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the yield up to
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    Experimental results indicated that the optimum conditions of esterification reaction are the molar ratio of o-phthalic acid, n-butyl alcohol and sodium hydrogen sulfate 1:2. 6:0. 22, the reaction time 1. 5 h,and the yield up to 94.24%.
    实验结果表明:酯化反应的优化条件为邻苯二甲酸、正丁醇、硫酸氢钠物质的量比为1:2.6:0.22,反应时间1.5h。 产率可达94.24%。
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    Experimental results indicated that the optimum conditions of esterificationreaction are as follows: the mole ratio of oleic acid, n-butyl alcohol and p-toluene sulfonic acid 1∶2∶0.15, the reaction time 70 minand the yield up to 93.92%.
    实验结果表明,酯化反应的优化条件为油酸、正丁醇、对甲苯磺酸摩尔比为1:2:0.15,反应时间70min,产率可达93.92%。
短句来源
    The factors influencing reaction were discussed. The results indicated the optimum conditions of esterification reaction are the molar ratio of hexanoic acid isopentanol and phsphotungstic acid pure 1:3:0.00024,the reaction time 40min,and the yield up to 98.92%.
    考察了影响反应的因素,实验结果表明酯化反应的最佳条件:己酸、异戊醇、磷钨酸的摩尔比为1∶3∶0.00024,反应时间40min. 产率可达98.92%.
短句来源
    The factors of influencing reaction were investigated. Experimental results indicated that the optimum conditions of esterification reaction are:the molar ratio of acetic acid and p-cresol and p-toluene sulphonic acid supported on active carbon is 1∶2∶0.064,the reaction temperature is 130~150 ℃,the reaction time is 30min,and the yield up to 95.87%.
    考察了影响反应的因素,实验结果表明酯化反应的最佳条件:乙酸、对甲苯酚、活性碳负载对甲苯磺酸的摩尔比为1∶2∶0.064,反应温度在130~150℃,反应时间30 m in,产率可达95.87%。
短句来源
    The factors of influencing reaction were investigated. Experimental results indicated that the optimum conditions of esterification reaction are the molar ratio of cis-2-butendioic anhydride 1-butanol and phsphotungstic acid pure 1:3:0.00024,the reaction time 45min,and the yield up to 96.05%.
    考察了影响反应的因素 ,实验结果表明酯化反应的最佳条件 :顺丁烯二酸酐、正丁醇、磷钨酸的摩尔比为 1:3:0 0 0 0 2 4 ,反应时间 4 5min。 产率可达 96 .0 5 %。
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    Results indicated that the purity is 94.67% with the yield up to 68%.
    由高效液相法测得纯度为94.67%,收率达到68%。
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    This compound efficiently catalyzed the direct asymmetric aldol reaction with the yield up to 90.0% and enantiomeric excess up to 89.5%.
    该化合物对映选择性催化直接羟醛反应,产率最高达到90.0%,对映体过量最高达89.5。
短句来源
    After adopted procedure the yield up to 90% and cost reduce 20 yuan/mg.
    采用此工艺后收率提高到90%,成本下降20元/公斤。
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    The results showed that regressionequation could anticipate the yield up to 4.1%~4.6% at 27MPa, 35℃ by the figure of response surface.
    结果表明:回归方程能较好预测萃取得率; 通过响应曲面分析预测在27MPa,35℃条件下,紫草萘醌得率为4.1%~4.6%。
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    The optimal conditions was obtained by orthogonal experiment as follows: n(NaNO 2)∶n(6-APA)=2∶1, m(PEG-400)∶m(6-APA)=0.08∶1, n(Br 2)∶n(6-APA)=2.0∶1, reaction temperature 8~12 ℃, reaction time 4 h with the yield up to 95% and purity 97%.
    通过正交实验得到最佳反应条件为 :n(NaNO2 )∶n(6 APA) =2∶1; m(PEG 4 0 0 )∶m(6 APA) =0 .0 8∶1;
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  the yield up to
Shoot excision every week from week three improved the yield up to 7 shoots per explant.
      
The main products of the reaction are α, ω-dicarboxylic acids obtained with the yield up to 77% depending on the size of acetals ring.
      
Plastic behavior beyond the yield up to failure 4.1 Prebuckling behavior In this region, the lateral load is increased until the buckling of plate.
      


The extraction and isolation of Midecarnycin experiments have been carried out with macroreticular resin adsorbent CAD-45. The yield up to 84.8% was achieved with our procedure. It was found that factors such as flow rate, pH of elution and eluant would affect the extraction efficiency.The experiment showed that the pH value was maintained at 8.3- 8.5; flow rate 1 / 6 ml/min; before eluation. The column was washed with 1% NH4OH 1 : 1 (V/V); an optimal eluate solvent was found to be butylacetate to obtain...

The extraction and isolation of Midecarnycin experiments have been carried out with macroreticular resin adsorbent CAD-45. The yield up to 84.8% was achieved with our procedure. It was found that factors such as flow rate, pH of elution and eluant would affect the extraction efficiency.The experiment showed that the pH value was maintained at 8.3- 8.5; flow rate 1 / 6 ml/min; before eluation. The column was washed with 1% NH4OH 1 : 1 (V/V); an optimal eluate solvent was found to be butylacetate to obtain satisfactory results. An isolation technique of Midecamycin was thus established.

用国产非离子型大孔网状树脂CAD—45吸附提取麦迪霉素,取代了传统的溶媒萃取法。试验确定了提取工艺条件:吸附最佳pH为8.38~8.5,流速为1/6ml/min;解吸前先用1%氨水1:1(V/V)洗柱;最佳解吸剂为醋酸丁酯,流速为1/12 ml/min。收率可达84.8%。

N,N-dimethylhydrazine is synthesised via the reactions of ammonia, hypochloride and dimethylamine, with the yield up to 87%, higher than the known reports in published articles , and the influential factors are discussed.

研究了氨一次氯酸钠法合成偏二甲肼的反应,探索出本合成法的最佳反应条件,收率达87%。对影响因素进行了初步讨论。

1,2-Isopropylidene glyceryl-a-cyanoacrylate (CAG) is a new medicinal tissue adhesive and hemostatic agent which can biodegrade rapidly. Apart from increasing the yield up to 41-51%, the improved synthesis technology introduced in this paper has many other advantages such as moderate reaction, high reaction speed and simple aftertreatment. It is proved that its hemostatic efficacy is better than the usual clinical hemostatic agent.

α-氰基丙烯酸-1,2-异丙叉甘油酯是一种新型的医用快速生物降解的组织粘合剂和止血剂。本文改进了合成工艺,提高到产率41~51%,本工艺具有条件温和,反应速度快和后处理简单的优点。经动物试验证明其止血效果优于目前临床上常用止血药物。

 
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