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- These processes are frequently catalyzed by acids and involve electron deficient intermediates called carbocations. 这些过程通常由酸催化;牵涉缺乏电子;名为碳正离子的中间体.
- Abstract : A novel efficient procedure has been developed for the conjugate addition of amines to electron deficient alkenes. 摘要 ： 提供了一种新型高效的催化缺电子烯与胺类的共扼加成的反应体系。
- The results showed that the catalyst was very efficient for the conjugate addition of amines to electron deficient alkenes with excellent yields in several minutes. 在进一步的催化反应过程中发现，该催化剂对反应具有很高的催化活性，能催化该反应在短短数分钟内完成。
- This paper deals with the reaction of 1,2,3 trisubstituted electron deficient cyclopropane derivatives cis 1 carbomethoxy 2 p substitutedphenyl 6,6 dimethyl 5,7 dioxo spiro [2,5] 4,8 octadiones with thiophenol to give the products 4 and 5a. 报导1;2;3-三取代贫电子环丙烷衍生物顺-1-甲氧羰基-2-对位取代苯基-6;6-二甲基-5;7-二氧-螺-[2;5]-4;8-辛二酮与苯硫酚的反应.
- They lack the ability to delocalize the electron deficiency on oxygen. 它们没有使氧原子上的部分正电荷离域的能力。
- One that is physically or mentally deficient. 有缺陷的人身心不健全的人
- Oxygen enters into many compound bodies. 氧是许多化合物的组成部分。
- Deficient in quantity, fullness, or extent; scanty. 不足的，缺乏的在数量、程度或范围上缺乏的; 不足的
- Air is a mixture, not a compound of gases. 空气是气体的混合物，不是化合物。
- Rose is a plant with compound leaves. 玫瑰是复叶植物。
- Study on the Reaction of 1,2,3-Trisubstituted Electron Deficient Cyclopropane Derivatives with Thiophenol 1,2,3一三取代贫电子环丙烷衍生物与苯硫酚反应的研究
- "Broad-shouldered" is a compound word. "Broad-shouldered"是个复合字。
- Common salt is a compound of sodium and chlorine. 食盐是钠和氯的化合物。
- The transmitter was pulsed by an electron tube. 电子管使发射器产生脉冲波。
- My friend's family lives in the compound. 我朋友的家住在那个大院里。
- Keywords Samarium（ II） diiodide;electron deficient alkenes;reductive coupling reaction; 二碘化钐;缺电子烯烃;还原偶联;
- A chemical compound consisting of such molecules. 二聚化合物这种聚合物形成化合物
- An organic compound containing many double bonds. 多烯一种包含许多双键的有机化合物
- An electron tube having a cathode and an anode. 电子二极管有一个阳极和一个阴极的电子管
- The crops are suffering from deficient rain. 庄稼因雨量不足而遭受损害。
