查询词典 choice reaction

Base played a crucial role in this reaction: in the Pd2/L1 catalyzed α-arylation of ethyl malonate, K3PO4 is the base of choice; in the α-arylation of ethyl acetoacetate, K2CO3 is the most effective base.

在这类催化反应中，碱的选择具有重要的影响：以K3PO4为碱， Pd2/L1催化体系在丙二酸二乙酯的α-芳基化中，富电子溴代芳烃显示较好的活性； Pd2/L1催化的乙酰乙酸乙酯α-芳基化时，以 K2CO3为碱，催化体系显示较好的活性，这个催化体系可控制反应得到α-芳基乙酰乙酸乙酯，而不是脱乙酰基的产物。

Base played a crucial role in this reaction: in the Pd2/L1 catalyzed α-arylation of ethy malonate, K3PO4 is the base of choice; in the α-arylation of ethyl acetoacetate, K2CO3 is the most effectiv base.

在这类催化反应中，碱的选择具有重要的影响：以K3PO4为碱，Pd2/L1催化体系在丙二酸二乙酯的α-芳基化中，富电子溴代芳烃显示较好的活性；Pd2/L1催化的乙酰乙酸乙酯α-芳基化时，以K2CO3为碱，催化体系显示较好的活性，这个催化体系可控制反应得到α-芳基乙酰乙酸乙酯，而不是脱乙酰基的产物。

Basing on experimental study, the article analyses the process of calcination and desulfuration reaction and builds a mathematical model of calcium-based materials (limestone, shell and their mixture), which will provide theoretical basis and practical guidance for improved performance of the normal sulfur sorbent and the choice of new sulfur sorbent.

然而传统的燃煤固硫剂石灰石，因钙转化率低而使该技术的推广应用受到限制，在实验研究的基础上，对钙基材料—石灰石和贝壳用于燃煤的煅烧固硫反应过程进行数学建模与分析，以便为改善常规固硫剂的性能，选择新型固硫剂提供理论依据和实用指导。

Panic was my first reaction to the multiple choice options which lay on my desk in front of me.

这么多的选择摆在我面前的桌子上，我的第一感觉便是恐慌。

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。