中国化学快报

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Silver(I)-promoted Oxidation and Ring-enlargement Reactions of Unstrained Hydrocarbons, Polyphenyl-cyclopentadiene

Xin Cheng LI, Gui Ling NING, Liang Ping WU, Ji Hong SHAN, Yuan LIN

中国化学快报. 2002, 13(12): 1141-1142.

摘要 ( )

可视化

A unique sliver (I)-promoted oxidation reaction of polyphenyl-cyclopentadiene is described, in which an oxygen is inserted into the cyclopentadiene-ring, forming a six-membered pyrylium cation.

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Asymmetric Cyclopropanation Catalyzed by Four Stereoisomers of a Copper-(Schiff-base) Complex with Double Chiral Centers

Chang Sheng JIANG, You Gui LI, Chen JIANG, Fang WANG, Tian Pa YOU

中国化学快报. 2002, 13(12): 1143-1146.

摘要 ( )

可视化

Four stereoisomers of a copper-(Schiff-base) complex with double chiral centers were applied to catalyze the asymmetric cyclopropanation. Two of the stereoisomers were also efficient catalysts affording high enantiomeric excess of up to 91.8%. A mechanism that predicts the observed results accurately was proposed.

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Convenient Asymmetric Borane Reduction of Ketones Catalyzed by Simple Amino Alcohols and Corresponding Amino Acids

Guo Bin SUN, Wei Wei PEI, Hui WANG, Wei Ping YE

中国化学快报. 2002, 13(12): 1147-1148.

摘要 ( )

可视化

An asymmetric borane reduction of prochiral ketones catalyzed by simple amino alcohols and corresponding amino acids was examined to give alcohols with e.e. value up to 92%.

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A Facile and Efficient Synthesis of N,N-Dimethylarylamines from Aryl Bromides

Jian Kui ZHAO, Yan Guang WANG

中国化学快报. 2002, 13(12): 1149-1151.

摘要 ( )

可视化

Catalytic amination of aryl bromides with in situ generated dimethylamines from N,N-dimethylacetamide (DMA) has been successfully carried out using Ni(Phen)Cl₂ as catalyst. Both electron-rich and electron-poor aromatic system reacted smoothly under the conditions to give N,N-dimethylarylamines in good yields.

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Attempt to Built 13-Hydroxy-9,15-cyclo GA Skeletons

Jian Ping LIU, Lewis N. MANDER

中国化学快报. 2002, 13(12): 1152-1153.

摘要 ( )

可视化

An easy and mild way to construct 13-hydroxy-9,15-cyclo GA skeletons was reported and it could be used as a general protocol in the synthesis of GAs with this structure.

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An Improved Synthesis of Laminin Fragment CR9

Gui Jie TIAN, Shi Jun LI, De Xin WANG

中国化学快报. 2002, 13(12): 1154-1157.

摘要 ( )

可视化

Laminin nonapeptide CR9 was synthesized via two different methods. A notably enhanced yield (46.8%) was obtained from method B compared to that (12.4%) from standard protocol (method A).

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Synthesis of a Polymer-bound Sensitizer and its Application in the Photoisomerization of trans-Vitamin D₃ to cis-Vitamin D₃

Yun Yan GAO, Chang Jiang YOU, Jin Ping CHEN, Yong Yong LIU, Bao Wen ZHANG, Yi LI

中国化学快报. 2002, 13(12): 1158-1161.

摘要 ( )

可视化

A polymer-bound photosensitizer was synthesized by the reaction of Merrifield resin with 9-anthracenemethanol in the presence of potassium hydride. The photoisomerization of trans-vitamin D₃ to cis-vitamin D₃ was carried out with this polymer-bound photosensitizer in ethanol and toluene solutions. The experiment results demonstrate that this solid photosensitizer is efficient for the photoismerization and easy for separation from the reaction mixtures.

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The Oxidation of Cyclohexene with Polymer Supported Co(II) in Supercritical Carbon Dioxide

Jun LIU, Rui ZHANG, Liang GAO, Tao JIANG, Zhi Min LIU, Jun HE, Bu Xing HAN, Guan Ying YANG

中国化学快报. 2002, 13(12): 1162-1163.

摘要 ( )

可视化

The cyclohexene 1 was oxidized with polymer-supported 2.2'-bipyridine cobalt(II) complex in the presence of CO₂. The conversion and selectivity was sensitive to the pressure of CO₂.

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(Z)-α-Selanyl Alkenyl Grignard Reagents as Convenient Precursors for Stereoselective Synthesis of Trisubstituted Alkenes

Ming Zhong CAI, Chun Yun PENG, Jia Di HUANG

中国化学快报. 2002, 13(12): 1164-1167.

摘要 ( )

可视化

(Z)-α-Selanyl alkenyl Grignard reagents 2 were prepared conveniently by treatment of α-bromovinylselenides 1 with magnesium filings in THF. Intermediates 2 were reacted with alkyl iodides in the presence of CuI or Pd(PPh₃)₄ to afford (Z)-1,2-disubstituted vinylselenides 3,which were cross-coupled with Grignard reagents in the presence of (PPh₃)₂NiCl₂ to give trisubstituted alkenes 4 stereoselectively in good yields.

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Synthesis and Transesterification of the Complexes of Methyl 2-Methyl-3-trichlorostannylpropoinate with Benzylmethylsulfoxide

Lai Jin TIAN, Zhi Cai SHANG, Qing Sen YU, Wen Na ZHAO, Bing ZHANG

中国化学快报. 2002, 13(12): 1168-1169.

摘要 ( )

可视化

The title complex, Cl₃SnCH₂CH(CH₃)CO₂CH₃·L (1), was synthesized by the reaction of methyl 2-methyl-3-trichlorostannylpropionate with benzylmethylsulfoxide (L) in solid state at room temperature and readily underwent transesterification into the corresponding analogues Cl₃SnCH₂CH(CH₃)CO₂R·L when reacted with an alcohol ROH. The structural features of these compounds were described, and the possible mechanism of transesterification was suggested.

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Highly Efficient Degradation of Thiophosphate Pesticides Catalyzed by Cyclopalladated Ferrocenylketimines

Jing Chao TAO, Jun JIA, Xing Wang WANG, Song Tao ZANG

中国化学快报. 2002, 13(12): 1170-1173.

摘要 ( )

可视化

In this paper, four functional substituted derivatives of cyclopalladated ferrocenylketimines 1~4, which were as mimetics of metal-dependent esterases for catalyzing the hydrolysis of thiophosphoric acid esters pesticides, were synthesized and characterized. All the four cyclopalladated complexes can efficiently catalyze the degradation of thiophosphoric acid pesticides, such as methyl parathion. The Pd catalyst with coordinated oxime is more active and exhibits an increased selectivity towards sulfur containing pesticides.

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Silazyl-Lithiums:A kind of new Initiators for the Anionic Nonequilibrium Ring-opening Polymerization of Octamethylcyclotetrasiloxane (D₄)

Shun Xing SU, Zhi Jie ZHANG, Zhi Min ZHENG, Ze Min XIE

中国化学快报. 2002, 13(12): 1174-1177.

摘要 ( )

可视化

The initiation reactions in the anionic non-equilibrium polymerization of octamethylcyclotetrasiloxane (D₄) initiated by silazyllithiums were investigated. It was found that the structure of the substituents on the Si atom had great influences on the initiation activity of silazyllithiums.

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Studies on the Structure of Kansuinine A from Euphorbia kansui

Qin PAN, Zhi Da MIN

中国化学快报. 2002, 13(12): 1178-1180.

摘要 ( )

可视化

Kansuinine A is a macrocyclic jatrophane diterpene that was isolated from Euphorbia kansui. Further investigation of the structure was revealed that the benzoyl group located at C-8 and the position of C-3 was the present of an acetyl group by means of HMQC, HMBC spectra.

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Two New Triterpene Esters from Daphniphyllum oldhami

Zhi Yu SHAO, Da Yuan ZHU, Yue Wei GUO

中国化学快报. 2002, 13(12): 1181-1184.

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可视化

Two new triterpene esters, 2-O-caffeoylalphitolic acid (1) and methyl 2-O-caffeoylalphitolate (2), together with two known triterpenes were isolated from the shrub Daphniphyllum oldhami. The structures of new compounds were elucidated on the basis of detailed spectroscopic analysis and compared with related compound.

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Two New Furostanol Glycosides from Asparagus cochinchinensis

Yong Chun YANG, Sheng Yang HUANG, Jian Gong SHI

中国化学快报. 2002, 13(12): 1185-1188.

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可视化

Two new furostanol oligoglycosides named as aspacochioside A (1) and B (2) were isolated from the roots of Asparagus cochinchinensis (Lour.) Merr.. Their structures were elucidated to be 3-O-[{α-L-rhamnopyranosyl-(1→4)}{β-D-glucopyranosyl}]-26-O-[β-D-glucopyranosyl]-(25S)-5β-furostane-3β,22α,26-triol 1 and 3-O-[{α-L-rhamnopyranosyl-(1→4)}{β-D-glucopyranosyl}]-26-O-[β-D-glucopyranosyl]-22α-methoxy-(25S)-5β-furostane-3β,26-diol 2 on the basis of spectroscopic techniques and chemical methods.

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A New Pregnane Glycoside from Fermented Leaves of Agave americana

Jian Ming JIN, Xi Kui LIU, Chong Ren YANG

中国化学快报. 2002, 13(12): 1189-1192.

摘要 ( )

可视化

A new minor pregnane glycoside was isolated from the fermented leaves of Agave americana. Its structure was elucidated as (20S)-5α-pregnane-3β, 20-diol 20-O-β-D-glucopyranoside (1) by spectral methods.

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The Optical Resolution of Chiral Tetrahedrone-type Clusters Containing SCoFeM (M=Mo or W) Using High Performance Liquid Chromatography Chiral Stationary Phase

Xiao Qian HAN, Yong Min LI, Yu Hua ZHANG, Sheng Xiang JIANG, Li Ren CHEN

中国化学快报. 2002, 13(12): 1193-1194.

摘要 ( )

可视化

Amylose tris (phenylcarbamate) chiral stationary phase (ATPC-CSP) was prepared and used for optical resolution of clusters 1 and 2. n-Hexane/2-propanol (99/1;v/v) were found to be the most suitable mobile phase on ATPC-CSP

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Determination of Utratrace Silver Using Surfactant As Sensitizer by Catalytic Near Field Laser Thermal Lens Spectrometry

Quan HAN, Hong Tao YAN, Zhen Jie QIAN

中国化学快报. 2002, 13(12): 1195-1198.

摘要 ( )

可视化

A new method for the determination of utratrace silver(I) by near field thermal lens spectrometry has been developed. This method is based on the silver(I) catalyzed discoloring reaction of bromocresol green oxidized by sodium persulphate in the presence of α, α'-bipy as activator and Triton X-100 as sensitizer. The linear range of this method is 0~1.6 ng·mL^-1 of silver. The detection limit is 2×10^-2 ng·mL^-1. The method has been applied to the determination of silver in lead power and photographic paper with satisfactory results.

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A New HPLC Method to Determine Carbonyl Compounds in Air

Qing Tao PENG, Wen Xiang HU, Xue Jun HOU

中国化学快报. 2002, 13(12): 1199-1202.

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可视化

In this paper, a new HPLC method was established to determine the carbonyl compounds in air. As the absorbent, 2, 4-dinitrophenylhydrazine (2, 4-DNPH) reacted with carbonyls specifically, which form the corresponding 2,4-dinitrophenylhydrazones, then analyzed by HPLC. The chromatographic conditions, the recovery rate, stability of samples, reagent blank,sampling efficiency were all studied systematically. The results showed that this established method had high sensitivity and good selectivity compared with other analytical methods, and it can determine ten carbonyl compounds in air in 26 min simultaneously.

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Effect of Micelle Composition on Acidic Drugs Separation Behavior by Micellar Electrokinetic Capillary Chromatography

Miao WANG, Jian Wei YAN, Yan Fei LIN, Jian De LU, Xiao Yun FU

中国化学快报. 2002, 13(12): 1203-1204.

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可视化

Micellar electrokinetic capillary chromatography (MECC) separation of four acidic drugs similar in structure was studied. Both anionic surfactant sodium dodecyl sulfate (SDS) and nonionic surfactant Tween 20 were used to form single micelles and mixed micelles as pseudostationary phases. The effects of the composition of micellar solution on retention behaviors were studied. The results indicate that there is markedly different selectivity among SDS, Tween 20 and the mixed micelles systems.

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TDDFT Studies of Electronic Structure and First Hyperpolarizability of Tetra-nuclear Cubane-like Transition Metal Clusters

Rong Jian SA, Ke Chen WU, Ping LIU, Chen Sheng LIN, Chao Yong MANG

中国化学快报. 2002, 13(12): 1205-1208.

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可视化

The TDDFT method is first applied in a series of tetra-nuclear transition metal clusters studies for nonlinear optical properties. The results indicate that the charge transfer inside the metal core[MCu₃X₄] (M=W, Mo; X=S, O, Cl, Se, Br) makes contribution to the optical nonlinearity. It is possible to enhance the hyperpolarizability by substituting the ligands of the clusters.

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New Ruthenium Complexes of Fullerene C₆₀ & C₇₀

Da Dian CHENG, Zhen Rong DONG, Zhen Yi WU, Yong Sheng LIN, Sen Gen YANG, Meng Xiong ZHAN

中国化学快报. 2002, 13(12): 1209-1212.

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可视化

The new complexes[Ru(NO)(PPh₃)]₂(η²-C_m) (m=60 1 or 70 2) have been prepared by heating a solution of C₆₀(or C₇₀) with[Ru(NO)₂(PPh₃)₂] in toluene. They have been characterized by elemental analysis, IR, UV/VIS, XPS, ¹³C and ³¹P NMR spectroscopy. The photovaltaic effect for the new compounds has been studied.

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Biocatalytic Synthesis of Pyruvate from DL-lactate with Enzymes in Pseudomonas sp.

Jing Song GU, Ping XU, Yin Bo QU

中国化学快报. 2002, 13(12): 1213-1216.

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可视化

A novel method of preparing pyruvate from DL-lactate catalyzed by enzymes from a bacterial strain of Pseudomonas sp. SM-6 was proposed. Catalytic processes of cell-free extract enzymes and immobilized enzymes were evaluated. The kinetic data were studied, too.

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New Rh-ZnO/Carbon Nanotubes Catalyst for Methanol Synthesis

Jin WANG, Hong Bo CHEN, Hong HE, Yun CAI, Jing Dong LIN, Jun YI, Hong Bin ZHANG, Dai Wei LIAO

中国化学快报. 2002, 13(12): 1217-1220.

摘要 ( )

可视化

A new catalyst for methanol synthesis, ZnO-promoted rhodium supported on carbon nanotubes, was developed. It was found that the Rh-ZnO/CNTs catalyst had high activity of 411.4 mg CH₃OH/g/cat/h and selectivity of 96.7% for methanol at 1 MPa and 523 K. The activity of this catalyst is much higher than that of NC 207 catalyst at the same reaction conditions.It was suggested that the multi-walled structure CNTs favored both the couple transfer of the proton and electron over the surface of the catalyst and the uptake of hydrogen which was favorable to methanol synthesis.

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A Novel Ultrafine Ru-B Amorphous Alloy Catalyst for Glucose Hydrogenation to Sorbitol

Hong Shan LUO, Hai Bing GUO, He Xing LI, Ming Hui WANG, Ye Ping XU

中国化学快报. 2002, 13(12): 1221-1224.

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可视化

An ultrafine Ru-B amorphous alloy catalyst was prepared by chemical reduction with KBH₄ in aqueous solution, which exhibited perfect selectivity to sorbitol (~100%) and very high activity during the liquid phase glucose hydrogenation, much higher than the corresponding crystallized Ru-B, the pure Ru powder, and Raney Ni catalysts. The correlation of the catalytic activity to both the structural and surface electronic characteristics was discussed briefly.

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A Novel Method to Synthesize Polyorganozircosilazane

Chun Juan LIU, Li Hua LIU, Shi Yan YANG, Wei GAO, Ze Min XIE

中国化学快报. 2002, 13(12): 1225-1226.

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可视化

A new kind of polyorganozircosilazane as Si/Zr/C/N-based ceramic precursor was synthesized from the condensation reaction of hexamethylcyclotrisilazane lithium salts (D₃^NLi) and zirconium tetrachloride (ZrCl₄). In the presence of N, N, N', N'-tetramethyl ethylene diamine (TMEDA), polyorganozircosilazane was obtained in high yield.

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Theoretical Investigation for the Abstraction Reaction of H with (CH₃)₃GeH

Qing Zhu ZHANG, Chun Sheng WANG, Yue Shu GU

中国化学快报. 2002, 13(12): 1227-1230.

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可视化

The abstraction reaction of H atom with (CH₃)₃GeH has been studied using ab initio molecular orbital theory. The kinetics calculation has been deduced using the canonical variational transition state theory (CVT) with the small-curvature tunneling correction method (SCT) over the temperature range of 200-3000 K. The CVT/SCT rate constants exhibit typical non-Arrhenius behavior, and a three-parameter rate-temperature formula has been fitted as follows:k=6.66×10^- ¹⁸T^2.33 exp(-60.3/T) (in units of cm³ molecule^-1 s^-1).

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Evaluation of Transient Absorption Spectra of N, N, N', N'-Tetra-(p-methylphenyl)-4, 4'-diamino-1, 1'-diphenyl Ether (TPDAE) for Electron Transfer from TPDAE to Fullerenes (C₆₀/C₇₀) by Laser Flash Photolysis

He Ping ZENG

中国化学快报. 2002, 13(12): 1231-1234.

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可视化

Photoinduced electron transfer processes between fullerenes (C₆₀/C₇₀) and N, N, N', N'-tetra-(p-methylphenyl)-4, 4'-diamino-1, 1'-diphenyl ether (TPDAE) have been studied by nanosecond laser flash photolysis. Quantum yields and rate constants of electron transfer from TPDAE to excited triplet state of fullerenes (C₆₀/C₇₀) in benzonitrile have been evaluated by observing the transient absorption bands in the near-IR region where the excited triplet state,radical anion of fullerenes (C₆₀/C₇₀) and radical cations of TPDAE appear.

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2002年, 第13卷, 第12期　刊出日期：2002-12-20

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2002年, 第13卷, 第12期 刊出日期：2002-12-20

2002年, 第13卷, 第12期　刊出日期：2002-12-20