Login In
1991 Volume 2 Issue 9
1991, 3(9): 673-674
Abstract:
The reaction of phosphoryl π-allylic palladium species with aldehydes or ketones in the presence of samarium diiodide was carefully studied.
The reaction of phosphoryl π-allylic palladium species with aldehydes or ketones in the presence of samarium diiodide was carefully studied.
1991, 3(9): 675-676
Abstract:
Instead of Br2 and Cl2, NBS and NCS are applicable to the thiocyanation of o-nitroaniline and carbendazim.The results show that NBS and NCS are superior to Br2 and Cl2 due to their easier operation
Instead of Br2 and Cl2, NBS and NCS are applicable to the thiocyanation of o-nitroaniline and carbendazim.The results show that NBS and NCS are superior to Br2 and Cl2 due to their easier operation
1991, 3(9): 677-680
Abstract:
By the condensation of tryptamine with appropriate substituted benzaldehyde followed by Pictet-Spengler reaction, a series of 1-aryl-tetrahydro-β-carbo-lines(THβCs)were obtained.After dehydrogenation using sulfur, Pd-C or lead tetraacetate(LTA), these THβCs can give the corresponding β-carbolines(βCs)which exhibit specific binding with rat brain benzodiazepine receptor in vitro.
By the condensation of tryptamine with appropriate substituted benzaldehyde followed by Pictet-Spengler reaction, a series of 1-aryl-tetrahydro-β-carbo-lines(THβCs)were obtained.After dehydrogenation using sulfur, Pd-C or lead tetraacetate(LTA), these THβCs can give the corresponding β-carbolines(βCs)which exhibit specific binding with rat brain benzodiazepine receptor in vitro.
CHARACTERIZATION OF SOME SCHIFF BASES OF HETEROCYCLIC COMPOUNDS AND THEIR TRANSITION METAL COMPLEXES
1991, 3(9): 681-682
Abstract:
Some new Schiff bases were synthesized by the condensation of equimolar quantities of salicylaldehyde and 2-amino-5-phenylazo-pyridine or its derivatives in dry benzene(1):Metal complexes of the type ML2 and M'L3 where M=Cu2+, Co2+, Ni2+, Mn2+Pd2+, M'=Fe3+ and L=different newly synthesized monobasic Schiff bases were prepared in absolute ethanolic medium(2) and characterized by elementary analysis, conductance measurements, infrared spectra, electronic spectra, magnetic moments studies.
Some new Schiff bases were synthesized by the condensation of equimolar quantities of salicylaldehyde and 2-amino-5-phenylazo-pyridine or its derivatives in dry benzene(1):Metal complexes of the type ML2 and M'L3 where M=Cu2+, Co2+, Ni2+, Mn2+Pd2+, M'=Fe3+ and L=different newly synthesized monobasic Schiff bases were prepared in absolute ethanolic medium(2) and characterized by elementary analysis, conductance measurements, infrared spectra, electronic spectra, magnetic moments studies.
1991, 3(9): 683-684
Abstract:
Using bis(p-methoxyphenyl) telluroxide(BMPTO) as the catalyst, phenylsulphonyl acetonitrile condensed easily with aromatic aldehydes at room temperature to give α-cyano-α, β-unsaturated sulphones in high yields.
Using bis(p-methoxyphenyl) telluroxide(BMPTO) as the catalyst, phenylsulphonyl acetonitrile condensed easily with aromatic aldehydes at room temperature to give α-cyano-α, β-unsaturated sulphones in high yields.
1991, 3(9): 685-686
Abstract:
Two C21-steroids, named amalogenin A amd amaloside A were isolated from the rhizome of Amalocalyx yunnanesis.Their structures were established by analysis on the spectra of NMR including 1H-1H cosy, 13C-1H COSY and confirmed by X-ray diffraction.
Two C21-steroids, named amalogenin A amd amaloside A were isolated from the rhizome of Amalocalyx yunnanesis.Their structures were established by analysis on the spectra of NMR including 1H-1H cosy, 13C-1H COSY and confirmed by X-ray diffraction.
1991, 3(9): 687-688
Abstract:
In the presence of alkali nitrite and carbonate, some nitrobenzenes substituted by strongly electron withdrawing group undergo a self condensation in an aprotic polar sotvent to give symmetrical disubstituted diphenyl ethers in good yields.A possible mechanism is discussed, the nucteophilic aromatic substitution SNAr and SRMAr may occur simultaneously.
In the presence of alkali nitrite and carbonate, some nitrobenzenes substituted by strongly electron withdrawing group undergo a self condensation in an aprotic polar sotvent to give symmetrical disubstituted diphenyl ethers in good yields.A possible mechanism is discussed, the nucteophilic aromatic substitution SNAr and SRMAr may occur simultaneously.
1991, 3(9): 689-690
Abstract:
2-(Chloromethyl)furan as an electrophile attacks lithium trialkylalkynylborates, followed by the oxidation with H2O2 under basic conditions to afford 2-furfurylketones in good yields.
2-(Chloromethyl)furan as an electrophile attacks lithium trialkylalkynylborates, followed by the oxidation with H2O2 under basic conditions to afford 2-furfurylketones in good yields.
1991, 3(9): 691-692
Abstract:
A new guanidine derivative, complanatin has been isolated from the seeds of Chinese traditional medicine Astragalus complanatus R.Br..Its structure was established on the basis of spectral data and X-ray crystallographic analysis to be N-[3-carboxypropyl]-N-[3-methyl-2-butenyl] guanidine.
A new guanidine derivative, complanatin has been isolated from the seeds of Chinese traditional medicine Astragalus complanatus R.Br..Its structure was established on the basis of spectral data and X-ray crystallographic analysis to be N-[3-carboxypropyl]-N-[3-methyl-2-butenyl] guanidine.
1991, 3(9): 693-696
Abstract:
The reaction of LnCl3 with KC9H7(C9H7=indenyl) and K2C8H8 (C8H8=cyclooctatetraene) in tetrahydrofuran (THF) give the corresponding complexes(η5-C9H7) Ln(η8-C8H8)·2THF.The synthesis of(η5-C9H7) Ln(η8-C8H8)·2THF（Ln=Pr, Nd）and crystal structure of (η5-C9H7) Pr(η8-C8H8)·2THF are described.
The reaction of LnCl3 with KC9H7(C9H7=indenyl) and K2C8H8 (C8H8=cyclooctatetraene) in tetrahydrofuran (THF) give the corresponding complexes(η5-C9H7) Ln(η8-C8H8)·2THF.The synthesis of(η5-C9H7) Ln(η8-C8H8)·2THF（Ln=Pr, Nd）and crystal structure of (η5-C9H7) Pr(η8-C8H8)·2THF are described.
1991, 3(9): 697-698
Abstract:
GdCl3 reacts with CH3C6H4Li at a molar ratio of 2:1 in tetrahydyofuran（THF）to yield an interesting compound [Li·4THF][GdCl4·2THF];its X-ray crystal structure shows the molecule to be an ion-pair.
GdCl3 reacts with CH3C6H4Li at a molar ratio of 2:1 in tetrahydyofuran（THF）to yield an interesting compound [Li·4THF][GdCl4·2THF];its X-ray crystal structure shows the molecule to be an ion-pair.
1991, 3(9): 699-700
Abstract:
The title complex [ErY(Gly)6(H2O)4](ClO4)6 5H2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P1.The unit cell parameters are as follows:a=11.518(4), b=14.105(7), c=15.530(6)Å, α=96.61(3), β=102.74(3), γ=105.70(3)°, V=2327.7(17)Å3, Z=2, Dc=2.091g/cm3.The structure has been refined to a final R of 0.0785.The crystal is an infinite chain complex, in which four carboxyl groups from glycine molecules bridge the Er(Ⅲ)and Y(Ⅲ) ion, other two carboxyl groups bridge two adjacent Er(Ⅲ)or two Y(Ⅲ)ions.
The title complex [ErY(Gly)6(H2O)4](ClO4)6 5H2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P1.The unit cell parameters are as follows:a=11.518(4), b=14.105(7), c=15.530(6)Å, α=96.61(3), β=102.74(3), γ=105.70(3)°, V=2327.7(17)Å3, Z=2, Dc=2.091g/cm3.The structure has been refined to a final R of 0.0785.The crystal is an infinite chain complex, in which four carboxyl groups from glycine molecules bridge the Er(Ⅲ)and Y(Ⅲ) ion, other two carboxyl groups bridge two adjacent Er(Ⅲ)or two Y(Ⅲ)ions.
1991, 3(9): 701-702
Abstract:
This paper reports a new chemiluminescence system i.e.luminol-H2O2-IO4- catalyzed by sulphide ion(S2-).Based on this catalysis, a newchemiluminescence（CL）method for the determination of trace S2- is proposed.The detection limit is 0.2μg/L S2-, the linear dynamic range is 5μg to 100βμg/L S2- and the variation coefficient at an sulphide concentration of 10μg/L S2- is 4.5%(n=10).The method has been satisfactory applied to the determination of trace sulphide ion in water.
This paper reports a new chemiluminescence system i.e.luminol-H2O2-IO4- catalyzed by sulphide ion(S2-).Based on this catalysis, a newchemiluminescence（CL）method for the determination of trace S2- is proposed.The detection limit is 0.2μg/L S2-, the linear dynamic range is 5μg to 100βμg/L S2- and the variation coefficient at an sulphide concentration of 10μg/L S2- is 4.5%(n=10).The method has been satisfactory applied to the determination of trace sulphide ion in water.
1991, 3(9): 703-706
Abstract:
A novel molecular probe for identifying properties of supported transition metals and metal oxides catalysts was established.The catalytic mechanism of transition metals was proposed.
A novel molecular probe for identifying properties of supported transition metals and metal oxides catalysts was established.The catalytic mechanism of transition metals was proposed.
1991, 3(9): 707-708
Abstract:
The bimetallic catalysts prepared from SiO2-supported Ru-Co, Ru-Fe and Ru-Mo carbonyl clusters exhibited high yields and selectivities towards oxygenates such as C1-C5 from CO+H2, in contrast to the catalysts prepared from homometallic and bimetallic Ru, Ru-Ni, Ru-Rh, Ru-Mn, and Ru-Cr carbonyl clusters.The FTIR investigation revealed that the 1584 cm-1 species plays an important role in the formation of oxygenates in CO hydrogenation, which is possibly assigned to surface formyl species.
The bimetallic catalysts prepared from SiO2-supported Ru-Co, Ru-Fe and Ru-Mo carbonyl clusters exhibited high yields and selectivities towards oxygenates such as C1-C5 from CO+H2, in contrast to the catalysts prepared from homometallic and bimetallic Ru, Ru-Ni, Ru-Rh, Ru-Mn, and Ru-Cr carbonyl clusters.The FTIR investigation revealed that the 1584 cm-1 species plays an important role in the formation of oxygenates in CO hydrogenation, which is possibly assigned to surface formyl species.
1991, 3(9): 709-710
Abstract:
The fundamental growth thermograms of Bacillus sp.NTT-61 have been determined by microcalorimetric method.From these growth curves we got some thermokinetics data of its growth and its thermodynamic properties.
The fundamental growth thermograms of Bacillus sp.NTT-61 have been determined by microcalorimetric method.From these growth curves we got some thermokinetics data of its growth and its thermodynamic properties.
1991, 3(9): 711-712
Abstract:
The SmF2.01 was synthesized by reducing SmF3 in H2 stream.As it was doped in KMgF3 and KCaF3.there was emission of Sm2+ in KMgF3 but no emission of Sm2+ inKCaF3 was observed.
The SmF2.01 was synthesized by reducing SmF3 in H2 stream.As it was doped in KMgF3 and KCaF3.there was emission of Sm2+ in KMgF3 but no emission of Sm2+ inKCaF3 was observed.
1991, 3(9): 713-716
Abstract:
Lithium ion conducting polymer electrolytes were prepared by blending poly（methyl acrylate）[PMA] with poly（ethylene glycol）[PEG] and coordinating them with LiC104.The highest conductivity was above 1×10-6S/cm at room temperature.
Lithium ion conducting polymer electrolytes were prepared by blending poly（methyl acrylate）[PMA] with poly（ethylene glycol）[PEG] and coordinating them with LiC104.The highest conductivity was above 1×10-6S/cm at room temperature.
1991, 3(9): 717-718
Abstract:
Six new solid complexes of macrocyclic polyether ligand 4'-bromo-5'-nitrobenzo-15-crown-5（L）with trivalent rare earth nitrates having composition of RE（NO3）3·L·mCH3CN·nH2O（RE=La--Nd, m=n=0, RE=Sm, Bu, m=0, 1, n=1, 4）have been synthesized in acetonitrile or acetone.All the isolated complexes have been characterized by elementary analysis, IR and UV spectra, differential thermal and thermogravimetric analysis, X-ray powder diffraction analysis, molar conductance and measurementa of solubility in some general solventa.It shows that coordination number of the rare earth cation in the complexes of La, Ce, Pr and Nd nitrate is eleven.
Six new solid complexes of macrocyclic polyether ligand 4'-bromo-5'-nitrobenzo-15-crown-5（L）with trivalent rare earth nitrates having composition of RE（NO3）3·L·mCH3CN·nH2O（RE=La--Nd, m=n=0, RE=Sm, Bu, m=0, 1, n=1, 4）have been synthesized in acetonitrile or acetone.All the isolated complexes have been characterized by elementary analysis, IR and UV spectra, differential thermal and thermogravimetric analysis, X-ray powder diffraction analysis, molar conductance and measurementa of solubility in some general solventa.It shows that coordination number of the rare earth cation in the complexes of La, Ce, Pr and Nd nitrate is eleven.
1991, 3(9): 719-722
Abstract:
A theoretical equation is developed which describes the response of the current transients to a constant potential at tubular electrodes for a reversible electrode reaction in the flowing fluid.
A theoretical equation is developed which describes the response of the current transients to a constant potential at tubular electrodes for a reversible electrode reaction in the flowing fluid.
1991, 3(9): 723-724
Abstract:
A potentiometric study on the complexes of His, Gly-His, ALa-His, Gly-Gly and Gly-Gly-Gly with Zn（Ⅱ）and Cd（Ⅱ）has been reported.Small-scale potentiometric titrations were carried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm-3（KNO3）.The computer programs SUPERQUAD were applied for data treatment with satisfactory results.
A potentiometric study on the complexes of His, Gly-His, ALa-His, Gly-Gly and Gly-Gly-Gly with Zn（Ⅱ）and Cd（Ⅱ）has been reported.Small-scale potentiometric titrations were carried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm-3（KNO3）.The computer programs SUPERQUAD were applied for data treatment with satisfactory results.
1991, 3(9): 725-726
Abstract:
It has been made certain that thio-and oxy-diacetic acid hydrazides are potential anticancer compounds[1.2].However, their ability to form complexes with transition metals and the properties of the complexes thus formed have not been studied.Employing a new potential anticancer ligand 1, 2-bis（thioacetic acid hydrazide）ethane prepared in our lab, along with ligands oxydiacetic hydrazide and 1, 2-bis（oxyacetic acid hydrazide）ethane, a series of 11 new first-row transition metal(M=Zn2+, Cu2+, Co2+, Ni2+)complexes with each of the above three ligands have been synthesized and characterized by means of elemental analyses, IR, TG and X-ray powder diffraction.
It has been made certain that thio-and oxy-diacetic acid hydrazides are potential anticancer compounds[1.2].However, their ability to form complexes with transition metals and the properties of the complexes thus formed have not been studied.Employing a new potential anticancer ligand 1, 2-bis（thioacetic acid hydrazide）ethane prepared in our lab, along with ligands oxydiacetic hydrazide and 1, 2-bis（oxyacetic acid hydrazide）ethane, a series of 11 new first-row transition metal(M=Zn2+, Cu2+, Co2+, Ni2+)complexes with each of the above three ligands have been synthesized and characterized by means of elemental analyses, IR, TG and X-ray powder diffraction.
1991, 3(9): 727-728
Abstract:
A series of 2-(4'-alkoxyphenyl)-6-substituted henzothiazoles are synthesized in this paper.They are confirmed to be liquid crystals.
A series of 2-(4'-alkoxyphenyl)-6-substituted henzothiazoles are synthesized in this paper.They are confirmed to be liquid crystals.
1991, 3(9): 729-730
Abstract:
A new method is proposed to absorb the NOx into an organic compound, 2-octanol.The absorption efficiency reaches up to 96-99%, and the NOx emission level is decreased from 1.0×104-3.0×105 to 60-680ppm.In the absorption process, 2-octanol is preoxidized.And then it is further oxidized into hexanoic acid with nitric acid.In this way, 20% of nitric acid is saved for the same yield of hexanoic acid.
A new method is proposed to absorb the NOx into an organic compound, 2-octanol.The absorption efficiency reaches up to 96-99%, and the NOx emission level is decreased from 1.0×104-3.0×105 to 60-680ppm.In the absorption process, 2-octanol is preoxidized.And then it is further oxidized into hexanoic acid with nitric acid.In this way, 20% of nitric acid is saved for the same yield of hexanoic acid.
1991, 3(9): 731-734
Abstract:
The electrochemical oxidation behaviors of adrenaline(AD) and its Be(Ⅱ) complex have been studied by voltammetric method with a carbon paste working electrode.On the bases of calculation of the atomic net electronic charges of AD molecule by INDO approximate method and results of comparative experiment with dopamine the possible coordination site of Be(Ⅱ)-AD complex is proposed.
The electrochemical oxidation behaviors of adrenaline(AD) and its Be(Ⅱ) complex have been studied by voltammetric method with a carbon paste working electrode.On the bases of calculation of the atomic net electronic charges of AD molecule by INDO approximate method and results of comparative experiment with dopamine the possible coordination site of Be(Ⅱ)-AD complex is proposed.
1991, 3(9): 735-736
Abstract:
Solid-state cyclic voltammetry was used to study electrochemical behavior of ferroin, which indicates that ferroin performs a reversible redox process in the improved PEO-LiClO4 complex.An activation energy of ca.6.0 Kcal/mol for ferroin diffusion was evaluated from temperature dependence of diffusion coefficient.
Solid-state cyclic voltammetry was used to study electrochemical behavior of ferroin, which indicates that ferroin performs a reversible redox process in the improved PEO-LiClO4 complex.An activation energy of ca.6.0 Kcal/mol for ferroin diffusion was evaluated from temperature dependence of diffusion coefficient.
1991, 3(9): 737-738
Abstract:
A fluoroimmunoassay method using unlabeled Terbium chelate is described.The principle is similar to that of fluoroimmunoassay method using lanthanide chelate as labels.The procedure is simpte because labeling process is unnecessary.The recovery of HSA and albumin in urine is 107% and 95% respectively.The standard deviation is less than 10%.
A fluoroimmunoassay method using unlabeled Terbium chelate is described.The principle is similar to that of fluoroimmunoassay method using lanthanide chelate as labels.The procedure is simpte because labeling process is unnecessary.The recovery of HSA and albumin in urine is 107% and 95% respectively.The standard deviation is less than 10%.
1991, 3(9): 739-740
Abstract:
A novet toughened epoxy resin was obtained by using a precopotymer of epoxy resin and hydroxy-terminated butadiene-acrylonitrile copolymer(HTBN) and amine curing agent.The cured toughened resin has excellent mechanical properties due to the two-phase structure, which has been observed from SEM and TEM.
A novet toughened epoxy resin was obtained by using a precopotymer of epoxy resin and hydroxy-terminated butadiene-acrylonitrile copolymer(HTBN) and amine curing agent.The cured toughened resin has excellent mechanical properties due to the two-phase structure, which has been observed from SEM and TEM.
1991, 3(9): 741-744
Abstract:
The LB film of the title complex was prepared by dropping a benzene solution of the title complex on the surface of water subphase at 25±1℃.The film was deposited in Z type on various hydrophilic pretreated substrates of quartz, CaF2 and electronic conductive glass for different purposes.The π-A curve of the film shows that the cross section per molecule is 125 Å2, which indicates that the alkyl chain of the molecule is basically perpendiculal to the surface of the substrate.UV, IR spectra and transmission electronic microscopy of the film were also obtained.
The LB film of the title complex was prepared by dropping a benzene solution of the title complex on the surface of water subphase at 25±1℃.The film was deposited in Z type on various hydrophilic pretreated substrates of quartz, CaF2 and electronic conductive glass for different purposes.The π-A curve of the film shows that the cross section per molecule is 125 Å2, which indicates that the alkyl chain of the molecule is basically perpendiculal to the surface of the substrate.UV, IR spectra and transmission electronic microscopy of the film were also obtained.
1991, 3(9): 745-748
Abstract:
Nine complexes (RC5H4)2Ti(O2CC6H4X)2 (R=H, CH3;X=H, o-Cl, o-OH, o-NH2, o-NHPh) have been conveniently prepared by the reaction of (RC5H4)2TiCl2 with 2 equiv.sodium salts of corresponding carboxylic acid in aqueous solution containing acetylacetone.The carboxylate ligands in the complexes coordinate to titanium atom in monodentate mode.
Nine complexes (RC5H4)2Ti(O2CC6H4X)2 (R=H, CH3;X=H, o-Cl, o-OH, o-NH2, o-NHPh) have been conveniently prepared by the reaction of (RC5H4)2TiCl2 with 2 equiv.sodium salts of corresponding carboxylic acid in aqueous solution containing acetylacetone.The carboxylate ligands in the complexes coordinate to titanium atom in monodentate mode.
1991, 3(9): 749-750
Abstract:
It was observed that the p-aminobenzoic acid(PABA) molecules adsorbed on Ag2CO3 colloids exhibited strong SERS effect, the enhancement factor is estimated at 107-108 The mechanism of SERS effect on PABA adsorbed on the colloids was discussed.
It was observed that the p-aminobenzoic acid(PABA) molecules adsorbed on Ag2CO3 colloids exhibited strong SERS effect, the enhancement factor is estimated at 107-108 The mechanism of SERS effect on PABA adsorbed on the colloids was discussed.
