您要查找的是不是:
- These processes are frequently catalyzed by acids and involve electron deficient intermediates called carbocations. 這些過程通常由酸催化;牽涉缺乏電子;名為碳正離子的中間體.
- Abstract : A novel efficient procedure has been developed for the conjugate addition of amines to electron deficient alkenes. 摘要 : 提供了一種新型高效的催化缺電子烯與胺類的共扼加成的反應體系。
- 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. 在進一步的催化反應過程中發現,該催化劑對反應具有很高的催化活性,能催化該反應在短短數分鐘內完成。
- 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. 報導1;2;3-三取代貧電子環丙烷衍生物順-1-甲氧羰基-2-對位取代苯基-6;6-二甲基-5;7-二氧-螺-[2;5]-4;8-辛二酮與苯硫酚的反應.
- They lack the ability to delocalize the electron deficiency on oxygen. 它們沒有使氧原子上的部分正電荷離域的能力。
- You need a strong adhesive to bond wood to metal. 需要強力膠才能把木料粘在金屬上。
- This glue makes a good firm bond. 這種膠水粘得很結實。
- Common tastes form a bond between the two men. 共同的愛好使兩人結交為朋友。
- The bond that binds the smugglers together is a rope of sand. 把走私犯聯接起來的是條沙做的繩子,一碰就碎。
- One that is physically or mentally deficient. 有缺陷的人身心不健全的人
- Common interests formed a bond between us. 共同的利益把我們聯繫在一起。
- Identity of interests is the bond that unites them. 利害的一致是把他們聯合起來的紐帶。
- Deficient in quantity, fullness, or extent; scanty. 不足的,缺乏的在數量、程度或範圍上缺乏的; 不足的
- A unifying bond, especially a marriage bond. 結合一種聯結的紐帶,尤指婚姻紐帶
- Study on the Reaction of 1,2,3-Trisubstituted Electron Deficient Cyclopropane Derivatives with Thiophenol 1,2,3一三取代貧電子環丙烷衍生物與苯硫酚反應的研究
- The transmitter was pulsed by an electron tube. 電子管使發射器產生脈衝波。
- A bond of sympathy developed between members of the group. 該組織成員間產生了志同道合的凝聚力。
- Keywords Samarium( II) diiodide;electron deficient alkenes;reductive coupling reaction; 二碘化釤;缺電子烯烴;還原偶聯;
- An electron tube having a cathode and an anode. 電子二極體有一個陽極和一個陰極的電子管
- The crops are suffering from deficient rain. 莊稼因雨量不足而遭受損害。