该显色反应选择性好。
优化结果表明，反应选择性可提高2%以上。
The optimization results indicated that the reaction selectivity increased by over 2%.
因此，与芳基取代的烯丙基碳酸反应选择性。
Thus, the reaction with aryl-substituted allylic carbonates is regioselective.
分析了温度和浓度是影响复合反应选择性的主要因素。
The main influencing factors on the selectivity of complex reaction are analysed.
利用计算机编程绘制出内扩散对连续反应选择性的影响图。
Using computer programme, the effect element figure of inner diffusion on selectivity of consecutive reaction is drawn.
这个词，它的字面意义是“反应选择能力”，是一种选择能力。
Look at the word responsibility, ability to choose your response, response-ability.
本发明用于封端聚醚的合成，能有效提高反应选择性和聚醚封端率。
The present invention is used in the synthesis of capped polyether to raise the reaction selectivity and polyether capping rate effectively.
本发明具有原料易得，工艺简单，操作简便，反应选择性好，产物收率高；
The method of the invention has the advantages of easily available materials, simple process, easy operation, good reaction selectivity and high yield;
文章通过实验证实人类的反应组织是在反应选择加工阶段同时完成的多任务之一。
This paper presents the experimental verification showing that programming response is one of the tasks completed in the stage of selecting response simultaneously.
介绍了超临界流体的概念、原理和特点，及在超临界下反应动力学和 反应选择性。
Concept, theory and characteristics of supercritical liquid, reaction kinetics and reaction selectivity under supercritical liquid.
进而，在反应选择瓶颈理论的基础上提出反应选择瓶颈加工过程的假设-扫描选择反应模型。
Based on experimental results, a model for selection response bottleneck is developed, and a hypothesis on scanning response selection is proposed.
近年来，出现了一些提高复合反应选择性的新方法，如：超临界反应、膜反应、反应精馏等。
Recently, some new methods, such as supercritical chemical reaction, membrane reaction, and reactive distillation, have been applied to improve the selectivity of complex reaction.
认为超临界流体和离子液体对于提高反应速度和反应选择性，提高催化剂催化效率等方面具有良好效果。
The supercritical liquid and the ionic liquid have excellent effect to enhance the reactive speed, selectivity and catalysis efficiency.
本发明使用不含水的碱性无机固体微胶囊，可以在反应过程中缓慢释放强碱，确保反应选择性和封端率。
In this invention, alkaline inorganic solid microcapsule is used, and the latter can slowly release strong alkali to ensure the reaction selectivity and the and capping rate.
结果与结论3种方法中，采用氢溴酸作催化剂的反应选择性最高，收率达到95.67%，产物结构经1H-NMR和EI-MS确证。
The optimal catalyst was HBr with a highest selectivity and yield of 95.67%. The structure of emodin synthesized was characterized by 1H-NMR and EI-MS.
本发明具有反应条件温和、操作过程简单、催化剂价廉易得、反应选择性好、反应转化率高等优点，是一种满足工业化需求、实用性很强的方法。
The present invention has mild reaction condition, simple operation, easy-to-obtain catalyst, high reaction selectivity and high conversion rate and has high industrial practicability.
考虑到实验的酸性条件，反应时间不宜过长，对于一定离子浓度溶液应选择恰当的加入量。
For the acid reaction condition, the reaction time should not last long, and suitable amount of the solution should be added according to its ion concentration.
考虑到实验的酸性条件，反应时间不宜过长，对于一定离子浓度溶液应选择恰当的加入量。
For the acid reaction condition, the reaction time should not last long, and suitable amount of the solution should be added according to its ion concentration.
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