共查询到20条相似文献,搜索用时 15 毫秒
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R.M. El-Shazly 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2009,74(1):259-264
The molecular parameters have been calculated to confirm the geometry of 3-methyl-5-oxo-N,1-diphenyl-4,5-dihydro-1-H-pyrazole-4-carbothioamide, HL. The compound is introduced as a new chelating agent for complexation with Cr(III), Fe(III), Co(II), Ni(II) and Cu(II) ions. The isolated chelates were characterized by partial elemental analyses, magnetic moments, spectra (IR, UV–vis, ESR; 1H NMR) and thermal studies. The protonation constant of HL (5.04) and the stepwise stability constants of its Co(II), Cu(II), Cr(III) and Fe(III) complexes were calculated. The ligand coordinates as a monobasic bidentate through hydroxo and thiol groups in all complexes except Cr(III) which acts as a monobasic monodentate through the enolized carbonyl oxygen. Cr(III) and Fe(III) complexes measured normal magnetic moments; Cu(II) and Co(II) measured subnormal while Ni(II) complex is diamagnetic. The data confirm a high spin and low spin octahedral structures for the Fe(III) and Co(II) complexes. The ESR spectrum of the Cu(II) complex support the binuclear structure. The molecular parameters have also been calculated for the Cu(II) and Fe(III) complexes. The thermal decomposition stages of the complexes confirm the MS to be the residual part. Also, the thermodynamic and kinetic parameters were calculated for some decomposition steps. 相似文献
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ZSM-5分子筛具有极其均匀的孔道结构、 良好的形状选择性和催化活性及耐水热稳定性, 是一种高效、 绿色的固体催化剂, 被广泛应用于石油催化裂化、 精细化工和环境保护等领域. 但其单一的微孔结构大大降低了客体分子的流通扩散性, 导致由大分子参与的芳烃烷基化反应受到极大限制. 本文采用NaOH/四丙基氢氧化铵(TPAOH)混合碱处理微孔ZSM-5, 制备了具备高结晶度、 高比表面积的等级孔微孔-介孔ZSM-5中空分子筛材料, 该材料在保持微孔孔道良好水热稳定性和大量活性中心的同时, 还通过介孔的引入进一步促进反应物及产物的扩散, 使间三甲苯苄基化反应的转化率提高了3.8倍. 通过在等级孔微孔-介孔ZSM-5中空材料上负载Fe, 开发出了具有双功能的等级孔微孔-介孔Fe2O3/ZSM-5中空催化剂, 该催化剂在苯的苄基化反应中表现出优异的催化性能, 当Fe负载量(质量分数)为6.67%, 反应温度为75 ℃, 反应时间为15 min时, 转化率高达98.3%, 选择性为81.6%, 最终收率达到80.2%. 相似文献
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通过浸渍法制备了Fe和Cu含量比不同的系列Fe-Cu/ZSM-5催化剂,利用XRD、H2-TPR、NH3-TPD和原位DRIFTS等技术对催化剂进行了表征,并对其NH3-SCR脱硝性能进行了研究。结果表明,双金属改性的Fe-Cu/ZSM-5催化剂活性温度窗口拓宽,其中,Fe-Cu/ZSM-5 1∶4催化剂脱硝性能优异,250-450℃下脱硝效率均超过90%,335℃时脱硝效率达到最大值96.46%。铜和铁物种能以无定型氧化物良好分散于载体表面,双金属负载改性催化剂保留了ZSM-5的晶体结构。Fe-Cu/ZSM-5 1∶4催化剂具备丰富的酸性位、良好的氧化还原性能,一定温度条件下NH3-SCR反应过程中同时存在E-R机理和L-H机理,且E-R机理反应起始温度低于L-H机理;200℃为催化脱硝反应的起活温度。 相似文献
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De Jiang LI He Qing FU 《中国化学快报》2006,17(5):625-627
1, 3, 4-Oxadiazoline derivatives are found to possess significant biological activities such as antifungal1, insecticidal2, CNS depressant3-5, anticonvulsant effects and plant growth accelerator. They are highly important heterocycles, and have been used … 相似文献
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3—芳基—5—巯基—1,2,4—均三唑的双—Mannich反应研究 总被引:2,自引:1,他引:2
研究了在氯化氢-乙醇溶液中,3-芳基-5-巯基-1,2,4-均三唑与甲醛和伯胺(芳胺或脂肪胺)的双Mannich反应,合成了13的的稠杂环化合物3,5-二取代0四氢均三唑并「3,4-b」「1,3,5」噻二嗪,经元素分析、I手MS确定了结构,初步测定了该类化合物的生物活性。 相似文献
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L. V. Mikhal’chenko M. Yu. Leonova Yu. V. Romanova B. I. Ugrak V. P. Gultyai 《Russian Journal of Electrochemistry》2007,43(10):1183-1186
Polarography and preparative electrolysis are used to show that the electrochemical behavior of 1-ethyl-4-nitro-3-cyanopyrazole (1) in acidic aqueous-alcoholic solutions resembles the behavior of nitrobenzene. By varying the parameters of the electroreduction (ER) of compound 1, one can obtain either 1-ethyl-4-amino-3-cyanopyrazole (2) or 1-ethyl-4-amino-3-cyano-5-chloropyrazole (3). Compound 2 is formed during the ER of compound 1 in the presence of a mediator (titanium(III)) at temperatures below 10°C. Compound 3 is produced by the direct reduction of compound 1 on a lead electrode (30% ethanol, 10% HCl). The yield of amine chlorohydrates 2 and 3 is 56 and 92%, respectively. The mediated ER of compound 1 at catholite temperatures higher than 10°C yields a mixture of compounds 2 and 3; the proportion of the latter increases with temperature to become the major product at 60°C. Compound 3 is formed due to the rearrangement of the hydroxylamine derivative produced by the ER of compound 1, followed by the substitution of chlorine for the hydroxy group. 相似文献
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Davood Nematollahi Adel Ghorbani Amene Amani Hamid Salehzadeh Hadi Beiginejad 《中国化学快报》2013,24(3):205-207
The electrochemical oxidation of 2,5-dihydroxybenzoic acid (1) has been studied in the presence of 1,3-cyclopentadiene (2) as a diene in water/ethanol (40/60, v/v) mixture using cyclic voltammetry and controlled-potential coulometry. A plausible mechanism for the oxidation of 1 in the presence of 2 is presented. Compound 1 was converted into bis-adduct 5 via electrooxidation, Diels-Alder reaction of 2 to anodically generated 3,6-dioxocyclohexa-1,4-dienecarboxylic acid (1ox), decarboxylation reaction, electrooxidation and Diels-Alder reaction. The electrochemical synthesis of 5 was performed in a onepot reaction, without toxic reagents, at a carbon electrode in a simple cell using an environmentally friendly method. 相似文献
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The title compound trans-4-[(5-(2,4-dichlorophenoxy)-3-methyl-1-phenyl-1H-pyra-zol-4-yl)methyleneamino]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one 3 (C28H23Cl2N5O2, Mr = 532.41) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction analysis. It crystallizes in triclinic, space group P1 with a = 8.9438(4), b = 11.6065(5), c = 14.2215(6) , α = 112.566(1), β = 92.324(2), γ = 102.91(1)o, V = 1315.65(10) 3, Z = 2, Dc = 1.344 g/cm3, μ(MoKα) = 0.282 mm-1, λ = 0.71073 , F(000) = 552, the final R = 0.0587 and wR = 0.1578 for 5071 observed reflections (I > 2σ(I)). X-ray analysis reveals that the product is a thermodynamically stable trans isomer. Intra-and intermolecular C(12)-H(12)···O(1) and C(28)-H(28)···O(1)#1 hydrogen bonds were observed in the title compound. 相似文献
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V. N. Bodnar V. N. Britsun M. O. Lozinskii 《Chemistry of Heterocyclic Compounds》2003,39(8):1018-1021
It has been established that interacting ethyl 2-arylhydrazono-4-arylthio-3-oxobutyrates with hydrazine, methylhydrazine, and phenylhydrazine forms 4-arylhydrazono-3-arylthiomethyl-4,5-dihydro-1H-1-R-pyrazolones. 相似文献
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M.-G. A. Shvekhgeimer O. A. Ushakova V. V. Nesterov M. Yu. Antipin 《Chemistry of Heterocyclic Compounds》2005,41(2):181-186
2-Cyanoaryldiazonium bisulfates, obtained by the action of nitrosyl sulfuric acid on isatin 3-hydrazone and its 5-bromo and 5-nitro derivatives, couple with 1-aryl-3-methylpyrazol-5-ones and form 4-arylhydrazones of 1-aryl-3-methylpyrazole-4,5-diones. It was established on the basis of data of IR, UV, and 1H NMR spectra and of X-ray structural analysis that the coupling products exist in the hydrazone form stabilized by an intramolecular hydrogen bond.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 210–215, February, 2005. 相似文献
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Thermal decomposition of copper complexes of 1-phenyl-3-methyl-4-acyl-5-pyrazolone in air atmosphere
Y. Akama 《Journal of Thermal Analysis and Calorimetry》1995,45(6):1501-1506
Copper complexes of some 1-phenyl-3-methyl-4-acyl-5-pyrazolones have been prepared. The complexes were characterized by elemental analyses and thermal analyses. It was shown that the melting points decrease linearly in increasing the molecular weight of the complexes. 相似文献
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Da Qiang Zhang Gao Fei Xu Zhi Jin Fan Dao Quan Wang Xin Ling Yang De Kai Yuan 《中国化学快报》2012,23(6):669-672
In order to investigate the biological activity of novel bis-pyrazole compounds,a series of N-(3-alkyl-5-(N-methylcarbamyl)- 1H-pyrazol-4-yl)-3-alkyl-4-substituted-1H-pyrazole-5-carboxamides were designed and synthesized with ethyl 3-alkyl-1H-pyrazole -5-carboxylate 1 as starting materials.N-Methyl-3-alkyl-4-amino-1H-pyrazole-5-carboxamides 6 were obtained from 1 via 5 steps.3-Alkyl-4-substitued-1H-pyrazole-5-carboxyl chlorides 4a,4b,11a,11b,11c or 12 were also obtained from 1 via several steps.Target compounds 7a-7g were obtained after the reaction of 6 with the above 1H-pyrazole-5-carboxyl chlorides.Preliminary bioassay showed some compounds possessing good inactivation effect against TMV(tobacco mosaic virus).Compound 7a showed higher activity superior to ningnanmycin at a concentration of 5.0×10-4 g/mL and equal activity at 1.0×10-4 g/mL;7b and 7c showed equal activity to virazole both at concentrations of 5.0×10-4 g/mL and 1.0×10-4 g/mL. 相似文献
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1-(2-羟基-3,5-二硝基苯基)-3-[4-(苯基偶氮)苯基]-三氮烯与锌的显色反应及其应用 总被引:5,自引:0,他引:5
研究了 1 (2 羟基 3,5 二硝基苯基 ) 3 [4 (苯基偶氮 )苯基 ] 三氮烯 (HDNPAPT)与锌(Ⅱ )的显色条件。在乳化剂OP存在下的氢氧化钠介质中 ,在 5 2 5nm波长处 ,锌与HDNPAPT形成稳定的 1∶2的红色配合物 ,表观摩尔吸光系数ε52 5=9.15× 10 4 L·mol- 1·cm- 1,锌 (Ⅱ )浓度在 0~ 10 μg/ 2 5ml范围内符合比耳定律。方法已应用于人发、面粉中微量锌的测定 ,结果满意 相似文献