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The results show that all these three factors are helpful to increase the alcoholysis degree,but the influence from the amount of alkali contributes the greatest,and the influence from the reaction temperature is the least.

结果表明,三种参数的增加都会使产物的醇解度增加,其中碱物质的量比的影响最大,其次是反应时间,反应温度对产物醇解度的影响最小,几种参数对醇解反应的影响是交互的,当其中一种参数发生变化时,其它几种参数的影响能力会随之发生改变。

In particular, when the Knoevenagel condensation of 2-hydroxybenzaldehyde was conducted with ethyl 2-cyanoacetate, 3-ethoxycarbonylcoumarin was obtained by simultaneous cyclization and alcoholysis of cyanide.

当反应底物为水杨醛与氰基乙酸乙酯的时候,产物为3-乙氧基羰基香豆素,这是水杨醛和氰基乙酸乙酯缩合关环,再发生氰基醇解的产物

To determine the product distribution of the reaction mixture, an aliquot will be analyzed by thin-layer chromatography.

为了确定反应混合物中产物的分布,可以对一吸量管的产物进行薄层层析分析。

To determine the product distribution of the reaction mixture, an aliquot will be

为了确定反应混合物中产物的分布,可以对一吸量管的产物进行薄层层析分

In this process the alkylate concentration is kept at a relatively low level, thereby minimising the amount of undesired by-products that can be formed by, e.g., degradation of alkylate and condensation of degradation products.

在该方法中,烷基化物浓度保持在相对低的水平,这样,由例如烷基化物的降解或降解产物的缩合形成的不希望的副产物的量可以降到最低。

Combining the performance evaluation (activity, selectivity and stability) and the characterization of the catalysts (XRD, TPD, FTIR and the pore structure measure), it can be concluded that :(1)The activity of modified β is higher than MCM-22, but the selectivity of ethylbenzene is lower about 3% than that of MCM-22;(2)The mounts of diethylbenzene and the other by-products are higher 1.7 times and 1.5 times than these of MCM-22 respectively;(3)The catalytic performance of zeolite mixture is nearly equal to modified β, but the selectivity of ethylbenzene is higher about 0.5% than that of modified β;(4)The catalytic activity of zeolite is mainly correlated with the number of acid sites, strength and distribution, and the distribution of products is determined by the binding energy of ethylbenzene and the pore structure, while the stability of catalyst is affected by the amount of poly-ring aromatic alkylate and the pore structure.

以性能评价和特性表征(XRD、TPD、FTIR和孔结构测定)相结合的方式,对上述三种催化剂性能比较的结果表明:(1)改性的活性明显高于MCM-22,但乙苯选择性却低于MCM-22绝对差约3%;(2)改性(上二乙苯和其他副产物的生成量分别约为MCM-22上对应值的1.7和1.5倍左右;(3)混合型催化剂的性能与改性相仿,但乙苯选择性提高0.5%左右;(4)对乙苯合成,沸石催化剂的活性主要取决于其B酸中心数、酸强度及酸分布,产物分布则取决于催化剂表面的乙苯脱附能垒值和孔道结构,而稠环芳烃的生成量和催化剂孔道结构是影响催化剂稳定性的主要因素。

It was found that the stereoselectivity of this reaction to produce S-CHBE could be remarkably improved by pretreatment with heating and allyl alcohol.

而烯丙基溴预处理可以使反应立体选择性从通常的生成S-型产物过量转变为R-型产物过量,优化处理条件后能使R-CHBE的e.e。

Results Bile acid metabolites were different between the patients and the healthy controls, even the dead patients and the cured patients. On the fourth day of consuming amanita verna, the bile acid metabolites of the dead patients were markedly different from those of the cured patients.

结果 白毒伞中毒患者的胆汁酸代谢产物与健康对照组有很大差异;死亡患者与治愈患者的胆汁酸代谢产物也不相同;二者之间的差异在食后第4天就明显地表现出来。

The amination activity and selectivity of the catalysts can be improved by properly optimizing the compositions of the catalysts and corresponding preparation method.

苯酚是本实验条件下的主要副产物,通过催化剂的调变,可增大苯胺的选择性,降低副产物苯酚的选择性。

The accurate molecular weights of each components were determined. The amine acid sequences of the main components were analyzed by MS/MS synchronously.

结果证明,粗产物中的主成分即为目标十三肽,另外几个主要副产物为十三肽的残缺肽或氧化肽。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

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