缩合
- condensation
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B环取代基对黄酮类化合物缩合、关环的影响
The Substituting Groups of B Ring Affecting the Condensation and Closing Ring
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DNA体外缩合的研究进展
Advances in the Study of DNA Condensation in Vitro
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话题触及国防,缩合字,缩写字和行话就满天飞
Scratch the subject of defence and acronyms , abbreviations , and buzzwords fly out .
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邻甲酚酞甲醛缩合物及其纤维素膜的pH敏感性
O-cresolphthalein-formaldehyde polymer immobilized cellulose membrane and its pH sensitivity
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化学法合成维生素E基本都采用异植物醇与2,3,5-三甲基氢醌经缩合、酯化反应来合成。
Absract : Isophytol and2,3,5-trimethylhydroquinone are basic raw materials in the chemical synthesis of Vitamin E.
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维生素K1缩合反应进展
Progress in vitamin K _1 synthesis
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FTIR图谱解析表明硅/磷溶胶与纤维上的羟基发生缩合。
FTIR suggested that Si-P sol had reacted with hydroxyl of fibers .
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KF/Al2O3催化柠檬醛和丙酮缩合制备假性紫罗兰酮
Synthesis of Pseudo-ionone by Condensation of Citral with Acetone in presence of KF / Al_5O_3
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影响贮存稳定性的因素有酸性合成阶段反应物的配比、最终产品的pH值、缩合度等。
Factors affected the storage stability include ratio of the reactants , pH value of the end products and degree of condensation .
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ADC生产中缩合废水的氨氮处理工艺
Ammonia-nitrogen treatment process of condensed wastewater in ADC production
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合成了由水杨醛和赖氨酸缩合的新的氨基酸schiff碱配体以及它的镧系元素配合物。
A new lysine-salicylaldehyde schiff-base and its lanthanide complexes are prepared .
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研究了以固体Ba(OH)2作为催化剂,使柠檬醛与丙酮醛醇缩合反应制备假紫罗酮的方法。
Using solid barium hydroxide as catalyst , a preparation method of pseudoionone from citral and acetone has been studied .
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NF脂肪族系高效减水剂系是以丙酮、甲醛为主要原料,辅以适量磺化剂、引发剂,在一定反应条件下合成的新型高性能减水剂,是一种羟基磺酸盐高缩合物。
NF acyclic superplasticizer has been made mainly of acetone and formaldehyde under certain reaction conditions .
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缩合反应时间为2h;二嗪磷缩合工艺的改进
Condensation time is 2 hours ; Improving Condensation of Diazinon
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气相羟醛缩合法制MA及MMA研究进展
Progress in the Research on Vapor-phase Aldol Condensation to MA and MMA
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尿素在银电极表面上吸附及缩合反应的SERS研究
SERS Study of Adsorption and Condensation Reaction of Urea on Silver Electrode
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对用MQ硅树脂增强缩合型双组分室温硫化硅橡胶进行了研究。
MQ silicone resins was used to reinforce two component RTV silicone rubbers of condensation-curing type .
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本文利用GC-MS对苯胺与丙酮缩合反应的产物进行了结构分析。
The present research analyzed the structure of the condensation products of aniline with acetone by GC-MS.
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在本课题的研究中,通过硅烷偶联剂与硅溶胶颗粒表面硅羟基缩合的方法,制备了改性的纳米SiO2。
Modified SiO2 nanoparticles were synthesized by condensation of OH group of silica and the coupling agent .
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以苯酚、甲醛为原料,以磷酸为催化剂,无溶剂条件下经酚醛缩合合成了双酚F。
The bisphenol F was synthesized by condensation reaction using phosphoric acid as catalyst , phenol and formaldehyde as feed stock under the non-solvent condition .
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选用W酸作为催化剂能够缩短反应时间、降低缩合反应温度、提高促进剂M的纯度;
W acid catalyst used in Salicylic acid catalyst can shorten reaction time , decrease reaction temperature and increase the purity of crude accelerator M.
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根据FTIR测定结果,推测在反应中可能发生酮与酸酐的缩合反应。
It was deduced from FTIR that the condensation reaction was caused by a reaction of ketone group with anhydride .
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对烷氧基硅烷的sol-gel反应过程,特别是起始的水解和初步缩合过程已有较多的研究。
Among such researches , there has been much exploration on the sol-gel reaction kinetics , especially the hydrolysis and initial condensation processes .
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SiO2负载磷钨酸(盐)催化剂对乙酰乙酸乙酯与乙二醇缩合反应的催化性能
Catalytic Performance of Phosphotungstic Acid ( Salt ) Supported on SiO_2 for Acetalization of Ethyl Acetoacetate with Glycol
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在氟化钾催化下,芳香醛与氰乙酸乙酯发生羰基与活性亚甲基的缩合反应,高收率地得到缩合产物,且只得到E式产物。
The carbonyl methylene condensation reaction of aromatic aldehydes with ethyl cyanoacetate has been carried out smoothly in the presence of potassium fluoride only giving E isomers in high yield .
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高能注射法制备MO(N)/γ-Al2O3催化剂用于苯胺气相缩合生成二苯胺的研究
Study on the Catalyst of Mo ( N ) / γ - A1_2O_3 Prepared by High Energy Injection for the Vapor - phase Condensation of Aniline to Diphenylamine
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利用质谱分析结果结合量子化学ABINITIO方法,研究甲醇缩合脱水的反应过程。
Mass Spectrometry and quantum chemistry ab initio method have been used to study the reactivity of the methanol dehydration .
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固体碱催化丙酮Aldol缩合反应
The Aldol Condensation of Acetone on a Solid Alkaline Catalyst
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缩合温度110℃,缩合时间6h,pH≈3.0,明胶用量为废糖蜜重量的0.6%。
Condensation temperature is 110 ℃, the time is 6h , the acidity pH ≈ 3.0 , and the amount of the gelatin 0.6 % .
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结果表明,与硫酸盐浆(KP)相比,碱性&亚钠法浆(ASP)中残余木素含有较少的缩合型结构以及木素与半纤维素的连接;
Results showed that the condensed structure and the connection between lignin and semi-cellulose in ASP were less than those in KP .