds with calf thymus DNA.CD spectra of dialyzates indicate enantioselectivity associated with binding to DNA.

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THE EXCITED STATES AND VIBRATIONAL FREQUENCIES OF Bli₂^e (e=0,+1,-1)CLUSTERS

Hua Bei ZHANG, An Min TIAN, Guo Sen YAN

中国化学快报. 1995, 6(04): 357-360.

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可视化

In the present work,16 states for BLi₂,BLi₂⁺ and BLi₂^- are found first.Their geometrical structures are determined by energy gradient method using a double-zeta plus polarization (DZP) basis set,and a diffuse(s,p) basis set having exponents of 0.0315 is added to the B atom.The correlation energy obtained for each state is considered with the configuration interaction (CISD) technique.The normal vibrational frequencies are performed using numerical method.The states ³Ⅱ_■,¹△_■,¹B₂ and ¹B₂ for BLi₂⁺ are transition states.The state ¹△_■ for BLi₂^- is unstable.Other states are stable.

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1995年, 第6卷, 第04期　刊出日期：1995-04-20

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本期目录

1995年, 第6卷, 第04期 刊出日期：1995-04-20

1995年, 第6卷, 第04期　刊出日期：1995-04-20