1) substituent
[英][sʌb'stitʃuənt] [美][sʌb'stɪtʃʊənt]
取代基
1.
Effect of Substituents on Benzene Skeleton Vibration in IR Spectra;
红外光谱中取代基对苯环骨架振动吸收峰的影响规律
2.
The electrostatic effect constants for the substituents in an aromatic system were used firstly to study the bond dissociation enthalpy (BDE) of a halomethane system Y-CHnX3-n (n=0,1,2 and 3; Y=H,F,Cl,Br and I; X=F,Cl,Br and I).
将芳环上取代基的电子效应参数引入卤代甲烷,以卤代甲烷分子Y-CHnX3-n(n=0～3;Y=H,F,Cl,Br,I;X=F,Cl,Br,I)中Y—C键的标准键焓EYs-C与中心C原子相键连原子的场/诱导效应之和ΣFi、共轭效应之和ΣRi以及诱导偶极之和Σ(α×F)为参数,建立了一个定量估算卤代甲烷分子中Y—C键离解能(BDE)的通用模型,BDE(Y—C)=57。
3.
It is found that the catalytic activity of oxazaphospolidine—borane is concerned by various substituents connecting with phosphorus atom and the charge distributing on phosphorus and boron atoms in oxazaphospolidine—borane catalysts.
根据优化所得催化剂的几何构型和电子结构,从空间效应和电子效应两方面对催化剂分子进行了分析和讨论,以期从理论上揭示取代基对手性唑磷—硼烷催化活性的影响。
2) substituents
取代基
1.
The influence of substituents on nitriliums with bicycle[2.2.1]-hept-2-ene;
氮杂炔正离子与环烯反应的机理及取代基效应
2.
The influence of different substituents to the addition reaction also has been investigated to research into the reaction law.
并在同一水平上研究了当R,R1和R2分别为不同烷烃取代基的同分异构体时,得到不同产物的反应情况,找出这类反应随取代基不同的变化规律。
3.
The effects of substituents on the nucleophilic reaction of benzyl halide and sodium azide were studied.
合成了叠氮苄、对氰基叠氮苄,对氟叠氮苄,对甲基叠氮苄和联苯二叠氮苄,研究了苯环上不同取代基对苄基卤代物与叠氮化钠经亲核取代反应生成苄基叠氮化物的反应的影响。
3) substituting group
取代基
1.
Theoretical study on the effect of substituting group on the electronic spectrum of 8-hydroxyquionline lithium;
取代基对8-羟基喹啉锂电子光谱影响的理论研究
2.
the orientation rule of substituting groups in benzene ring is often explained with electronic effect (inductive effect and conjugative effect).
有机化学教材中通常是从电子效应(诱导和共轭)来解释苯环上取代基的定位规律。
5) Ylene substitution
亚基取代
补充资料：电负性取代基
分子式：
CAS号：
性质：指电负性强的取代基，如—F，—Cl，—Br，—CN，—NO2等基团。
CAS号：
性质：指电负性强的取代基，如—F，—Cl，—Br，—CN，—NO2等基团。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条