1992 Volume 3 Issue 4

A NEW SYNTHESIS OF dl-AND (R)-MUSCONE FROM CYCLODODECANONE
Da Sheng WANG , Chang Hai ZHOU , Dao Quan WANG
1992, 3(4): 235-236
[Abstract](168) [FullText HTML] [PDF 68KB](2)
Abstract:
dl-And (R)-muscone were synthesized from the readily available cyclododecanone by a free radical ring expansion in overall yields of 51% and 32% respectively
OPTICALLY ACTIVE AMINO ACIDS WITH HIGHLY BRANCHED SIDE CHAIN (I):SYNTHESIS OF D-AND L-2-AMINO-5,5-DIMETHYLHEXANOIC ACID AND 2-AMINO-6,6-DIMETHYLHEPTANOIC ACID
Zong Xuan SHEN , Jian Fsng QIAN , Wen Jin QIANG , Ya Wen ZHANG
1992, 3(4): 237-238
[Abstract](170) [FullText HTML] [PDF 90KB](2)
Abstract:
The title compounds were prepared by the enzymatic resolution of the corresponding N-acetylated DL-amino acids methyl esters, which were obtained from t-butyl chloride via an 8-step synthesis
SYNTHESIS OF ACYCLIC CROWN ETHERS WITH 1-METHYLIMIDAZOLE-2-THIO END GROUPS
Qing Jian LIU , Ming Li SHI
1992, 3(4): 239-240
[Abstract](167) [FullText HTML] [PDF 57KB](0)
Abstract:
The synthesis of new acyclic crown ethers 1, 2, and 3 with methimazole as terminal group is reported
SYNTHESIS OF 1, 1-DIALKYLTHIO-1, 3, 5-HEXATRIENES WITH α-OXOKETENE DITHIOACETALS
Qun LIU , Bao Zhong ZHAO
1992, 3(4): 241-244
[Abstract](153) [FullText HTML] [PDF 122KB](0)
Abstract:
α-Oxoketene dithioacetals 2 via, 1,2-nucleophilic addition by allyl magnesium bromide afforded corresponding alcohols (3).Treated with water and catalyzed by Lewis acid, the alcohols 3 were converted regiospecifically to the conjugated 1,1-dialkylthio-1,3,5 hexatrienes (4). Both the alcohol 8 and its methoxy methyl ether 9 were sensative to dilute sulfuric acid and cyclized under this condition to form the aryl methylthio ether (10)
AN IMPROVED METHOD TO SYNTHESIZE VITAMIN B12 COENZYME ANALOGUES CONTAINING 2'-DEOXYNUCLEOSIDE
Hui Lan CHEN , Hong YAN , Wen Xia TANG
1992, 3(4): 245-246
[Abstract](156) [FullText HTML] [PDF 87KB](0)
Abstract:
A new vitamin B12 coenzyme analogue 2’,5’-dideoxyuridinyicobalamin and two other 2’,5’-dideoxynucleosidecobalamins of adenosyl-and thymidyl-were synthesized by an improved method, It consists in direct tosylation of the nucleoside and followed by reaction with reduced hydroxocobalamin(vitamin B12). All the 2’-deozynucleoside derivatives were characterized by UV-Vis and 1HNMR spectroscopy
THE SOLID STATE CONTROLLED CONDENSATION REACTION OF FERROCENEALDEHYDE AND INDOLE
Ji Ben MENG , Da Ming DU , Yong Mei WANG , Ru Ji WANG , Hong Gen WANG
1992, 3(4): 247-250
[Abstract](163) [FullText HTML] [PDF 119KB](0)
Abstract:
The ZnCl2-catalyzed condensation reaction of ferrocenealdehyde and indole in the solid state gave a new product (di-3-indolyi)-methylferrocene(3). The crystal structure of product 3 was determined by X-ray diffraction method. Reactions in solution and photochemical reactions were also carried out
THE STUDY OF ENZYMATIC SYNTHESIS OF MACROCYCLIC LACTONES
Jin Wang XU , Zu Yi LI
1992, 3(4): 251-252
[Abstract](158) [FullText HTML] [PDF 91KB](0)
Abstract:
The effects of the chain length and stereo-factor of substrates and solvents on the lipase catalysed lactonization of ω-hydroxy-ester were studied, And also the catalytic effects of various enzymes were compared
STEREOSELCETIVE SYNTHESIS OF SOME NUCLEOSIDES
Xian Yun JIAO , Meng Shen CAI
1992, 3(4): 253-254
[Abstract](160) [FullText HTML] [PDF 89KB](0)
Abstract:
A new method for the synthesis of perbenzylated, peracetylated and perbenzoylated sugar nucleosides has been carefully studied. In this method trichloroacetoxy and trifluoroacetoxy groups were displaced efficiently in the reaction of nucleoside formation as leaving group. And this method was found to be widely applicable in the study of carbohydrate chemistry
STUDIES ON HETERO-MACROCYCLIC POLYETHER (Ⅱ). THE SYNTHESIS OF PLATINUM COMPLEX OF 10-SELENABENZO-15-CROWN-5 AND ITS CATALYTIC BEHAVIOR IN HYDROSILYLATION
Xiu Fang LIU , Wei Ping LI , Li Feng ZHANG , Xue Ran LU , Hart Sheng XU
1992, 3(4): 255-256
[Abstract](173) [FullText HTML] [PDF 55KB](1)
Abstract:
The title complex (PtL2Cl2) was synthesized by reacting 10-selenabenzo-15-crown-5 (L) with potassium chloroplatinite. Its catalytic activity for the hydrosilylation of olefins by triethoxysilane, was investi gated
A NOVEL FREE RADICAL REARRANGEMENT
Shi Zhi CHEN , Ming GUO , Kai Rong CUI , and Liang HUANG
1992, 3(4): 257-258
[Abstract](157) [FullText HTML] [PDF 75KB](0)
Abstract:
The reaction of benzyloxyethanol with carbon tetrabromide was investigated, and a possible mechanism was proposed
A STUDY OF THE REACTIONS OF BENZYL ETHERS WITH DIBROMOCARBENE
Qi Jun LIN , Miao ZHANG
1992, 3(4): 259-262
[Abstract](150) [FullText HTML] [PDF 120KB](0)
Abstract:
Using potassium carbonate as base and a polyethylene glycol with an average molecular weight of 600 (PGE600) as phase transfer catalyst, reaction of benzyl ethers with dibromocarbene leads to benzylic C-H bond insertion products, aromatic aldehydes are also formed as one of the products
EFFECT OF ELECTRON DONORS ON THE SELECTIVE HYDROGENATION OF DIENE TO MONOENE OVER HETEROGENIZED Pd CATALYST
Tong Shen ZHANC , Yun XU , Shi jian LIAO
1992, 3(4): 263-264
[Abstract](160) [FullText HTML] [PDF 85KB](0)
Abstract:
In the selective hydrogenation of diene (or alkyne) using heterogenized homogeneous catalyst, the high selectivity of monoene formation only appears in a very short time interval. The addition of suitable electron donors can decrease or even cease the monoene hydrogenation and thereby keep the high monoene selectivity after reaching its maximum
ELECTROCARBOXYLATION OF ORGANIC COMPOUNDS WITH CARBON DIOXIDE CATALYZED BY METALLOPORPHYRINS(Ⅱ)--ELECTROSYNTHESIS OF SOME ORGANIC COMPOUNDS WITH CO2 CATALYZED BY CoTPP
Guo Dong ZHENG , Qing Da AN , Yu Wen LIU , Ying Jun WANG , Xi Zhang CAO
1992, 3(4): 265-266
[Abstract](162) [FullText HTML] [PDF 92KB](0)
Abstract:
The catalyzation of CoTPP for electrocarboxylation of alkyl halides, alkenes and ketones with CO2 are studied. The electrocarboxylation of these organic compounds with CO2 in the presenec of catalyst can occur at more positive potential than that of no catalyst. The products of electrocarboxylation were identified by UV, IR and GC-MS. The electrocarboxylation mechanisms of different organic compounds are discussed
OXIDATION OF ALKYLBENZENE CATALYZED BY RUTHENIUM-POLYMERBOUND 2,2’-BIPYRIDINE COMPLEXES
Zi Qiang LEI , Yun Pu WANG
1992, 3(4): 267-268
[Abstract](157) [FullText HTML] [PDF 88KB](0)
Abstract:
Oxidation of ethylbenzene, n-propylbcnzene and n-butylbenzene gives the corresponding ketones and alcohols in good yields by organic polymer supported low-valent Ru (Ⅱ) complexes under 1 atm. of air or oxygen at 100℃ in the absence of solvent. The calalytic selectivity to total ketone and alcohol ranged from 98.7% to 100%. The polymer complex polymer-bipy-Ru-bipy (bipy=2, 2’-bipyridine) is very stable and can be reused for 5 times (each for 5h) without appreciable change in catalytic activity
CHEMISTRY OF DENUDATINE Ⅲ. REARRANGEMENT OF DENUDATINE
Feng Peng WANG , Jian Zhong WANG , Rong ZHANG
1992, 3(4): 269-270
[Abstract](155) [FullText HTML] [PDF 75KB](1)
Abstract:
Treatment of denudatine 1 with 10% HCl soln. at 30-40℃ for 1 day leads to another rearrangement product 3 along with a pair of epimers 2A and 2B. Upon adding a little EtOH in the reaction solution, only a pair of epimers 4A and 4B were obtained along with the unchanged starting material
CONFORMATIONAL ANALYSIS ON ANTICHOLINERGIC DRUG (Ⅰ) MOLECULAR MECHANICS MMPM CALCULATION OF ATROPINE AND OTHER ALKALOIDS IN THE BELLADONNA PLANT
Wen Xiang HU , Liu Hong YUN , Shu Sen LI
1992, 3(4): 271-274
[Abstract](159) [FullText HTML] [PDF 169KB](0)
Abstract:
Alkaloids of balladonna plant were studied by molecular mechanics MMPM calculation. The results showed that the ideal conformation was quite different from the structure found in the crystals of the alkaloids in belladonna plant. The intramolecular hydrogen bond was present between the hydroxy group and carbonyl oxygen atom in the ideal conformation for these alkaloids. The origin of asymmetrical molecules in nature obeys the lowest energy principle. This may be a reason why only S-(-) not R-(+)-isomer, only hyoscyamine not pseudotropine were found to be present in natural belladonna plant, The model of four recognition sites between anticholinergic drug-receptor interaction in mydriasis was suggested, in which the hydroxy group with 8~9 A distanced from nitrogen atom is possibly necessary for maximum mydriasis activity
EMPIRICAL RULES FOR 31p-NMR OF ORGANOPHOSPHORUS COMPOUNDS
Wen Xiang HU , Shu Sen LI , Cheng Ye YUAN
1992, 3(4): 275-278
[Abstract](159) [FullText HTML] [PDF 137KB](0)
Abstract:
The substituent effects on 31P-NMR chemical shifts, are determined by five empirical rules. The proposed rules are based on that the shielding (upfield shift) of resonance nucleus is governed by the spherical symmetry of the electron cloud
LOW-VALENT TITANIUM INDUCED REDUCTIVE COUPLING REACTION OF AROMATIC α-HYDROXY KETONES
Zi Jie HOU , Li dun LIU , Yu Lin LI
1992, 3(4): 279-280
[Abstract](161) [FullText HTML] [PDF 74KB](0)
Abstract:
Treatment of aromatic α-hydroxy ketones with an activated Ti(O) reagent, prepared by reduction of TiCl3 with a Zn-Cu couple, effects an intermolecular coupling reaction leading to the (Z)-1, 2, 3, 4-tetrarvl-2-butene and (E, E)-1, 2, 3, 4,-tetraryl-1, 3-butadiene. A possible reaction mechanism was proposed
TRITERPENES AND OTHER CONSTITUENTS FROM CYNOMORIUM SONGARICUM
Chao Mei MA , Shi Shan JIA , Yi Wen ZHANG , Tao SUN
1992, 3(4): 281-282
[Abstract](159) [FullText HTML] [PDF 94KB](0)
Abstract:
From the whole plant of Cynomorium songaricum a new triterpene was isolated together with acetyl ursolic acid, ursolic acid, β-sitosterol palmitate, β-sitosterol, palmitic acid and β-sitosterol glucoside. The structure of the new compound was elucidated as ursa-12-ene-28-oic acid, 3β-propanedioic acid monoester (cynoterpene, 1)
C14 ACETYLENES FROM ARTEMISIA FEDDEI1
Ren Xiang TAN , Zhong Jian JIA , Yu ZHAO , Shi Lan FENG
1992, 3(4): 283-284
[Abstract](146) [FullText HTML] [PDF 72KB](0)
Abstract:
The phytochcmical investigation of the aerial parts of Artemisia feddei Levl. et Vant. gave a pair of novel C14 acetylenic spiroketals
TWO NEW STEROIDAI, SAPDNINS FROM THE BULBS OF ALLIUM MACROSTEMON BUNGE
Jun Peng PENG , Yan WU , Xin Sheng YAO , Toru OKUYAMA , Takao NARUI
1992, 3(4): 285-286
[Abstract](164) [FullText HTML] [PDF 67KB](0)
Abstract:
Two new steroidal saponins, named macrostemonoside A and D. were isolated from the bhlbus of Allium macrostemon Bunge (Liliaceae), and their strurtures were established by spectroscopic analysis and chemical evidences
STUDY ON THE CHEMICAL CONSTITUENTS OF BIDENS BIPINNATA A NEW POLYACETYLENE GLYCOSIDE
Jian Ping WAN , Hisashi ISHII , Takashi HARAYAMA , Yu Min GAO , Qiu Sha HUI , Hui Yun ZHANG , Jiang Xin CHEN
1992, 3(4): 287-288
[Abstract](164) [FullText HTML] [PDF 89KB](2)
Abstract:
A new naturally occurring compound 1-polyacetylene glycoside has been isolated form the n-butanol soluble fraction of the leaves of Bidens bipinnata. The chemical structure of 1 was shown to be 3E, 11E-Diethenylene 5. 7. 9-triacetylene, 1, 13-tridecanglycol-2-O-β-D-glycoside named bipinnatpolyacetyloside according to spectral analyses of UV. IR. FDMS, 1H-NMR, H-H COSY, 13C-NMR and DEPT
A NEW TRITERPENE SAPONIN FROM THE ROOT OF ARALIA SPINIFOLIA
shi shan YU , De Quan YU , Xiao Tian LIANG
1992, 3(4): 289-290
[Abstract](165) [FullText HTML] [PDF 90KB](0)
Abstract:
A new triterpene saponin; 3-0-{β-D-xylopyranosyl(1-2) [β-D-glucuronopyranosyl(1-3)]}β-D-glucopyranosyl-oleanolic acid (Ⅲ) along with two known triterpene saponins has been isolated from the root of Aralia spinifolia. Their structures have been elucidated by spectral analysis and chemical methods
STUDY ON STRUCTURE AND BOND CHARACTER OF SAMARIUM COMPLEX WITH β-ALANINE
Qing Bo HENG , Jian Xue , LIU Chun Ji NIU , Jia Zuan NI
1992, 3(4): 291-292
[Abstract](150) [FullText HTML] [PDF 70KB](0)
Abstract:
The structure and properties of Sm complex with β-alanine have been studied by quantum chemical calculation, The theoretical result agree well with the experimental ones obtained in studies on rare earth complexes with amino acids
LANTHANIDE COMPLEXES OF ACETYLACETONATE-MESO-5-(4-HYDROXY)-10,15,20-TRI-METHOXYPHENYI PORPHYRIN
Guo Fa LIU , Xi Zhang CAO
1992, 3(4): 293-294
[Abstract](164) [FullText HTML] [PDF 72KB](0)
Abstract:
Lanthanide complexes of acetylacetonate-meso-5-(4-hydroxy)-10,15,20,trimethoxyphenylporphyrin, Ln(HMpp)acac (Ln=Dy, Er, H=hydroxy group, M=methoxy group, hacac=acetylacetone, pp=phenylporphyrin) have been prepared and characterized on the basis of elemental analyses, infrared spectra, and ultra-violet visible spectra
NMR AND INFRARED SPECTROSCOPIC STUDY ON THE INTERACTION OF RARE EARTH WITH L-METHIONIHE
Chun Ji NIU , Feng GAO , Qing Bo MENG , Jia Zuan NI
1992, 3(4): 295-298
[Abstract](156) [FullText HTML] [PDF 95KB](0)
Abstract:
Five solid complexes of rare earth with L-methionine have been prepared. The interaction of rare earth with the ligand has been studied by NMR and IR spectroscopy
SPECTROFLUORIMETRIC DETERMINATION OF GERMANIUM WITH MORIN IN WATER AND HEALTH DRINK
Yan Jun CHEN , Guo Qiang SHANGGUAN , Ning WANG , Ya Min CHEN , Hong Wei WANG , Shu Gong ZHANG
1992, 3(4): 299-300
[Abstract](172) [FullText HTML] [PDF 75KB](1)
Abstract:
A highly sensitive and fairly selective spectrofluorimetric method has been developed for the determination of germanium with morin in tap water and health drink. The fluorescent reaction and optimal conditions of germanium with morin in phosphoric acid medium were studied. The detection limits of germanium in tap water and health drink were found to be 0.2 and 0.7μd/L respectively
STUDY ON TRANSPORT AND SEPARATION OF MO(Ⅵ) ION BY USING ELM OF TOA-SPAN 80-OXYLENE
Ke An LI , Quan Min LI , Chang Ying ZOU , Shen Yang TONG
1992, 3(4): 301-302
[Abstract](126) [FullText HTML] [PDF 85KB](0)
Abstract:
A new ELM was prepared for the study on transport of Mo(Ⅵ) ion. Under the experimental conditions, Mo(Ⅵ) can be transported completely and separated from the co-lons.The emulsion liquid membrane(ELM) with Tri-n-octylamine(TOA) as a carrie[1-3] used for the transport of Mo(Ⅵ) ions and its separation from some cations have been reported in this paper. The transport percentage of Mo(Ⅵ) ion through ELM in 5 min corresponds to that of the literature[3] in 165 min
IN SITU X-RAY DIFFRACTION CHARACTERIZATION OF SILVER/SOLUTION INTERFACES
Chang Guo CHEN , Ji Hong YI , Zong Qing HUANG
1992, 3(4): 303-304
[Abstract](158) [FullText HTML] [PDF 83KB](0)
Abstract:
In situ x-ray diffraction electrochemical method is used to study the activation of silver electrode in KCl solution and UPD lead on silver electrode surface. We found that the activation makes the silver crystal thicker in (111), and the arrangement of water molecules on the silver electrode surface with UPD lead is partially ordered
ELECTROCHEMICAL AND SPECTROELECTROCHEMICAL CHARACTERIZATION OF p-TRICYANOETHENYL-N,N-DIMETHYL ANILINE
Dong ZHANG , Yue Shun JIANG , De Jun WANG , Tie Jin LI , Bao Wen ZHANG
1992, 3(4): 305-306
[Abstract](164) [FullText HTML] [PDF 85KB](0)
Abstract:
The redox behaviours of a donor-acceptor model compound. p-tricyano-ethenyl-N, N-dimethyl aniline was investigated by electrochemical and spectroelectrochemical methods. The results indicate that charge transfer between the donor(amino) and the acceptor(cyanoethenyl) groups takes place in the process of oxidation of this compound
SYNTHESIS AND POLYMERIZATION KINETICS OF 1-BROMOMETHYL-7,7-DIMETHYLBICYCLO[2.2.1]HEPT-2-YL ACRYLATE
Xin Ru JIA , Ming Qian LI , Ji Ping SHAO , Shuo Jian JIANG
1992, 3(4): 307-310
[Abstract](150) [FullText HTML] [PDF 107KB](0)
Abstract:
Starting from camphene and NBS the 1-bromomethyl-7, 7-dimethylblcyclo-[2.2.1]hept-2-yl acrylate [BMCHA] has been synthesized by two steps. The polymerization kinetics equation of this monomer was obtained as follows:Rp=K[BPO]0.50[BMCHA]1.0 and the apparent activation energy of the polymerization was evaluated to be 82.96KJ/mol
THE APPLICATION OF MICROELECTRODE TO THE STUDY OF MULTISTEP ELECTRODE PROCESSES UNDER STEADY STATE CONDITIONS PART Ⅱ ECEAND DISP1 MECHANISMS
Qian Kun ZHUANG , Hong Yuan CHEN
1992, 3(4): 311-314
[Abstract](164) [FullText HTML] [PDF 121KB](0)
Abstract:
Under steady-state conditions, using the concept of steady-state reaction layer, the general currents of ECE and DISP1 reactions at microdisk electrode are derived. From these equations, some kinetic and electrode reaction parameters can be obtained
MECHANISM OF ELECTROCHEMILUMINESCENCE OF THE NEW REAGENT 6-(2-HYDROXY-DIETHYLAMINOPHENYLAZO)-2, 3-DIHYDRO-1, 4-PHTHALAZINE-1, 4-DIONE CATALYZED BY SILVER (Ⅰ)
Jing Ru AN , Jin Ming LIN
1992, 3(4): 315-318
[Abstract](161) [FullText HTML] [PDF 185KB](0)
Abstract:
The electrochemi luminescence of a new reagent 6-<2-hydroxy-4-diethylaminophenylazo>-2, 3-dihydro-1, 4-phthatazine-1, 4-dione in basic aqueous solution was studied. Trace amount of silver(I) showed significant effect on the efficiency of light emission of HDEA during a positive trigonometrical wave pulse was exerted on the electrodes In the present paper, the ecl spectra of HDEA have been measured. λmax is 410 nm. The reaction of HDEA chemiluminescence and the circular voltammetry, ultraviolet-visible spectrometry for the system have been investigated. The possible mechanism of the ecl of HDEA-KCL-KOH-Ag(I) system has been proposed
REDUCED EXTENT METHOD FOR THERMOKINETICS Ⅰ. MATHEMATICAL MODELS FOR KINETICS OF REVERSIBLE REACTIONS
Jing song LIU , Xian Cheng ZENG , An Ming TIAN , Yu DENG
1992, 3(4): 319-322
[Abstract](142) [FullText HTML] [PDF 135KB](1)
Abstract:
Some new mathematical models of reversible reaction kinetics have been suggested, and a reduced extent method for studies of thermokinetics of reversible reactions has been proposed
SOLID-STATE ELECTROCHROMIC DISPLAY
Sheng Shui ZHANG , Wei Hua CHOU , Xin Ping QIU , Qing Guo LIU , Lei Ling YANG , Bao Quan XING
1992, 3(4): 323-324
[Abstract](152) [FullText HTML] [PDF 89KB](0)
Abstract:
A novel electrochromic display composed of polymeric solid electrolyte and ferroin electroactive species has been assembled, which presents a reversible variation of the color between light blue and red when a potential of 0.98 and 0.75 V is applied respectively. The results indicate that the response speed is increased by lowering the concentration of ferroin without decreasing color contrast
THE STUDY ON THE SYNTHESES OF THREE NEW MICROPOROUS ALUMINOPHOSPHATES BY USING ETHYLENEDIAMINE AS TEMPLATE
Long YU , Wen Qin PANG
1992, 3(4): 325-328
[Abstract](143) [FullText HTML] [PDF 279KB](0)
Abstract:
Using ethylenediamine as template, we have hydrothermally synthesized three new microporous aluminophosphate crystals which were named AlPO4-CJ3, AlPO4-CJ6, AlPO4-CJ7, and characterized by means of X-ray powder diffraction, infrared spectroscopy, SEM, 13C solid state NMR and TG-DTA techniques
Address:Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888
Powered By info@rhhz.net