并且对亲核试剂的体积效应、溶剂效应对亲核性影响，底物上吸电子基团的数目、吸电子能力对亲电性的影响，以及亲核取代反应的发生部位受哪些因素影响进行探讨。
At the same time, discuss about the impact factor to nucleophilicity such as the number of attract electron group, ability of attract electron and the nucleophilic substitution reaction part.
从而用微扰分子轨道理论半定量地解释了脂肪族的游离基取代和芳香族的游离基取代反应的反应性和选择性。
The reactivities and selectivities of aliphatic and aromatic free-radical(substitution)reactions were explained semi-quantitatively by the perturbation molecular orbital theory.
因此，与芳基取代的烯丙基碳酸反应选择性。
Thus, the reaction with aryl-substituted allylic carbonates is regioselective.
以硫酸化蓖麻油和季铵盐（ETA）为原料，在一定的反应条件下，硫酸化蓖麻油分子中的羟基与ETA发生取代反应，合成季铵型两性表面活性剂，与其它物质复配成两性皮革加脂剂。
The amphoteric surfactant was synthesized by sulfuric castor oil and ETA. The reaction condition of surfactant were deeply studied. The amphoteric fat liquor was recombinated with other surfactants.
同时，我们还研究了取代基团的电子效应和位阻效应对反应产率和区域选择性的影响。
At the same time, we have also investigated the influence of the electric effect and steric hindrance effect of the substituents to the yields and regioselectivity.
骨髓部分或全部由单一造血细胞成分取代，脾的正常结构被破坏并由单一细胞取代；其他器官单一性细胞浸润并无炎症反应，符合白血病的诊断。
All the cases with leukemia showed badly emciated, splenomegaly, spleen and bone marrow with replacement of single cell type, the infiltration of leukemic cell in lung, liver and so on.
研究了烷基苯基硅铜酸盐与2-环烯酮的1，4-加成反应的立体选择性，并合成了一系列新的2-取代-3-硅基环烷酮。
The stereoselectivity of 1,4-addition of dialkylphenylsilyl cuprates to 2-cycloenones was investigated and meantime a series of new 2-substituted-3-silylcycloalkanones were synthesized.
研究了烷基苯基硅铜酸盐与2-环烯酮的1，4-加成反应的立体选择性，并合成了一系列新的2-取代-3-硅基环烷酮。
The stereoselectivity of 1,4-addition of dialkylphenylsilyl cuprates to 2-cycloenones was investigated and meantime a series of new 2-substituted-3-silylcycloalkanones were synthesized.
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