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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
- 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
- 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;
- 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。
- His training in linguistics is deficient. 他在语言学方面受到的训练是有缺陷的。
- Guofu Zhang, Jinxing Ye, Yongcan Wang, Xinmiao Liang and Jiping Chen, A catalytic procedure for epoxidation of electron deficient alkenes, China Patent (Chinese) CN200310119471.6 张国富;叶金星;王永灿;梁鑫淼;陈吉平;一种催化氧化关能化烯烃生成环氧化物的方法;申请号：200310119471.;6。
- Our knowledge of the matter is deficient. 我们对此事了解不足。
- Deficient in conviction or courage; timid. 胆小的，怯懦的缺乏勇气或决断的；胆怯的
- Deficient in taste, delicacy, or refinement. 不优雅的，粗鲁的品味、格调或教养不高的
- Deficient in emotional warmth; cold. 无人情味的，冷酷的缺乏感情上的热忱的；冷淡的
- A mentally deficient person; an idiot. 白痴智力缺陷的人；傻瓜
- A person of deficient intelligence. 傻瓜智力有缺陷的人
