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1992 Volume 3 Issue 1
1992, 3(1): 1-2
Abstract:
Carboxymethylpachyman (Ⅰ)was formed by carboxymethylation of β-pachyman.The antitumour activity of carboxymethylpachyman (Ⅰ)against S180、EAC、MA、U14 was measured.The structure of carboxymethylpachyman (Ⅰ)was proved by IR、13CNMR spectroscopy.
Carboxymethylpachyman (Ⅰ)was formed by carboxymethylation of β-pachyman.The antitumour activity of carboxymethylpachyman (Ⅰ)against S180、EAC、MA、U14 was measured.The structure of carboxymethylpachyman (Ⅰ)was proved by IR、13CNMR spectroscopy.
1992, 3(1): 3-4
Abstract:
Euchrcnonc a7 has been prcparcd by condensation of 2-hydroxy-4-mcthoxy-3-prcnylacctophcnone with 2,4-dimethoxymethoxybenzaldehyde followed by cyclization and demethoxymethylation.
Euchrcnonc a7 has been prcparcd by condensation of 2-hydroxy-4-mcthoxy-3-prcnylacctophcnone with 2,4-dimethoxymethoxybenzaldehyde followed by cyclization and demethoxymethylation.
1992, 3(1): 5-8
Abstract:
The phenyl and methyl phenyl free radicals,formed inthe oxidation-hydrolysis process of N'-acyl-N-phenylhydrazine,have been studied by ESR spectrometry.It was found that the free radical is the chief cause which produces the feed-back inhibition effect in the hydrazine-promoted infectious development of silver halide.
The phenyl and methyl phenyl free radicals,formed inthe oxidation-hydrolysis process of N'-acyl-N-phenylhydrazine,have been studied by ESR spectrometry.It was found that the free radical is the chief cause which produces the feed-back inhibition effect in the hydrazine-promoted infectious development of silver halide.
1992, 3(1): 9-10
Abstract:
The reaction of two series of 2,3-dihydro-1,5-henzothiazepines Ⅰ with dichloro-carbene,gave azirino [2,1-d] [1,5]benzothiazepines Ⅷ,azirino [2,1-e] [1,6]benzothiazocines Ⅸ,pyrrolo [2,1-b] [1,3]benzothiazoles Ⅹ,substituted-cyclopropanes Ⅺ and 2H-1,4-benzothiazin-2-ones Ⅻ.The structures of these products were confirmed by the analytical and spectral data.Compound Ⅷ and Ⅸ are two new ring systems.
The reaction of two series of 2,3-dihydro-1,5-henzothiazepines Ⅰ with dichloro-carbene,gave azirino [2,1-d] [1,5]benzothiazepines Ⅷ,azirino [2,1-e] [1,6]benzothiazocines Ⅸ,pyrrolo [2,1-b] [1,3]benzothiazoles Ⅹ,substituted-cyclopropanes Ⅺ and 2H-1,4-benzothiazin-2-ones Ⅻ.The structures of these products were confirmed by the analytical and spectral data.Compound Ⅷ and Ⅸ are two new ring systems.
1992, 3(1): 11-14
Abstract:
Phenylurea reacted with dichlorophenylphosphine and aldehydes or ketones by Mannich-type reaction in anhydrous benzene to give five-mem-bered phosphorous heterocyclic compounds.However.derivatives of α-ureidoalkylphosphonic acids were obtained as the reaction performed in glacial acetic acid.
Phenylurea reacted with dichlorophenylphosphine and aldehydes or ketones by Mannich-type reaction in anhydrous benzene to give five-mem-bered phosphorous heterocyclic compounds.However.derivatives of α-ureidoalkylphosphonic acids were obtained as the reaction performed in glacial acetic acid.
1992, 3(1): 15-18
Abstract:
The precursors I (R'=CH2OTHP,or CO2Et)for (±)-Malabaric acid (1) and(±)-Anisomelol(2)were synthesized from geraniol 3 and homogeranyl iodide 5 (2,6-dimetyl-9-iodo-2,6E-nonadiene) via Wadsworth-Emmons condensation and allylic regioselective chlorination.
The precursors I (R'=CH2OTHP,or CO2Et)for (±)-Malabaric acid (1) and(±)-Anisomelol(2)were synthesized from geraniol 3 and homogeranyl iodide 5 (2,6-dimetyl-9-iodo-2,6E-nonadiene) via Wadsworth-Emmons condensation and allylic regioselective chlorination.
1992, 3(1): 19-22
Abstract:
An improved procedure was used to prepare the asymmetric tripyrrane-containing macrocycles,The yield was over 85% These maerocycles could be oxidized to the methine bridled 22 π electron aromatic cadmium (Ⅱ)complexes by reating with cadmium chloride in the presence of air and their structures were characterized.
An improved procedure was used to prepare the asymmetric tripyrrane-containing macrocycles,The yield was over 85% These maerocycles could be oxidized to the methine bridled 22 π electron aromatic cadmium (Ⅱ)complexes by reating with cadmium chloride in the presence of air and their structures were characterized.
1992, 3(1): 23-24
Abstract:
The reaction of m-dimethoxybenzene with crotonic acid in the presence of PPA affords an unexpected compound,which has been proved to be a dimer by 1H-NMR and MS.The x-ray struc-tural analysis has the same result.The phenomenon has not been reported.
The reaction of m-dimethoxybenzene with crotonic acid in the presence of PPA affords an unexpected compound,which has been proved to be a dimer by 1H-NMR and MS.The x-ray struc-tural analysis has the same result.The phenomenon has not been reported.
1992, 3(1): 25-28
Abstract:
The photochemical [2+2] cycloaddition reaction of carbonyl compunds and alkenes was studied by photochemical induced dynamic nuclear spin polarization.
The photochemical [2+2] cycloaddition reaction of carbonyl compunds and alkenes was studied by photochemical induced dynamic nuclear spin polarization.
1992, 3(1): 29-32
Abstract:
This paper reports the total synthesis of dimethyl 4-hydroxy-4'-methoxy-5,6,5',6'-bismethylenedioxybiphenyl-2,2'-dicarboxylate (Ⅱ).Various conditions for bromination were tried to find the best one for synthesis of the key intermediate compd 6.After Lllmann condensation of 6 with 8 and hydrogenolysis,the title compd Ⅱ was obtained.It was proved to be identical with the isolated metabolite of DDB by spectral data.
This paper reports the total synthesis of dimethyl 4-hydroxy-4'-methoxy-5,6,5',6'-bismethylenedioxybiphenyl-2,2'-dicarboxylate (Ⅱ).Various conditions for bromination were tried to find the best one for synthesis of the key intermediate compd 6.After Lllmann condensation of 6 with 8 and hydrogenolysis,the title compd Ⅱ was obtained.It was proved to be identical with the isolated metabolite of DDB by spectral data.
1992, 3(1): 33-34
Abstract:
Two new afzelechin glycosides,arthromerin A(1)and B(2),have been isolated from the root of Arthromeris mairei (Brause)Ching.Their structur-es were determined by means of their spectral and chemical evidence.
Two new afzelechin glycosides,arthromerin A(1)and B(2),have been isolated from the root of Arthromeris mairei (Brause)Ching.Their structur-es were determined by means of their spectral and chemical evidence.
1992, 3(1): 35-38
Abstract:
The structures of three new eremophilanolides isolated from the roots of Ligularia Veitchiana were shown,by the spectral and chemical evidences,to be 1β,10β-epoxy-6β-hydrox-y-8β-methoxy-eremophil-7 (11)-en-12,8α-olide (3),1β,10β-epoxy-6β-(2' hydroxymethylacryloyloxy)-8β-methoxy-eremophil-7 (11)-en-12,8α-olide (4)and 1β,10β-epoxy-6β-(2'-methoxymethylacryloyloxy)-8β-hydroxy-eremophil-7 (11)-en-12,8α-olide (5).
The structures of three new eremophilanolides isolated from the roots of Ligularia Veitchiana were shown,by the spectral and chemical evidences,to be 1β,10β-epoxy-6β-hydrox-y-8β-methoxy-eremophil-7 (11)-en-12,8α-olide (3),1β,10β-epoxy-6β-(2' hydroxymethylacryloyloxy)-8β-methoxy-eremophil-7 (11)-en-12,8α-olide (4)and 1β,10β-epoxy-6β-(2'-methoxymethylacryloyloxy)-8β-hydroxy-eremophil-7 (11)-en-12,8α-olide (5).
1992, 3(1): 39-42
Abstract:
The electrophilic aromatic substitution reactions have been studied by using the con-cept of pseudo orbital proposed by authors,Because the unoccupied orbitals of electrophilic reagents have been.taken into account,the present results are better than ones given by superdelocalizability,Sr.
The electrophilic aromatic substitution reactions have been studied by using the con-cept of pseudo orbital proposed by authors,Because the unoccupied orbitals of electrophilic reagents have been.taken into account,the present results are better than ones given by superdelocalizability,Sr.
1992, 3(1): 43-46
Abstract:
The electronic structure and spectra of [Mo3O4-nSn]4+ (n=0-4) cations were calculated by means of INDO/CI quantum chemistry method to account for the experimental data of their spectra in water solutions.
The electronic structure and spectra of [Mo3O4-nSn]4+ (n=0-4) cations were calculated by means of INDO/CI quantum chemistry method to account for the experimental data of their spectra in water solutions.
1992, 3(1): 47-50
Abstract:
In Britton-Robinson buffer,metronidazole is preconcentreted on HHDE at 0.0 V( Vs.Ag-AgCI),An adsorptive stripping peak is observed at -0.62 V.The response is linear from 1×10-8 to 1×10-6mol/L with 1.5 min accumulation.The method has been successfully applied to the deterination of metronidazole in human serum and formulations.
In Britton-Robinson buffer,metronidazole is preconcentreted on HHDE at 0.0 V( Vs.Ag-AgCI),An adsorptive stripping peak is observed at -0.62 V.The response is linear from 1×10-8 to 1×10-6mol/L with 1.5 min accumulation.The method has been successfully applied to the deterination of metronidazole in human serum and formulations.
1992, 3(1): 51-52
Abstract:
A new kind of catalyst WOBr4,which can be used in the polymerization of phenylacetylene (PhA),has been synthesized.The obtained polyphenylcetylene (PPhA)using WOBr4 as catalyst is soluble、fusible、with brown-red colour and has 1831 (Mn).The analysis of the stucture of PPhA shows that the polymer has cis-transoidal structure,therefore,the reaction mechanism is via complex catalysis.
A new kind of catalyst WOBr4,which can be used in the polymerization of phenylacetylene (PhA),has been synthesized.The obtained polyphenylcetylene (PPhA)using WOBr4 as catalyst is soluble、fusible、with brown-red colour and has 1831 (Mn).The analysis of the stucture of PPhA shows that the polymer has cis-transoidal structure,therefore,the reaction mechanism is via complex catalysis.
1992, 3(1): 53-56
Abstract:
Phenothiazine and i+s derivatives were oxidized by l2 and 2,2,6,6-tetrametbyl-4-acetyloxypiperidine oxoammonium hexachloroantimonate to the corresponding radical cations in the cavity of β-cyclodextrins in aqueous solution.The mechanism of electron transfer between substrates and oxidants is discussed in terms of association of β-CDs
Phenothiazine and i+s derivatives were oxidized by l2 and 2,2,6,6-tetrametbyl-4-acetyloxypiperidine oxoammonium hexachloroantimonate to the corresponding radical cations in the cavity of β-cyclodextrins in aqueous solution.The mechanism of electron transfer between substrates and oxidants is discussed in terms of association of β-CDs
1992, 3(1): 57-58
Abstract:
The rates of electron exchange between oxidized and reduced forms of sev-eral derivatives of ferrocene (1-3)have been measured in acetonitrile by the NMR line hoadening method at 25℃。It was found that the tes vary with the lengtn of the substitutent chain and the potential of EFe(Ⅲ)/Fe(Ⅱ) in the ferrocene derivatives.
The rates of electron exchange between oxidized and reduced forms of sev-eral derivatives of ferrocene (1-3)have been measured in acetonitrile by the NMR line hoadening method at 25℃。It was found that the tes vary with the lengtn of the substitutent chain and the potential of EFe(Ⅲ)/Fe(Ⅱ) in the ferrocene derivatives.
1992, 3(1): 59-62
Abstract:
By means of improved overlapping Muffin-Tin Xα method recently developed the ground state 2Πand the first excited state 2Σ+ of the XBS+ (X=H,F,Cl) cations are studied.Thecalculated energies are in good agreement with experiment.The ionization potentials of sulphi-doborons,XBS (X=H,F,Cl,Br)are also computed and compared with photoelectron spectra re-sults.
By means of improved overlapping Muffin-Tin Xα method recently developed the ground state 2Πand the first excited state 2Σ+ of the XBS+ (X=H,F,Cl) cations are studied.Thecalculated energies are in good agreement with experiment.The ionization potentials of sulphi-doborons,XBS (X=H,F,Cl,Br)are also computed and compared with photoelectron spectra re-sults.
1992, 3(1): 63-66
Abstract:
Langmuir-Blodgett (LB) films of tetra-nonyl phthalocyanine copper (TNPcCu) were prepared.Molecular arrangement and orientation of these films were studied in detail.LB multilayer films of TNPcCu show a very Strong x-ray diffration peak and two weak peaks which indicate that the LB films form a quasi-crystal structure which molecules are arranged orderly.IR reflection absorption spectra and polarized VIS absorption spectra not only confirm the previous result but also indicate that phthalocyanine rings orient nearly perpendicular to the substrate surface and perpendicular to the lifting direction and the side-chain segments are not preferred oriented.
Langmuir-Blodgett (LB) films of tetra-nonyl phthalocyanine copper (TNPcCu) were prepared.Molecular arrangement and orientation of these films were studied in detail.LB multilayer films of TNPcCu show a very Strong x-ray diffration peak and two weak peaks which indicate that the LB films form a quasi-crystal structure which molecules are arranged orderly.IR reflection absorption spectra and polarized VIS absorption spectra not only confirm the previous result but also indicate that phthalocyanine rings orient nearly perpendicular to the substrate surface and perpendicular to the lifting direction and the side-chain segments are not preferred oriented.
1992, 3(1): 67-68
Abstract:
It is reported in this paper a polarographic catalytic double wave of oxygen reduction caused by diphenylamine compounds (diphs).The electrochemical process of the wave includes the polarographic generation of the superoxide anion O2- and the dismutation of O2- catalyzed by diphs with redox pseudoreversibility.
It is reported in this paper a polarographic catalytic double wave of oxygen reduction caused by diphenylamine compounds (diphs).The electrochemical process of the wave includes the polarographic generation of the superoxide anion O2- and the dismutation of O2- catalyzed by diphs with redox pseudoreversibility.
1992, 3(1): 69-70
Abstract:
In this paper,we report a novel application of microwave radiation for the synthesis of zeolite NaA in a fraction of the time required for conventional synthetic method under very mild condition.The pure product was obtained under the condition of microwave radiation in 10-20 minutes.
In this paper,we report a novel application of microwave radiation for the synthesis of zeolite NaA in a fraction of the time required for conventional synthetic method under very mild condition.The pure product was obtained under the condition of microwave radiation in 10-20 minutes.
1992, 3(1): 71-74
Abstract:
The binding mode and configuration of cisplatin with F-actin were studied on the basis of charge transfer bands of cisplatin-F-actin complex The binding mode was discussed on the basis of the results of LMCT.Raman and fluorescence spectra.
The binding mode and configuration of cisplatin with F-actin were studied on the basis of charge transfer bands of cisplatin-F-actin complex The binding mode was discussed on the basis of the results of LMCT.Raman and fluorescence spectra.
1992, 3(1): 75-76
Abstract:
The inhibitive action of CdSO4 towards corrosion of aluminium in 1 mol/L HCl has been inveetigated by using fluorometrio and weight loss techniques.The results show that the inhibitor exhibits an outstanding function of inhibition,especially at higher tempe-ratures,and it was found to be predomiantly of cathodic rate control.The mechanism of inhibition and the effect of CdSO4 on the corrosion kinetics are also discussed.
The inhibitive action of CdSO4 towards corrosion of aluminium in 1 mol/L HCl has been inveetigated by using fluorometrio and weight loss techniques.The results show that the inhibitor exhibits an outstanding function of inhibition,especially at higher tempe-ratures,and it was found to be predomiantly of cathodic rate control.The mechanism of inhibition and the effect of CdSO4 on the corrosion kinetics are also discussed.
1992, 3(1): 77-78
Abstract:
Precursors of La1-xSrxFeO3 (x=0.0,0.1,0.4 and 0.6) nanocrystalline materials were prepared by the mixed salts dissolved in an aqueous solution of polyvinyl alcohol(PVA).XRD,DTA and TEM were used to characterize the samples.Well-nanocrystalline perovskite-type La1-xSrxFeO3 could be synthesized at the temperatures as low as 400~550℃ for 2h by the calcination of these amorphousprecursors,and the calcination of wet LaFeO3 gel was investigated at 300℃ forlh and 700℃ for 0.5h.
Precursors of La1-xSrxFeO3 (x=0.0,0.1,0.4 and 0.6) nanocrystalline materials were prepared by the mixed salts dissolved in an aqueous solution of polyvinyl alcohol(PVA).XRD,DTA and TEM were used to characterize the samples.Well-nanocrystalline perovskite-type La1-xSrxFeO3 could be synthesized at the temperatures as low as 400~550℃ for 2h by the calcination of these amorphousprecursors,and the calcination of wet LaFeO3 gel was investigated at 300℃ forlh and 700℃ for 0.5h.
