...是丁炔二酸与甲醇形成的羧酸酯,结构简式为CH3O2CC2CO2CH3。这种酯在常温常压下以液态存在,具有很强的亲电活性。因此,丁炔二酸二甲酯在实验室中广泛用作环加成反应(例如Diels-Alder反应)的亲双烯体。它也是一种活泼的Michael加成反应的受体。
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...性自由基可控聚合方法,其基本原理就是有机合成反应中应用很广的原子转移自由基加成反应(Atom Transfer Radical Addition, ATRA),它以烷基卤代烃为引发剂, 过渡金属为卤原子载体, 通过氧化还原反应, 在活性种和休眠种之间建立可逆...
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...一种活性自由基可控聚合方法,其基本原理就是有机合成反应中应用很广的原子转移自由基加成反应(Atom Transfer Radical Addition, ATRA),它以烷基卤代烃为引发剂, 过渡金属为卤原子载体, 通过氧化还原反应, 在活性种和休眠种之间建立可逆...
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加成反应 [化学] addition reaction ; additioncompoundreaction ; Michael addition
环加成反应 cycloaddition ; [化学] cycloaddition reaction ; CuAAC
亲电加成反应 electrophilic addition ; electrophilic addition reaction
亲核加成反应 nucleophilic addition ; nucleophilic addition reaction
生成反应 formation reaction ; reaction of formation
合成反应 building-up reaction
药物合成反应 Pharmaceutical synthetic reactions ; Organic Reactions for Drug Synthesis ; Drug Synthetic Reactions ; Synthetic Reaction of Pharmaceuticals
合成反应器 synthesis reactor
完成反应 Consummatory response
其中二十多个在中国。 预计中国将超越美国,到2030年成为拥有核反应堆最多的国家。
More than 20 are in China, which is forecast to surpass America and have the most nuclear reactors around 2030.
如上面所述,用例的权重是由它所包含的用例事务的数量所决定的,但是,什么时候系统对刺激源的反应会计算成不同的?
As stated above, the weight of a use case is determined by the number of different use case transactions it contains. But exactly when does the system's reaction to a stimulus count as different?
人造机器把鸟锯成两半,这种观点激发了人类的本能反应;而捕食者口中含着的猎物这一观点,我们会视之为自然的本性。
"The idea of a man-made machine chopping a bird in half creates a visceral reaction," he said, "while the idea of a predator with its prey in its mouth - well we've seen that on the Nature Channel."
It deconvolves that reaction of sodium plus chlorine into elementary steps that are related to electron transfer and acquisition.
它将钠和氯的反应,分解成基本的步骤,这些步骤是直接与电子的转移和获得有关的。
This completely could change if you were to flip from one to the other conformation which can happen in chemical reactions.
在化学反应中,它们的形状,可以从一种折叠成另外一种。
And this will become more and more clear as we actually talk about these reactions and talk about bonding.
而这将会变得越来越清楚,在我们讨论这些反应以及讨论成键的过程中。
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