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。
The synthesis of metallocene, the effects of substitution in cyclopentadiene ring, reaction medium for synthesis and separation of chiral metallocene have been highlighted.
重点介绍了金属茂的合成方法及环戊二烯环上的取代基、溶剂对合成及分离旋光性金属茂的影响。
Resilient Packet Ring (RPR) is regarded as the substitution to re -build man to meet the demand.
弹性分组环(rpr)被认为是重建城域网以满足新业务需求的替代方式。
The benzene ring itself is not susceptible to low-temperature oxidation, but its substitution into a paraffinic chain increases the response of the latter.
苯环本身对低温氧化并不敏感，但当它取代进入烷烃链后，将增加链对低温氧化的响应。
The benzene ring itself is not susceptible to low-temperature oxidation, but its substitution into a paraffinic chain increases the response of the latter.
苯环本身对低温氧化并不敏感，但当它取代进入烷烃链后，将增加链对低温氧化的响应。
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