... 环上取代作用 ring substitution 碱基对取代作用 basepairsubstitution 间位取代作用 metasubstitution ...
基于18个网页-相关网页
benzene ring substitution group 苯环取代基
substitution in ring 环上取代
electrophilic substitution on benzene ring 苯环上的亲电子取代反应
nucleophilic substitution on benzene ring 苯环上的亲核取代反应
However, any substitution on the naphthyl ring decreased the bioactivity.
但若萘环上有取代基，将大大降低其生物活性。
After it was mixed with epoxy resin, transition state was formed first. Then they got on with opening ring reactions according to bimolecular nucleophilic substitution mechanism (SN2).
它与环氧树脂混合后首先形成过渡状态，然后按双分子亲核取代(SN2)机理进行开环反应。
The five quinazoline compounds were prepared by using 2 amino 4,5 dimethoxy benzoic acid as original material, which underwent ring closing, halogenation and substitution.
方法：以2 氨基4 ，5 二甲氧基苯甲酸为原料，分别经过环化、氯代、取代等反应，合成了五种目标化合物。
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