查询词典 substitution method

The mechanism was supposed as follows: polyfluoroalkyl iodides were initiated by sodium dithionite to give R〓 which was added to one double bond of diallylacetic acid, after the sequential radical cyclization and nucleophilic substitution to form bicyclo-lactones.

这是因为：多氟烷基碘化物在连二亚硫酸钠的引发下，得到自由基R〓，后者加成到二烯丙基乙酸中的一个—C=C—双键上，然后在碱性介质中进行分子内亲核反应得到双环内酯类产物。

Aniline compounds containing heptafluoroisopropyl was synthesized through taking sodium dithionite as evocating agent, and introducing heptafluoroisopropyl by free radical electrophilic substitution on benzene ring.

以连二亚硫酸钠为引发剂，在苯环上通过自由基亲电取代反应引入七氟异丙基，合成了一系列含七氟异丙基的苯胺类衍生物，研究了各种条件对反应的速度和收率的影响。

Polyfluoroalkyl iodides could react with unsaturated olefin acids in the presence of sodium dithionite by radical addition to give adducts. It was found that these adducts could form polyfluoroalkyl substituted γ or δ-lactones due to intramolecular nucleophilic substitution in the alkali solution.

研究发现：多氟烷基碘化物在连二亚硫酸钠存在下与不饱和烯酸经自由基加成得到的产物，能在碱性条件下进行分子内亲核取代反应形成五元或六元环的含氟内酯类化合物。

Ata small substitution(x=0.04),the perfect of Mn-O plane and the double exchange in-teraction are destroyed,which result in the decreasing of the transition temperatureof the charge-order state and the melting field within the sample.

在少量的替代下(x＝0.04)，起主要作用的是Mn-O面的破缺和对双交换作用的影响，表现为电荷有序态转变温度和低温下熔化场的下降。

Elasticity of substitution, price and wealth.

通常分析的是弹性的替代物，价格和财富。

Commonly analyzed are elasticity of substitution, price and wealth.

通常分析的是弹性的替代物，价格和财富。

With greater elasticity of substitution , it is not sensitive to a carbon tax.

在 替代弹性值大的情境下，各目标对於碳税制度的反应较不明显。

Share of intermediate input and elasticity of substitution for manufactured goods are also playing important roles.

产业关联性和产品之间的替代程度都扮演相当重要的角色。

The elasticity of substitution is a useful concept in several areas of economics.

置换弹性在若干经济学领域内是一个有用的概念。

This paper utilizes Constant Elasticity of Substitution Production Functions to study the effects of public investment on employment.

本文在分析CES生产函数过程中引入劳动力市场，探讨了公共投资与就业的联系。本文认为，公共投资是通过劳动工资弹性来影响就业的。

The father that if work,mad father, love annoys, disposition is too indrawn the be short ofing that the father of Mu Ne, resign oneself to adversity causes father easily to love is broken; Communicate time effectively between father and son, Mu Zizhi to be less than a hour on average to wait a moment every week, it is the cause that causes the child to become addiction.

如工作狂的父亲、爱愤怒的父亲、性格过于内向木讷、逆来顺受的父亲都易造成父爱的缺失；父子、母子之间的有效沟通时间每周平均小于一小时等等，都是造成孩子成瘾的原因。

These are vandal proof and they come with a locking mechanism.

这是野蛮的证据，他们来到了锁机制。