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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。
You need a strong adhesive to bond wood to metal. 需要强力胶才能把木料粘在金属上。
This glue makes a good firm bond. 这种胶水粘得很结实。
Common tastes form a bond between the two men. 共同的爱好使两人结交为朋友。
One that is physically or mentally deficient. 有缺陷的人身心不健全的人
The bond that binds the smugglers together is a rope of sand. 把走私犯联接起来的是条沙做的绳子，一碰就碎。
Common interests formed a bond between us. 共同的利益把我们联系在一起。
Identity of interests is the bond that unites them. 利害的一致是把他们联合起来的纽带。
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
A unifying bond, especially a marriage bond. 结合一种联结的纽带，尤指婚姻纽带
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
The transmitter was pulsed by an electron tube. 电子管使发射器产生脉冲波。
Keywords Samarium（ II） diiodide;electron deficient alkenes;reductive coupling reaction; 二碘化钐;缺电子烯烃;还原偶联;
A bond of sympathy developed between members of the group. 该组织成员间产生了志同道合的凝聚力。
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。