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2001 Volume 12 Issue 10
2001, 12(10): 847-850
Abstract:
The energy-transfer process between sodium ω-[2-(αt-naphthyl)ethoxy]undecanoate (FP-*) and sodium o-9-anthrylmethyl glutarate (AFP-) is accelerated by the formation of ESAg when cetyltrimethylammonium chloride (S16+) has been added to the solvent system of FP-* and AFP-. This result is yet another evidence for the formation of ESAg.
The energy-transfer process between sodium ω-[2-(αt-naphthyl)ethoxy]undecanoate (FP-*) and sodium o-9-anthrylmethyl glutarate (AFP-) is accelerated by the formation of ESAg when cetyltrimethylammonium chloride (S16+) has been added to the solvent system of FP-* and AFP-. This result is yet another evidence for the formation of ESAg.
2001, 12(10): 851-854
Abstract:
A [2+2] cycloaddition adduct 2 and a novel ring-opening product 3 were obtained from the reactions of 2,3-benzothiazepines 1 with dichloroacetyl chloride and triethylamine. The relative ratios of 2 and 3 were affected by the addition order of reactants and reaction temperature. The structures were determined by spectral data and the reaction mechanisms for the formation of 2 and 3 were elucidated.
A [2+2] cycloaddition adduct 2 and a novel ring-opening product 3 were obtained from the reactions of 2,3-benzothiazepines 1 with dichloroacetyl chloride and triethylamine. The relative ratios of 2 and 3 were affected by the addition order of reactants and reaction temperature. The structures were determined by spectral data and the reaction mechanisms for the formation of 2 and 3 were elucidated.
2001, 12(10): 855-858
Abstract:
A novel rearrangement-addition reaction of trisubstituted gibberellin epoxides with trimethylaluminium is reported. The reaction proceeds stereospecifically to give tertiary methyl alcohols. The possible mechanism for the reaction is also discussed.
A novel rearrangement-addition reaction of trisubstituted gibberellin epoxides with trimethylaluminium is reported. The reaction proceeds stereospecifically to give tertiary methyl alcohols. The possible mechanism for the reaction is also discussed.
2001, 12(10): 859-860
Abstract:
InCl3·4H2O catalyzes the cross-aldol condensation of cycloalkanones with aromatic aldehydes in sealed tube under solvent free condition to afford an efficient method for the synthesis of α, α-bis (substituted) benzylidenecycloalkanones.
InCl3·4H2O catalyzes the cross-aldol condensation of cycloalkanones with aromatic aldehydes in sealed tube under solvent free condition to afford an efficient method for the synthesis of α, α-bis (substituted) benzylidenecycloalkanones.
2001, 12(10): 861-864
Abstract:
Arylation of acrylamide and acrylonitrile were carried out with various arenediazonium tetrafluoroborates in the presence of a catalytic amount of Pd(OAc)2 in ethanol and a variety of substituted (E)-cinnamamides and (E)-cinnamonitriles were obtained in high yields under mild reaction conditions.
Arylation of acrylamide and acrylonitrile were carried out with various arenediazonium tetrafluoroborates in the presence of a catalytic amount of Pd(OAc)2 in ethanol and a variety of substituted (E)-cinnamamides and (E)-cinnamonitriles were obtained in high yields under mild reaction conditions.
2001, 12(10): 865-868
Abstract:
Stepwise oxidation of ketene dithioacetal is found and the different oxidation products changed with the amount of oxidant, temperature and reaction time.
Stepwise oxidation of ketene dithioacetal is found and the different oxidation products changed with the amount of oxidant, temperature and reaction time.
2001, 12(10): 869-872
Abstract:
Polyethylene glycol (PEG) supported (diacetoxy)iodobenzene as soluble polymer reagent can smoothly oxidize acid hydrazides into corresponding dimmers in good yields under very mild conditions.
Polyethylene glycol (PEG) supported (diacetoxy)iodobenzene as soluble polymer reagent can smoothly oxidize acid hydrazides into corresponding dimmers in good yields under very mild conditions.
2001, 12(10): 873-874
Abstract:
As a selenium transfer reagent, arylselenoamides react with acyl chlorides in chloroform to give diacyl selenides conveniently in good yield.
As a selenium transfer reagent, arylselenoamides react with acyl chlorides in chloroform to give diacyl selenides conveniently in good yield.
2001, 12(10): 875-876
Abstract:
Difloxacin hydrochloride, one of aryl-fluoro quinolone antibiotic, has been synthesized in seven steps from 2, 4-dichloro-5-fluoroacetophenone via oxalylation, ethoxymethylenation,amination, cyclization, hydrolysis, decarbonylation and N-methylpiperazination. Additional four new intermediates are produced.
Difloxacin hydrochloride, one of aryl-fluoro quinolone antibiotic, has been synthesized in seven steps from 2, 4-dichloro-5-fluoroacetophenone via oxalylation, ethoxymethylenation,amination, cyclization, hydrolysis, decarbonylation and N-methylpiperazination. Additional four new intermediates are produced.
2001, 12(10): 877-880
Abstract:
A series of diheterocyclic compounds containing 1,2,4-triazolo [l,5-a]pyrimidine and 1,3,4-oxadiazole were designed and synthesized starting from 2-mercapto-5,7-dimethyl-l,2,4-triazolo [ 1,5-a] pyrimidine. The structure of all compounds prepared were confirmed by H NMR spectroscopy and elemental analysis. The preliminary bioassay indicated that the title compounds displayed good fungicidal activity against Rhizoctonia solani.
A series of diheterocyclic compounds containing 1,2,4-triazolo [l,5-a]pyrimidine and 1,3,4-oxadiazole were designed and synthesized starting from 2-mercapto-5,7-dimethyl-l,2,4-triazolo [ 1,5-a] pyrimidine. The structure of all compounds prepared were confirmed by H NMR spectroscopy and elemental analysis. The preliminary bioassay indicated that the title compounds displayed good fungicidal activity against Rhizoctonia solani.
2001, 12(10): 881-882
Abstract:
The first asymmetry synthesis of glutinone and its three diastereoisomers were carried out in 8 steps and the stereochemistry of this natural product was given out.
The first asymmetry synthesis of glutinone and its three diastereoisomers were carried out in 8 steps and the stereochemistry of this natural product was given out.
2001, 12(10): 883-886
Abstract:
Two new naphthoquinones, nocardione A and B isolated from strain P-A0248, were synthesized from naphtho[1,2-b]furan 1. The furan 1 was prepared from 5-methoxyl-1-naphthol.
Two new naphthoquinones, nocardione A and B isolated from strain P-A0248, were synthesized from naphtho[1,2-b]furan 1. The furan 1 was prepared from 5-methoxyl-1-naphthol.
2001, 12(10): 887-888
Abstract:
As a non-specific modulator of macrophage, multiplied muramyl dipeptide (MMD) is solid-phase synthesized by application of standard Fmoc chemistry strategy. Tam's multiple antigen system (MAS) is used as our four branched-linker on Lysine.
As a non-specific modulator of macrophage, multiplied muramyl dipeptide (MMD) is solid-phase synthesized by application of standard Fmoc chemistry strategy. Tam's multiple antigen system (MAS) is used as our four branched-linker on Lysine.
2001, 12(10): 889-890
Abstract:
Those antibodies elicited by different tether site for attachment to carrier protein have different specificity. Herein we reported that a monoclonal antibody against morphine with high specificity and affinity was successfully produced by using different linkers to couple to different carrier proteins.
Those antibodies elicited by different tether site for attachment to carrier protein have different specificity. Herein we reported that a monoclonal antibody against morphine with high specificity and affinity was successfully produced by using different linkers to couple to different carrier proteins.
2001, 12(10): 891-892
Abstract:
A novel β-cyclodextrin derivative 6 bearing a crown ether moiety has been synthesized by a convenient method in 9.4% yield. Its self-assembled monolayer (SAM) was fabricated on the gold surface, which was characterized by using surface-enhanced Raman spectra.
A novel β-cyclodextrin derivative 6 bearing a crown ether moiety has been synthesized by a convenient method in 9.4% yield. Its self-assembled monolayer (SAM) was fabricated on the gold surface, which was characterized by using surface-enhanced Raman spectra.
2001, 12(10): 893-896
Abstract:
A new resveratrol tetramer, sinicin A was isolated from the roots of Ampelopsis sinica,with four known tetramers: vitisin A, cis-vitisin B, ampelopsin H and hopeaphenol. The structure and stereochemistry of sinicin A have been established on the basis of 1D and 2D NMR spectroscopic techniques.
A new resveratrol tetramer, sinicin A was isolated from the roots of Ampelopsis sinica,with four known tetramers: vitisin A, cis-vitisin B, ampelopsin H and hopeaphenol. The structure and stereochemistry of sinicin A have been established on the basis of 1D and 2D NMR spectroscopic techniques.
2001, 12(10): 897-898
Abstract:
A new 6,7-seco-ent-kaurane diterpenoid, together with two known ones, was isolated from the leaves of Isodon eriocalyx var. laxiflora C. Y. Wu & H. W. Li. Their structures were established by spectroscopic methods.
A new 6,7-seco-ent-kaurane diterpenoid, together with two known ones, was isolated from the leaves of Isodon eriocalyx var. laxiflora C. Y. Wu & H. W. Li. Their structures were established by spectroscopic methods.
2001, 12(10): 899-902
Abstract:
A new indole alkaloid, peduncin was isolated from the roots of Pueraria peduncularis.Its structure was established as 1 by NMR spectroscopic and X-ray crystallographic analysis.
A new indole alkaloid, peduncin was isolated from the roots of Pueraria peduncularis.Its structure was established as 1 by NMR spectroscopic and X-ray crystallographic analysis.
2001, 12(10): 903-906
Abstract:
Autolytimycin 1 was isolated from the culture filtrate of Streptomyces autolyticus JX-47,together with two known compounds, lebstatin 2 and 17-O-demethyl-geldanamycin 3. These compounds showed the activities of anti-HSV-I. The structure of 1 was determined by spectral analysis.
Autolytimycin 1 was isolated from the culture filtrate of Streptomyces autolyticus JX-47,together with two known compounds, lebstatin 2 and 17-O-demethyl-geldanamycin 3. These compounds showed the activities of anti-HSV-I. The structure of 1 was determined by spectral analysis.
2001, 12(10): 907-908
Abstract:
A chiral phosphorous derivatizing agent prepared from PCl3 and (S)-BINOL was described. It is used to determine the enantiomeric excess of chiral alcohols and amines by 31p NMR.
A chiral phosphorous derivatizing agent prepared from PCl3 and (S)-BINOL was described. It is used to determine the enantiomeric excess of chiral alcohols and amines by 31p NMR.
2001, 12(10): 909-912
Abstract:
The chromatographic behaviors of several uronic acid-containing polysaccharides and neutral polysaccharides were investigated in HPGPC for the first time. The effects of sample concentration and ionic strength of mobile phase on retention time were studied. The mechanism for the effects on Mw determination results of polysaccharides by HPGPC was also discussed.
The chromatographic behaviors of several uronic acid-containing polysaccharides and neutral polysaccharides were investigated in HPGPC for the first time. The effects of sample concentration and ionic strength of mobile phase on retention time were studied. The mechanism for the effects on Mw determination results of polysaccharides by HPGPC was also discussed.
2001, 12(10): 913-916
Abstract:
In situ Raman spectroscopic and voltammetric studies indicate that dissociative adsorption of methanol on the rough platinum electrode occurs in the hydrogen ad/desorption potential range, and the dissociative extent depends on the initial potential of the electrode before contacting methanol, in addition to the contacting time. As the dissociative product, carbon monoxide competes the site of strongly bound hydrogen preferentially, and shifts the ad/desorption potentials of weakly bound hydrogen towards more positive ones gradually with the increase of CO coverage. Whereas, formaldehyde dissociates more easily by far and completely suppresses H-adsorption. The confocal Raman spectroscopy developed on transition metals shows some intriguing advantages in investigating electrocatalytic oxidation of small organic molecules.
In situ Raman spectroscopic and voltammetric studies indicate that dissociative adsorption of methanol on the rough platinum electrode occurs in the hydrogen ad/desorption potential range, and the dissociative extent depends on the initial potential of the electrode before contacting methanol, in addition to the contacting time. As the dissociative product, carbon monoxide competes the site of strongly bound hydrogen preferentially, and shifts the ad/desorption potentials of weakly bound hydrogen towards more positive ones gradually with the increase of CO coverage. Whereas, formaldehyde dissociates more easily by far and completely suppresses H-adsorption. The confocal Raman spectroscopy developed on transition metals shows some intriguing advantages in investigating electrocatalytic oxidation of small organic molecules.
2001, 12(10): 917-920
Abstract:
A series of thermodynamic functions are applied to generalize the Benedict-Webb-Rubin equation. The method has been successfully applied to this equation, which reduced the constants of BWR equation from eight to one. The calculation of PVT behavior of water over the entire thermodynamic surface is successful with satisfactory deviation.
A series of thermodynamic functions are applied to generalize the Benedict-Webb-Rubin equation. The method has been successfully applied to this equation, which reduced the constants of BWR equation from eight to one. The calculation of PVT behavior of water over the entire thermodynamic surface is successful with satisfactory deviation.
2001, 12(10): 921-924
Abstract:
A novel binuclear europium β-diketone complex with squaric acid ligand was synthesized for the first time. Its structure was elucidated by IR, UV, and Elemental Analysis.Red light emitting diode (LED) was fabricated by using the novel europium complex as an emitting layer, tris(8-quinolinolate) aluminum (Ⅲ) (Alq3) as an electron-transporting layer, N,N'-diphenyl-N, N'-(3-methylphenyl)-l,l'-biphenyl-4,4'-diamine (TPD) as a hole-transporting layer.A cell structure of indium-tin-oxide/TPD/Eu-complex/Alq3/Mg: Ag was employed. Red electroluminescence was observed at room temperature with dc bias voltage of 2 V in this cell.Red emission peaks at about 613 nm with maximum luminance of over 106 cd/m2. Compared with the EL luminance from those europium complexes reported before, one from the Eu-complex is best in the same cells.
A novel binuclear europium β-diketone complex with squaric acid ligand was synthesized for the first time. Its structure was elucidated by IR, UV, and Elemental Analysis.Red light emitting diode (LED) was fabricated by using the novel europium complex as an emitting layer, tris(8-quinolinolate) aluminum (Ⅲ) (Alq3) as an electron-transporting layer, N,N'-diphenyl-N, N'-(3-methylphenyl)-l,l'-biphenyl-4,4'-diamine (TPD) as a hole-transporting layer.A cell structure of indium-tin-oxide/TPD/Eu-complex/Alq3/Mg: Ag was employed. Red electroluminescence was observed at room temperature with dc bias voltage of 2 V in this cell.Red emission peaks at about 613 nm with maximum luminance of over 106 cd/m2. Compared with the EL luminance from those europium complexes reported before, one from the Eu-complex is best in the same cells.
2001, 12(10): 925-928
Abstract:
The stability constants of the mononuclear complexes of BDBPH-Zn(II), Cd(Ⅱ) and Mn (Ⅱ) were determined by the potentiometric equilibrium measurements, and species distributions were also discussed. The metal ions do not combine with the ligand until the first two protons of the ligand have almost been completely neutralized. The main species were mononuclear complexes with the diprotonated ligand, MH2L. The three metal ions also form mono- and noprotonated (fully deprotonated) complexes, MHL, ML. The relative order of stabilities of the mononuclear complexes, ML, is Zn(Ⅱ) > Cd(Ⅱ) > Mn(Ⅱ). The ligand has strong tendency to form mononuclear complexes with Zn(Ⅱ), Cd(Ⅱ) and Mn(Ⅱ), and it can also form dinuclear complexes at high pH.
The stability constants of the mononuclear complexes of BDBPH-Zn(II), Cd(Ⅱ) and Mn (Ⅱ) were determined by the potentiometric equilibrium measurements, and species distributions were also discussed. The metal ions do not combine with the ligand until the first two protons of the ligand have almost been completely neutralized. The main species were mononuclear complexes with the diprotonated ligand, MH2L. The three metal ions also form mono- and noprotonated (fully deprotonated) complexes, MHL, ML. The relative order of stabilities of the mononuclear complexes, ML, is Zn(Ⅱ) > Cd(Ⅱ) > Mn(Ⅱ). The ligand has strong tendency to form mononuclear complexes with Zn(Ⅱ), Cd(Ⅱ) and Mn(Ⅱ), and it can also form dinuclear complexes at high pH.
2001, 12(10): 929-932
Abstract:
A novel electrocatalysis, ferrous ion catalyzed anodic-cathodic electrocatalysis (FACEC), was developed for organic pollutants degradation, which could promote the degradation by achieving synergetic effects of both anodic oxidation and cathodic indirect oxidation. The degradation rate of model pollutants - phenol by FACEC could increase by nearly 30% comparing with that of anodic electrocatalysis, and the current efficiency could reach 67%.
A novel electrocatalysis, ferrous ion catalyzed anodic-cathodic electrocatalysis (FACEC), was developed for organic pollutants degradation, which could promote the degradation by achieving synergetic effects of both anodic oxidation and cathodic indirect oxidation. The degradation rate of model pollutants - phenol by FACEC could increase by nearly 30% comparing with that of anodic electrocatalysis, and the current efficiency could reach 67%.
2001, 12(10): 933-934
Abstract:
A potentially versatile procedure for surface modification of nanometer silica is illustrated by N, N'-dicyclohexylcarbodiimide (DCC) mediated amidation of stearic acid.
A potentially versatile procedure for surface modification of nanometer silica is illustrated by N, N'-dicyclohexylcarbodiimide (DCC) mediated amidation of stearic acid.
2001, 12(10): 935-936
Abstract:
Polynaphthoxazines-clay nanocomposites were prepared from 1, 5-dihydroxynaphthalene, aniline, formaldehyde and different proportion montmorillonite(MMT) by in-situ reaction in ethanol. Dynamic TGA showed that nanocomposites have delayed decomposition temperatures when compared with pristine polynaphthoxazine indicating the enhancement in the thermal stability.
Polynaphthoxazines-clay nanocomposites were prepared from 1, 5-dihydroxynaphthalene, aniline, formaldehyde and different proportion montmorillonite(MMT) by in-situ reaction in ethanol. Dynamic TGA showed that nanocomposites have delayed decomposition temperatures when compared with pristine polynaphthoxazine indicating the enhancement in the thermal stability.
2001, 12(10): 937-940
Abstract:
The electrical conduction properties of dense BaCe0.9Mn0.1O3-δ (BCM10) membrane were investigated in the temperature range of 600-900℃. High ionic and electronic conductivities at elevated temperatures make BCM10 a potential ceramic material for hydrogen separation. Hydrogen permeation through BCM10 membranes was studied using a hightemperature permeation cell. Little hydrogen could be detected at the sweep side. However,appreciable hydrogen can permeate through BCM10 membrane coated with porous platinum black,which shows that the process of hydrogen permeation through BCM10 membranes was controlled by the catalytic decomposition and recomposition of hydrogen on the surfaces of BCM10 membranes.
The electrical conduction properties of dense BaCe0.9Mn0.1O3-δ (BCM10) membrane were investigated in the temperature range of 600-900℃. High ionic and electronic conductivities at elevated temperatures make BCM10 a potential ceramic material for hydrogen separation. Hydrogen permeation through BCM10 membranes was studied using a hightemperature permeation cell. Little hydrogen could be detected at the sweep side. However,appreciable hydrogen can permeate through BCM10 membrane coated with porous platinum black,which shows that the process of hydrogen permeation through BCM10 membranes was controlled by the catalytic decomposition and recomposition of hydrogen on the surfaces of BCM10 membranes.
