中国化学快报

Select

The Synthesis of 1-Aryl-5-Fluorouracil

Jin Zong YOU, Shao Yuan CHEN, Omar ISHRUD, Yan Guang WANG, Yao Zu CHEN

中国化学快报. 2000, 11(10): 65-866.

摘要 ( )

可视化

A series of new type substituted S-fluorouracil derivatives, 1-aryl-5-fluorouracil (4a-4f), were synthesized via diarvliodonium salts and the structure of the title compound was finally confirmed by IR, UV, ¹H-NMR, MS and CHN analysis.

Select

The Novel Selective Reduction of the C-C Triple Bond

Wen Xin GU, An Xin WU, Xin Fu PAN

中国化学快报. 2000, 11(10): 847-848.

摘要 ( )

可视化

A novel reduction system is reported here in which the compounds with terminal C-C triple bond and disubstituted C-C triple bond react with NaBH₄/Pd(PPh₃)₄, in a base condition and only terminal C-C triple bond is reduced.

Select

Oxidative Rearrangement via Oxycerication with Ce(IV) Salt

Bo WANG, Hong Zhu MA

中国化学快报. 2000, 11(10): 849-850.

摘要 ( )

可视化

A mild and reliable procedure for the preparation of α-arylpropanoic acids from arylpropanone by Ce(IV) salt oxidative rearrangement is discribed.

Select

A Solid Phase Synthesis of Chalcones by Claisen-Schmidt Condensations

Mao Sheng CHENG, Rong Shi LI, George KENYON

中国化学快报. 2000, 11(10): 851-854.

摘要 ( )

可视化

In order to accelerate the development of relatively inexpensive antimalarials that are effective against chloroqtrine-resistant strains of Plasmodium falclparum, a methodology for the solid phase synthesis of chalcone (1 3-diphenyl-2-propen-1-one) analogues in reasonably high yields has been developed.

Select

A New Approach for Preparation of Various Phenylethylamines

Chong Zhao RAN, Tai Zhi WU, Yong XIANG, Mei Hua XIE

中国化学快报. 2000, 11(10): 855-856.

摘要 ( )

可视化

A new approach for preparation of various substituted phenylethylamines from the corresponding nitro compounds with iron powder and NH₄Cl in 75% aqueous ethanol solution was developed.

Select

A New Approach to Prepare 2-Acetyl-Mono(5,6,7,8)-Nitro-l,2,3,4-Tetrahydroisoquinolincs

Chong Zhao RAN, Tat Zhi WU, Guo Ping WANG, Met Hua XIE

中国化学快报. 2000, 11(10): 857-860.

摘要 ( )

可视化

N-Acetyl-p, m or o-nitro-phenylethylamines and (HCHO)_n were treated in 60% H₂SO₄/HOAc, via α-amidoalkylation to give 2-acetyl-mono(5, 6, 7 or 8)-nitro-1,2,3,4-tetrahydroisoquinolines. Additionally, some interesting phenomena were observed when the comparison between 2-acetyl-5, 6, 7 or 8-nitro-1,2,3,4-tetrahydroisoquinolines and 2-alkylsulfonyl-5,6 or 7-vitro-1,2,3,4-tetrahydroisoquinolines was made.

Select

Synthesis and Spectrophotometric Studies of 2-(5-Carboxy-1,3,4-triazolylazo)-5-diethylamino Aniline

Fu You PAN, Chang Hua GE, Hua Ding LIANG

中国化学快报. 2000, 11(10): 861-862.

摘要 ( )

可视化

In this paper, 2-(5-carboxy-1,3,4-triazolylazo)-5-diethylamino aniline(CTZAN) was prepared, the protonation behaviour of this reagent is reported. Its structure was identitied.

Select

A Facile Method to Synthesize Spiro-calix[4]arenes

Qi Yu ZHENG, Chuan Feng CHEN, Zhi Tang HUANG

中国化学快报. 2000, 11(10): 863-864.

摘要 ( )

可视化

The sniro-calix[4]larenes 3a-b can be synthesized conveniently by the reaction of p-tert-butylcalix[4]arene (la) or calix[4]arene (1b) with pentaerythritol tetrakis(2-chloroacetate) (2).

Select

A Convenient Method for the Synthesis of 1,3,2-Oxazaphospholidin-[3,2-a]-8-oxo-10-thio(or seleno)-[1,3,2]-benzodiazaphosphorines

Sheng Lou DENG, Jun Min HUANG, Ru Yu CHEN

中国化学快报. 2000, 11(10): 867-870.

摘要 ( )

可视化

A Convenient method for the synthesis of fused phosphorusheterocycle 1,3,2-oxazaphosphorin-[3,2-a]-8-oxo-l0-thio(or seleno)-[1,3,2]-benzodiazaphosphorines was carried out in one pot by the reaction of Tris(diethylamino)phosphine with multifunctional compounds 2-(N-(β or y-hydroxyl) alkylene) amino-benzamides 1. When PCL₃, was used, only chlorinated product was obtained.

Select

Studies on the Total Synthesis of Crotocembreneic Acid and Neocrotocembreneic Acid:A Perchloric Acid-induced Lactonization Reaction of Epoxy Ester

Zuo Sheng LIU, Jiong LAN, Li Zeng PENG, Yu Lin LI

中国化学快报. 2000, 11(10): 871-872.

摘要 ( )

可视化

A perchoric acid-induced lactonization reaction of epoxy ester is described. Using lithium perchlorate, the ketone is obtained in 81% yield.

Select

Studies on Agarofurans VI. The Introduction of Substituents to C-1 and C-2 Positions of Agarofurans

Wu Yan ZHANG, Ji Yu GUO, Xiao Tian LIANG

中国化学快报. 2000, 11(10): 873-874.

摘要 ( )

可视化

Agarofuranoids with oxygen functions at C-1 and C-2 were synthesized by allylic oxidation. Ketone 2 gave compound 8 and 9 by Grignard reaction. The configuration of C-2 in 8 and 9 were identified by the CD spectroscopy of the benzoate 10.

Select

First Total Synthesis of Four Benzodioxane Neolignans

Xiao Bi JING, Wen Xin GU, Ping Yan BIE, Xin Feng REN, Xin Fu PAN

中国化学快报. 2000, 11(10): 875-878.

摘要 ( )

可视化

Four 1,4-benzodioxane neolignans were first synthesized from pyrogallol, in which the Claisen rearrangement was used to afford three important C₆-C₃ units.

Select

Synthesis of 2,6-Dimethoxyhydroquinone-3-mercaptoacetyl-peptide-chlorambucil Conjugates

Yu Fei SONG

中国化学快报. 2000, 11(10): 879-882.

摘要 ( )

可视化

This paper reports a continous study of the use of short chain peptides as carriers of a potential antitumor agents:2,6-dimethoxyhydroquinone-3-mercaptoacetic acid (DMQ-MA). In an effort to carry out anti-cancer drug design, we synthesized another two new DMQ-MA-peptide-chlorambucil (CRB) derivatives:DMQ-MA-Lys(CRB)-Arg-OMe, DMQ-MA-Lys(DMQ-MA)-Lys(CRB)-Arg-OMe. These peptide-chlorambucil conjugates were synthesized by coupling protected amino acids in solution and the next conjugation was achieved by reacting with pentafluorophenyl ester of DMQ-MA in DMF. The CRB in side chain was coupled by deblocking the lysyl-carbobenzyloxy protecting group Z and then reacting with the pentafluorophenyl ester of chlorambucil (CRB). Further study on cytotoxicity, DNA binding, and sequence specificity of DNA alkylation of these two new conjugates are investigating.

Select

Synthesis and Electrochemical Studies on BEDT-TTF Derivatives with Hydroxyl Groups

Hong Xiang LI, De Qing ZHANG, Wei XU, Dao Ben ZHU

中国化学快报. 2000, 11(10): 883-886.

摘要 ( )

可视化

New electron donors with hydroxyl groups were synthesized and characterized spectroscopically. Their redox potentials were determined with cyclic voltammetry, and the comparison with BEDT-TTF [Bis(ethylenedithio)tetrathiafulvalene] in this aspect was made. These results indicated that the new electron donors had similar electron-donating capabilities as BEDT-TTF.

Select

Synthesis and Structure of A Novel Caged Bicyclic Phosphate Flame Retardant

Xin LI, Yu Xiang OU, Yun Hong ZHANG, Dan Jun LIAN

中国化学快报. 2000, 11(10): 887-890.

摘要 ( )

可视化

A novel caged bicyclic phosphate flame retardant tri(1-oxo-2,6,7-trioxa-I-phosphabicyclo [2.2.2] octane-methyl) phosphate (Trimer) was synthesized from 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicvclo [2.2.2] octane (PEPAI and phosphorus oxychloride in this paper. Its structure was characterized by elemental analysis, FTIR. ¹H NMR, ¹P NMR and X-ray diffraction analysis.

Select

Theoretical Study of the Thermal Decomposition of Chlorofluoromethanol (CHCIFOH)

Shao Kun WANG, Hua HOU, Qing Zhu ZHANG, Chun Yan KONG, Bao Shan WANG, Yue Shu Gu

中国化学快报. 2000, 11(10): 891-892.

摘要 ( )

可视化

A complete potential energy surface for the CHCIFOH system was calculated at the G3(MP2) level. The calculations reveal that the four-center 1.2-HX (X=F. CI) elimination mechanism rather than the bond scission mechanism dominate decomposition of CHCIFOH. The results are valuable to understand the atmospheric chemistry of HCFC-31.

Select

Development of Multi-Wavelength Spectral-Correction Method

Hong Wen GAO

中国化学快报. 2000, 11(10): 893-894.

摘要 ( )

可视化

This investigation developed a new method for determining metal complex's property containing the stepwise real absorptivity (ε) and stability constant (K_m). The correction equation of the multi-wavelength spectral absorption was established for the simultaneous determination of various complexes to give high accuracy for trace analysis. This method was more acceptable in theory and simpler in operation than the classical methods.

Select

A New Flavonoid Ketohexofuranoside from Leaves of Crataegus pinnatifida Bge.var. major N.E.Br.

Pei Cheng ZHANG, Sui Xu XU

中国化学快报. 2000, 11(10): 895-896.

摘要 ( )

可视化

A new tlavonoid, namely pinnatifine I (1), was isolated from the leaves of Crataegus pinnatifida Bge, var. major N.E.Br.. Its structure was elucidated by spectroscopic analysis and chemical evidence.

Select

Two New Glycosides from Rubus amabilis

Xiao Chuan CHEN, Zhong Jian JIA

中国化学快报. 2000, 11(10): 897-990.

摘要 ( )

可视化

A pregnane glycoside and a lignan glycoside were isolated from the aerial parts of Rubes amabilis. Their structures were elucidated as 3-O-β-D-glucopyranosyl-3β.15α-dihydroxypregn-5-en-20-one and(-)-secoisolariciresinol-O-α-L-rhamnopyranoside using spectroscopic and chemical methods.

Select

Two New Steroidal Glycosides from Ophiopogon japonicus

Hao Fu DAI, Jun ZHOU, Zhong Tao DING, Jiang XIONG, Ning Hua TAN

中国化学快报. 2000, 11(10): 901-904.

摘要 ( )

可视化

Two new C₂₇, steroidal glycosides, named ophiopojaponin A (1)and B (2), were isolated from the tubers of famous traditional Chinese herb-Ophiopogon japonicus. The spectroscopic and chemical evidences revealed their structures to be Pennogenin 3-O-[2'-O-acetyl-α-L-rhamnopyranosyl (1→2)]-B-D-xylopyranosyl(1→3)-[3-D-glucopyranoside (1) and 26-O-β-D-glucopyranosyl-(22ξ, 25R)-3β, 14α, 22ξ, 26-tetrahydroxyfurost-5-ene 3-O-α-L-rhamnopyranosyl (1→2)-(β-D-glucopyranoside (2), respectively.

Select

Sesquiterpene Lactones from Notoscris Porphyrolepis

Feng Lan XU, Jun TIAN, Meng Long LI, Li Sheng DING, Feng E WU

中国化学快报. 2000, 11(10): 905-908.

摘要 ( )

可视化

Two new sesquiterpene lactones, notoserolides A and B, along with 12 known compounds were isolated from the aerial parts of Notoseris porphyrolepis. By means of spectral methods including MS, NMR (¹H NMR. ¹³C NMR, DFPT, HMQC. HMBC) and X-ray diffraction. as well as chemical reactions. the structures of notoserolides A and Q were established as austricin 8-O-β-D-glucopyranoside and 8-O-senecioylaustricin, respectively.

Select

Ginsenoside-Rg₆, a Novel Triterpenoid Saponin from the Stem-Leaves of Panax ginseng C. A. Mey.

Xiu Wei YANG, Long Yun LI, Jian Ming TIAN, Zhi Wei ZHANG, Jin Mei YE, Wei Fang Gu

中国化学快报. 2000, 11(10): 909-912.

摘要 ( )

可视化

A novel dammarane-type triterpene oligoglycoside, named ginsenoside-Rg₆, 3, was isolated from the stem-leaves of Panax ginseng C. A. Mey., together with two known ones. 20(S)-ginsenoside-Rg₂ 1 and 20(R)-ginsenoside-Rg₂ 2. On the basis of chemical and physicochemical evidence. the structure of ginsenoside-Rg₆ have been elucidated as 6-O-α-L-rhamnosyl-(1→2)-β-D-glucopyranosyl-dammarane-(E)-20(22), 24-diene-3β. 6α, 12β-triol.

Select

A New Triterpenoid Saponin from Aralia subcapitata

Min Liang ZOU, Sheng Min SANG, Zeng Hua XIA, Ai Na LAO

中国化学快报. 2000, 11(10): 913-914.

摘要 ( )

可视化

A new oleanane-type saponin. named subcapitatoside A. has been isolated from the rtrdts of Aralia subcapitata. On the basis of chemical and spectral evidence. the structure of subcanitatoside A has been established as:3-O-β-D-galactopyranosyl-(1→2)-(3-D-galacto-pyranosyl oleanolic acid.

Select

Impedance Characterization of the Film Formation Process at the Graphite Anodes

Bo Hua DENG, Yong Fang LI, Hua Quan YANG

中国化学快报. 2000, 11(10): 915-918.

摘要 ( )

可视化

In this paper, the formation mechanism of the passive SFI film at the natural graphite anodes was investigated with the electrochemical impedance spectroscopy (EIS). A characteristic semicircle was observed in the lower frequency range of the EIS spectrum for the irreversible charge process (lithium intercalation) at ca. 0.75V, 0.40V and 0.20V.

Select

The Electrochemical Investigation of MEH-PPV in Ionic Liquid

Chun He YANG, Gu Feng He, Jun Rong ZHENG, Jing QIAO, Yong Fang LI

中国化学快报. 2000, 11(10): 919-920.

摘要 ( )

可视化

Abstract The electrochemical properties of MEH-PPV were studied in ionic liquid([bmim]⁺[PF₆]^-) by cyclic voltammetry, chronoamperometry and AC impedance measurements. Both p-and n-doping of MEH-PPV were observed in the cyclic voltammograms. The chronoamperometric and AC impedance results indicate that the p-doping of MEH-PPV was controlled by the linear diffusion of counterions.

Select

The LB Films of Dansyl Chloride Labeled Octadecylamine and Its Fluorescence Lifetime

Hai Ning CUI, Guo Liang YUAN, Wei LI, Wen Yun WANG, Shi Quan XI

中国化学快报. 2000, 11(10): 921-924.

摘要 ( )

可视化

Octadecylamine was derivatized with dansyl chloride (5-dimethylaminonaphthalene-l-sulfonyl chloride) in order to simplify and understand the LB films of fluorescent probe labeling proteins. Its monolayer and multilayers in the absence and presence of stearic acid were deposited by LB technique. Fluorescence spectra and lifetimes of the fluorescent products were studied to elucidate the microenvironment of molecules in the LB films.

Select

Relaxation of Chain Extension of Amorphous PET Fiber Above the Glass Transition Temperature

Xin LINGHU, Jun ZHAO, Rui SONG, Qing Rong FAN

中国化学快报. 2000, 11(10): 925-928.

摘要 ( )

可视化

The recovery of amorphous PET fiber in global chain orientation but nearly random segmental orientation (GOLR) state was studied by the hot shrinkage measurement above the glass transition temperature. The relaxation curves in the form of di-exponential decay were acquired and the change of two special times with the variation of treating temperature and residual recovery ratio η was discussed.

Select

Different Aggregation Behaviors of Tetra-(4-hydroxyphenyl) Porphyrin (THPPH₂) in the Inner Core and on the Surface of CTAB Micelles

Chen MA, Yun Hong ZHANG, Chang Song FU, Qian Shu LI

中国化学快报. 2000, 11(10): 929-930.

摘要 ( )

可视化

The UV-Vis spectra of THPPH₂ in CTAB micelles at pH7.2 and pH11.0 were analyzed to study the effect of micellar environments on the aggregation behaviors of this porphyrin.

Select

Crystal Form Transition during Heating of Solvent-induced Crystalline Syndiotactic Polystyrene

Cheng Shen ZHU, Hong Jing DOU, Su Qin HE, Zhi Shen MO

中国化学快报. 2000, 11(10): 931-932.

摘要 ( )

可视化

The phase transition of two kinds of solvent-induced crystalline syndiotactic polystyrene (sPS), γ -sPS and δ_e-sPS, has been studied via WAXD and DSC. γ-sPS transform to α-sPS at 195-225℃ before melt during heating, whereas δ_e-sPS transform to first γ-sPS and then α-sPS at 100-200℃ and 200-215℃, respectively. The transition of δe-γ and γ-α occurs far below melting point of sPS indicates they are all solid-solid transition.

Select

Controlling the Molecular Weight and Molecular Weight Distribution using Compressed CO₂ Antisolvent

Jun LIU, Zhi Min LIU, Bu Xing HAN, Jian WANG, Qing HUO, Fang Fang LIU

中国化学快报. 2000, 11(10): 933-934.

摘要 ( )

可视化

Effect of CO₂ dissolved in tetrahydrofuran (THF) on the polymerization of styrene in THF was studied at 333.2 K and different pressures. It was found that the molecular weight (MW) and MW distribution of the polystyrene (PS) could be controlled by pressure.

Select

Synthesis and Structural Characterization of One-dimensional Polynuclear Complex[La(bipyN₂O₂)(TFA)₃]_n

Wen Xiang ZHU, Yun HE

中国化学快报. 2000, 11(10): 935-936.

摘要 ( )

可视化

A novel polymeric complex[La(bipyN₂O₂)(TFA)₃]_n(TFA=trifluoroacetylacetone) was prepared. The X-ray structure analysis revealed that the complex has an infinite one-dimensional supramolecule structure with the 4,4'-bipyridyl-N,N'-dioxide as a bridge. La(Ⅲ) is coordinated to eight oxygen atoms, six from three trifluoroacetylacetonate anions, two from two 4,4'-bipyridyl-N,N'-dioxide molecules.

Select

Easy Fabrication of Dense Ceramic Membrane for Oxygen Separation

Zong Ping SHAO, Guo Xing XIONG, Wei Shen YANG

中国化学快报. 2000, 11(10): 937-940.

摘要 ( )

可视化

A combined EDTA-citrate complexing method was developed for the easy preparation of mixed oxygen-ionic and electronic conducting dense ceramic membrane for oxygen separation The new method takes the advantage-of lower calcination temperature for phase formation, lower membrane sintering temperature and higher relative density over the standard ceramic method.

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2000年, 第11卷, 第10期　刊出日期：2000-10-20

选择文件类型/文献管理软件名称

选择包含的内容

本期目录

2000年, 第11卷, 第10期 刊出日期：2000-10-20

2000年, 第11卷, 第10期　刊出日期：2000-10-20