反应率

The influence of reaction temperature, reaction solution pH, the amount of solvent and reaction time on the extract yield of rutin was discussed.

探讨了反应温度、反应液的pH值、溶剂用量及反应时间对产物芦丁提取率的影响。

Effects of main reaction conditions such as reaction time to the coupling reaction and the yield of squalene were studied primarily.

初步探索了主要反应条件如反应时间等对偶联反应中产物角鲨烯得率的影响。

Thermolysis of DM-DMI bis-carbamate was carried out in 3wt % solution of diphenyl ether at 254℃ for 5-6 hours, and the yield of DM-MDI is 61％ after purification.

而在第二步骤的热裂解反应中，在3wt ％二苯醚溶液中，控制反应温度在254℃，经反应5-6小时即得到DM-MDI，经浓缩及纯化后主产物之产率为61％。

Phenyl or m -tolyl selenoamides reacted with functionalized α-haloacetic acid in 1∶1 or 1∶2 molar ratio with no catalyst in various alcohols to undergo a selenium transfer reaction. This reaction in dif-ferent molar ratios furnished the same C—Se—Se—C coupling products with a special structure bis diselenide. A new and facile method for synthesis of such bis(alkoxycarbonyl-methyl) diselenides with the advantages of mild reaction conditions, high yields, easy availability of starting materials and good chemical selectivity was provided.

芳基硒代酰胺与氯乙酸在各种醇中无催化剂下以1∶1和1∶2的比例投入，发生硒转移反应，不同原料投入比下的反应生成了同一种C—Se—Se—C偶联产物——具有多功能团的二烷氧羰基甲基二硒醚，提供了一种新的合成二烷氧羰基甲基二硒醚的简便方法，且反应具有条件温和、产率高、原料易得和选择性好等优点。

The novel vacuum furnace is employed in laboratory study. Compared with atmosphere magnesium carbothermic reduction furnace, this new one has the merits of high automation, easy manipulation and fine safety. Vacuum coking, vacuum carbothermic reduction process and magnesium vapory condensation process can be carried out in a furnace.

小型实验结果证明：还原温度升高，还原时间延长，氧化镁还原率增大，添加适量的氟化物对还原反应有促进作用；还原过程中真空度随时间的变化具有规律性，由此可以判断还原反应进行的速度与程度；真空中煤还原氧化镁的条件是：配料时保证C：MgO=3：1，并加入占总料重10％的氟化钙作为催化剂，尽可能的提高反应温度至1500℃以上，保温30～40分钟。

The influences of the partical size of witherite, the initial concentration of nitric acid, the stirring speed, the reaction time and temperature on the decomposition rate of witherite are discussed.

分别对毒重石粒度、硝酸初始浓度、搅拌强度、反应时间、反应温度对毒重石分解率的影响进行讨论，并研究了硝酸分解毒重石反应过程机理及宏观动力学。

This process had the advantages of simple workup, short reaction time, high yield, mild and environment friendly.

该合成反应条件温和，反应时间短，操作简便，产率高，是一种环境友好型催化反应。

Anhydrous alcohol and glacial acetic acid were used as component solvent, which the volume ratio was 2:1, zinc dust as reductant, reaction temperature was 25~35℃, reaction time was 2 h, the yield was 81%.

在还原反应中采用无水乙醇和冰醋酸的混和溶剂，两种溶剂的体积比为2：1，以锌粉为还原剂，反应温度为25~35℃，反应时间为2h，产率为81%。

Various reaction parameters such as ratio of ethyl acetoacetate to ethylene glycol,catalyst amount,reaction time and water-carrying reagent amount were studied.

讨论了酯醇比、催化剂用量、反应时间、带水剂用量对酯化率的影响。最佳反应条件为：n：n=1：1.8，催化剂用量为乙酰乙酸乙酯质量的2%，带水剂用量为20mL，反应时间3h。

In chapter three,we investigated a new Baylis-Hillman-type reaction,organozinc speciesCF_3COOZnEt can react withα,β-acetylenic ketones and N-tosylated imines providing Baylis-Hillman adducts in good yield in the absence of any catalysts.

有机锌试剂CF_3COOZnEt可以与各种类型的α，β-炔酮及亚胺发生偶联反应，高产率的得到β-取代的Morita-Baylis-Hillman反应加合物，这类反应不需要任何的催化剂，产物具有立体单一型，完全是Z式结构。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。