查询词典 Chain Reaction

Synthesis of Antidote of N-Dichloroacetyl-2-methyl-1-oxa-4-aza-spiro-4.4-nonane BI Hong-mei, ZHANG Jin-yan, LIANG Ying, SHEN Yong (College of Arts and Sciences Heilongjiang August First Reclamation University, Daqing 163319, Heilongjiang, China) Abstract: N-Dichloroacetyl-2-methyl-1-oxa-4-aza-spiro-4.4-nonane was synthesized by one pot method with isopropanolamine, cyclopentanone and dichloroacetyl chloride. The optimum reaction conditions obtained are as follows:the proportion in moles of the above materials is 1∶1∶1.2, reaction solvent is toluene, reaction temperature is -15 to -10 ℃,reaction time is 3 h, under the optimum condition, the yield of the compound is 50.0%.

除草剂解毒剂N-二氯乙酰基-2-甲基-1-氧杂-4-氮杂-螺[4.4]壬烷的合成毕洪梅，张金艳，梁英，沈勇(黑龙江八一农垦大学文理学院，黑龙江大庆 163319)摘要：以33%的氢氧化钠水溶液为缚酸剂，异丙醇胺、环戊酮和二氯乙酰氯为原料，采用&一锅法&合成了N-二氯乙酰基-2-甲基-1-氧杂-4-氮杂-螺[4.4]壬烷，采用正交实验法得到最佳反应条件：反应原料摩尔比为1∶1∶1.2，苯作溶剂，反应的温度为-15 ℃~-10 ℃，搅拌时间为3 h，产率达到50.0%。

Firstly, dicyclopentyldichlorosilane, a reaction intermediate, was prepared under the optimal conditions of a reaction pressure range of 1.0-1.2 MPa, a n/n of 1.16, a reaction temperature range of 85-95℃, a catalyst dosage of 1.2 g, an isooctyl alcohol dosage of 2.3 g and a reaction time range of 6-7 h. The conversion of cyclopentene and the yield of DCPDCS were 96.2% and 88.9%, respectively.

首先研究了合成DCPDCS的最佳工艺条件：反应压力1.0~1.2 MPa，n/n= 1.16/1.00，反应温度85~95 C，催化剂用量1.2 g，异辛醇用量2.3 g，反应时间6~7 h，环戊烯转化率可达96%以上，DCPDCS收率可达88%以上。

The results showed that the synthesis reaction was biphasic, because of the presence of the intermediate product dicalcium phosphate dehydrate. The second step reaction occurred just at the end of the first one and ended rapidly in less than 30s, which was called as explosive reaction. The pseudo-Avrami equation was used to describe the reaction processes.

结果表明，合成过程为生成中间产物二水磷酸氢钙的两步式反应，其中第二步反应在第一步反应结束后才开始，并且在很短的时间内(0s)迅速完成，即发生了&爆炸式&反应，反应过程可用类Avrami方程进行表征。

The condition factors in ethanolysis reaction,namely the reaction of rapeseed oil with ethanol catalyzed by lipase LVK,to produce bio-diesel were investigated,and the factors included molar ratio of ethanol to oil,catalyst dosage,reaction temperature,reaction time,and so on;the effect of organic solvent and the procedure of ethanol addition were also investigated.

得出脂肪酶催化菜籽油乙醇解制备生物柴油的最佳反应条件为：醇油摩比5：1、催化剂用量10%、反应温度40℃、反应时间为36 h、正己烷15%。

Ethyloxymethylnaphththyridinecarboxylic acid ; condensation reaction ; cyclization reaction ; ethylation reaction ; hydrolysis reaction ; spectrum characteristic

乙基氧甲基萘啶羧酸；缩合反应；成环反应；乙基化反应；水解反应；光谱特征

The results show that this reaction proceeds in two step: 1 silylene and formaldehyde form an intermediate complex, which is a kind of exothermal reaction with no barrier; 2 the intermediate complex isomerizes to sive the product. The barrier for the second step is 51.4kJ·mol^-^1 at MP2/6-31G^*//6-31G^* level (with zero-point energies correction). In view of dynamics and thermodynamics, it is between 300～400K that the reaction will have not only larger spontaneous tendency and equilibrium constant but also quicker reaction rate.

结果表明，此反应历程由两步组成：1硅烯与甲醛生成一中间配合物，是一无势垒的放热反应，2中间配合物异构化为产物，此步势垒经零点能校正后只有51.4kJ·mol^-^1(MP2/6-31G^*//6-31G^*)；从热力学和动力学的综合角度考虑，该反应在300～400K温度下进行为宜，如此，反应既有较大的自发趋势和平衡常数，又具有较快的反应速率。

When The degree of hydrolyzation of oyster protein was 16.39%, and the proportion oyster hydrolysate to the sucrose hydrolysate was 100:3, and the reaction moisture and pH and temperature were 75% and 7.5 and 115℃ respectively, the reaction produced appropriate flavor matters, such as 2-furanmethanol which contributed good flavor to the product, while the reaction time was 0.5h. Maillard reaction was able to conceal fishiness effectively.

结果表明，当牡蛎蛋白质的水解度为16.39%，并按100∶3的比例添加砂糖水解液时，在反应物浓度为25%、pH7.5和115℃条件下反应时间0.5h能生成适量的2-呋喃甲醇等风味物质，产生适度的焦香味，达到比较理想腥味掩盖效果。

The optimum synthetic conditions of hexadecanoic acid diethanolamide used two-step method are as follows:(1)reaction temperature was 140℃, reaction time was 4.5hours and molar ratio of hexadecanoic acid to diethanolamide was 1:1.15.(2)reaction temperature was 80℃, molar ratio of hexadecanoic acid to diethanolamide was 1:1.55 and mass concentration of the catalyst was 0.8%, reaction time was 3 hours.

二步法合成十六酸二乙醇酰胺最佳合成工艺为：(1)反应温度140℃、反应摩尔比n十六酸∶n二乙醇胺=1∶1.15、反应时间4.5h；(2)反应温度80℃、反应总摩尔比n十六酸∶n二乙醇胺=1∶1.55、催化剂用量0.8%、反应时间3h。

The Effect of different reaction conditions (solvent, reaction temperature, molar ratio of iodobenzene and acrylic acid, kind and amount of base, amount of catalyst, reaction time) on the yield was investigated. The suitable condition of the reaction was obtained.

考察了不同反应因素（溶剂、温度、原料比、缚酸剂及其用量、催化剂用量、反应时间）对反应的影响，确定了该催化剂对碘代苯与丙烯酸交叉偶联生成反式－肉桂酸的适宜反应条件。

Synthesis of biodiesel by transesterification of rapeseed oil and methanol catalyzed by KOH/Al2O3 solid base was studied. The catalyst was prepared by isochoric impregnation. Effects of some factors on the transesterification were investigated systematically and reaction conditions were optimized. The optimum reaction conditions on KOH/Al2O3 catalyst were: mass ratio of KOH to Al2O3 20%; calcination temperature 400℃ for 5h; molar ratio of methanol to oil 12:1, the amount of catalyst 5wt%; reaction temperature 60℃ and reaction time 2h.

采用等体积浸渍法制备了KOH/Al2O3负载型固体碱催化剂，并将其用于菜籽油与甲醇酯交换法合成生物柴油的研究；分别考察了催化剂附载量、锻烧温度、醇油摩尔比、反应温度、反应时间等条件对生物柴油产率的影响；结果表明：用等体积浸渍法，在400℃煅烧5h，制得负载量为20%的KOH/Al2O3催化剂。

I had a lovely dog named PiPi, he was one of my best friends.

我曾经有过一只小狗，它的名字叫皮皮，它很善良，它是我最忠实的朋友。

Newly ovulated mouse oocytes were cultured in the CZB medium supplemented with different concentrations of pyruvate before treated for activation or assayed for MPF activity.

我们猜测卵母细胞在不含丙酮酸的条件下老化的更快，并且卵丘细胞可能通过消耗不含葡萄糖的CZB中的丙酮酸从而促进卵母细胞老化。