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2003 Volume 14 Issue 6
2003, 14(6): 551-554
Abstract:
An enantioselective total synthesis ofchiral daphneticin is reported firstly.
An enantioselective total synthesis ofchiral daphneticin is reported firstly.
2003, 14(6): 555-556
Abstract:
Regioselective oxidation of phenols to o-quinones with Dess-Martin periodinane isreported.
Regioselective oxidation of phenols to o-quinones with Dess-Martin periodinane isreported.
2003, 14(6): 557-560
Abstract:
The reaction of cryptotanshinone and tanshinone ⅡA with several biogenic aminemetabolites involved in the pathogenic pathways of HE were investigated and eight 1,2,3,4-tetrahydrophenanthrene derivatives, 2-6 and 8-10, were obtained. The probable mechanism onreaction was discussed.
The reaction of cryptotanshinone and tanshinone ⅡA with several biogenic aminemetabolites involved in the pathogenic pathways of HE were investigated and eight 1,2,3,4-tetrahydrophenanthrene derivatives, 2-6 and 8-10, were obtained. The probable mechanism onreaction was discussed.
2003, 14(6): 561-564
Abstract:
The addition-hydrolysis reaction of benzimidazolium salt with some mono- andbifunctional amine nucleophiles is reported, and a novel method of biomimetic synthesis forformamides and heterocycle compounds is provided.
The addition-hydrolysis reaction of benzimidazolium salt with some mono- andbifunctional amine nucleophiles is reported, and a novel method of biomimetic synthesis forformamides and heterocycle compounds is provided.
2003, 14(6): 565-568
Abstract:
In order to search for new potent anti-inflammatory and analgesic agents inpyrrolizinones, the title compounds were designed and synthesized. A series of the compoundswere prepared with two different synthetic schemes. Some of the compounds showed remarkableanti-inflammatory and/or analgesic activities on mice.
In order to search for new potent anti-inflammatory and analgesic agents inpyrrolizinones, the title compounds were designed and synthesized. A series of the compoundswere prepared with two different synthetic schemes. Some of the compounds showed remarkableanti-inflammatory and/or analgesic activities on mice.
2003, 14(6): 569-571
Abstract:
The novel structures of organometallic compounds 3-biaryl-1-ferrocenyl-2-propene-1-ones 5 were synthesized for nonlinear optical chromophores by Suzuki cross-coupling reaction.Their structures were determined with elemental analyses, 1H NMR spectra and 13C NMR spectra.
The novel structures of organometallic compounds 3-biaryl-1-ferrocenyl-2-propene-1-ones 5 were synthesized for nonlinear optical chromophores by Suzuki cross-coupling reaction.Their structures were determined with elemental analyses, 1H NMR spectra and 13C NMR spectra.
2003, 14(6): 572-574
Abstract:
A new 'two-armed' acyclic diamide Ⅰa 2, 6-bis(1-ethanecarbozamido-2-amino)pyridine,and a new series of aromatic aldehyde schiff bases containing pyridine ring and amide bridge, Ⅱa-f,were prepared. The compounds were characterized by elemental analysis, IR, 1HNMR and MS.The bioactivity half inhibitory concentration C1/2is given.
A new 'two-armed' acyclic diamide Ⅰa 2, 6-bis(1-ethanecarbozamido-2-amino)pyridine,and a new series of aromatic aldehyde schiff bases containing pyridine ring and amide bridge, Ⅱa-f,were prepared. The compounds were characterized by elemental analysis, IR, 1HNMR and MS.The bioactivity half inhibitory concentration C1/2is given.
2003, 14(6): 575-578
Abstract:
Photopromoted carbonylation of alkyl halides with carbon monoxide can be carried outunder ambient conditions with non-precious transition metal complexes (such as cobalt complexes) catalysts. Our preliminary work showed that alkyl halides can be transformed into alkene andalkane directly under irradiation, but the esters can not be transformed. It is assumed that thecarbonylation of alkyl halides may be proceeded in two ways.
Photopromoted carbonylation of alkyl halides with carbon monoxide can be carried outunder ambient conditions with non-precious transition metal complexes (such as cobalt complexes) catalysts. Our preliminary work showed that alkyl halides can be transformed into alkene andalkane directly under irradiation, but the esters can not be transformed. It is assumed that thecarbonylation of alkyl halides may be proceeded in two ways.
2003, 14(6): 579-580
Abstract:
A new chiral multidenate ligand (S, S)-1,7-bis(4-benzyloxazolin-2-yl-methyl)-1,7-diaza- 12-crown-41 has been synthesized and used as ligand in the copper catalyzed asymmetriccyclopropanation of 1, 1-diphenylethylene.
A new chiral multidenate ligand (S, S)-1,7-bis(4-benzyloxazolin-2-yl-methyl)-1,7-diaza- 12-crown-41 has been synthesized and used as ligand in the copper catalyzed asymmetriccyclopropanation of 1, 1-diphenylethylene.
2003, 14(6): 581-584
Abstract:
A series of arylsulfonamide and arylamide derivatives have been prepared from anisolein good yields. The structures of those compounds were confirmed by 1H-NMR and MS analysis.Their activities against platelet aggregation were tested in vitro by using the Born test on rabbits.
A series of arylsulfonamide and arylamide derivatives have been prepared from anisolein good yields. The structures of those compounds were confirmed by 1H-NMR and MS analysis.Their activities against platelet aggregation were tested in vitro by using the Born test on rabbits.
2003, 14(6): 585-587
Abstract:
A new disulfated triterpene glycoside named intercedenside B was isolated from the seacucumber Mensamaria intercedens Lampert. The structure was deduced from the spectral data.
A new disulfated triterpene glycoside named intercedenside B was isolated from the seacucumber Mensamaria intercedens Lampert. The structure was deduced from the spectral data.
2003, 14(6): 588-590
Abstract:
new Annonaceous acetogenin, squamostolide (1), was isolated from the seeds of Annona squamosa. Its structure was elucidated based on spectroscopic methods and comparisonwith known compounds. It is the first example of Annonaceous acetogenin with each of the twoends of the aliphatic chain bearing a γ-lactone. The new compound exhibited cytotoxic activity invitro against bel-7402 and CNE2 human tumor cell lines.
new Annonaceous acetogenin, squamostolide (1), was isolated from the seeds of Annona squamosa. Its structure was elucidated based on spectroscopic methods and comparisonwith known compounds. It is the first example of Annonaceous acetogenin with each of the twoends of the aliphatic chain bearing a γ-lactone. The new compound exhibited cytotoxic activity invitro against bel-7402 and CNE2 human tumor cell lines.
2003, 14(6): 591-593
Abstract:
The structures of two new abietane quinones, named micranthins A and B, weredetermined to be 7α-methoxy-14, 16-epoxy-8, 13-abietadiene-11, 12-dione (1) and 16-acetoxy-6,7-dehydroroyleanone (2) respectively, which were isolated from Isodon lophanthoides var.micranthus.
The structures of two new abietane quinones, named micranthins A and B, weredetermined to be 7α-methoxy-14, 16-epoxy-8, 13-abietadiene-11, 12-dione (1) and 16-acetoxy-6,7-dehydroroyleanone (2) respectively, which were isolated from Isodon lophanthoides var.micranthus.
2003, 14(6): 594-596
Abstract:
A novel cycloartane, named sphaerophysone A, 9, 19-cycloart-7β, 24β, 25-triol-1-en-3-one, was isolated from the ethanol extract of Sphaerophysa salsula DC. The structure waselucidated on the basis of spectral evidences and confirmed by X-ray analysis, the stereochemistryof the compound was also defined by X-ray analysis.
A novel cycloartane, named sphaerophysone A, 9, 19-cycloart-7β, 24β, 25-triol-1-en-3-one, was isolated from the ethanol extract of Sphaerophysa salsula DC. The structure waselucidated on the basis of spectral evidences and confirmed by X-ray analysis, the stereochemistryof the compound was also defined by X-ray analysis.
2003, 14(6): 597-598
Abstract:
A new morphinane alkaloid named as mecoquitupline was isolated from Meconopsis quintuplinervia Regel. Its structure was elucidated to be 6-methoxy-17-methyl-2,3-[methylenebis(oxy)]-morphinan-5-en-7-one by spectroscopic techniques.
A new morphinane alkaloid named as mecoquitupline was isolated from Meconopsis quintuplinervia Regel. Its structure was elucidated to be 6-methoxy-17-methyl-2,3-[methylenebis(oxy)]-morphinan-5-en-7-one by spectroscopic techniques.
2003, 14(6): 599-602
Abstract:
An on-line Ag/Al galvanic cell is investigated and employed to generateelectrochemiluminescence (ECL). The potential of the galvanic cell could be adjusted by varyingthe components of flow reagent. The cell performed perfect capability of supplying a stablepotential for ECL generation. Based on the weak ECL ofcalcein blue could be greatly sensitizedby the presence of calcium in alkaline solution, calcium contents in milk samples and in cabbagewere assayed and the results were compared with those from ICP-AES method.
An on-line Ag/Al galvanic cell is investigated and employed to generateelectrochemiluminescence (ECL). The potential of the galvanic cell could be adjusted by varyingthe components of flow reagent. The cell performed perfect capability of supplying a stablepotential for ECL generation. Based on the weak ECL ofcalcein blue could be greatly sensitizedby the presence of calcium in alkaline solution, calcium contents in milk samples and in cabbagewere assayed and the results were compared with those from ICP-AES method.
2003, 14(6): 603-604
Abstract:
A simple, effective HPLC method for separation of ephedrines was achieved by using1-butyl-3-methylimidazolium-tetrafluoroborate ionic liquid solution (0.1% v/v) as eluent at pH 3.0.The involved mechanism may be due to that the imidazolium cations can effectively shield thesilanol groups of alkylsilica surface, thereby decreasing band tailing and increasing the separationefficiency.
A simple, effective HPLC method for separation of ephedrines was achieved by using1-butyl-3-methylimidazolium-tetrafluoroborate ionic liquid solution (0.1% v/v) as eluent at pH 3.0.The involved mechanism may be due to that the imidazolium cations can effectively shield thesilanol groups of alkylsilica surface, thereby decreasing band tailing and increasing the separationefficiency.
2003, 14(6): 605-608
Abstract:
The coordination structure of aluminum in magnesium aluminum hydroxide was studiedby 27Al NMR. The result showed that tetrahedral aluminum (AlⅣ) existed in magnesiumaluminum hydroxide, and the contents of AlⅣ increased with the increase of the ratio of Al/Mg andwith the peptizing temperature. AlⅣ originated from the so-called Al13 polymer with the structureof one Al tetrahedron surrounded by twelve Al octahedrons.
The coordination structure of aluminum in magnesium aluminum hydroxide was studiedby 27Al NMR. The result showed that tetrahedral aluminum (AlⅣ) existed in magnesiumaluminum hydroxide, and the contents of AlⅣ increased with the increase of the ratio of Al/Mg andwith the peptizing temperature. AlⅣ originated from the so-called Al13 polymer with the structureof one Al tetrahedron surrounded by twelve Al octahedrons.
2003, 14(6): 609-610
Abstract:
The polytetrafluoroethylene fiber grafted acrylic acid was used as a cation exchanger.The exchange capacity of the cation fiber is 3.06 mmol/g. The maximum Cu2+ adsorptioncapacity is 107.48 mg/g. It could be desorbed completely by 1 mol/L HCl.
The polytetrafluoroethylene fiber grafted acrylic acid was used as a cation exchanger.The exchange capacity of the cation fiber is 3.06 mmol/g. The maximum Cu2+ adsorptioncapacity is 107.48 mg/g. It could be desorbed completely by 1 mol/L HCl.
2003, 14(6): 611-614
Abstract:
A novel gradient pressurized capillary electrochromatography (pCEC) instrument wasdeveloped to separate peptides. Two gradient elution modes, hydrophobic and hydrophilicinteraction mode in pCEC, were performed on this instrument. Baseline separation of sixpeptides was obtained on two gradient modes with C18 column and strong cationic exchangecolumn respectively. The effects of mixer volume and total flow rate of pumps on resolutionwere also discussed.
A novel gradient pressurized capillary electrochromatography (pCEC) instrument wasdeveloped to separate peptides. Two gradient elution modes, hydrophobic and hydrophilicinteraction mode in pCEC, were performed on this instrument. Baseline separation of sixpeptides was obtained on two gradient modes with C18 column and strong cationic exchangecolumn respectively. The effects of mixer volume and total flow rate of pumps on resolutionwere also discussed.
2003, 14(6): 615-618
Abstract:
MnFe1.4Ru0.45Cu0.15O4 was an effective heterogeneous catalyst for the oxidation ofvarious types of alcohols to the corresponding carbonyl compounds using atmospheric pressure ofoxygen under mild conditions. Furthermore, this catalyst was also effective towards alcoholoxidation using water as solvent instead of toluene.
MnFe1.4Ru0.45Cu0.15O4 was an effective heterogeneous catalyst for the oxidation ofvarious types of alcohols to the corresponding carbonyl compounds using atmospheric pressure ofoxygen under mild conditions. Furthermore, this catalyst was also effective towards alcoholoxidation using water as solvent instead of toluene.
2003, 14(6): 619-622
Abstract:
Through the method of initial heat release rate, the kinetic property of tyrosine oxidationcatalyzed by tyrosinase from Pseudomonas maltophilia was investigated using a LKB-2107 batchmicrocalorimeter. Tyrosine was catalyzed and oxidized into L-dopa, then into melanin catalyzed bytyrosinase. We found that the tyrosinase reaction obeyed the Michaelis-Menten kinetics, and at298.15K and pH 7.0, the initial exothermic rate (Ω0) are in the range of0.1567~0.5704 mJ·s-1, the maximum exothermic rate (Ωmax) are in 0.4152~0.8143mol·L-1, and mean value of the Michaelisconstant (Km) is 2.199±0.105×104 mol·L-1.
Through the method of initial heat release rate, the kinetic property of tyrosine oxidationcatalyzed by tyrosinase from Pseudomonas maltophilia was investigated using a LKB-2107 batchmicrocalorimeter. Tyrosine was catalyzed and oxidized into L-dopa, then into melanin catalyzed bytyrosinase. We found that the tyrosinase reaction obeyed the Michaelis-Menten kinetics, and at298.15K and pH 7.0, the initial exothermic rate (Ω0) are in the range of0.1567~0.5704 mJ·s-1, the maximum exothermic rate (Ωmax) are in 0.4152~0.8143mol·L-1, and mean value of the Michaelisconstant (Km) is 2.199±0.105×104 mol·L-1.
2003, 14(6): 623-626
Abstract:
The catalytic performances of four HRh(CO)(PPh3)3-diphosphine (BISBI, BDPX,BDNA and BINAP) systems in 1-dodecene hydroformylation were investigated and comparedwith HRh(CO)(PPh3)3-PPh3system. The catalyst system HRh(CO)(PPh3)3- BISBI exhibited veryhigh regioselectivity for the formation of linear aldehyde.
The catalytic performances of four HRh(CO)(PPh3)3-diphosphine (BISBI, BDPX,BDNA and BINAP) systems in 1-dodecene hydroformylation were investigated and comparedwith HRh(CO)(PPh3)3-PPh3system. The catalyst system HRh(CO)(PPh3)3- BISBI exhibited veryhigh regioselectivity for the formation of linear aldehyde.
2003, 14(6): 627-630
Abstract:
The oxygenation of cobalt (Ⅱ) hydroxamates (CoL2) and its catalytic performance inoxidation of p-xylene to p-toluic acid (PTA) were examined. The effects of X and Y bonded tohydroxamate group on dioxygen affinities and catalytic oxidation performance were alsoinvestigated.
The oxygenation of cobalt (Ⅱ) hydroxamates (CoL2) and its catalytic performance inoxidation of p-xylene to p-toluic acid (PTA) were examined. The effects of X and Y bonded tohydroxamate group on dioxygen affinities and catalytic oxidation performance were alsoinvestigated.
2003, 14(6): 631-633
Abstract:
Hydrogen production at room temperature from liquid methanol has been conductedusing corona discharge. The content of water in methanol solution has a significant effect on thisproduction. When water concentration increases from 1.0% to 16.7%, the methanol conversionrate changes from 0.196 to 0.284 mol/h. An important finding in this investigation is theformation of ethylene glycol as a major by-product. The yield of ethylene glycol is ranged from0.0045 to 0.0075 mol/h based on the water content.
Hydrogen production at room temperature from liquid methanol has been conductedusing corona discharge. The content of water in methanol solution has a significant effect on thisproduction. When water concentration increases from 1.0% to 16.7%, the methanol conversionrate changes from 0.196 to 0.284 mol/h. An important finding in this investigation is theformation of ethylene glycol as a major by-product. The yield of ethylene glycol is ranged from0.0045 to 0.0075 mol/h based on the water content.
2003, 14(6): 634-636
Abstract:
A new series of binary mixture ionic liquids comprising 1-ethyl-3-methylimidozaliumbromide (EMIMBr) and imidazole (IM) have been synthesized. The melting points of the ionicliquids vary with the different content of IM while they still keep satisfactory conductivity andviscosity. According to the analysis of its phase diagram, the eutectic point is about 16.5℃ withthe mass percentage of IM 29%.
A new series of binary mixture ionic liquids comprising 1-ethyl-3-methylimidozaliumbromide (EMIMBr) and imidazole (IM) have been synthesized. The melting points of the ionicliquids vary with the different content of IM while they still keep satisfactory conductivity andviscosity. According to the analysis of its phase diagram, the eutectic point is about 16.5℃ withthe mass percentage of IM 29%.
2003, 14(6): 637-640
Abstract:
Mesoporous aluminosilicate with cubic ordered structure was synthesized by two-stepcrystallization, which showed stronger acid sites and more effective activity for catalytic alkylationof 2, 4-ditert-butylphenol with tert-butanol than conventional H-AlMCM-48 materials.
Mesoporous aluminosilicate with cubic ordered structure was synthesized by two-stepcrystallization, which showed stronger acid sites and more effective activity for catalytic alkylationof 2, 4-ditert-butylphenol with tert-butanol than conventional H-AlMCM-48 materials.
2003, 14(6): 641-644
Abstract:
A novel dye dimer, bis-{[1-(N-hexadecyl-4-pyridinium)-2-(4-N, N-dimethylamino-phenyl)] ethenyl}methane diiodide (C16BP) was synthesized, and the photoelectrochemistry of thedye Langmuir-Blodgett monolayer modified ITO electrode was investigated. For comparison, thephotoelectrochemistry of the monomer (E)-N-hexadecyl-4-[2-(4-N, N-dimethylaminophenyl)ethenyl] pyridinium iodide (C16P) was also measured. The results show that the photocurrentgeneration property of the dimer is enhanced. The photocurrent generation quantum yield is0.38% for C16BP, while that for C16P is 0.23%.
A novel dye dimer, bis-{[1-(N-hexadecyl-4-pyridinium)-2-(4-N, N-dimethylamino-phenyl)] ethenyl}methane diiodide (C16BP) was synthesized, and the photoelectrochemistry of thedye Langmuir-Blodgett monolayer modified ITO electrode was investigated. For comparison, thephotoelectrochemistry of the monomer (E)-N-hexadecyl-4-[2-(4-N, N-dimethylaminophenyl)ethenyl] pyridinium iodide (C16P) was also measured. The results show that the photocurrentgeneration property of the dimer is enhanced. The photocurrent generation quantum yield is0.38% for C16BP, while that for C16P is 0.23%.
2003, 14(6): 645-648
Abstract:
Ag nanoparticles used as physical developing nuclei in photographic science wereprepared by reduction method. The as-formed Ag nanoparticle colloid was characterized byUV-Vis absorption spectrum, Atomic Force Microscopy(AFM) and Charge Coupled Device (CCD)technique. It is found that the source of Ag ions, the addition of surfactant and polymer, all havegreat influence on the size, topography and catalytic activity of Ag nanoparticles.
Ag nanoparticles used as physical developing nuclei in photographic science wereprepared by reduction method. The as-formed Ag nanoparticle colloid was characterized byUV-Vis absorption spectrum, Atomic Force Microscopy(AFM) and Charge Coupled Device (CCD)technique. It is found that the source of Ag ions, the addition of surfactant and polymer, all havegreat influence on the size, topography and catalytic activity of Ag nanoparticles.
2003, 14(6): 649-652
Abstract:
Heterogenous photocatalyzed reduction of aqueous Na2CO3 has been carried out byusing nano SrFeO3 semiconductor powders. Formic acid, formaldehyde and methyl alcoholwere identified as photoproducts, and were measured spectrophotometrically. The effect of thevariation of different parameters such as sodium carbonate concentration, amount of photocatalystand different light sources on the yield of photoproducts was also investigated. It shows thatnano SrFeO3 has photocatalytic activity. Irradiation leads to the production of electrons in theconduction band of the SrFeO3 semiconductor. It is likely that the photoproduced electronsreduce CO32- initially to HCOO-, and then to HCHO and CH3OH.
Heterogenous photocatalyzed reduction of aqueous Na2CO3 has been carried out byusing nano SrFeO3 semiconductor powders. Formic acid, formaldehyde and methyl alcoholwere identified as photoproducts, and were measured spectrophotometrically. The effect of thevariation of different parameters such as sodium carbonate concentration, amount of photocatalystand different light sources on the yield of photoproducts was also investigated. It shows thatnano SrFeO3 has photocatalytic activity. Irradiation leads to the production of electrons in theconduction band of the SrFeO3 semiconductor. It is likely that the photoproduced electronsreduce CO32- initially to HCOO-, and then to HCHO and CH3OH.
2003, 14(6): 653-656
Abstract:
The synthesis and surfactant activities of two new cationic gemini surfactants containingtriazole compound as spacer were described. Their critical micelle concentrations (CMC), whichare 1.8×l0-4 mol/L and 3.9×10-4 mol/L respectively, are much lower than that of conventionalsurfactant cetyltrimethyl ammonium chloride (CTAC). In addition, compared with some geminisurfactants containing phenylene, xylylene and stilbenyl as spacer, this new kind of surfactants hasgood solubility in water at room temperature because of containing more hydrophilic groups oratoms in molecules.
The synthesis and surfactant activities of two new cationic gemini surfactants containingtriazole compound as spacer were described. Their critical micelle concentrations (CMC), whichare 1.8×l0-4 mol/L and 3.9×10-4 mol/L respectively, are much lower than that of conventionalsurfactant cetyltrimethyl ammonium chloride (CTAC). In addition, compared with some geminisurfactants containing phenylene, xylylene and stilbenyl as spacer, this new kind of surfactants hasgood solubility in water at room temperature because of containing more hydrophilic groups oratoms in molecules.
2003, 14(6): 657-660
Abstract:
Two new bithiophene derivatives named as 5, 5'-bis(p-N,N-dimethylaminostyryl)-2, 2'-bithiophene (BMSBT), and 5, 5'-bis(p-N,N-diethylaminostyryl)-2, 2'-bithiophene (BESBT) havebeen synthesized. Both compounds can emit strong single-photon excited fluorescence (SPEF)and two-photon excited fluorescence (TPEF) with the emission peaks around ~560 nm and withthe lifetime of~lns.
Two new bithiophene derivatives named as 5, 5'-bis(p-N,N-dimethylaminostyryl)-2, 2'-bithiophene (BMSBT), and 5, 5'-bis(p-N,N-diethylaminostyryl)-2, 2'-bithiophene (BESBT) havebeen synthesized. Both compounds can emit strong single-photon excited fluorescence (SPEF)and two-photon excited fluorescence (TPEF) with the emission peaks around ~560 nm and withthe lifetime of~lns.
