是取化基，如乙氧基、甲氧基及它们的环氧和烷氧同系物或卤基。
R "is a replaceable function, e. G. Acetoxy, methoxy, their acyloxy and alkoxy homologs or halo."
这些变异对于细胞向卤代基的转化的影响将是后续研究的课题。
The contribution of these mutations to the adaptation of the cells towards the halogenated base will be the subject of follow-up studies.
卤原子作为炔烃三键活化基团和定位基，炔烃三键发生亲电加成反应；
This type of reaction has signicant advantages, the alkyne proceeds the coupling reaction with the halogen atom as the leaving group.
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