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1994 Volume 11 Issue 5
1994, 44(5): 1-4
Abstract:
A neutral protease from Balilius Subtilis has been immobilized onto the magnetic polymer microspheres,which were obtained from styrene,hydroxyethyl methacrylate,divinyl benzene and Fe3O4,and had hydroxyl groups in the surface by covalent coupling.Themagnetic immobilized neutral protease had a enzyme activity of 1000U/g,enzyme yield of 20~30mg/g carrier,and activity retention of about 40%.For both free enzyme and immobi-lized enzyme the optimum work temperatures were 50℃ and 50~60℃,the optimum pH values were 7.5 and 6.5,and the kinetic constants were 0.054% and 0.088%,respectively.The thermal stability,pH stability,and the storage stability of the immobilized enzyme are improved obviously.
A neutral protease from Balilius Subtilis has been immobilized onto the magnetic polymer microspheres,which were obtained from styrene,hydroxyethyl methacrylate,divinyl benzene and Fe3O4,and had hydroxyl groups in the surface by covalent coupling.Themagnetic immobilized neutral protease had a enzyme activity of 1000U/g,enzyme yield of 20~30mg/g carrier,and activity retention of about 40%.For both free enzyme and immobi-lized enzyme the optimum work temperatures were 50℃ and 50~60℃,the optimum pH values were 7.5 and 6.5,and the kinetic constants were 0.054% and 0.088%,respectively.The thermal stability,pH stability,and the storage stability of the immobilized enzyme are improved obviously.
1994, 44(5): 5-9
Abstract:
The synthesis of propylene/decene-1 copolymer by TiCl4/MgCl2 catalyst and propylene/octene-1 copolymer by δ-TiCl3 catalyst has been investigated.The effects of [Al]/[Ti]ratio,temperature,and concentration of monomers on the copolymerization have been studied.The higher catalysis efficiency,the larger particle size and more porous surface of polymer were observed in copolymerization in comparison with that in homopolymerizationof propylene.The results are discussed in terms of the unsteady diffusion kinetics of the heterogeneous Ziegler-Natta polymerization.
The synthesis of propylene/decene-1 copolymer by TiCl4/MgCl2 catalyst and propylene/octene-1 copolymer by δ-TiCl3 catalyst has been investigated.The effects of [Al]/[Ti]ratio,temperature,and concentration of monomers on the copolymerization have been studied.The higher catalysis efficiency,the larger particle size and more porous surface of polymer were observed in copolymerization in comparison with that in homopolymerizationof propylene.The results are discussed in terms of the unsteady diffusion kinetics of the heterogeneous Ziegler-Natta polymerization.
1994, 44(5): 10-13
Abstract:
The poly (butadiene-b-methyl methacrylate)(PBD-b-PMMA) copolymer has been hydrogenated to form hydrogenated HPBD-b-PMMA copolymer which can be used as a compatibilizer for PVC/LLDPE blends.The results of DMA and FTIR show that HPBD-b-PMMA is an excellent compatibilizer which changed the Tgs of two phases in blends.The hydrogen bonds are considered to be formed between C=O groups of PMMA and H-C-Cl groups of PVC,which weak the interaction between different macromolecules.
The poly (butadiene-b-methyl methacrylate)(PBD-b-PMMA) copolymer has been hydrogenated to form hydrogenated HPBD-b-PMMA copolymer which can be used as a compatibilizer for PVC/LLDPE blends.The results of DMA and FTIR show that HPBD-b-PMMA is an excellent compatibilizer which changed the Tgs of two phases in blends.The hydrogen bonds are considered to be formed between C=O groups of PMMA and H-C-Cl groups of PVC,which weak the interaction between different macromolecules.
1994, 44(5): 14-17
Abstract:
By using Al2O3-supported K2CO3 as a base reagent,the highly selective monoetherification of hydroquinone by alkylating reagents has been carried out in good yield and by simple experimental procedures.A variety of reaction conditions affecting the monoetherification and a probable reaction mechanism were discussed.
By using Al2O3-supported K2CO3 as a base reagent,the highly selective monoetherification of hydroquinone by alkylating reagents has been carried out in good yield and by simple experimental procedures.A variety of reaction conditions affecting the monoetherification and a probable reaction mechanism were discussed.
1994, 44(5): 18-21
Abstract:
Palladium was deposited in lines on the polyimide substrate from coated palladium acetate under Ar+ and He-Ne laser irradiation.The influence of laser power and scan speed on the state of the deposited palladium lines has been examined.The composition of the deposited palladium was analyzed by AES and XPS techniques.The palladium lines showed agood a dhesion on the polyimide substrate.
Palladium was deposited in lines on the polyimide substrate from coated palladium acetate under Ar+ and He-Ne laser irradiation.The influence of laser power and scan speed on the state of the deposited palladium lines has been examined.The composition of the deposited palladium was analyzed by AES and XPS techniques.The palladium lines showed agood a dhesion on the polyimide substrate.
1994, 44(5): 22-26
Abstract:
The crosslinking reaction of glycidyl monoether of 4-[(p-nitrophenyl) azo]phenolwith biuret of hexamethylene diisocyanate has been carried out and investigated by DSC and FTIR techniques.A fully crosslinked nonlinear optical polymer was obtained in a short time,which has a good transparency and maximum absorption wavelength shorter than 400nm.The uniform films formed by spin coating of the THF solution onto transparent substrates were precured for 30 min at 85℃ before corona poling.The orientation and stability of the films were studied by UV-vis spectrum measurement.The orientation of the film decreased to 40% of the original in 4 days after poling for 1.5h at 85℃.However,no relaxation of thepoled film was observed in 4 days after poling and crosslinking for 1h at 140℃.
The crosslinking reaction of glycidyl monoether of 4-[(p-nitrophenyl) azo]phenolwith biuret of hexamethylene diisocyanate has been carried out and investigated by DSC and FTIR techniques.A fully crosslinked nonlinear optical polymer was obtained in a short time,which has a good transparency and maximum absorption wavelength shorter than 400nm.The uniform films formed by spin coating of the THF solution onto transparent substrates were precured for 30 min at 85℃ before corona poling.The orientation and stability of the films were studied by UV-vis spectrum measurement.The orientation of the film decreased to 40% of the original in 4 days after poling for 1.5h at 85℃.However,no relaxation of thepoled film was observed in 4 days after poling and crosslinking for 1h at 140℃.
1994, 44(5): 27-30
Abstract:
The CoTPP showed an effective catalytic activity in electrocarboxylation of benzyl chloride,acetophnone,benzophenone and naphthalene with CO2.The products of electro-carboxvlation were characterized by UV,IR and GC-MS measurements,The mechanisms of the catalvtic electrocarboxylation have been discussed.
The CoTPP showed an effective catalytic activity in electrocarboxylation of benzyl chloride,acetophnone,benzophenone and naphthalene with CO2.The products of electro-carboxvlation were characterized by UV,IR and GC-MS measurements,The mechanisms of the catalvtic electrocarboxylation have been discussed.
1994, 44(5): 31-35
Abstract:
The shake-up peaks are observed on XPS spectra of the coordination complex PAAm-CuCl2 and CuCl2·2H2O and they have a distance to Cu2+2p3/2 shoulder or main peak (ΔEs2=8.7eV or ΔEs=8.6eV) respectively.No shake-up peak in XPS spectrum was found for Cu(Ⅱ)-PVA complex.It is concluded that the coordination bond in PAAm-CuCl2 is formed in result of the acceptance of sp3 hybrid orbitals with the nonpair electrons partially transfered from N of four C-N units of PAAm,whereas in Cu (Ⅱ)-PVA it is formed in result of the acceptance of dsp2 hybrid orbitals with partial transfered nonpair electrons on the side O in four chain units of PVA.The ratio of coordination betvveen Cu2+and PAAm or PVA is thus one to four,as was determined for Cu2+and PAAm by electric conductivity measurement.
The shake-up peaks are observed on XPS spectra of the coordination complex PAAm-CuCl2 and CuCl2·2H2O and they have a distance to Cu2+2p3/2 shoulder or main peak (ΔEs2=8.7eV or ΔEs=8.6eV) respectively.No shake-up peak in XPS spectrum was found for Cu(Ⅱ)-PVA complex.It is concluded that the coordination bond in PAAm-CuCl2 is formed in result of the acceptance of sp3 hybrid orbitals with the nonpair electrons partially transfered from N of four C-N units of PAAm,whereas in Cu (Ⅱ)-PVA it is formed in result of the acceptance of dsp2 hybrid orbitals with partial transfered nonpair electrons on the side O in four chain units of PVA.The ratio of coordination betvveen Cu2+and PAAm or PVA is thus one to four,as was determined for Cu2+and PAAm by electric conductivity measurement.
1994, 44(5): 36-40
Abstract:
The monodispersed ultrafine TiO2 was prepared by the sol-gel method from Ti(OC4H9)4 in C6H6,CCl4 and C2H5OC2H5 respectively.The influences of heat treatment,molar ratio of water to Ti (OC4H9)4,and kinds of solvents have been examined.The spherial monodispersed anatase particles of 7nm and ultrafine tetragonal (40nm×10nm) and spherial (44nm) rutile were obtained.
The monodispersed ultrafine TiO2 was prepared by the sol-gel method from Ti(OC4H9)4 in C6H6,CCl4 and C2H5OC2H5 respectively.The influences of heat treatment,molar ratio of water to Ti (OC4H9)4,and kinds of solvents have been examined.The spherial monodispersed anatase particles of 7nm and ultrafine tetragonal (40nm×10nm) and spherial (44nm) rutile were obtained.
1994, 44(5): 41-44
Abstract:
A series of low molecular weight phenolphthalein epoxy resins (Mn=500~700) have been prepared from phenolphthalein and epichlorohydrin using K2CO3(Na2CO3)/H2O as catalvsts instead of NaOH/H2O.The structures of epoxy resins were characterized by IR and 1H NMR spectra.Theepoxy value (E),number average molecular weight (Mn),and molecular weight distributions of the resins were also measured.The effects of the molar ratios of monomer,contents of the catalyst and water on the reaction have been examined.The results indicated that the low molecular weight phenolphthalein epoxy resins can be obtained in a wide range of molar ratios among phenolphthalein,epichlorohydrin and the catalyst (K2CO3,Na2CO3).
A series of low molecular weight phenolphthalein epoxy resins (Mn=500~700) have been prepared from phenolphthalein and epichlorohydrin using K2CO3(Na2CO3)/H2O as catalvsts instead of NaOH/H2O.The structures of epoxy resins were characterized by IR and 1H NMR spectra.Theepoxy value (E),number average molecular weight (Mn),and molecular weight distributions of the resins were also measured.The effects of the molar ratios of monomer,contents of the catalyst and water on the reaction have been examined.The results indicated that the low molecular weight phenolphthalein epoxy resins can be obtained in a wide range of molar ratios among phenolphthalein,epichlorohydrin and the catalyst (K2CO3,Na2CO3).
1994, 44(5): 45-48
Abstract:
Some bivalent metal ion complexes of Schiff bases derived from formylformic acid and thiosemicarbazide were synthesized.The composition of the complexes were determined as M (HFFTSC)2·nH2O (M=Co(Ⅱ),Ni(Ⅱ),n=2;M=Zn(Ⅱ),n=1;M=Mn(Ⅱ),Pb(Ⅱ),n=0) and Cu (FFTSC)·H2O based on the elemental analysis data and molar conductance measurements.The IR results showed that the ligand behaves as in a tridentate manner.The antibacterial activity of the complexes were examined.
Some bivalent metal ion complexes of Schiff bases derived from formylformic acid and thiosemicarbazide were synthesized.The composition of the complexes were determined as M (HFFTSC)2·nH2O (M=Co(Ⅱ),Ni(Ⅱ),n=2;M=Zn(Ⅱ),n=1;M=Mn(Ⅱ),Pb(Ⅱ),n=0) and Cu (FFTSC)·H2O based on the elemental analysis data and molar conductance measurements.The IR results showed that the ligand behaves as in a tridentate manner.The antibacterial activity of the complexes were examined.
1994, 44(5): 49-53
Abstract:
The chromatographic performance of two bonded stationary phases:3-(ethylene-glycol)-amino propylsilicon (DEAP) and 3-(aza-18-crown-6) propylsilicon (BCP),has been compared through the separation of some polar disubstituted benzene isomerides.The influence of organic solvent content,pH and potassium ion concentration in mobile phase on solute retention behavior has been investigated.The retention mechanism of the solute on various chromatographic systems has been discussed.
The chromatographic performance of two bonded stationary phases:3-(ethylene-glycol)-amino propylsilicon (DEAP) and 3-(aza-18-crown-6) propylsilicon (BCP),has been compared through the separation of some polar disubstituted benzene isomerides.The influence of organic solvent content,pH and potassium ion concentration in mobile phase on solute retention behavior has been investigated.The retention mechanism of the solute on various chromatographic systems has been discussed.
1994, 44(5): 54-59
Abstract:
A back-propagation neural network model has been trained to predict the gas chromatographic retention indices.A group of molecular descriptors which are proposed to represent molecular branching,cyclization and unsaturation has been used as inputted structural parameters.In 300 acyclic and cyclic alkanes,alkenes,alcohols,esters,ketones and ethers studied,the mean relative error of the predicted results was less than 2.83%.
A back-propagation neural network model has been trained to predict the gas chromatographic retention indices.A group of molecular descriptors which are proposed to represent molecular branching,cyclization and unsaturation has been used as inputted structural parameters.In 300 acyclic and cyclic alkanes,alkenes,alcohols,esters,ketones and ethers studied,the mean relative error of the predicted results was less than 2.83%.
1994, 44(5): 60-63
Abstract:
The aqueous sol and the organic sol of SnO2 ultrafine particles (UFP) were pre-pared by the colloid chemistry method;The SnO2 UFP LB films prepared in dodecyl benzenesulfonic sodium (DBS) and stearic acid (SA) have been investigated.The gas sensitivities ofSnO2 UFP and SnO2 were compared.
The aqueous sol and the organic sol of SnO2 ultrafine particles (UFP) were pre-pared by the colloid chemistry method;The SnO2 UFP LB films prepared in dodecyl benzenesulfonic sodium (DBS) and stearic acid (SA) have been investigated.The gas sensitivities ofSnO2 UFP and SnO2 were compared.
1994, 44(5): 64-67
Abstract:
The kinetics of extraction of uranium (Ⅵ) from nitric acid medium by N-octyl-caprolactam (OCLA) in kerosene has been investigated by single drop technique.The extrac-tion rate was found to be of pseudo-first order with respect to the concentration of uranium (Ⅵ) and independent of the extraction temperature.It is suggested that the extraction rateof uranium (Ⅵ) is controlled by the diffusion of UO2(NO3)2·2OCLA from interface intoorganic phase.
The kinetics of extraction of uranium (Ⅵ) from nitric acid medium by N-octyl-caprolactam (OCLA) in kerosene has been investigated by single drop technique.The extrac-tion rate was found to be of pseudo-first order with respect to the concentration of uranium (Ⅵ) and independent of the extraction temperature.It is suggested that the extraction rateof uranium (Ⅵ) is controlled by the diffusion of UO2(NO3)2·2OCLA from interface intoorganic phase.
1994, 44(5): 68-70
Abstract:
The nanometer size SnO2 powder was prepared by the sol-gel chemistry followedby supercritical fluid drying.The XRD,TEM and ASAP have been carried out to analyzethe structure,particle size and surface area of the powder.
The nanometer size SnO2 powder was prepared by the sol-gel chemistry followedby supercritical fluid drying.The XRD,TEM and ASAP have been carried out to analyzethe structure,particle size and surface area of the powder.
1994, 44(5): 71-74
Abstract:
The adsorption of crystal violet on the bentonite has been studied by spectropho-tometry,microelectrophoresis and X-ray diffraction spectroscopy,The results showed that addition of Na-salts obviously improved the adsorption efficiency of Ca-bentonite with crystalviolet solution.
The adsorption of crystal violet on the bentonite has been studied by spectropho-tometry,microelectrophoresis and X-ray diffraction spectroscopy,The results showed that addition of Na-salts obviously improved the adsorption efficiency of Ca-bentonite with crystalviolet solution.
1994, 44(5): 75-78
Abstract:
The wood powder samples were softened at about 300℃ after treatment with a mixture of sulfuric dioxide-diethvlamine-dimethyl sulfoxide (SO2-DEA-DMSO).After esterification with a mixture of pyridine and acetic anhydride the samples showed a softening point of 260℃ and deformation of 70%,these values were 180℃ and 40%,respectively,when a mixture of polyformaldehyde-DMSO was used.The TGA resuIts indicated the decrease in thermostability of the esterified wood powder when it was pretreated by SO2-DEA-DMSO,but not by paraformaldehyde-DMSO,The modified wood powder samples can be molded by hot pressing to give smooth,glossy and semitransparent sheets.
The wood powder samples were softened at about 300℃ after treatment with a mixture of sulfuric dioxide-diethvlamine-dimethyl sulfoxide (SO2-DEA-DMSO).After esterification with a mixture of pyridine and acetic anhydride the samples showed a softening point of 260℃ and deformation of 70%,these values were 180℃ and 40%,respectively,when a mixture of polyformaldehyde-DMSO was used.The TGA resuIts indicated the decrease in thermostability of the esterified wood powder when it was pretreated by SO2-DEA-DMSO,but not by paraformaldehyde-DMSO,The modified wood powder samples can be molded by hot pressing to give smooth,glossy and semitransparent sheets.
1994, 44(5): 79-82
Abstract:
Thirteen title compounds (2) were obtained by nucleophilic addition of benzyl car-banion of 2-aroylamino-5-benzyl-1,3,4-thiadiazoles (1) with anisaldehyde in EtONa/EtOH solution.The structures of the compounds 2 were confirmed by elemental analysis,IR,1H NMR,and MS.The compounds were found to have some fungicidal activity.
Thirteen title compounds (2) were obtained by nucleophilic addition of benzyl car-banion of 2-aroylamino-5-benzyl-1,3,4-thiadiazoles (1) with anisaldehyde in EtONa/EtOH solution.The structures of the compounds 2 were confirmed by elemental analysis,IR,1H NMR,and MS.The compounds were found to have some fungicidal activity.
1994, 44(5): 83-86
Abstract:
systematic study on the redox property of tungstogermanate isomers α- and β-MxHy[GeW9M(H2O)3O37]·nH2O M'=Bu4N+,K+;M=Cr3+,Mn2+,Co2+,Ni2+,Cu2+) was carried out by polarography and voltam metry in aqueous solution.A redox mechanism was proposed and the effects of substituted elements and the structure of anions on the redox property were discussed.The oxidation abilities of the α- and β-isomers were compared.
systematic study on the redox property of tungstogermanate isomers α- and β-MxHy[GeW9M
1994, 44(5): 87-90
Abstract:
The sulfhydryl groups of the reduced glutathione (GSH) have been reacted with2,4-dinitrochlorobenzene to give S-protective glutathione as a hapten,The haptens werecrosslinked with the amino groups on the surface of BSA (Bovine Serum Albumin) glutaraldehyde,The covalent conjugates are GSH specific antigens of high immunogenicity.The antigens were found to be homogenious and have a molecular weight of 87000 dalton asdetermined by gel-electrophoresis method.Spectral and circular dichroism measurementsshowed that the antigens possess special vis-UV spectra,fluorescence nature with aincreased compact of antigen structure.
The sulfhydryl groups of the reduced glutathione (GSH) have been reacted with2,4-dinitrochlorobenzene to give S-protective glutathione as a hapten,The haptens werecrosslinked with the amino groups on the surface of BSA (Bovine Serum Albumin) glutaraldehyde,The covalent conjugates are GSH specific antigens of high immunogenicity.The antigens were found to be homogenious and have a molecular weight of 87000 dalton asdetermined by gel-electrophoresis method.Spectral and circular dichroism measurementsshowed that the antigens possess special vis-UV spectra,fluorescence nature with aincreased compact of antigen structure.
1994, 44(5): 91-94
Abstract:
Three rhodanine color reagents 5-(4'-chloro-2'-carboxylphenylazo)-rhodanine,5-(4'-bromo-2'-carboxylphenylazo)-rhodanine and 5-(4'-iodo-2'-carboxylphenylazo)-rho-danine have been synthesized.The dissociation constants of the color reagents Ka1 and Ka2 aregiven.The color reactions of them with Cu (Ⅱ) are studied.The molar ratio of Cu (Ⅱ) tothe color reagents are found to be 1:2.The Beer's law is obeyed in the range of 0~2.5μg/mL for Cu (Ⅱ).The chloro reagent has been used for copper determination in alloy sam-ples with satisfactory results.
Three rhodanine color reagents 5-(4'-chloro-2'-carboxylphenylazo)-rhodanine,5-(4'-bromo-2'-carboxylphenylazo)-rhodanine and 5-(4'-iodo-2'-carboxylphenylazo)-rho-danine have been synthesized.The dissociation constants of the color reagents Ka1 and Ka2 aregiven.The color reactions of them with Cu (Ⅱ) are studied.The molar ratio of Cu (Ⅱ) tothe color reagents are found to be 1:2.The Beer's law is obeyed in the range of 0~2.5μg/mL for Cu (Ⅱ).The chloro reagent has been used for copper determination in alloy sam-ples with satisfactory results.
1994, 44(5): 95-97
Abstract:
Thermal transitions and liquid crystalline properties of copolyesters based on poly (butyleneterephthalate)(PBT) and p-hydroxybenzoic acid (PHB) were examined by DSC and hot stage polarizing microscopy.The results showed a multi-phase transition associated with PBT-rich domain and PHB-ricli domain in the copolyester.Typical nematic liquidcrystalline phase of the copolyesters appeared when PHB content ranged in 20%~80%。
Thermal transitions and liquid crystalline properties of copolyesters based on poly (butyleneterephthalate)(PBT) and p-hydroxybenzoic acid (PHB) were examined by DSC and hot stage polarizing microscopy.The results showed a multi-phase transition associated with PBT-rich domain and PHB-ricli domain in the copolyester.Typical nematic liquidcrystalline phase of the copolyesters appeared when PHB content ranged in 20%~80%。
1994, 44(5): 98-100
Abstract:
The oleoyl mitomycin C was synthesized by reacting mitomycin C with oleic acid.Its structure was determined by elementary analysis,1H NMR spectra and IR spectra。The liposome of oleoyl mitomycin was prepared by a modified reverse-phase evaporation method.The antitumor assay on mice indicated that this liposome showed 2.2 times more powerful cytotoxicity to human gastric cancer cell line than MMC and very low cytotoxicity to normal human embryonic lung cell line.
The oleoyl mitomycin C was synthesized by reacting mitomycin C with oleic acid.Its structure was determined by elementary analysis,1H NMR spectra and IR spectra。The liposome of oleoyl mitomycin was prepared by a modified reverse-phase evaporation method.The antitumor assay on mice indicated that this liposome showed 2.2 times more powerful cytotoxicity to human gastric cancer cell line than MMC and very low cytotoxicity to normal human embryonic lung cell line.
1994, 44(5): 101-103
Abstract:
The effects of ortho substituents in the benzoyl moiety of benzoylphenylureas are studied by molecular mechanics method.The molecular mechanics caiculation shows that the angle between -CONH- plane and phenyl ring appears to influence the insecticidal activity of benzoylphenylureas.
The effects of ortho substituents in the benzoyl moiety of benzoylphenylureas are studied by molecular mechanics method.The molecular mechanics caiculation shows that the angle between -CONH- plane and phenyl ring appears to influence the insecticidal activity of benzoylphenylureas.
1994, 44(5): 104-106
Abstract:
Methylenedinitramine (1) was synthesized via a new route,N-alkylation of 1 gave a new polynitropolyazatricyclonitramine (2).An improved method for the synthesis of 3,7-dinitro-1,3,5,7-tetraazabicyclo[3.3.1]nonane (3,DPT) from 1 was proposed.
Methylenedinitramine (1) was synthesized via a new route,N-alkylation of 1 gave a new polynitropolyazatricyclonitramine (2).An improved method for the synthesis of 3,7-dinitro-1,3,5,7-tetraazabicyclo[3.3.1]nonane (3,DPT) from 1 was proposed.
1994, 44(5): 107-109
Abstract:
The suitable etching conditions of nylon 1010 have been obtained for scanning electron microscopy observation.The samples have been exposured in formic acid vapor for 40 min at room temperature or at 60~80℃ for 20~40 min.
The suitable etching conditions of nylon 1010 have been obtained for scanning electron microscopy observation.The samples have been exposured in formic acid vapor for 40 min at room temperature or at 60~80℃ for 20~40 min.
1994, 44(5): 110-111
Abstract:
The synthesis of 2,5,7,9-tetrazabicyclo[4.3.0]nonan-8-one hydrochloride (Ⅰ) from ethylenediamine,glyoxal and urea by Mannich reaction is reported.Nitration of the compound (Ⅰ) with nitric acid in acetic anhydride gave the title compound.
The synthesis of 2,5,7,9-tetrazabicyclo[4.3.0]nonan-8-one hydrochloride (Ⅰ) from ethylenediamine,glyoxal and urea by Mannich reaction is reported.Nitration of the compound (Ⅰ) with nitric acid in acetic anhydride gave the title compound.
1994, 44(5): 112-113
Abstract:
The title compound has been synthesized in yield of 68% by reaction of a Vilsmeier reagent with 4-tert-butyl-propiophenone obtained by reaction of propionyl chloride with tert-butylbonzene,which is obtained by reaction of benzene with tert-butyl alcohol.
The title compound has been synthesized in yield of 68% by reaction of a Vilsmeier reagent with 4-tert-butyl-propiophenone obtained by reaction of propionyl chloride with tert-butylbonzene,which is obtained by reaction of benzene with tert-butyl alcohol.
1994, 44(5): 114-115
Abstract:
The red colour of the solution of chinese hawthorn (Crataegus Pinnatifida) has been examined in relation to the pH value,temperature,exposure,presence of cations,organic and inorganic acids,and sugars.
The red colour of the solution of chinese hawthorn (Crataegus Pinnatifida) has been examined in relation to the pH value,temperature,exposure,presence of cations,organic and inorganic acids,and sugars.
