... 基因置换;gene substitution 环取代;ring substitution 直接代入法;direct substitution ...
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苯环取代反应 Aromatic Subsititutions
环取代的 cyclosubstituted
环化取代重排 cyelization displacement rearrangement
苯环取代基 substitutes on benzene
环取代聚苯胺 ring substituted polyaniline
吩噻嗪侧环取代衍生物 Phenothiazine derivatives substituted on lateral rings
环上取代 ring substitution
环上取代反应 Nucleus Substitution
环上取代作用 ring substitution
实验结果表明：焦炭前身物主要由三环取代芳香化合物组成，并有芳醚类化合物存在。
It was found that the coke precursor was mainly three ring aromatic compounds with a few of aromatic ethers.
值得注意的是， 这种糖片段上有芳环取代的烷酰氧基基团的麦角甾烷型甾体糖苷为真菌中首次报道。
It is worth while to note that the steroidal glycoside possessing an aromatic ring substituted alkanoyl group at its glucose moiety was found for the first time in fungi .
采用本发明的拆分方法制备单一手性2-杂环取代的 二氢嘧啶化合物的产物收率为20％以上，光学纯度达98％以上；
The splitting method adopted for preparing single chiral 2-heterocycle substituted dihydro pyrimidine compounds has the product yield more than 20 percent and the optical purity above 98 percent;
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