碱性反应

The genera formulas of these compounds are as follows:The strobilurin derivatives were synthesized from substitutedβ-keto esters (2) as starting material which were prepared from substituted ketones (1) and dimethyl carbonate. The ester (2) and methyl hydrazine or substituted amidine were dissolved in methanol and the mixture was heated to reflux to obtain the substituted 5-hydroxy-1H-pyrazole (3) or 4-hydroxy-pyrimidine (4). The title compounds were prepared by reacting the intermediates (3 and 4) with substituted halomethylphenyls which contain four active group under basic conditions.

本论文所合成的strobilurin化合物均是以β-酮酸酯类化合物(2)为起始原料合成的，该中间体(2)是由酮类化合物(1)与碳酸二甲酯在碱性条件下反应生成的，中间体(2)与甲基肼或取代脒类化合物在甲醇中回流制得取代的1H-5-羟基吡唑(3)或4-羟基嘧啶(4)，中间体(3和4)再与包含四种活性基的苄卤中间体在碱性条件下制得目标化合物。

An aminobenzene sulfonate-formaldehyde based polymer dispersant with good grinding efficiency was synthesized under alkaline condition using aminobenzene sulfonate, phenol and formaldehyde as main raw materials.

以对氨基苯磺酸、苯酚、甲醛为主要原料，采用碱性合成线路制备了具有助磨效果的氨基磺酸系高效减水剂，系统地研究了单体比例、单体浓度、交联剂用量、反应体系初始pH值、反应时间和反应温度等因素对助剂助磨效果的影响。

The possible mechanism for the two ECL channels at the Pt electrode cathodically pre-polarized in alkaline solution is also proposed:(1) luminol anion was electroxidized to radical at 0.22V, which then reacted with the oxygen dissolved in solution and emitted light;(2) the fresh oxygen species electro- generated at 1.07V oxidized luminol anion with light emission.

同时给出了在碱性含氧溶液中预还原的铂电极上两个可能的ECL反应通道：(1)在0.22V鲁米诺阴离子氧化为鲁米诺自由基，然后与溶解氧反应而发光；(2)1.07V处析出的新鲜氧与鲁米诺阴离子反应而发光。

Knoevenagel condensation reaction of aromatic aldehydes with active methylene compounds like ethyl cyanoacetate proceeds smoothly in water in the presence of 8mol% of diammonium hydrogen phosphate and 2mol% TEBA.

醛与活泼亚甲基化合物的 Knoevenagel 反应是有机合成中广泛应用的形成碳碳键的重要方法，该反应一般是弱碱性催化剂存在下完成的，如各类胺、脲[1]等，Lerwis酸[2]、杂多酸[3]、氨基酸[4]等也可用于催化该反应。

The related reaction conditions and factors such as catalysis of some catalysts etc were discussed. In the procedures, 2-pentylidene cyclopentanone intermediate, which could be isomerizated into a 2-pentyl cyclopentenone under acidic conditions, was effectively prepared in the presence of a phase transfer promotor.

讨论了正戊醛和环戊酮在碱性条件下缩合生成2-亚戊基环戊酮的反应温度、碱浓度、相转移催化剂等因素对反应的影响。2-亚戊基环戊酮中间体化合物能在酸催化剂作用下，异构成2-戊基环戊烯酮，其中酸浓度和溶剂等参数对反应影响明显。

In the second part of the thesis, we discussed a L-proline-catalyzed direct Aldol reaction between L-amino acid-derived N,N-dibenzyl -amino aldehydes 15 and acetone, cyclopentanone or hydroxyacetone, which afforded (-amino--hydroxy- or (-amino-,(-dihydroxy-ketones in good to excellent yields (up to 94%) and diastereoseletivities (up to 94.9%).

发现许多情况下，反应的产率和de值超过90%。接着，在碱性条件下，我们将L-亮氨酸衍生的N，N-二苄基--氨基醛15g与羟基丙酮反应得到的主要产物(，-二羟基-γ-氨基酮171d与次溴酸钠反应，得到了具有抗肿瘤活性的天然产物PM-94128的氨基酸片断184。

OBJECTIVE: To compare the differences of gene expression and the response to bFGF of human umbilical cord CD34+ and CD133+ cells, and to explore gene expression changes of bFGF-induced umbilical cord CD34+ and CD133+ hematopotic stem cells/hemapoietic progenitor cells in vitro.

目的：利用基因芯片比较脐血CD34+和CD133+细胞基因表达的差异，并探讨碱性成纤维细胞生长因子体外诱导脐血CD34+和CD133+造血干/祖细胞分化的基因表达变化，及其对碱性成纤维细胞生长因子反应性差异。

The decisive influencing factor of viscosity in carboxyl-methylation was cross-linking reaction. Carboxyl-methylation was the main influencing factor of solubility and swelling capacity in modification of high content amylose starch. The structure and gelatinization property of different amylose content were analyzed with an Olympus Vanox BHS-2 multi-function optic microscope, and the results were as follows. The structure of ordinary cornstarch was different from the high amylose; gelatinization temperature and pH value of starch were affected deeply by amylose content, but had little difference between the gelatinization of high content amylose starch contained 50% and 70% amylose; pH value had much more effect than temperature on the gelatinization of high content amylose cross-linked starch. Monochloroacetic acid consumption, alcohol concentration and pH value influenced the starch carboxyl-methylation. When alcohol concentration was 60%, pH value 10, monochloroacetic acid/starch mass ratio 55%, the carboxyl-methylation of high amylose cross-linked cornstarch had the best result. With the In-Vitro digestibility model and biodegradation experiment, the digestibility and biodegradability of high amylose cornstarch and its modified starch were detected.

采用Brabande粘度测定仪和Olympus Vanox BHS-2型多功能光学显微镜等分析手段对链淀粉含量50％和70％的高链玉米淀粉及其交联和交联羧甲基化淀粉的结构和性质进行了表征和分析，结果表明，普通玉米淀粉结构与含链淀粉50％和70％高链玉米淀粉结构不同；高链淀粉比普通淀粉难糊化，高链改性淀粉糊化受pH值影响较大，受温度影响较小；淀粉的冻融稳定性、透光率、溶解度、膨胀度和粘度受链淀粉的含量和改性的影响，但是，链淀粉含量超过50％时，则链淀粉含量对淀粉的膨胀度和溶解度影响不大；改性淀粉性质的影响因素中，影响粘度主要因素是交联反应，影响透明度、溶解度和膨胀度主要因素是羧甲基化改性；一氯乙酸用量、反应时乙醇浓度及碱性条件都会影响高链淀粉及其交联淀粉的羧甲基化改性效果，制备羧甲基化改性淀粉的最佳工艺是在pH值为10的60％的乙醇浓度介质中按一氯乙酸/淀粉质量比为55％进行取代反应。

Preliminary Study on Enzymatic Modification of Protein──Study on Plastein Reaction of Soybean Protein with Sesame Protein;2. Utilizing alkaline hydrolysate of rice protein as substrate,the effect of plastein reaction condition on the yield of plastein was studied.

以大米蛋白的碱性蛋白酶水解产物为原料，研究了反应条件对类蛋白反应产率的影响，采用正交试验优化了类蛋白反应的条件，并分析了最佳条件下类蛋白的氨基酸组成。

On the basis of these principles and requirements,in this paper,a new modifier has been synthesized from pyromellitic dianhydride and thiosemicarbazide by the nucleophilic addition of anhydride,the cyclization of acyl thiosemicarbazide in alkaline solution,and the N-hydroxymethylation of the triazole-thione.

本文根据这一思路，以均苯四甲酸二酐和氨基硫脲为起始原料，通过酸酐的亲核加成反应、酰氨基硫脲的碱性环化反应、三唑硫酮环的N-羟甲基化反应合成出了一种新的N-羟甲基三唑硫酮酸改性剂。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。