中国化学快报

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SYNTHESIS AND CARBON TRANSFER REACTIONS OF 12-DIMETHYL-3-ARYLSULFONYL (ARYL=p-TOLYL PHENYL)-△²-IMIDAZOLINIUM IODIDE

Chi Zhong XIA, Hong Xing WANG, Pei Wen ZHOU, Jing Fan DING

中国化学快报. 1992, 3(06): 407-408.

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As models of 5, 10-methenyl-tetrahydrofolate coenaymes imidazolinium salts 6a, b were synthesized and their carbontransfer reactions with several types of nucleophiles were studied

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CHBMISTRY OF HYODEOXYCHOLIC ACID 5.CONCISE SYNTHESIS OF 25-HYDROXYCHOLESTEROL FROM HYODEOXYCHOLIC ACID, A KEY INTERMEDIATE OF 25-HYDROXYVITAMIN D₃

Zhong Qi WANG, Li Zhong JIANG, Wei Shan ZHOU

中国化学快报. 1992, 3(06): 409-410.

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25-Hydroxycholesterol, which is an important intermediatefor the synthesis of 25-hvdroxyvitamin D₃ and 1α, 25-dihydroxyvitamin D₃,was prepared efficiently from hyodeoxycholic acid in 31% overall yield inseven steps

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STUDIES ON THE WITTIG REACTION(XIII):KINETICS OF THE PTC-WITTIG REACTIONS OF 2-BUTENYL METHYL-DIPHENYLPHOSPHONIUM SALT WITH SUBSTITUTED BEN2ALDEHYDES

Wen Fang HUANG, Ming Wu DING, Wen Jing XIAO, Tian Jie WU

中国化学快报. 1992, 3(06): 411-414.

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The kinetics of PTC-Wittig reaction between substitutedaromatic aldehydes and 2-butenyl methyldiphenylphosphonium salthas been studied.The low reaction constant (ρ=0.30) impliesthat these PTC-Wittig reactions take place through low polarintermediate

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A NEW METHOD FOR x-ACETYLTHIOFORMANILIDES

Da Qing SUN, Dong FANG, Zhong E LU, Kei Qian CHEN, Hai, Tao XU

中国化学快报. 1992, 3(06): 415-416.

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In this paper, we report a new method for preparing acetylthioformanilides from substituted pyruvanilides an Lawessow Reagent.in DME at room temperature.Some new x-acetylthioanilides aresynthesized by this method

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MAGNESIUM-NETHAN0L REDUCTION OF 2-(1, 3-DITHIAN-2-YLIDENE)-I-ARYL KETONES:A FACILE ROUTE TO α-ARYL-β-(1,3-DITHANE)ALCOHOLS

Yu Lan HU, Qun LIU, De Neng DONG

中国化学快报. 1992, 3(06): 417-418.

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In a facile procedure, 2-(1, 3-dithian-2-ylidene)-l-arylketones 1 vere reduced with magnesium in methanol to give α-aryl-β-(1, 3-dithane) alcohols 2 in good to high yields

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A NEW METHOD FOR THE AROMATIZATION OF 18-METHYL-ESTRA-4(5), 9(10)-DIEN-3,17-DIONE

Guang Disn HAN, Hong Yau WEN

中国化学快报. 1992, 3(06): 419-420.

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An aromatization reaction was found when 18--methyl--estra--4(5),9(10)--dien--3, 17--dione(6) was treated with triethyl orthoforrnate in dioxane in thepresence of catalytic amount of p--toluenesulfonic acid (TsOH), and 18--methyl--9(11)--dehydroestrone--3--ethyl ether (8) was obtained in 70% yield.The mechanism wasfound to be a process of etherification--oxidation reaction

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SOLVENT PARTICIPATION OF WITTIG OLEFINATION REACTION IN METHANOL

Shi Zhi CHEN, Chang Jiu ZHANG, Liang HUANG

中国化学快报. 1992, 3(06): 421-422.

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Wittig reaction in methanol was investigated, and a possiblemechanism was proposed

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STUDIES ON COMPLEXES OF RARE EARTHS WITH CROWN ETHERS(V)-SYNTHESIS AND CHARACTERIZATION OF THE COMPLEXES OF RARE EARTH NITRATES WITH 2,2'-DINITRO-4,5,4',5'-BIS-(15-CROWN-5)-DIBENZO DISULFIDE

You Ming ZHANG, Ai Ru LU, Lian Xiang ZHAN, G, Wan Tian ZHAO, Liu Fang WANG

中国化学快报. 1992, 3(06): 423-424.

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Three new solid complexes of macrocyclic polyether ligand 2, 2'-dinitro-4, 5, 4', 5'bis-(15-crown-5)-dihenzo disulfide(L) with trivalent rare earth nitrates having composition of RE(NO₃)₃ړLړ6H₂O(RE=Ce, Pr, Nd) have been synthesized in acetonitrile.All the isolated complexes have beencharacterized by elementary analysis, IR and UV spectra, differential thermal and thermogravimetricanalysis, X-ray powder diffraction analysis, molar conductance and measurements of solubility insome general solvents

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ISORHYNCHOPHYLLIC ACID,A NEW AIKALOID FROM UNCARIA SINENSIS

Hong Mei LIU, Xiao Zhang FENG, Yang LU, Qi Tai ZHENG

中国化学快报. 1992, 3(06): 425-426.

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From the hook of Uncaria sinensis, a new alkaloid, isorhynchophyllicacid was isolated and its structure was elucidated by spectral data and chemicalreaction

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THE CHEMICAL STRUCTURES OF SPIRAMINEN AND SPIRAMINOL

Xiao Jiang HAO, Jun ZHOU, Kaoru FUJI, Manabu NODE

中国化学快报. 1992, 3(06): 427-430.

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Two new Components, spiramine N (1) and spiraminol (2) were isolated fromSpiraea japonica var.aecuminata Franch.Their structureswere elucidated bychemical and spectxalmeans

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NEW MINOR STEROIDAL SAPONINS FROM SMILAX LEBRUNII

Zhong Jian JIA, Yong JU, Mei DU

中国化学快报. 1992, 3(06): 431-432.

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Two new minor steroidal saponins, (25R) spirostan-3β-ol-6-one-3-O-[α-L-arabinopyranosyl(1-4)]-β-D-glucopyranosidc (1) and (25S) spirost-5-en-3β, 17α, 27-triol-3-O-[α-L-arabinopyranosyl(1-6)]-β-D-glucopyranosidc (2) were isolated from the roots of Smilax lebrunii.Theirstructures were established on thc basis of chemical and spectral methods

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STEROIDAL ALKALOIDS FROM SARCOCOCCA VAGANS

Ming Hua CHIU, De Yong CAO, Zhong Rong LI, Rui Lin NIE

中国化学快报. 1992, 3(06): 433-434.

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A new steroidal alkaloid, vaganine A (1) was isolated togetherwith a known compound paohysandrine A (2) from Sarcooocca vagans.Theirstructures were determined by spectroscopic evidence

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A NEW DITERPENE LACTONE FROM TRIPTERYGIUM WILFORDII

De Quan YU, Feng Zhi XIE, Xiao Tian LIANG

中国化学快报. 1992, 3(06): 435-436.

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A new diterpene lactone with an ent--kaurane skeleton, named antriptolactone(1)was isolated from the roots of Tripterygium wilfordii cellected in Anhui province.Its structurewas elucidated by spectral data and chemical transformtion

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THROUGH-SPACE AND THROUGH-BOND INTERACTIONS IN 1,5-CYCLOOCTADIYNE;THE ASSIGNMENT OF ITS PHOTOELECTRON SPECTRA

Han Xing LIU, Chia Chung SUN

中国化学快报. 1992, 3(06): 437-440.

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The through--space and through--bond interactions in 1, 5--Cyclooctadiyne arestudied.It is shown, with the assistance of improved MS--X_α method, that the through- spaceinteractions decrease with the distance of the orbitals, and both through--space and through--bondinteractions of 1, 5-Cyclooctadiyne are sizable but those two interactions oppose each othercausing the net splitting to be small for π_z orbital.The calculated ionization potentials are in goodagreement with the experiment of photoelectron spectra

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APPLICATION OF IMPROVED MS-X_α METHOD TO d-d TRNSITION ENERGIES OF TRANSITION-METAL COMPLEX

Han Xing LIU, Bo Fu LI, Chia Chung SUN

中国化学快报. 1992, 3(06): 441-444.

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Based on X_α multiple scattering one-electron wave functions, a way for solvingthe many-electron Schr?dinger equation by means of irreducible tensor method is reported.As anapplication, the analysis of the spectra of molecule NIF₆^4- is presented

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THE FRONTIER ORBITALS OF BUCKMINSTERFULLERENE C₆₀

Ji Min YAN, Xue Qi YI

中国化学快报. 1992, 3(06): 445-448.

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可视化

The frontier orbitals HOMO and LUMO of the fullerene C₆₀ hasbeen given in a system of 60 motion-coordinates, of which each origin is ateach C atom of fullerene C₆₀ and each z-axis is in the directionperpendicular to C₆₀'S spherical surface.In this motion-coordinate systemthe HOMO and LUMO of fullerene C₆₀ obviously display characteristics ofspherical n-molecular orbitals π_n.The Fenske-Hall quantum-chemical methodis used in calculation for the electronic structure of the fullerene C₆₀

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INVESTIGATION ON IMPROVED OSCILLOGRAPHIC CHRONOPOTENTIOMETRY

Jun Jie ZHU, Jian Bin ZHANG, Shu Ping BI, Hong GAO

中国化学快报. 1992, 3(06): 449-452.

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This paper presents a new method called improved oscillographicchronopotcntiometry.It changes the incision of dE/dt-E curve into a peak shape and hasthe advantages of good reproducibility and wider linear range

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INVESTIGATION ON MICROELECTRODES Ⅻ THE DETERMINATION OF THE INVERSE CURRENT IN THE PROCESSES OF STEADY-STATE OR QUASI-STEADY-STATE

Huaug Xian JU, Hong Yuan CHEN, Hong GAO

中国化学快报. 1992, 3(06): 453-456.

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A simple method for determining the inverse current of cyclic voltammetry inthe processes of steady-state or quasi-steady-state was presented.The experimental resultverified the theoretical relation or inverse and forward current at microelectrode.Their ratio isproportional to the square root of scan rat

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A NOVEL DERIVATIVE OF β-CYCLODEXTRIN AS CHIRAL SIATIONARY PHASE IN CAPILLARY GAS CHROMATOGRAPHY

Yuan De LONG, Xing Wu KANG, Tian Bao HUANG

中国化学快报. 1992, 3(06): 457-458.

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A novel β-cyclodextrin derivative, 2, 6-di-O-butyl-3-O-acetyl-β-cyclodex-trin, was prepared and used as chiral stationary phase for capillary gas chromato-graphic resolution of enantiomers, lhe glass capillary columns with the derivativehaving low melting point and high thermal stability could produce more than 3000plates per column meter and have proven to be good chlral columns to separate theenantiomers of some amino acids, derivatives of epoxy ethane and alkyl halide, etc

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SYNTHESIS AND STRUCTURE OF A MIXED-VALENCE HEXAMOLYBDENUM COMPLEX [Et₄N]₂[Mo₆O₁₉H₄]

Shu Jia LI, Heng Bin ZHANG, Shu Yun NIU, Guang Di YANG, Fu NIE

中国化学快报. 1992, 3(06): 459-462.

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可视化

A hexamolybdenum complex, [Et₄N]₂[Mo₆O₁₉H₄] crystal, withpentavalent and hexavalent molybdenum has been obtained in the solution ofDMF and CH₃OH as organic solvents using MoCl₅ as a starting material.Thecrystallographic parameters obtained by X-ray diffraction analysis are:crthorhombic, a=10.757(3), b=10.763(2), c=14.238(4)?, =1648.9?₃; Z=2; spacegroup Pnnm; final R=0.047; final Rw=0.051**

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KINETIC STUDY ON THE EXTRACTION OF PALLADIUM(Ⅱ) WITH BIS(2-ETHYLHEXYL)SULFIDE

Jian Sheng GU, Jian Hua PAN, Han Zhang WANG

中国化学快报. 1992, 3(06): 463-464.

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The effects of concentration, temperature, stirring rate and specific interfacial area onthe extraction of Pd (Ⅱ) with bis(2--ethylhexyl) sulfide (DEHS) were studied by the use of aconstant interracial area cell.The results support an interracial chemical reaction regime

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THE SENSITIVITY OF RESPONSE SIGNAL OF SPECTROELECTROCHEMISTRY(SEC)

Yuan Bao ZHU, Qing Ji XIE, Lian Hong CHEN, Shuang E HE

中国化学快报. 1992, 3(06): 465-466.

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In this paper, we propose the use of the molar absorbance/potential ratio to measure quantitatively the sensitivity of response signalof SEC cell and the system under study.A simple equation was developed, andthe major factors influencing the sensitivity were also assessed.Theresults obtained this way were in good agreement with actual cases

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ENZYME-LIKE ESTEROLYTIC ACTION OF ALGINATE-COBALT(Ⅱ)COMPLEX MEMBRANE

Bing Hui WANG, Can Hui LU, Wen Ding CHEN

中国化学快报. 1992, 3(06): 467-470.

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The investigation of the esterolysis of p-nitrophenol acetate (PNPA) catalyzedby alginate-cobalt(Ⅱ) complex membrane was carried out under various conditions.Theresults showed that the pseudo-first-order plots of the hydrolyses of PNPA catalyzed byalginate-Co(Ⅱ) complex membrane were linear.The kinetic constants were obtained andshowed that the hydrolysis reactions obeyed Michaelis-Menten equations, showing anenzyme-like catalytic function of the membrane

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KINETICS OF LASER INDUCED PYROLYTIC DEPOSITION FROM Mn₂(CO)₁₀

Wu Min WANG, Hui Qi HOU, Qi Zong QIN

中国化学快报. 1992, 3(06): 471-472.

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An optical transmission method was used in-situ to measure therate of pyrolytic deposition from Mn₂(CO)₁₀ induced by a CW CO₂ laser.Theeffect of the laser intensity, Mn₂(CO)₁₀ vapor pressure and addedgases (CO, O₂ and Ar) on the deposition rate has been examined

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SYNTHESIS AND CHARACTERIZATION OF FOUR NOVEL TYPES OF MICROPOROUS BERYLLOPHOSPHATE(Ⅱ)

Long YU, Shu Qing LI, Wen Qin FANG

中国化学快报. 1992, 3(06): 473-476.

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Four new types of microporous beryllophosphates werehydrothermally synthesized using BeO- P₂O₅- R- MCl (or MCl₂)- H₂0, Rbeing HMDA (1, b-hexanediamine), EDA (ethylenediamine), or TBAOH(tetrabutytamine hydroxide), M alkali or alkali earth cation.By means ofX-ray diffraction patterns (XRD), infrared (IR), TG-DT and elemental analyseswe show that the crystalline beryllopbospbates have novel, unique frameworkstructures, composed from basic units of tetrahedral P0₄ and Be0₄.Thesematerials exhibit zeolite-like adsorption and ion-exchange properties

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SEPARATION OF FORMIC ACID-WATER AZEOTROPIC MIXTURES BY MEMBRANE DISTILLATION

Ying KONG, Yong Lie WU, Ji Ping XU

中国化学快报. 1992, 3(06): 477-478.

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The azeotrope disappeared when the formic acid-water mixtureswere treated by membrane distillation.Membrane distillation were used forseparation of formic acid-water azeotropic mixtures for the first time

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HIGH CONDUCTIVITIES OF LANGMUIR-BLODGETT FILMS OF TBT-TTF-NI(DMIT)₂/STEARIC ACID

Yu Fang XIAO, Zhong Qi YAO, Dao Sen JIN

中国化学快报. 1992, 3(06): 479-482.

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Conductivities of Langmuir-Blodgett(LB) films of tetrabenzylthio-tetra-thiafulvalence-Ni(dmit)₂/stearic acid (SA)were described.This chargetransfer complex was transferred with SA onto a glass plate coated with A1electrodes.The relation of conductivities of LB films with molar ratio ofSA was studied.The conductivities of LB films of TBT-TTF-Ni(dmit)₂/SA weremeasured under undoped and I₂ doped states.The maximum conductivity （σ,’）of LB film was 40s/cm

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KINETICS OF NON-ISOTHERMAL CRYSTALLIZATION OF NYLON-1010

Xiao Fu XUE, Bao Quan YANG, Zhi Shen Mo

中国化学快报. 1992, 3(06): 483-484.

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可视化

The kineties of non-isothermal crystallization of Nylon-1010 has been investigated by usingdifferential scanning calorimetry(DSC), DSC curves were obtained under cooling rate(R):2.5, 5, 10, 20, 40K/min.Applying Mandelkern and Ziabicki theories, the values of the Z kinetic parameter and G the kinetic crystalllzab-ility have been determined.Expenents of Avrami obtained in this work decrease with increase of coolingrate and then level off.The experimental results show disagreements with the Ozawa equation

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1992年, 第3卷, 第06期　刊出日期：1992-06-20

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1992年, 第3卷, 第06期 刊出日期：1992-06-20

1992年, 第3卷, 第06期　刊出日期：1992-06-20