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2003 Volume 14 Issue 1
2003, 14(1): 1-2
Abstract:
A concise and efficient synthesis of the pentacyclic intermcdiate 1, as a simple model compound of Ectcinascidin 743 and its analogues, is described.
A concise and efficient synthesis of the pentacyclic intermcdiate 1, as a simple model compound of Ectcinascidin 743 and its analogues, is described.
2003, 14(1): 3-5
Abstract:
α-Phenylthio-α, β-unsaturated esters 6 were synthesized by Witting reaction of 3, which were prepared by a phenylsulfenyllation-trans-ylidation reaction.
α-Phenylthio-α, β-unsaturated esters 6 were synthesized by Witting reaction of 3, which were prepared by a phenylsulfenyllation-trans-ylidation reaction.
2003, 14(1): 6-8
Abstract:
A 1-β-methylcarbapencm analogue 6 was synthcsized on polystyrene-dicthylsilane resin (PS-DES) using 2-azetidinone bearing with 2-oxazolidonc chiral auxiliary as starting matcrial.
A 1-β-methylcarbapencm analogue 6 was synthcsized on polystyrene-dicthylsilane resin (PS-DES) using 2-azetidinone bearing with 2-oxazolidonc chiral auxiliary as starting matcrial.
2003, 14(1): 9-12
Abstract:
A novel β-cyclodextrin dimer bearing 2, 9-diformyl-1, 10-phenanthroline tether 4 has been synthesized and its inclusion complexation behavior with two triangular model substrates(RhB and BG) has been investigated through fluorcseence and ultraviolet spectrometry. The result obtained indicated that novel bridged bis(β-cyclodcxtrin)s could significantly enhance the original molecular binding ability of native β-cyclodextrin by coopcrative binding of two hydrophobie cavities.
A novel β-cyclodextrin dimer bearing 2, 9-diformyl-1, 10-phenanthroline tether 4 has been synthesized and its inclusion complexation behavior with two triangular model substrates(RhB and BG) has been investigated through fluorcseence and ultraviolet spectrometry. The result obtained indicated that novel bridged bis(β-cyclodcxtrin)s could significantly enhance the original molecular binding ability of native β-cyclodextrin by coopcrative binding of two hydrophobie cavities.
2003, 14(1): 13-16
Abstract:
In the case of Pd(PPh3)4 as catalyst and toluene as reaction solvent, the desired biaryls and polyaryls were synthesized in excellent yicld and on a large scale.
In the case of Pd(PPh3)4 as catalyst and toluene as reaction solvent, the desired biaryls and polyaryls were synthesized in excellent yicld and on a large scale.
2003, 14(1): 17-19
Abstract:
Esterification reaction of carboxylic acid and alcohol has been carried out in excellent yield with expandable graphite as a catalyst.
Esterification reaction of carboxylic acid and alcohol has been carried out in excellent yield with expandable graphite as a catalyst.
2003, 14(1): 20-21
Abstract:
Nano CaCO3 was used as a condensation agent in the ring-opening reaction of p-tert-butylcalix[4]arcnc with cpichlorohydrin to afford 5,11,17,23-tetra-tert-butyl-26,27,28-trihyd-roxy-25-(l'-chloro-2'-hydroxy-3'-propyl)calix[4]arcnc rcgiosclcctivcly in 52% yield. The yield was less lhan 2% by using normal CaCO3 instead of nano one under the same condilions.
Nano CaCO3 was used as a condensation agent in the ring-opening reaction of p-tert-butylcalix[4]arcnc with cpichlorohydrin to afford 5,11,17,23-tetra-tert-butyl-26,27,28-trihyd-roxy-25-(l'-chloro-2'-hydroxy-3'-propyl)calix[4]arcnc rcgiosclcctivcly in 52% yield. The yield was less lhan 2% by using normal CaCO3 instead of nano one under the same condilions.
2003, 14(1): 22-24
Abstract:
Two fluorescent indocyanine dyes containing at least one p-carboxybenzyl group on the nitrogen atoms in the hetcrocyclic rings were designed and synthesized. Their absorption maxima were 549 nm and 551 nm in water respectively. They had good water solubility and photostability.
Two fluorescent indocyanine dyes containing at least one p-carboxybenzyl group on the nitrogen atoms in the hetcrocyclic rings were designed and synthesized. Their absorption maxima were 549 nm and 551 nm in water respectively. They had good water solubility and photostability.
2003, 14(1): 25-28
Abstract:
A simple and efficient procedure for synthesis of 1-hydroxymcthylene-1,1-bisphosphoates from aldehydes is deseribed. This method was applied to the synthesis of nowel catcchol substituted bisphosphonatcs as the anti-ostcoporosis agents.
A simple and efficient procedure for synthesis of 1-hydroxymcthylene-1,1-bisphosphoates from aldehydes is deseribed. This method was applied to the synthesis of nowel catcchol substituted bisphosphonatcs as the anti-ostcoporosis agents.
2003, 14(1): 29-31
Abstract:
A convenient and large-scale preparation of rctinoic acid 1 from β-ionone in five steps with 38% overall yield is described. The key steps are the epoxidization of 2 with a new methylated agent and the condensation 4 with tetraethyl methylenediphophonate in one-pot procedure to prepare 6.
A convenient and large-scale preparation of rctinoic acid 1 from β-ionone in five steps with 38% overall yield is described. The key steps are the epoxidization of 2 with a new methylated agent and the condensation 4 with tetraethyl methylenediphophonate in one-pot procedure to prepare 6.
2003, 14(1): 32-34
Abstract:
Poly(ε-caprolactone) (PCL) with weight-average molar mass over 10000 g/mol was synthesized by microwave-assisted ring-opening polymerization of ε-caprolactonc (ε-CL) with malcic acid (MA) as initiator (2.45 GHz, 360 W, 85 min). Ibuprofen-PCL controlled release system was prepared directly by the ROP of ε-CL in its mixture with ibuprofen. The release of ibuprofen from the system was sustained and steady.
Poly(ε-caprolactone) (PCL) with weight-average molar mass over 10000 g/mol was synthesized by microwave-assisted ring-opening polymerization of ε-caprolactonc (ε-CL) with malcic acid (MA) as initiator (2.45 GHz, 360 W, 85 min). Ibuprofen-PCL controlled release system was prepared directly by the ROP of ε-CL in its mixture with ibuprofen. The release of ibuprofen from the system was sustained and steady.
2003, 14(1): 35-38
Abstract:
Ferrocene-terminated trans-Ru(dppm)2 (dppm=Ph2PCH2PPh2)-containing molecular wires with alligator clips were prepared. They are suitable for self-asscmbly on gold electrode to investigate the influence of metal incorporation on the electron transportation property of the molecular wires.
Ferrocene-terminated trans-Ru(dppm)2 (dppm=Ph2PCH2PPh2)-containing molecular wires with alligator clips were prepared. They are suitable for self-asscmbly on gold electrode to investigate the influence of metal incorporation on the electron transportation property of the molecular wires.
2003, 14(1): 39-42
Abstract:
Pyrcnc probc and TEM have been employed to investigate the behavior of a polystyrenc-b-poly(acrylic aeid) (PS-b-PAA) copolymer in aqueous solution. A significant annealing temperature effect on the I1/I3 ratio of pyrene was observed and was interpreted in terms ofthe morphological change ofmicellar cores. Anncaling at a temperature higher than the glass transition temperature (Tg) of PS leads to densification ofthe hydrophobic core.
Pyrcnc probc and TEM have been employed to investigate the behavior of a polystyrenc-b-poly(acrylic aeid) (PS-b-PAA) copolymer in aqueous solution. A significant annealing temperature effect on the I1/I3 ratio of pyrene was observed and was interpreted in terms ofthe morphological change ofmicellar cores. Anncaling at a temperature higher than the glass transition temperature (Tg) of PS leads to densification ofthe hydrophobic core.
Synthesis and Photoluminescence of New Europium Complex Eu(DBM)3(DPPZ) with Dipyridophenazine Ligand
2003, 14(1): 43-46
Abstract:
Dipyrido [3, 2-a:2',3'-c] phenazine moiety has been introduced as neutral ligand in europium complex. Therefore, a new europium complex with saturated emission, strong fluorescent intensity and good solubility was designed and synthesized for the first time. Its photoluminescence and UV properties were examined. The experimental results showed that this new Eu-complex could be used as red electroluminescent materials.
Dipyrido [3, 2-a:2',3'-c] phenazine moiety has been introduced as neutral ligand in europium complex. Therefore, a new europium complex with saturated emission, strong fluorescent intensity and good solubility was designed and synthesized for the first time. Its photoluminescence and UV properties were examined. The experimental results showed that this new Eu-complex could be used as red electroluminescent materials.
2003, 14(1): 47-50
Abstract:
End grafted polyacrylonitrile (PAN) brush was prepared through surface initiated polymerization via the chain transfer process. The thiol-terminated monolayer and PAN brushes were characterized by FTIR, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), ellipsometry and contact angle measurements ete. It is demonstrated that radical chain transfer reaction and surface initiated precipitate polymerization can be used to prepare end-grafted polymer brushes.
End grafted polyacrylonitrile (PAN) brush was prepared through surface initiated polymerization via the chain transfer process. The thiol-terminated monolayer and PAN brushes were characterized by FTIR, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), ellipsometry and contact angle measurements ete. It is demonstrated that radical chain transfer reaction and surface initiated precipitate polymerization can be used to prepare end-grafted polymer brushes.
2003, 14(1): 51-53
Abstract:
The chemical structure of an exopolysaecharide (EPS) produced by Sorangium cellulosum NUST06 was investigated. The EPS was found to have molecular masses greater than 2×,106Da. and consisted ofD-glucose, D-mannose and D-glucuronic aeid in a ratio of 5:4:1. The analytieal results of methylation and nuelear magnetic resonance spectra suggested the EPS consist of following tetrasaeeharide repeating units:→4)-β-D-Glup-(1→4)-β-D-Glup-(1→4)-β-D-Glup-(1→???
The chemical structure of an exopolysaecharide (EPS) produced by Sorangium cellulosum NUST06 was investigated. The EPS was found to have molecular masses greater than 2×,106Da. and consisted ofD-glucose, D-mannose and D-glucuronic aeid in a ratio of 5:4:1. The analytieal results of methylation and nuelear magnetic resonance spectra suggested the EPS consist of following tetrasaeeharide repeating units:→4)-β-D-Glup-(1→4)-β-D-Glup-(1→4)-β-D-Glup-(1→???
2003, 14(1): 54-57
Abstract:
A novel antimicrobial polypeptidc was isolated and charaeterized from loach, Misgurmis anguillieaudatus, The polypcptide, named MAPP, is a single-chain polypcptide with Mw about 9,800 Dalton and p1 about 4.78;the N-tag ofMAPP was CFGWN. MAPP showed good inhibition against various bacteria including Bacillus subtilis, Eseherichia coli and Staphylococcus aurens. MAPP could be used as a lead compound in antibiotics drug discovery.
A novel antimicrobial polypeptidc was isolated and charaeterized from loach, Misgurmis anguillieaudatus, The polypcptide, named MAPP, is a single-chain polypcptide with Mw about 9,800 Dalton and p1 about 4.78;the N-tag ofMAPP was CFGWN. MAPP showed good inhibition against various bacteria including Bacillus subtilis, Eseherichia coli and Staphylococcus aurens. MAPP could be used as a lead compound in antibiotics drug discovery.
2003, 14(1): 58-61
Abstract:
Anew diterpenoid dimer annonebinide A has been isolated from the stems ofAnnona glabra. Its structure was determined to be ent-16α-hydroxykauran-17-yl ent-16β-kauran-17-oate on the basis ofspectroscopic and chemical evidence.
Anew diterpenoid dimer annonebinide A has been isolated from the stems ofAnnona glabra. Its structure was determined to be ent-16α-hydroxykauran-17-yl ent-16β-kauran-17-oate on the basis ofspectroscopic and chemical evidence.
2003, 14(1): 62-65
Abstract:
Two new iononc derivatives, named rhododcndronc and rhododcndronsidc, were isolated from the alcoholic extract of the aerial parts of Rhododendron przwalskii Maxim. Their structures were elucidated on the basis of spectroscopic analysis
Two new iononc derivatives, named rhododcndronc and rhododcndronsidc, were isolated from the alcoholic extract of the aerial parts of Rhododendron przwalskii Maxim. Their structures were elucidated on the basis of spectroscopic analysis
2003, 14(1): 66-67
Abstract:
A new acylated tlavonoid glycoside, 3-O-kaempferol-3-O-acetyl-6-O-(P-coumaroyl)-β-D-glucopyranoside 1 was isolated from the whole plant of Anaphalis aureo-punctata. The structure was established by spectral methods.
A new acylated tlavonoid glycoside, 3-O-kaempferol-3-O-acetyl-6-O-(P-coumaroyl)-β-D-glucopyranoside 1 was isolated from the whole plant of Anaphalis aureo-punctata. The structure was established by spectral methods.
2003, 14(1): 68-71
Abstract:
Two new steroidal bitter principles, taccolanolide O, P have been isolated from Tacca subflaellata and their structures were established by spectroscopic methods.
Two new steroidal bitter principles, taccolanolide O, P have been isolated from Tacca subflaellata and their structures were established by spectroscopic methods.
2003, 14(1): 72-75
Abstract:
Density Funetional Theory (DFT) method was used in this paper to study one-carbon transfer from 1.10-tetrahydroquinoxalinc, an analoguc of tetrahydrofolic aeid, to methylamine.This reaetion can be completedvia two paths. From the computation result we can conclude thai a general-aeid catalysis exists in this reaction. By computation we find DFT has its limitation in deseribing a newly incorporated structure with a unit charge.
Density Funetional Theory (DFT) method was used in this paper to study one-carbon transfer from 1.10-tetrahydroquinoxalinc, an analoguc of tetrahydrofolic aeid, to methylamine.This reaetion can be completedvia two paths. From the computation result we can conclude thai a general-aeid catalysis exists in this reaction. By computation we find DFT has its limitation in deseribing a newly incorporated structure with a unit charge.
2003, 14(1): 76-78
Abstract:
Two possible lower barrier reaction pathways in the reaction HF+HOBO→H2O+FBO are predicated by means of MP2 and CCSD(T) (single-point) methods. In the two channels, two stable intermediates are loeated and thus,they are multi-step channels,which are more favorable in energy than direct single-step reaction pathway predicated by previous theoretical study. Therefore,the two pathways should be main reaction channels in experiments.
Two possible lower barrier reaction pathways in the reaction HF+HOBO→H2O+FBO are predicated by means of MP2 and CCSD(T) (single-point) methods. In the two channels, two stable intermediates are loeated and thus,they are multi-step channels,which are more favorable in energy than direct single-step reaction pathway predicated by previous theoretical study. Therefore,the two pathways should be main reaction channels in experiments.
2003, 14(1): 79-82
Abstract:
A positive Mg-Al-nitrate layered double hydroxides (LDHs) has been synthesized using a non-steady coprccipitation method. The shape, size, chemical composition, electrical property and anion exchange property of the positive nanoparticle were studied by SEM, XRD, FTIR,chemical analysis, spectroanalysis and measuring of electrophoretic mobilities. Preliminary results show the positive nanopartiele is a promising precursor ofpolymer/LDHs nanocomposite.
A positive Mg-Al-nitrate layered double hydroxides (LDHs) has been synthesized using a non-steady coprccipitation method. The shape, size, chemical composition, electrical property and anion exchange property of the positive nanoparticle were studied by SEM, XRD, FTIR,chemical analysis, spectroanalysis and measuring of electrophoretic mobilities. Preliminary results show the positive nanopartiele is a promising precursor ofpolymer/LDHs nanocomposite.
2003, 14(1): 83-86
Abstract:
The metastable phase 3c-Fe7S8 with the hexagonal platelct morphology has been prepared by using solvothcrmal routc. The product was charactcrized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelcctron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.
The metastable phase 3c-Fe7S8 with the hexagonal platelct morphology has been prepared by using solvothcrmal routc. The product was charactcrized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelcctron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.
2003, 14(1): 87-90
Abstract:
The elegant 2D multiquantum (MQ) MAS NMR has been applied to invcstigatc the coordination of Al atoms in SAPO-34. The results show that the effects of the template and/or water on the coordination of Al atoms are significanl, which lead to the formation of various Al species. Up to four kinds of Al species are distinctly resolved.
The elegant 2D multiquantum (MQ) MAS NMR has been applied to invcstigatc the coordination of Al atoms in SAPO-34. The results show that the effects of the template and/or water on the coordination of Al atoms are significanl, which lead to the formation of various Al species. Up to four kinds of Al species are distinctly resolved.
2003, 14(1): 91-93
Abstract:
Effects on the recycling effieieney of thermoregulated phase-separable Rh/PETPP (P-[p-C6H4O(CH2CH2O)nH]3, N=3n) complex catalyst involved in hydroformylation of 1-decene are for the first time presented. It was found that the loss of Rh is dependent greatly on the composition of phosphine ligand PETPP and the organic solvent employed in the reaetion.
Effects on the recycling effieieney of thermoregulated phase-separable Rh/PETPP (P-[p-C6H4O(CH2CH2O)nH]3, N=3n) complex catalyst involved in hydroformylation of 1-decene are for the first time presented. It was found that the loss of Rh is dependent greatly on the composition of phosphine ligand PETPP and the organic solvent employed in the reaetion.
2003, 14(1): 94-95
Abstract:
The crystal structure of novel coordination polymer with cxeellent charaeteristic luninescence of Eu3+, the three-dimentional network of {Eu2(p-BDC)3(Phen)2(H2O)2}n is presented.
The crystal structure of novel coordination polymer with cxeellent charaeteristic luninescence of Eu3+, the three-dimentional network of {Eu2(p-BDC)3(Phen)2(H2O)2}n is presented.
2003, 14(1): 96-99
Abstract:
3-Aminopropyltricthoxysilanc (AM), 3-cthyldiaminopropyltrimcthoxysilane (ED) and 3-piperazinylpropyltriethoxysilanc (PZ), were used to chemically couple with the silanol groups of calcined hexagonal and hexagonal-like mesoporous silica SBA-3 and HMS, respectively, to produce functionalised alkaline mesoporous materials. The inerease in the dosage of organosilanes, or in reaction temperature, or in the humidity (i.e., water content) of support, is favorable to the grafting of functional molecules on the surface. When functionalization conditions are the same, the order of loadings on SBA-3 and DDA-HMS is ED > AM > PZ. However, on ODA-HMS, the loading of AM is similar to that of ED.
3-Aminopropyltricthoxysilanc (AM), 3-cthyldiaminopropyltrimcthoxysilane (ED) and 3-piperazinylpropyltriethoxysilanc (PZ), were used to chemically couple with the silanol groups of calcined hexagonal and hexagonal-like mesoporous silica SBA-3 and HMS, respectively, to produce functionalised alkaline mesoporous materials. The inerease in the dosage of organosilanes, or in reaction temperature, or in the humidity (i.e., water content) of support, is favorable to the grafting of functional molecules on the surface. When functionalization conditions are the same, the order of loadings on SBA-3 and DDA-HMS is ED > AM > PZ. However, on ODA-HMS, the loading of AM is similar to that of ED.
Synthesis of Crystalline Nanosized Titanium Dioxide via a Reverse Micelle Method at Room Temperature
2003, 14(1): 100-103
Abstract:
Crystalline TiO2 nanoparticles were synthesized by hydrolysis of titanium tetrabutoxidein the presence of hydrochloric aeid in NP-5 (lgepal CO-520)/ cyclohcxane reverse micellesolution at room temperature. Pure rutilc nanoparticles were obtained at an appropriate acidconcentration. The influcnces of various reaction conditions such as the concentration of acids,water content value (w=[H2O]/[NP-5]) on the formation, crystal phase, morphology, and size of theTiO2 particles were investigated.
Crystalline TiO2 nanoparticles were synthesized by hydrolysis of titanium tetrabutoxidein the presence of hydrochloric aeid in NP-5 (lgepal CO-520)/ cyclohcxane reverse micellesolution at room temperature. Pure rutilc nanoparticles were obtained at an appropriate acidconcentration. The influcnces of various reaction conditions such as the concentration of acids,water content value (w=[H2O]/[NP-5]) on the formation, crystal phase, morphology, and size of theTiO2 particles were investigated.
2003, 14(1): 104-107
Abstract:
An easy preparation of controlled alumina nanoparticles by the solution precipitate method has been carried out using dendrimer as surfactant. The effects of the amount and size of surfactant on morphological control ofpowder have also been discussed.
An easy preparation of controlled alumina nanoparticles by the solution precipitate method has been carried out using dendrimer as surfactant. The effects of the amount and size of surfactant on morphological control ofpowder have also been discussed.
2003, 14(1): 108-110
Abstract:
Montmorillonite (MMT) was modified through intercalative polymerization of phenol and formaldchyde catalyzed by oxalic aeid. The modified montmorillonite was delaminated at large, as demonstrated by XRD and TEM studies. It can disperse easily in epoxy resin to form exfoliated nanocomp osites. The nanoscale silicate platclets dispersed in water can be metallized by silver deposition.
Montmorillonite (MMT) was modified through intercalative polymerization of phenol and formaldchyde catalyzed by oxalic aeid. The modified montmorillonite was delaminated at large, as demonstrated by XRD and TEM studies. It can disperse easily in epoxy resin to form exfoliated nanocomp osites. The nanoscale silicate platclets dispersed in water can be metallized by silver deposition.
