期刊文献+
共找到340篇文章
< 1 2 17 >
每页显示 20 50 100
抗炎新药Acetamide45对化合物48/80诱发的皮肤瘙痒的作用机制研究 被引量:1
1
作者 黄育文 吴登唱 +1 位作者 徐翔 陈忠 《中国药房》 CAS CSCD 北大核心 2006年第14期1057-1058,共2页
目的探讨抗炎新药Acetamide45对化合物48/80诱发的皮肤瘙痒的作用机制。方法将ICR小鼠随机分成生理盐水组、模型组(生理盐水+化合物48/80)、美吡拉明阳性对照组及Acetamide450.1、0.3、1、3mg/kg剂量组,背部皮下注射化合物48/80或组胺... 目的探讨抗炎新药Acetamide45对化合物48/80诱发的皮肤瘙痒的作用机制。方法将ICR小鼠随机分成生理盐水组、模型组(生理盐水+化合物48/80)、美吡拉明阳性对照组及Acetamide450.1、0.3、1、3mg/kg剂量组,背部皮下注射化合物48/80或组胺诱发小鼠的瘙痒行为,观察给药前、后小鼠的瘙痒次数。结果与组胺H1受体拮抗药美吡拉明相仿,腹腔内注射Acetamide45不仅可剂量依赖性地抑制由化合物48/80诱发的小鼠瘙痒行为(P<0.05),而且对组胺诱发的瘙痒行为有效(P<0.05)。结论Acetamide45作为一种新型抗炎药,能明显改善化合物48/80诱发的瘙痒行为,其作用可能通过其抑制组胺的释放及阻滞H1受体相关。本研究为Acetamide45早日应用于临床提供了初步证据。 展开更多
关键词 acetamide 45 化合物48/80 组胺 皮肤瘙痒 作用机制
下载PDF
Acetamide-45抑制电场刺激及醋氯甲胆碱引起的离体气道收缩
2
作者 卢韵碧 陈忠 +1 位作者 来晓瑜 高云 《浙江大学学报(医学版)》 CAS CSCD 2005年第2期137-140,共4页
目的探讨新型抗变态反应药N-对氟苄基-3-[(N-4-吡啶)-乙酰胺]-吲哚-45(acetamide-45)对电场刺激引起的大鼠离体气管/支气管收缩,及醋氯甲胆碱引起的豚鼠离体气管收缩的影响。方法以acetamide-45预处理标本后,1记录电场刺激引起胆碱能神... 目的探讨新型抗变态反应药N-对氟苄基-3-[(N-4-吡啶)-乙酰胺]-吲哚-45(acetamide-45)对电场刺激引起的大鼠离体气管/支气管收缩,及醋氯甲胆碱引起的豚鼠离体气管收缩的影响。方法以acetamide-45预处理标本后,1记录电场刺激引起胆碱能神经兴奋所致的标本收缩,观察acetamide-45的作用;2以累积剂量法给予醋氯甲胆碱,观察acetamide-45对醋氯甲胆碱量效曲线的影响,气管张力的变化通过换能器转变为电信号并由记录仪记录。结果Acetamide-45(1~30μmol·L-1)能浓度依赖性地抑制电场刺激引起的大鼠气管/支气管的胆碱能收缩,其在气管的IC50(95%可信限)为10.74(8.87~13.00)μmol·L-1,在支气管的IC50(95%可信限)为18.83(14.57~24.33)μmol·L-1。Acetamide-45浓度依赖地抑制醋氯甲胆碱引起的豚鼠离体气管收缩,3~30μmol·L-1acetamide-45使醋氯甲胆碱的量效曲线的最大效应下降24.6%~43.2%,EC50增大3.1~21.4倍。结论acetamide-45抑制离体气道平滑肌收缩的作用,可能是通过非特异性抑制乙酰胆碱和胆碱能受体结合而产生的。 展开更多
关键词 抗变态反应药/药理学 N-对氟苄基-3-E(N-4-吡啶)-乙酰胺]-吲哚 平滑肌 气管 支气管
下载PDF
Transfer kinetics of phenol between aqueous phase and N,N-di(1-methyl-heptyl) acetamide in kerosene 被引量:2
3
作者 Zhu-xian, Y. Hui-fang, D. +1 位作者 Qi-hong, Z. Zu-ming, Z. 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2000年第2期19-23,共5页
The transfer kinetics of phenol between aqueous phase and N,N di(methyl heptyl) acetaminde (N503) in kerosene has been studied using Lewis cell technique. The effects of the factors including the concentrations of p... The transfer kinetics of phenol between aqueous phase and N,N di(methyl heptyl) acetaminde (N503) in kerosene has been studied using Lewis cell technique. The effects of the factors including the concentrations of phenol in aqueous phase and organic phase, the concentration of N503 in organic phase, the acidity of aqueous phase, the stirring speed and the temperature on the rates of forward and backward extraction of phenol have been examined. The regularity of extraction rate has been obtained. According to experimental results, the rates of both forward and backward extraction of phenol might be controlled by diffusion process. The diffusion step of phenol from aqueous phase to interface for forward extraction and from interface to aqueous phase for backward extraction might be the rate controlling steps. 展开更多
关键词 PHENOL transfer kinetics N N di(1 methyl heptyl) acetamide CLC number: X703 Document code: A Introduction
下载PDF
Synthesis,Crystal Structure and Fluorescent Property of a Lanthanum(Ⅲ) Complex Coordinated with Quinolinyloxy Acetamide Ligand 被引量:1
4
作者 叶行培 蔡红新 +1 位作者 吴伟娜 王元 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第7期1057-1062,共6页
A novel lanthanum(III) complex, [LaL2(NO3)3].H2O (1) based on L (L = N-(na- phthalene-l-yl)-2-(quinolin-8-yloxy)acetamide), was synthesized and characterized by X-ray diffraction. The crystal of I belongs ... A novel lanthanum(III) complex, [LaL2(NO3)3].H2O (1) based on L (L = N-(na- phthalene-l-yl)-2-(quinolin-8-yloxy)acetamide), was synthesized and characterized by X-ray diffraction. The crystal of I belongs to the monoclinic system, space group C2c with Mr= 1017.69, a = 25.1438(17), b = 13.5950(9), c = 18.2349(12) A, β= 132.4980(10)° V= 4595.8(5) A3, Z= 4, Dc = 1.471 Mg/m3, F(000) = 2056,μ= 1.004 mm-1, R = 0,0588 and wR = 0.1402. The central La(lI1) ion is coordinated to four oxygen atoms, two nitrogen atoms from two independent acetarnide ligands and six oxygen atoms from three nitrate anions, possessing a distorted icosahedron coordination geometry. In the crystal of 1, intermolecular N-H……O hydrogen bonds linked the molecules into chains along the c axis. In solid state and CH3CN solution, complex 1 exhibits stronger fluorescent emission than the ligand L. 展开更多
关键词 lanthanum(III) complex acetamide ligand crystal structure fluorescent emission
下载PDF
Electrochemical studies on La-Co alloy film in acetamide-urea-NaBr melt system 被引量:2
5
作者 郭承育 王建朝 +1 位作者 陈必清 王金贵 《中国有色金属学会会刊:英文版》 EI CSCD 2005年第5期1190-1193,共4页
The kinetics of La-Co alloy film in acetamide-urea-NaBr molten salt electrolyte at 353K was investigated. It is shown that the reduction of Co(Ⅱ) to Co is irreversible reaction with the transfer coefficient of 0.28... The kinetics of La-Co alloy film in acetamide-urea-NaBr molten salt electrolyte at 353K was investigated. It is shown that the reduction of Co(Ⅱ) to Co is irreversible reaction with the transfer coefficient of 0.28 and the diffusion coefficient of 7.46×10 -5 cm 2/s. While La(Ⅲ) cannot be reduced to La directly; but can be codeposited with cobalt. The content of La in the uncrystallized La-Co alloy film increases with increasing cathodic overpotential, molar ratio of La 3+ to Co 2+ and electrolysis time as well, and reaches the maximum of 66.32%. 展开更多
关键词 乙酰胺 电化学 稀土元素
下载PDF
Electrochemical Preparation of La-Ni Alloy Film in Acetamide-Urea-NaBr Melting System 被引量:2
6
作者 郭承育 王建朝 +1 位作者 王金贵 陈必清 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第S1期441-444,共4页
The reduction of Ni(Ⅱ) is an irreversible reaction and La(Ⅲ) cannot be reduced to La directly but be co-deposited inductively in the present of Ni(Ⅱ) in the Acetamide-Urea-NaBr molten salt electrolyte at 353 K. The... The reduction of Ni(Ⅱ) is an irreversible reaction and La(Ⅲ) cannot be reduced to La directly but be co-deposited inductively in the present of Ni(Ⅱ) in the Acetamide-Urea-NaBr molten salt electrolyte at 353 K. The uncrystallized alloy film of La-Ni is obtained by potentiostatic electrolysis, and the amount of La grows with increasing cathodic overpotential, molar ratios of La(Ⅲ) to Ni(Ⅱ) and the electrolysis time. The maximum amount of La in alloy film reaches to 78.81% (mass fraction) in present study. 展开更多
关键词 acetamide-urea-NaBr molten salt electrolyte ELECTROREDUCTION inductive co-deposition La-Ni alloy film amorphous alloy rare earth elements
下载PDF
STUDIES ON THE SYNTHESIS AND REACTIONWITH ALKOXIDES OF 3-OXO-1,2-BENZOISOTHIAZOLINE-2-ACETAMIDE1,1-DIOXIDES
7
作者 Guo Feng ZHAO Hua Zbeng YANG(Institute of Elemento-Organic Chemistry Nankai University, Tianjin, 300071) 《Chinese Chemical Letters》 SCIE CAS CSCD 1996年第6期509-510,共2页
New 3 -oxo-benzoisothiazoline-2-acetamide 1, 1-dioxides (IIa-b) ware synthesizedand whose reaction with alkoxides was studied. The reaction results indicated that differentproducts were obtained owing to the different... New 3 -oxo-benzoisothiazoline-2-acetamide 1, 1-dioxides (IIa-b) ware synthesizedand whose reaction with alkoxides was studied. The reaction results indicated that differentproducts were obtained owing to the different time of reaction with alkoxides 展开更多
关键词 OXO OF REACTIONWITH AND ON THE STUDIES acetamide1 ALKOXIDES
下载PDF
VINYL RADICAL POLYMERIZATION INITIATED WITH CERIC ION AND N-(SUBSTITUTED PHENYL) ACETAMIDE SYSTEMS
8
作者 丘坤元 鲁志华 +1 位作者 唐爱军 冯新德 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1992年第4期366-371,共6页
The polymerization of acrylamide (AAM)in H_2O/DMF or in H_2O/CH_3CN mixed solvent initiated with ceric ion (Ce^(4+) )/N-(substituted phenyl)-acetamide systems have been studied. The redox polymerization was revealed b... The polymerization of acrylamide (AAM)in H_2O/DMF or in H_2O/CH_3CN mixed solvent initiated with ceric ion (Ce^(4+) )/N-(substituted phenyl)-acetamide systems have been studied. The redox polymerization was revealed by the low value of overall activation energy (E_α) of AAM polymerization using ceric ion/N-(substituted phenyl) acetamide system as an initiator. The end group of polymer formed was detected by IR spectrum analysis method, it revealed the presence of N-(m-acetoxy-methylphenyl) acetamide (m-AAe) moiety end group in the polymer obtained with ceric ion/m-AAe initiation system. 展开更多
关键词 Ceric ion and N-(substituted phenyl)acetamide initiation systems Acrylamide and acrylonitrile radical polymerization IR spectrum end group analysis
下载PDF
Rate Enhancements in the Acetylation and Benzoylation of Certain Aromatic Compounds with Vilsmeier-Haack Reagents Using Acetamide, Benzamide and Oxychlorides under Non-Conventional Conditions
9
作者 Marri Venkateswarlu Kamatala Chinna Rajanna +3 位作者 Mukka Satish Kumar Utkoor Umesh Kumar Soma Ramgopal Pondichery Kuppuswamy Saiprakash 《International Journal of Organic Chemistry》 2011年第4期233-241,共9页
Acetylation and benzoylation reactions of certain aromatic aldehydes, ketones with Vilsmeier-Haack Re- agents using Acetamide and Oxychloride (SOCl2 or POCl3) under conventional (thermal) and non conven- tional [micro... Acetylation and benzoylation reactions of certain aromatic aldehydes, ketones with Vilsmeier-Haack Re- agents using Acetamide and Oxychloride (SOCl2 or POCl3) under conventional (thermal) and non conven- tional [microwave irradiated (MIR), ultrasonic assisted and solvent free mortar pestle (grinding)] conditions. Reactions afforded good to excellent yields of products with both the VH reagents, reaction times were fairly less in the case of [amide/POCl3] than those of [amide/SOCl2] reagent. Reactions are dramatically acceler- ated in under sonicated and microwave irradiations with a trend: MIR (few seconds) >> Sonication (minutes) > Grinding (min) >> thermal (several hrs). 展开更多
关键词 ACETYLATION BENZOYLATION Vilsmeier-Haack REAGENT (VHR) acetamide BENZAMIDE Micro Wave Irradiation Grinding Sonication
下载PDF
Synthesis and characterization of 2-hydroxy-N-methyl-N-phenyl-acetamide
10
作者 周忠诚 舒万艮 《Journal of Central South University of Technology》 2002年第1期25-29,共5页
2-hydroxy N methyl N phenyl acetamide was synthesized by using N methylaniline, chloracetyl chloride, anhydrous sodium acetate and methanol through the acetylation, esterfication and ester interchange steps. The acety... 2-hydroxy N methyl N phenyl acetamide was synthesized by using N methylaniline, chloracetyl chloride, anhydrous sodium acetate and methanol through the acetylation, esterfication and ester interchange steps. The acetylation of N methylaniline with chloracetyl chloride, catalyzed by triethylamide with mole ratio n (C 6H 5NHCH 3)∶ n (ClCH 2C(O)Cl)∶ n (N(C 2H 5) 3)=1∶1.05∶1, the yield of 2 chloro N methyl N phenyl acetamide(Ⅰ) was 93.8%; Then the esterification of Ⅰ with anhydrous sodium acetate in the presence of phase transfer catalyst tetrabutyl ammonia bromide gave 97.3% yield of 2 acetoxyl N methyl N phenyl acetamide (Ⅱ); The ester interchange of with methanol catalyzed by potassium hydroxide gave 2 hydroxy N methyl N phenyl acetamide (Ⅲ) in 96.4% yield. And the total yield was 88.0%. IR and MS spectroscopy of products were analyzed and their characteristic peaks were assigned. Combining the results of elemental analysis, the molecular structure of Ⅰ, Ⅱ and Ⅲ was identified. 展开更多
关键词 -N-methyl N phenyl acetamide synthesis ACETYLATION esterfication ester interchange characterization
下载PDF
Preparation of Gd-Co alloy film in acetamide-urea-NaBr melt
11
作者 徐常威 潘文杰 +2 位作者 袁定胜 童叶翔 刘冠昆 《中国有色金属学会会刊:英文版》 CSCD 2002年第5期1007-1010,共4页
Electroreduction of Co(Ⅱ) to metallic Co in acetamide-urea-NaBr melt at 353 K is irreversible in one step. Gd(Ⅲ) is not reduced to Gd alone, but can be inductively codeposited with Co(Ⅱ). The amorphous Gd-Co alloy ... Electroreduction of Co(Ⅱ) to metallic Co in acetamide-urea-NaBr melt at 353 K is irreversible in one step. Gd(Ⅲ) is not reduced to Gd alone, but can be inductively codeposited with Co(Ⅱ). The amorphous Gd-Co alloy films were obtained by potentiostatic electrolysis. With the cathode potential shifting to negative direction, the content of gadolinium in the alloy increases and can get to 65.89% (mass fraction). The additive of Na 2EDTA can make the diameter of the particles of crystalline alloy smaller and change the shape of particles. 展开更多
关键词 乙酰胺尿素溴化钠 电解还原 非晶态合金 感应沉积 钆钴合金
下载PDF
A Simple Inexpensive Method for the Measurement of Indoleacetamide Hydrolase Activity
12
作者 Kim Z. Gamburg 《Natural Science》 2017年第4期92-98,共7页
Indole-3-acetic acid (IAA) a phytohormon of auxin type is synthesized by different ways in plants and some bacteria (Agrobacteria, Pseudomonas and some others). The enzyme indolylacetamide hydrolase transforms indolyl... Indole-3-acetic acid (IAA) a phytohormon of auxin type is synthesized by different ways in plants and some bacteria (Agrobacteria, Pseudomonas and some others). The enzyme indolylacetamide hydrolase transforms indolylacetamide to IAA mainly in bacteria. However, recently published data showed that some plants can also hydrolyze indolylacetamide into IAA. In order to elucidate the role of indolylacetamide as an auxin precursor in plants and bacteria, productive method of determination of the activity of indoleacetamide hydrolase is necessary. The simple, inexpensive and productive method for the measurement of indoleacetamide hydrolase activity was elaborated based on significant difference between IAAM and IAA in color developed with Salkovski’ reagent. The light absorbance increased during conversion of IAAM to IAA by protein extracts from some plant cells and this increase may be used for quantitative estimation of indoleacetamide hydrolase activity. The method is suitable for fast discovery of indoleacetamide hydrolase activity before planning more complicated analyses and for the analysis of many probes at a short time in physiological and biochemical experiments. A detailed protocol for determination of indoleacetamide hydrolase activity by the elaborated method is described. 展开更多
关键词 AUXIN Indolyl-3-Acetic Acid Synthesis Indolyl-3-acetamide Indolyl-3-acetamide HYDROLASE Scorzonera hispanica L. DAUCUS SATIVUS (Hoffm.) Roehl. CUCURBITA pepo L
下载PDF
Synthetic Approaches Towards 2-(4-oxo-4, 5-Dihyd ro-Thiazol-2-yl) Acetamide
13
作者 Ali Khalil Shaban Ibrahim Mohamed +2 位作者 Hassan Ahmed Eyada Tarek Ahmed abdel Alaziz Gameel Ahmed Mohamed Mohamed El-Hag Ali 《材料科学与工程(中英文A版)》 2011年第2X期228-235,共8页
关键词 噻唑衍生物 合成方法 氧代 乙酰胺 酰胺化合物 吡啶衍生物 摩尔比 芳香醛
下载PDF
乙酰胺改性13X分子筛的制备及其脱除2-氯戊烷性能
14
作者 任文瑞 周广林 +5 位作者 李汝晗 姜伟丽 王仲戎 李继聪 宣守国 崔玉鑫 《石油炼制与化工》 CAS CSCD 北大核心 2024年第12期13-21,共9页
为解决固体吸附剂13X分子筛对未聚碳五油中2-氯戊烷吸附容量低、吸附成本高的问题,采用浸渍法制备了一系列乙酰胺改性13X分子筛吸附剂,探究其对2-氯戊烷的吸附脱除性能。利用低温氮气吸附-脱附、氨气程序升温脱附、元素分析、傅里叶变... 为解决固体吸附剂13X分子筛对未聚碳五油中2-氯戊烷吸附容量低、吸附成本高的问题,采用浸渍法制备了一系列乙酰胺改性13X分子筛吸附剂,探究其对2-氯戊烷的吸附脱除性能。利用低温氮气吸附-脱附、氨气程序升温脱附、元素分析、傅里叶变换红外光谱等表征手段和分子模拟技术阐明未聚碳五油的脱氯机理,同时测定改性样品对2-氯戊烷的吸附等温线和吸附动力学特性。研究结果表明:改性后13X分子筛的骨架结构未被破坏,新引入的羰基官能团与2-氯戊烷吸附产生了较强的氢键相互作用。当乙酰胺浸渍液浓度为0.75 mol/L时,改性后吸附剂总孔体积、孔径和总酸量最大,对2-氯戊烷的静态吸附容量最高,为107.5 mg/g,吸附过程既存在物理吸附也存在化学吸附。298 K下该改性样品对2-氯戊烷的吸附符合Langmuir等温吸附并且吸附过程符合拟二级动力学模型,吸附平衡常数K_(L)为0.16 L/mg,动力学常数K_(2)为8058.04 g/(mg·h)。 展开更多
关键词 13X分子筛 吸附脱氯 2-氯戊烷 乙酰胺 未聚碳五
下载PDF
N-芳基-2-(2-羟基苄氧基)乙酰芳胺类化合物的合成及其生物活性研究
15
作者 肖湘昭 唐子龙 +2 位作者 林迪 陈哲彦 胡在秋 《精细化工中间体》 CAS 2024年第3期5-9,37,共6页
2-溴乙酰芳胺与水杨醇在碳酸钾的作用下经氧烷基化反应合成了一系列新型N-芳基-2-(2-羟基苄氧基)乙酰胺类化合物2,并用1H NMR、13C NMR等对目标化合物的结构进行了表征。测定了化合物2的离体抑菌活性和抗癌活性,结果表明化合物N-(3-甲... 2-溴乙酰芳胺与水杨醇在碳酸钾的作用下经氧烷基化反应合成了一系列新型N-芳基-2-(2-羟基苄氧基)乙酰胺类化合物2,并用1H NMR、13C NMR等对目标化合物的结构进行了表征。测定了化合物2的离体抑菌活性和抗癌活性,结果表明化合物N-(3-甲基苯基)-2-(2-羟基苄氧基)乙酰胺(2c)和N-(4-氯苯基)-2-(2-羟基苄氧基)乙酰胺(2j)对水稻稻瘟病菌的抑制活性均为91.8%,化合物2c对黄瓜灰霉病菌、菌核病菌的抑制活性分别为88.6%和86.7%。化合物N-(2-甲氧基苯基)-2-(2-羟基苄氧基)乙酰胺(2e)、N-(2-氯苯基)-2-(2-羟基苄氧基)乙酰胺(2h)对肝癌细胞HCCLM3的抑制率为94.2%和92.4%。 展开更多
关键词 酰胺 N-芳基-2-(2-羟基苄氧基)乙酰胺 合成 抑菌活性 抗癌活性
下载PDF
新型吡唑乙酰胺类琥珀酸脱氢酶抑制剂的设计、合成及抑菌活性
16
作者 王晓斌 董雪 +5 位作者 王瑞颖 张娟 王濛琪 张宗群 杨婷玉 许梦寒 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2024年第2期54-62,共9页
为开发出新型杀菌剂候选分子,通过柔性改造吡唑甲酰胺杀菌剂结构中的二元酰胺键得到了一系列潜在靶向真菌琥珀酸脱氢酶(SDH)的新型吡唑乙酰胺分子.借助菌丝生长速率法发现了其中具有广谱抑菌特性的二苯醚联吡唑乙酰胺分子(6l),其在药剂... 为开发出新型杀菌剂候选分子,通过柔性改造吡唑甲酰胺杀菌剂结构中的二元酰胺键得到了一系列潜在靶向真菌琥珀酸脱氢酶(SDH)的新型吡唑乙酰胺分子.借助菌丝生长速率法发现了其中具有广谱抑菌特性的二苯醚联吡唑乙酰胺分子(6l),其在药剂质量浓度为50μg/mL时对水稻纹枯病菌、小麦赤霉病菌和草莓灰霉病菌的抑制效果均优于对照药剂噁霉灵.化合物6l对水稻纹枯病菌的半最大效应浓度(EC_(50)值)为19.92μg/mL,抑菌活性明显优于对照药剂噁霉灵和氟吡菌酰胺(EC_(50)分别为76.74和40.36μg/mL).SDH酶活力测试结果表明,真菌体内的SDH是化合物6l抑制水稻纹枯病菌生长的潜在作用靶标.分子对接研究结果显示,化合物6l分子结构中的二苯醚单元能以多种方式与靶标口袋的关键残基结合,对分子发挥抑菌活性起到了关键作用.研究结果表明,二苯醚联吡唑乙酰胺分子对植物病原真菌具有较显著的抑制作用,在其结构基础上进行深度的优化和改造有望得到可有效防控植物病原真菌的新型杀菌剂候选分子. 展开更多
关键词 抑菌先导发现 吡唑乙酰胺 植物病原真菌 琥珀酸脱氢酶抑制剂
下载PDF
吡拉西坦合成工艺的改进
17
作者 庹仪敏 向莉蓉 +1 位作者 荆一丹 肖子丹 《精细化工中间体》 CAS 2023年第1期39-41,共3页
以α-吡咯烷酮为起始原料,经与甲醇钠反应得到吡咯烷酮钠盐(2),再与氯乙酸甲酯缩合得到吡咯烷酮乙酸甲酯(3),最后经过氨解反应得吡拉西坦(1)。该制备方法三废少、污染小、效率高、收率高,具有工业化应用前景。
关键词 吡拉西坦 乙酰胺吡咯烷酮 Α-吡咯烷酮 吡咯烷酮乙酸甲酯
下载PDF
芳香族液晶聚酯的组成分析
18
作者 肖中鹏 徐显骏 +3 位作者 黄险波 孙华伟 姜苏俊 曹民 《塑料工业》 CAS CSCD 北大核心 2023年第6期87-91,共5页
芳香族液晶聚酯(LCP)难溶于常用溶剂,给其组成分析带来了巨大的挑战。针对这一问题,提出了基于胺解和水解效应的间接分析方法,对LCP的氢氧化钠水溶液(NaOH/H_(2)O)水解产物和乙醇胺(META)胺解产物进行了核磁共振氢谱(^(1)H NMR)表征,对N... 芳香族液晶聚酯(LCP)难溶于常用溶剂,给其组成分析带来了巨大的挑战。针对这一问题,提出了基于胺解和水解效应的间接分析方法,对LCP的氢氧化钠水溶液(NaOH/H_(2)O)水解产物和乙醇胺(META)胺解产物进行了核磁共振氢谱(^(1)H NMR)表征,对N,O-双(三甲基硅基)-乙酰胺(BSTFA)修饰的氢氧化钠/甲醇/二甲基亚砜(NaOH/CH_3OH/DMSO)水解产物进行了^(1)H NMR和气相色谱-质谱(GC-MS)表征。通过对比发现,以NaOH/CH_(3)OH/DMSO为溶剂水解LCP是可将LCP充分单体化的优选溶剂,而采用GC-MS对单体化后的产物进行表征是获得精确单体物质的量比的优选方法,结合两者为LCP组分分析提供了一种高效、准确的方法。此外,表征方式均表明LCP在聚合过程中发生了不期望但无法避免的副反应和反应物升华,进而导致了单体的损失。 展开更多
关键词 液晶聚酯 组成分析 水解 N O-双(三甲基硅基)-乙酰胺修饰 气相色谱-质谱
下载PDF
空心纤维血液透析器中二甲基乙酰胺溶出量的液相色谱测定法
19
作者 肖月丽 杨伟芳 +2 位作者 徐梦瑶 于江晗 赵梦园 《化学推进剂与高分子材料》 CAS 2023年第5期71-74,共4页
建立了空心纤维血液透析器在模拟临床试验的过程中二甲基乙酰胺(DMAC)溶出的测定方法,选择水作为模拟的浸提溶液,采用高效液相色谱法(HPLC)检测DMAC的溶出量,以C18(4.6 mm×250 mm)色谱柱为分析柱,紫外检测器检测波长为200 nm。试... 建立了空心纤维血液透析器在模拟临床试验的过程中二甲基乙酰胺(DMAC)溶出的测定方法,选择水作为模拟的浸提溶液,采用高效液相色谱法(HPLC)检测DMAC的溶出量,以C18(4.6 mm×250 mm)色谱柱为分析柱,紫外检测器检测波长为200 nm。试验结果表明:DMAC在0.5~50 mg/L的线性关系良好(R2=0.999 942),且该试验方法的平均加标回收率为100.7%,检出限为0.05 mg/L。该方法具有测定简单、回收率高、稳定性好、精密度好的优点,能够对DMAC准确的定量,还可用于血液透析器中DMAC溶出量的日常监管检测。 展开更多
关键词 空心纤维血液透析器 二甲基乙酰胺 高效液相色谱
下载PDF
血脂康胶囊中化学成分的研究 被引量:18
20
作者 马学敏 郭树仁 +1 位作者 段震文 王祥云 《中草药》 CAS CSCD 北大核心 2007年第5期650-652,共3页
目的研究血脂康胶囊中的化学成分。方法通过硅胶、Sephadex LH-20柱色谱,结合重结晶技术,从血脂康胶囊中分离得到9个化合物,经理化性质鉴定、波谱解析以及与已知化合物对照,鉴定其结构。结果分别鉴定为脱水莫纳可林K(Ⅰ)、豆甾-5,22-二... 目的研究血脂康胶囊中的化学成分。方法通过硅胶、Sephadex LH-20柱色谱,结合重结晶技术,从血脂康胶囊中分离得到9个化合物,经理化性质鉴定、波谱解析以及与已知化合物对照,鉴定其结构。结果分别鉴定为脱水莫纳可林K(Ⅰ)、豆甾-5,22-二烯-3β-醇(Ⅱ)、莫纳可林K(Ⅲ)、3β-羟基-5α,8β-环二氧麦角甾-6,22-二烯(Ⅴ)、N-[1-(四氢-5-氧代呋喃-2)-乙基]乙酰唑胺(Ⅵ)、大豆苷元(Ⅶ)、黄豆黄素(Ⅷ)、染料木素(Ⅸ)、赤藓醇(Ⅹ)。结论以上化合物除Ⅰ、Ⅲ外,均首次从血脂康胶囊中分离得到。化合物Ⅵ为新的天然产物。 展开更多
关键词 血脂康胶囊 酰胺 氮-[1-(四氢-5-氧代呋喃-2)-乙基]乙酰唑胺
下载PDF
上一页 1 2 17 下一页 到第
使用帮助 返回顶部