中国化学快报

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Intramolecular Oxidative Transformations of 1,4-Diary1-2,3-Dimethy1-2,3-Epoxybutane with DDQ

Jun Biao CHANG, A. T. McPHAIL, Man KONG, Jing Xi XIE

中国化学快报. 1996, 7(08): 691-692.

摘要 ( )

可视化

Treatment of 1.4-diaryl-2.3-dirnethyl-2, 3-epoxide of butane (1) with 2, 3-dichloro-5, 6-dicyano-1, 4-benzoquinone (DDQ) in trifluoroacetic acid (TFA) furnishes a new benzofuran type lignan (2). The structure of (2) was established by MS, IR, UV and NMR spectra, and X-ray crystallographic analysis.

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SYNTHESIS OF PEG-DENDRIMERIC PEPTIDE

De Xin WANG, Lei HUANG

中国化学快报. 1996, 7(08): 693-694.

摘要 ( )

可视化

Synthesis of a new macromolecule with MW up to 7.6 KDA is described in the present paper. The ligation between a dendrimeric amino-PEG and unprotected peptides via a site-specific reaction is a useful trial for the preparation of synthetic vaccine and related compounds.

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ASYMMETRIC MICHAEL-TYPE ALKYLATION OF CHIRAL IMINES DIASTEREOSELECTIVE SYNTHESIS OF (+)-α-CYPERONE AND (-)-10-EPI-α-CYPERONE

Zhao Ming XIONG, Jiong YANG, Yu Lin LI, Ren An LIAO, Zheng Ming LI

中国化学快报. 1996, 7(08): 695-696.

摘要 ( )

可视化

A novel diastereoselective route to (+)-α-cyperone (1) and (-)-10-epi-α-cyperone (2) has been developed. The key step involves an asymmetric Michael addition of the corresponding chiral imine, derived from R-(+)-dihydrocarvone (3), to ethyl vinyl ketone.

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HIGH REGIOSELECTIVE SYNTHESIS OF PARA MYRAC ALDEHYDE CATALYZED BY MODIFIED HY ZEOLITE UNDER MICROWAVE IRRADIATION

Dong Hong YIN, Du Lin YIN, Qian He LI

中国化学快报. 1996, 7(08): 697-698.

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可视化

The Diels-Alder reaction of myrcene and acrolein catalyzed by modified HY zeolite which was prepared by mixing HY zeolite and anhydrous ZnCl₂ under microwave irradiation was studied. High regioselectivity and good yield of para myrac aldehyde were obtained when the ratio of ZnCl₂/HY (w/w) was 1:2 to 1:3.

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SYNTHESIS AND CRYSTAL STRUCTURE OF 4,5-DIBROMO-o-OXYLYL-17-CROWN-5

Guo Xiang XIONG, Qing Fu ZHOU, Hui Jun Xu

中国化学快报. 1996, 7(08): 699-700.

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可视化

The title compound[C₁₆H₂₂Br₂O₅] (3). was synthesized and characterized by ¹H-NMR, MS and elemental analysis. Pale yellow prism crystallized from anhydrous ethanol solution was investigated by X-ray structural analysis. Crystal data:orthorhombic system, space group Pbca, Mr=454.2, a=17.664 (4) Å, b=8.625 (2) Å, c=24.269 (5) Å, z=8, Dc=1.632g/cm³, F (000) =1776. The structure was solved by direct methods and refined to final R=0.0362, Rw=0.0357 for 1029 observed reflections with F>6.0σ (F).

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SYNTHESIS OF (±)-FARNESYL FLAVANONE AND FARNESYL ACETOPHENONE

Chu Sheng HUANG, Xiu Ying LI, Ying LI, Yu Lin LI

中国化学快报. 1996, 7(08): 701-702.

摘要 ( )

可视化

Three new natural compounds, 6-farnesyl-3', 4', 5, 7-tetrahydroxyflavanone (1), 3-farnesyl-2, 4, 6-trihydroxyacetophenone (2) and 4-farnesyloxy-2, 6-dihydroxyacetophenone (3) were synthesized by starting from 2, 4, 6-trihydroxyacetophenone and famesyl bromide.

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THE APPLICATION OF Cu (facam)2 TO THE ASYMMETRIC CYCLOPROPANATION OF 2,5-DIMETHYL-2,4-HEXADIENE

Xu Hong CHENG, Zheng Ning LI, Hui Lin CHEN

中国化学快报. 1996, 7(08): 703-705.

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可视化

a new kind of catalyst, chiral β-diketone copper complex Cu (facam) ₂ was used for the first time for the asymmetric cyclopropanation of 2, 5-dimethyl-2, 4-hexadiene with alkyl diazoacetate to give the alkyl esters of chrysanthemic acids. This catalyst was prepared starting with camphor to achieve 86.7% of the products.

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AN ATTEMPT TO SYNTHESIZE HOMOCLAUSENAMIDE AND ZETACLAUSENAMIDE-Study of The Intramolecular Cyclization

Nian Chun MA, Ke Met WU, Liang HUANG

中国化学快报. 1996, 7(08): 706-708.

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可视化

Preliminary studies on the intramolecular cyclization of amides 11 and 15 in an attempt to synthesize the natural products homoclausenamide 1 and zetaclausenamide 2 were reported.

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ULTRASONICALLY DISPERSED POTASSIUM AS DEPROTONATING AND COUPLING AGENT——SYNTHESIS OF 1,6-DINITRILES IN SITU

Li Xin WANG, Ming Hua XU, Yao Zeng SHI, Hong Wen HU

中国化学快报. 1996, 7(08): 709-712.

摘要 ( )

可视化

Ultrasonically dispersed potassium (UDP) in toluene was found to be an effective deprotonating and coupling agent in the condensation of phenylacetonitrile with aldehydes;α, β-Unsaturated nitriles and their dimers 1, 6-dinitriles may be obtained by one-pot synthesis within few minutes.

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STUDIES ON THE STRURE OF LIGUSTIPHENOL FROM LIGUSTICUM SINENCE OLIV

De Quan YU, Feng Zhi XIE, Ruo Yun CHEN, Yan He HUANG

中国化学快报. 1996, 7(08): 711-712.

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可视化

Ligustiphenol (Ⅰ), a new sesquiterpenoid with bisabolane skeleton, has been isolated from the alcohol extract of roots of Ligusticum sinence Oliv, and its strcuture including absolute configuration established on the basis of spectral and chemical evidences.

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METALLIC GALLIUM-PROMOTED REFORMATSKY-TYPE REACTION

Ying HAN, Zheng Fa CHI, Yao Zeng HUANG

中国化学快报. 1996, 7(08): 713-716.

摘要 ( )

可视化

Gallium-mediated Reformatsky-type reactions gave ethyl esters of β-hydroxy acids, and ethyl esters of-α-vinyl-β-hydroxy acids in excellent yields and very high regioselectivity.

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TELOMERIZATION OF TETRAFLUOROETHYLENE AND CHLOROTRIFLUOROETHYLENE WITH TRICHLOROMETHANESULFONYL BROMIDE AS A TELOGEN

Wei Min FU, Yu ZBU, Si Xun SUN, Yu Huang ZHANG, Guo Zhen JI, Xi Kui JLANG

中国化学快报. 1996, 7(08): 717-720.

摘要 ( )

可视化

Trichloromethanesulfonyl bromide can be used as a telogen with tetrafluoroethylene and chlorotrifluoroethylene as monomers to give telomerized products CCl₃ (CF₂CF₂) _nBr and CCl₃ (CF₂CFCl) _nBr without an initiator.

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STRUCTURE OF HEMSLEYADINE

Qing Yan XU, Dong Lin CHEN, Feng Peng WANG

中国化学快报. 1996, 7(08): 723-724.

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可视化

A new norditerpenoid alkaloid, hemsleyadine, was isolated from the roots of Aconitum hemsleyanum var. circinatum. Structure of hemsleyadine was assigned as 1 by comparison of its ¹³C NMR data with known compounds.

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TWO NORDITERPENOID ALKALOIDS FROM ACONITUM LEUCOSTOMUM

Jian Min YUE, Jun XU, Han Dong SUN, Shao Nong CHEN, Yao Zu CHEN

中国化学快报. 1996, 7(08): 725-728.

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可视化

Two new norditerpenoid alkaloids leucostines A (1) and B (2) have been isolated from the root of Aconitum leucostomum. Their structures were elucidated on the basis of spectral data and chemical evidence.

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ELECTROCHEMICAL REDOX OF HEMOGLOBIN ON BARE SILVER ELECTRODE IN PRESENCE OF CETYL PYRIDINIUM CHLOMDE AND ITS MPLICATION IN ANALYSIS

Bac Xian YE, Xiao Rong TANG, Xing Yao ZHOU

中国化学快报. 1996, 7(08): 729-732.

摘要 ( )

可视化

The electrochemical redox reaction of hemoglobin on bare silver electrode using cetyl pyridinium chloride as promoter is described. The electrode reaction exhibits such a good stability that the peak currents change less than 8.5% (oxidation) and 10.2% (reduction) in continuing scan of 30 min in a solution containing 1×10^-7 mol/L hemoglobin. The rate constant Ks is 0.0865s^-1 with a single electron transfer. Moreover, both the oxidation and the reduction currents are linearly related with the hemoglobin concentration in the range of 1×10^-8~5×10^-7 mol/L. So, it can be used as an analytical method for determining hemoglobin.

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STUDIES ON THE DETERMINATION METHOD OF TRACE ELEMENTS IN THE FOSSIL OF DINOSAURIANEGG (Ⅰ)

Hong Tao YAN, Sheng Ke YANG

中国化学快报. 1996, 7(08): 733-734.

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可视化

A new method for the determination of trace iridium with catalytic laser thermal lensing spectrometry was developed. The method has been applied to the determination of the trace iridium in the fossil of dinosaurian egg in Nanyang region, China.

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FLUORESCENCE STUDIES ON SELF-ASSEMBLING BEHAVIOR OF AMPHIPHILES WITH NAPHALENE-1,5-DIOXY GROUP

Guo Wen LI, Ying Qiu LIANG

中国化学快报. 1996, 7(08): 735-736.

摘要 ( )

可视化

Fluorescene spectra in dilute aqueous solution of a series of single chain amphiphiles with an interposed naphthalene-1, 5-dioxy group were studied to elucidate the characteristic self-assembling behavior, which indicates the abrupt change in fluorescence intensity associated with phase transition of gel to liquid crystal.

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THE SUPPORTED GOLD CATALYST FOR REMOVING CARBON MONOXIDE AT AMBIENT TEMPERATURE

Zheng Ping HAO, Li Dun AN, Hong Li WANG, Ting Fang BAI

中国化学快报. 1996, 7(08): 737-738.

摘要 ( )

可视化

The supported gold catalysts have high activity, good resistance to moisture and sulfur poisoning for removing carbon monoxide from air at ambient temperature.

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HIGHLY ACTIVE CATALYSTS FOR CYCLOPROPANATION OF TETRAMETHYLETHYLENE

Zhuo ZHENG, Mei HAN, Hui Lin CHEN

中国化学快报. 1996, 7(08): 739-740.

摘要 ( )

可视化

Copper (Ⅱ) Schiff base complexes derived from aromatic amine and salicylaldehyde were found to be highly active catalysts for the cyclopropanation of tetramethylethylene with ethyl diazoacetate. 82% yield of cyclopropanation was obtained with one of the complexes as catalyst.

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BASICITY ON ZEOLITE NAX AFTER WATER HANDLING STUDIED BY TPD OF ORGANIC ACID

Ming SU, Ke Yi TAO, Ling Ping ZHOU, He Xuan LI

中国化学快报. 1996, 7(08): 741-742.

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可视化

In this paper the effect of ion-exchange simplified as water handling on basic zeolite was studied. It was found that the interaction between chemisorbed water and Na⁺-O^2- couple would increase the total number of basic sites, while weaken the intensity of each basic sites. The process can be explained by the adsorb model of organic acid on NaX presented before.

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AN ADSORB MODEL OF ORGANIC ACID ON BASIC ZEOLITE NAX

Ming SU, Ke Yi TAO, Ling Ping ZHOU, He Xuan LI

中国化学快报. 1996, 7(08): 743-744.

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可视化

The adsorb model of formic acid on NaX derived from TPD was discussed. It was showed that the adsorb sites were various exposed framework O^2- centers bearing different basic intensity and spatial resistance. The h-peak was attributed to O^2- near S_Ⅲ in supercage and l-peak to O^2- near S_Ⅱ in β-cage of faujusite zeolite. The model can explain the experimental results. Meanwhile, a relative standard of basic intensity based on TPD of formic acid was founded.

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ELECTRO-OXIDATION OF ETHANOL ON HIGHLY PREFERRED ORIENTATION NICKEL ELECTRODE IN N_aOH

Ling HUANG, Shu Kai XU, Shao Min ZHOU

中国化学快报. 1996, 7(08): 745-758.

摘要 ( )

可视化

The electro-oxidation of ethanol on a highly preferred orientation (220) Ni electrode and a lower texture degree Ni electrode in 1 mol/L NaoH was investigated with cyclic voltammetry. The mechanism of ethanol oxidation on the highly preferred orientation Ni electrode is proposed. It is shown that the current peak of electro-oxidation of ethanol on the highly preferred orientation (220) Ni electrode is much higher than that of the lower texture degree (220) Ni electrode, Ni (Ⅲ) on the surface of the highly preferred orientation (220) Ni electrode is responsible for the oxidation of ethanol.

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AEROBIC EPOXIDATION OF STYRENE CATALYZED BY MAGNESIUM OXIDE SUPPORTED POLYTITAZANE COBEST (Ⅲ) COMPLEXES

Yuan Yong YAN, Tie Jun WANG, Jian Ping GUO, Mei Yu HUANG, Ying Yan JIANG

中国化学快报. 1996, 7(08): 749-752.

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可视化

Magnesium oxide supported polytitazane-cobalt (Ⅲ) complex has been prepared and found to be capable of catalyzing the epoxidation of styrene to form styrene oxide in 88.0% yield in the presence of isobutyraldehyde under an atmospheric pressure of molecular oxygen at room temperature. XPS data shows that the high valent cobalt (Ⅲ) is stabilized by the multidentate nitrogen ligand of polytitazane. Dichloroethane is the best solvent chosen for this reaction. The catalyst can be reused for several times without any remarkable loss in catalytic activity and selectivity.

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MICROENVIRONMENTAL EFFECT ON THE INTRAMOLECULAR PHOTOCHEMICAL INTERACTION OF BIS-COUMARINYL COMPOUNDS CONTAINING ALKYL CHAINS

Huan GAO, Guo Chang WANG, Li Jun LIANG, Bing Lin HE, Da Ming DU, Yong Met WANG, Ji Ben MENG

中国化学快报. 1996, 7(08): 753-755.

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可视化

The intramolecular photochemical interaction of a series of bis-coumarinyl compounds with various alkyl chain lengths (A_n) has been studied in/without the presence of β-cy-clodextrin (β-CD) by fluorescence spectroscopy. The results show that both photodimerization and excimer formation can occur in the respective favourable microenvironments.

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RELATIONSHIP BETWEEN STRUCTURE AND SHAPE MEMORY EFFECT OF SEGMENTED POLYURETHANES

Feng Kui LI, Xian ZRANG, Mao XU, Xiao Lie LUO

中国化学快报. 1996, 7(08): 756-758.

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可视化

The shape memory behavior of a series of PCL/MDI/BDO segmented polyurethanes of different composition is presented. The molecular weight of the PCL diols is in the range of 1600-7000. It is found that the shape memory effect of segmented polyurethanes is really related with the crystallinity of the soft segment regions and the formation of stable hard segment domains as predicted by the model proposed in our previous papers.

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ASSESSMENT OF CRITICAL AGGREGATE CONCENTRATION (CA_gC) BY UV.A NEW METHOEOLOGY

Xin Yu ZRANG, Yu ZHU, Guo Zhen JI, Xi Kui JIANG

中国化学快报. 1996, 7(08): 759-762.

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可视化

A new and simple method for evaluating the critical aggregate concentration (CAgC) by measurement of the UV absorbance of the aggregator in solution has been established.

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MOLECULAR RECOGNITION BY MODIFIED CYCLODEXTRINS——FLUOROMETRIC STUDY ON THE INCLUSION COMPLEX OF CYCLODEXTRIN DERIVATIVES WITH NAPHTHALENE DERIVATIVES

You Ming ZHANG, Bao Jian SHEN, Lin Hui TONG

中国化学快报. 1996, 7(08): 763-766.

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可视化

The molecular recognition of the naphthalene derivatives of 2, 6-dimethyl-β-CD, (1);mono-[6-deoxy-6-(2-aminoethylamine)]-β-CD, (2) and mono-[6-deoxy-6-(6-aminohexylamine)]-β-CD, (3) was studied by fluorescence. The formation constants of the inclusion complexes were estimated based on the variation of fluorescent intensity and the modified Benesi-Hilde-brand equations.

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A REGRESSION STUDY ON THE INCLUSION OF CYCLODEXTRIN WITH BENZENE DERIVATIVES

Qing Xiang GUO, Shuang Hui LUO, Xiao Qi ZHENG, You Cheng LIU

中国化学快报. 1996, 7(08): 766-770.

摘要 ( )

可视化

A set of regression models have been established for the inclusion of substituted benzenes by α-and β-cyclodextrin with correlations of 0.96 and 0.94, respectively. The 1nK_a values calculated by the models are in agreement with those determined experimentally. The inclusion process is mainly driven by the van der Waals force and the hydrophobic interactions.

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A NEW EMPIRICAL EQUATION ON CORRELATION BETWEEN TOPOLOGIC INDEX AND PHYSICO-CHEMICAL PROPERTIES OF NORMAL PARAFFINS

Cai Hua NI, Xian Yu ZENG, Ping MEI

中国化学快报. 1996, 7(08): 771-772.

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可视化

An empirical equation to reveal relations between topological index (Z_G) and physico-chemical properties of normal paraffins is proposed as follows:P=a lg Z_G/N^x+b, where P stands for a physico-chemical property, N is the number of carbon atoms in the molecule, and Z_G is the topological index proposed by Hosoya, a, b, and x are constants related to a certain physico-chemical property. Thirteen properties are calculated using this equation. The values of these properties calculated are close to those from experiments.

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THE INTRAMOLECULAR STACKING INTERACTION IN TERNARY COMPLEXES FORMED BY AND HETEROAROMATIC N-BASE LIGANDS

Fu Hai WU, Xue Yi LE, Fen Yun SONG, Liang Nian JI

中国化学快报. 1996, 7(08): 773-776.

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可视化

The stability constants of binary ML²⁺ complexes formed by Zn²⁺ or Cd²⁺ (M²⁺) and isoquinoline or benzimidazole (L) and ternary M (ATP) L^2- complexes containing ATP in addition were determined by potentiometric pH titration in aqueous solution. It has been found that there is an intramolecular stacking interaction between the heteroaromatic N-Base ligands and the base part of ATP in the ternary complexes, this interaction may have relation to the structure of the aromatic rings of the L ligands.

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SYNTHESIS AND ANTI-HIV-1 ACTIVITY OF HETEROPOLY COMPLEXES OF TUNGSTOTITANOPHOSPHATES CONTAINING RARE EARTH ELEMENTS

Shu Xian LIU, Bai Tao LI, Li WANG, Yan Yong LIU, En Bo WANG, Yi ZENG, Ze Lin LI

中国化学快报. 1996, 7(08): 777-778.

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可视化

The present paper reports nine new heteropoly compounds of tungstoti-tanophosphates containing rare earth elements, i.e., Ln₂H[PT_i2W₁₀O₄₀]·xH₂O (Ln=La, Ce, Pr, Nd, Sm, Gd, Tb, Yb, Lu). The above compounds have shown good effects on restraining proliferation of MT-4 Cell and anti-HIV-1 activity with low toxicity.

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STUDY ON CONDUCTIVITY OF TRISUBSTITUTED HETEROPOLYTUNGSTATES GaW₉M₃

Xin Wu YU, Shu Xia LIU, Li WANC, Ge WANG, Xiu Li WANG, En Bo WANG

中国化学快报. 1996, 7(08): 779-780.

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可视化

A new type of high proton conductor with the character of high conductivity and wide stable range for heat were reported, a value reaching 10^-3 S·cm^-1 at room tempra-ture.

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COMPUTERIZED PREDICTION AND SYNTHESIS OF TERNARY COMPOUND ZKBr 3MnSO₄

Xue Ye WANG, Chong He LI, De Shan KANG, Qian Bao ZHAN, Lin Hong LIU, Nian Yi CHEN

中国化学快报. 1996, 7(08): 781-784.

摘要 ( )

可视化

Pattern recognition or back-propagation algorithm of three-layer artificial neural network with chemical bond parameters as features or inputs was applied to reciprocal ternary Me^-. Me^2-X^-, X^2- type. The formability of ternary compounds in molten salt type was investigated. Computerized prediction indicates that the K, Mn|Br, SO₄ system can form a ternary compound. The new compound was confirmed by experimental work, and its formula is 2KBr 3MnSO₄.

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1996年, 第7卷, 第08期　刊出日期：1996-08-20

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1996年, 第7卷, 第08期 刊出日期：1996-08-20

1996年, 第7卷, 第08期　刊出日期：1996-08-20