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1993 Volume 4 Issue 1
1993, 4(1): 1-2
Abstract:
4'R, Z, 2-(4'-hydroxy-2'-nonenyl)-1,3-dioxane 2 which is an Intermediate in the synthesis of chiral δ-lactones,has been syntheslzedfrom dlepoxide 3. Enantioselective total synthesis of 6R-(-)-massoialactone 1 has been achieved from 2 through 4 steps
4'R, Z, 2-(4'-hydroxy-2'-nonenyl)-1,3-dioxane 2 which is an Intermediate in the synthesis of chiral δ-lactones,has been syntheslzedfrom dlepoxide 3. Enantioselective total synthesis of 6R-(-)-massoialactone 1 has been achieved from 2 through 4 steps
1993, 4(1): 3-4
Abstract:
The total synthesis of the labeled componed from im mediacetic acid through esterifying, reducing with LiAID4 as a labeling agent, chlerinating and phosphorylating reactions was first reported in this paper.
The total synthesis of the labeled componed from im mediacetic acid through esterifying, reducing with LiAID4 as a labeling agent, chlerinating and phosphorylating reactions was first reported in this paper.
1993, 4(1): 5-8
Abstract:
A series of new 1-aryloxyacetyl-4-aroylthiosemicarbazides were synthesized by means of solid-liguid phase transfer catalysis. The promoting effects of these new compounds on wheat growth were observed.
A series of new 1-aryloxyacetyl-4-aroylthiosemicarbazides were synthesized by means of solid-liguid phase transfer catalysis. The promoting effects of these new compounds on wheat growth were observed.
1993, 4(1): 9-12
Abstract:
Instead of 2-(aroylmethylene)benzimidazolines 3 or 2-(aroyl-methyl)benzimidazoles 4, 4-aryl-2, 3-dihydro-1H-1, 5-benzodiazepin-2-ones 5 were obtained exclusively from the reaction of o-phenylenediamine (1) and ethyl aroylacetates 2 in the presence of a catalytic amount of potassium hydroxide.
Instead of 2-(aroylmethylene)benzimidazolines 3 or 2-(aroyl-methyl)benzimidazoles 4, 4-aryl-2, 3-dihydro-1H-1, 5-benzodiazepin-2-ones 5 were obtained exclusively from the reaction of o-phenylenediamine (1) and ethyl aroylacetates 2 in the presence of a catalytic amount of potassium hydroxide.
1993, 4(1): 13-16
Abstract:
The copper(Ⅰ) catalyzed coupling reaction of substituted propargyl tosylate with propargyl alcohol proceeds smoothly at room temperature to give 2,5-diynyl alcohol under solid-liquid phase transfer condition. A number of 2,5-diynyl alcohols and 2,5,8-triynyl alcohols were synthesized in this way in good yield.
The copper(Ⅰ) catalyzed coupling reaction of substituted propargyl tosylate with propargyl alcohol proceeds smoothly at room temperature to give 2,5-diynyl alcohol under solid-liquid phase transfer condition. A number of 2,5-diynyl alcohols and 2,5,8-triynyl alcohols were synthesized in this way in good yield.
1993, 4(1): 17-18
Abstract:
Low-valent titanium reagent prepared in situ from TiCl4 and Zn was employed to induce the intramolecular coupling of nitro group with carbonyl group to give substituted hydroxyl pyrrolines, pyrroles and lactam in good yields.
Low-valent titanium reagent prepared in situ from TiCl4 and Zn was employed to induce the intramolecular coupling of nitro group with carbonyl group to give substituted hydroxyl pyrrolines, pyrroles and lactam in good yields.
1993, 4(1): 19-20
Abstract:
The introduction of phosphoryi group facilitates the esterification of an amino acid. The corresponding products were isolated and determined.
The introduction of phosphoryi group facilitates the esterification of an amino acid. The corresponding products were isolated and determined.
1993, 4(1): 21-22
Abstract:
Oxidation of alkybenzenes PhCH2R(R=H, CH3, C2H5 and n-C3H7 under 1 atm. of O2 or air catalyzed by iron(Ⅱ, Ⅲ)-2,2'-bipyridine and 1,10-phenanthroline complexes, affords the aryl-substituted ketones and alcohols with the conversion of 15.00%~34.58% containing of 97.60%~99.80% ketones and alcohols. The turnover numbers of these catalysts are over 3500 mol-cat. -1for 3.5 h.
Oxidation of alkybenzenes PhCH2R(R=H, CH3, C2H5 and n-C3H7 under 1 atm. of O2 or air catalyzed by iron(Ⅱ, Ⅲ)-2,2'-bipyridine and 1,10-phenanthroline complexes, affords the aryl-substituted ketones and alcohols with the conversion of 15.00%~34.58% containing of 97.60%~99.80% ketones and alcohols. The turnover numbers of these catalysts are over 3500 mol-cat. -1for 3.5 h.
1993, 4(1): 23-26
Abstract:
The structures of hainanensine derivatives 3, 4A, 4B and 6 have been established by chemical correlation, spectral analysis and X-ray diffraction.
The structures of hainanensine derivatives 3, 4A, 4B and 6 have been established by chemical correlation, spectral analysis and X-ray diffraction.
1993, 4(1): 27-30
Abstract:
Methyl methacrylate was anionically polymerized in the presence of chiral ligands, e.g. (+)-DDB and (-)-Sp. The polymers thus formed were optically inactive due to the instability of the helical chain for the less bulky ester group. Isotactic poly(methyl methacrylate) was given when (+)-DDB was used, whereas, a syndiotactic polymer was formed in the presence of (-)-Sp. Accordingly, two different propagation mechanisms were postulated.
Methyl methacrylate was anionically polymerized in the presence of chiral ligands, e.g. (+)-DDB and (-)-Sp. The polymers thus formed were optically inactive due to the instability of the helical chain for the less bulky ester group. Isotactic poly(methyl methacrylate) was given when (+)-DDB was used, whereas, a syndiotactic polymer was formed in the presence of (-)-Sp. Accordingly, two different propagation mechanisms were postulated.
1993, 4(1): 31-32
Abstract:
A lignan diol (1) was isolated from Schisandra rubriflora Rhed et Wils. It is racemic, with RS, RS, RS, SR configurations for the four consecutive asymmetric centers as shown.
A lignan diol (1) was isolated from Schisandra rubriflora Rhed et Wils. It is racemic, with RS, RS, RS, SR configurations for the four consecutive asymmetric centers as shown.
1993, 4(1): 33-34
Abstract:
Two new cinnamic acid derivatives named biondinin C and biondinin D were isolated from the flower buds of Magnolia biondii pamp. The structures were elucidated by the spectral data including 1H, 1H COSY, 1H-13C COSY spectra.
Two new cinnamic acid derivatives named biondinin C and biondinin D were isolated from the flower buds of Magnolia biondii pamp. The structures were elucidated by the spectral data including 1H, 1H COSY, 1H-13C COSY spectra.
1993, 4(1): 35-36
Abstract:
Four new coumarins named qianhucoumarins A, B, C, D have been isolated from traditional Chinese medicine-the root of Peucedanum praeruptorum. Their structures were elucidated by chemical evidences and spectral analysis.
Four new coumarins named qianhucoumarins A, B, C, D have been isolated from traditional Chinese medicine-the root of Peucedanum praeruptorum. Their structures were elucidated by chemical evidences and spectral analysis.
1993, 4(1): 37-38
Abstract:
Four new compounds named qianhucoumarins E, F, G and baihuaqianhuoside have been isolated from the root of Peucedanum praeruptorum. Their structures were elucidated by chemical evidences and spectral analysis.
Four new compounds named qianhucoumarins E, F, G and baihuaqianhuoside have been isolated from the root of Peucedanum praeruptorum. Their structures were elucidated by chemical evidences and spectral analysis.
1993, 4(1): 39-40
Abstract:
From aerial part of Aster ageratoides, a new natural diterpene glucoside was isolated, Its structure was established by means of spectral and chemical methods as 16β-hydroxy-17-acetoxy-(-)-kauran-19-oic acid-β-D-glucopyranesyl ester.
From aerial part of Aster ageratoides, a new natural diterpene glucoside was isolated, Its structure was established by means of spectral and chemical methods as 16β-hydroxy-17-acetoxy-(-)-kauran-19-oic acid-β-D-glucopyranesyl ester.
1993, 4(1): 41-44
Abstract:
A new catalyst with quaternary ammonium cation activated polyether chains immobilized on silica gel was applied to promote the reations of KI with n-C4H9-Br and KSCH with n-C4H9Br. The new catalyst showed much significant activity over other PEG functionalized silica gel.
A new catalyst with quaternary ammonium cation activated polyether chains immobilized on silica gel was applied to promote the reations of KI with n-C4H9-Br and KSCH with n-C4H9Br. The new catalyst showed much significant activity over other PEG functionalized silica gel.
1993, 4(1): 45-46
Abstract:
A supported Mn-porphyrin catalyst was prepared by adsorption of Mn-porphyrin on active carbon, and found to be efficient for the hydroxylation of hexane with hydrogen peroxide.
A supported Mn-porphyrin catalyst was prepared by adsorption of Mn-porphyrin on active carbon, and found to be efficient for the hydroxylation of hexane with hydrogen peroxide.
1993, 4(1): 47-50
Abstract:
The synthesis and characterization are reported for a series of bi- and trinuclear complexes of the first transition metal ions with PBDETA, the newly synthesized polydentate ligand. The electron transition energy in binuclear compound is stronger than that in trinuclear. There is a weak antiferromagnetic exchange interaction in tricopper and trimanganese.
The synthesis and characterization are reported for a series of bi- and trinuclear complexes of the first transition metal ions with PBDETA, the newly synthesized polydentate ligand. The electron transition energy in binuclear compound is stronger than that in trinuclear. There is a weak antiferromagnetic exchange interaction in tricopper and trimanganese.
1993, 4(1): 51-54
Abstract:
Binuclear Cu(Ⅰ) complex [Cu(dppm)(NO3)]2 (dppm=Ph2PCH2PPh2) and mononuclear Cu(Ⅰ) complex [Cu(dppe)(NO3)] (dppe=Ph2PCH2CH2PPh2) have been synthesized by the ligand-reduction reaction of cupric nitrate with dppm and dppe in methanol and characterized by means of ICP, elemental analyses, molecular weight determination, TG,31P-NMR, IR and Raman spectra; their electronic conductivities and CV waves have also been measured. Results show that dppm coordinates to the Cu(Ⅰ) atoms as a bridging bidentate ligand and dppe as a chelating bidentate ligand, (NO3)-1 behaves as a chelating bidentate ligand in both of the newly prepared complexes.
Binuclear Cu(Ⅰ) complex [Cu(dppm)(NO3)]2 (dppm=Ph2PCH2PPh2) and mononuclear Cu(Ⅰ) complex [Cu(dppe)(NO3)] (dppe=Ph2PCH2CH2PPh2) have been synthesized by the ligand-reduction reaction of cupric nitrate with dppm and dppe in methanol and characterized by means of ICP, elemental analyses, molecular weight determination, TG,31P-NMR, IR and Raman spectra; their electronic conductivities and CV waves have also been measured. Results show that dppm coordinates to the Cu(Ⅰ) atoms as a bridging bidentate ligand and dppe as a chelating bidentate ligand, (NO3)-1 behaves as a chelating bidentate ligand in both of the newly prepared complexes.
1993, 4(1): 55-58
Abstract:
Two binuclear copper(I) complexes with novel structures and novel bonding,Cu2(Ph2PCH2PPh2)Cl2 (Ph2PCH2PPh2=dppm) and Cu2(Ph2P-CH2CH2PPh2)Cl2 (Ph2PCH2CH2PPh2=dppe), were prepared and characterized through elemental analyses, ICP, IR(4000-200 cm-1, CsI disc.), 31P-NMR spectra. Their electronic conductivities, oxidation and reduction potentials were measured. Preliminary studies show that both of the two complexes have chlorobridging and phosphorus-bridging structures.
Two binuclear copper(I) complexes with novel structures and novel bonding,Cu2(Ph2PCH2PPh2)Cl2 (Ph2PCH2PPh2=dppm) and Cu2(Ph2P-CH2CH2PPh2)Cl2 (Ph2PCH2CH2PPh2=dppe), were prepared and characterized through elemental analyses, ICP, IR(4000-200 cm-1, CsI disc.), 31P-NMR spectra. Their electronic conductivities, oxidation and reduction potentials were measured. Preliminary studies show that both of the two complexes have chlorobridging and phosphorus-bridging structures.
1993, 4(1): 59-60
Abstract:
Complex salt Co2Cl5(py)5 (py=pyridine) was obtained by the reaction of CoCl2·6H2O with Bu4NMnO4 in pyridine in the presence of benzoic acid. It is monoclinic and crystallizes in space group P21/n, fw=690.64, a=28.652(5), b=14.108(4), c=7.424(3)Å;β=90.09(1); V=3001(2)Å3; Z=4, Dc=1.53g/cm3. Final R factor is 0.041. The structure consists of a discrete cation [CoⅢCl2(py)4]+ and an anion [CoⅡ Cl3(py)]-. The CoⅢ ion is coordinated by two Cl- and four pyridine nitrogen atoms to form an octahedral geometry, and CoⅡ is coordinated by three Cl- and one pyridine nitrogen atom to form the apices of a tetrahedron. The variable-temperature magnetic susceptility measurement shows no magnet-exchange interaction between CoⅢ and CoⅡ ions.
Complex salt Co2Cl5(py)5 (py=pyridine) was obtained by the reaction of CoCl2·6H2O with Bu4NMnO4 in pyridine in the presence of benzoic acid. It is monoclinic and crystallizes in space group P21/n, fw=690.64, a=28.652(5), b=14.108(4), c=7.424(3)Å;β=90.09(1); V=3001(2)Å3; Z=4, Dc=1.53g/cm3. Final R factor is 0.041. The structure consists of a discrete cation [CoⅢCl2(py)4]+ and an anion [CoⅡ Cl3(py)]-. The CoⅢ ion is coordinated by two Cl- and four pyridine nitrogen atoms to form an octahedral geometry, and CoⅡ is coordinated by three Cl- and one pyridine nitrogen atom to form the apices of a tetrahedron. The variable-temperature magnetic susceptility measurement shows no magnet-exchange interaction between CoⅢ and CoⅡ ions.
1993, 4(1): 61-62
Abstract:
A novel macrocycle containing thiophene (L) was prepared first by the interaction of 2,5-bis-(chloromethyl)-thiophene (A) and salicylaldehyde to give 2, 5-bis-(2-formylphenoxymethyl)-thiophene (B), and then by the nontemplate cyclocondensation of 1,3-diaminopropane with (B) followed by a "onepot" reduction without isolation of the diimine intermediate. The corresponding silver complex, AgLClO4, was also prepared. The macrocycle was characterized by IR, elemental analysis, MS and 1HNMR
A novel macrocycle containing thiophene (L) was prepared first by the interaction of 2,5-bis-(chloromethyl)-thiophene (A) and salicylaldehyde to give 2, 5-bis-(2-formylphenoxymethyl)-thiophene (B), and then by the nontemplate cyclocondensation of 1,3-diaminopropane with (B) followed by a "onepot" reduction without isolation of the diimine intermediate. The corresponding silver complex, AgLClO4, was also prepared. The macrocycle was characterized by IR, elemental analysis, MS and 1HNMR
1993, 4(1): 63-66
Abstract:
The surface pressure—area isotherms(π—A curves) of 2—heptadecyl imidazole (HIM) Langmuir films at the subphases of deionized water and solutions containing metal ions such as Cu2+, Cd2+, Ca2+, Co2+, Ag+ etc. have been studied. It was formed Langmuir film at the subphase containing Cu2+ or Ag+ ions and its LB film was successfully deposited. The molecular and ionic total energies (E) and stabil. ity energies (△E) forming complexes were computed by CNDO/2 method. The computational results agreed with the experiments.
The surface pressure—area isotherms(π—A curves) of 2—heptadecyl imidazole (HIM) Langmuir films at the subphases of deionized water and solutions containing metal ions such as Cu2+, Cd2+, Ca2+, Co2+, Ag+ etc. have been studied. It was formed Langmuir film at the subphase containing Cu2+ or Ag+ ions and its LB film was successfully deposited. The molecular and ionic total energies (E) and stabil. ity energies (△E) forming complexes were computed by CNDO/2 method. The computational results agreed with the experiments.
1993, 4(1): 67-68
Abstract:
The effect of coking amount for diffusion rate of m—xylene in a pore of the modified ZnZSM—5 aromatization catalyst has been studied.
The effect of coking amount for diffusion rate of m—xylene in a pore of the modified ZnZSM—5 aromatization catalyst has been studied.
1993, 4(1): 69-70
Abstract:
The SERS spectrum of C60 was obtained by using silver mirror. From the SERS spectrum of C60 and the IR spectrum of C60, we proposed that C60 adsorbed on the silver mirror adopts a more ellipsoidal shape.
The SERS spectrum of C60 was obtained by using silver mirror. From the SERS spectrum of C60 and the IR spectrum of C60, we proposed that C60 adsorbed on the silver mirror adopts a more ellipsoidal shape.
1993, 4(1): 71-72
Abstract:
A new reagent,1(4 antipyriny1) 3 (2,4-dinitropheny1)triazene(APDNBT), was synthesized in this lab and its analytical properties and its colour reaction with cadmium were studied.
A new reagent,1(4 antipyriny1) 3 (2,4-dinitropheny1)triazene(APDNBT), was synthesized in this lab and its analytical properties and its colour reaction with cadmium were studied.
1993, 4(1): 73-74
Abstract:
This letter presents ab initio calculation of Captodative effect on 2,2,2-trifluoroethylamine free radical on STO-3G level. The △Ecd is -50. 15 kJ/mol, which means that this radical is of extra stabilization energy.
This letter presents ab initio calculation of Captodative effect on 2,2,2-trifluoroethylamine free radical on STO-3G level. The △Ecd is -50. 15 kJ/mol, which means that this radical is of extra stabilization energy.
1993, 4(1): 75-78
Abstract:
The geometries and vibrational frequencies of the ground and low-lying excited states for B3, B3- and B3+ are determined with the energy gradient method using the polarized double-zeta(6-31G*) basis set. The stabilities for the states of B3,B3- and B3+ have been investigated based on the vibrational analysis. The correlation energy obtained for each state is considered with the configuration interaction (CISD+Q) technique. B3 and B3+ have stable equilateral triangle geometry, while B3- has stable equilateral triangle, isosceles triangle and linear geometries. The Jahn-Teller distortion for a 3E' state of B3- in D3h symmetry is also discussed.
The geometries and vibrational frequencies of the ground and low-lying excited states for B3, B3- and B3+ are determined with the energy gradient method using the polarized double-zeta(6-31G*) basis set. The stabilities for the states of B3,B3- and B3+ have been investigated based on the vibrational analysis. The correlation energy obtained for each state is considered with the configuration interaction (CISD+Q) technique. B3 and B3+ have stable equilateral triangle geometry, while B3- has stable equilateral triangle, isosceles triangle and linear geometries. The Jahn-Teller distortion for a 3E' state of B3- in D3h symmetry is also discussed.
1993, 4(1): 79-82
Abstract:
The preparation, characterization and properties of titania overlayer on Fe(110) substrate is hereby reported. The TiOX overlayer was found to form in a layer-by-layer mode with a suboxide of titanium in the form of TiO migrating into the Fe substrate and Fe migrating into the deposited layer of TiOX simultaneously during the deposition.
The preparation, characterization and properties of titania overlayer on Fe(110) substrate is hereby reported. The TiOX overlayer was found to form in a layer-by-layer mode with a suboxide of titanium in the form of TiO migrating into the Fe substrate and Fe migrating into the deposited layer of TiOX simultaneously during the deposition.
1993, 4(1): 83-86
Abstract:
Photocurrent transients on stainless steel in the passive and transpassive regions in 0.5M H2SO4 were obtained using weak signal detecting technique. In passive region, the photoresponse an stainless steel exhibits n-type semiconductor characteristics. While changing from the passive to transpassive region, a n-p type transformation happens. This phenomenon is possibly caused by the change of the composition of passive film of stainless steel.
Photocurrent transients on stainless steel in the passive and transpassive regions in 0.5M H2SO4 were obtained using weak signal detecting technique. In passive region, the photoresponse an stainless steel exhibits n-type semiconductor characteristics. While changing from the passive to transpassive region, a n-p type transformation happens. This phenomenon is possibly caused by the change of the composition of passive film of stainless steel.
1993, 4(1): 87-88
Abstract:
The Langmuir-Blodgett (LB) technique was used for the first time to study inhibition mechanism. Stearic acid Langmuir-Blodgett (SALB) monolayers showed a good inhibition effect on iron corrosion in neutral environment and the inhibition is mainly based on the blocking effect.
The Langmuir-Blodgett (LB) technique was used for the first time to study inhibition mechanism. Stearic acid Langmuir-Blodgett (SALB) monolayers showed a good inhibition effect on iron corrosion in neutral environment and the inhibition is mainly based on the blocking effect.
1993, 4(1): 89-92
Abstract:
The black patina on some ancient Chinese bronze mirrors is known as " Black Lacquer Antique "(BLA) or "Hei-qi-qu", which looks jet-black and shiny. BLA's were corroded slowly, one of them was about 10-4mm per year in the soil. Many scholars have studied the composition and structure of BLA(1)(2)(3)(4), but the formation remains obscure. In this paper the formation of BLA on the surface of bronze mirror samples induced by humic acids under different conditions has been studied.
The black patina on some ancient Chinese bronze mirrors is known as " Black Lacquer Antique "(BLA) or "Hei-qi-qu", which looks jet-black and shiny. BLA's were corroded slowly, one of them was about 10-4mm per year in the soil. Many scholars have studied the composition and structure of BLA(1)(2)(3)(4), but the formation remains obscure. In this paper the formation of BLA on the surface of bronze mirror samples induced by humic acids under different conditions has been studied.
1993, 4(1): 93-94
Abstract:
The ground state and three low-lying states of the H3+ are determined by SOCI(Second Order Configuration Interaction) calculations. The results indicate that the 3Σu+ state of H3+ is a bound state, but 1A1 and 3A1 states are not stable, each of them will dissociate into H2+ and H atom. The SOCI energy -1.1144065au at an equidistant nuclear separation of 1.296A is in good agreement with the lowest value reported so far[1].
The ground state and three low-lying states of the H3+ are determined by SOCI(Second Order Configuration Interaction) calculations. The results indicate that the 3Σu+ state of H3+ is a bound state, but 1A1 and 3A1 states are not stable, each of them will dissociate into H2+ and H atom. The SOCI energy -1.1144065au at an equidistant nuclear separation of 1.296A is in good agreement with the lowest value reported so far[1].
