“neighboring group assistance”的概念、定义、翻译、参考文献-科学参考

单词	neighboring group assistance
释义	neighboring group assistance Encyclopedia 理学邻助作用释 neighboring group assistance; anchimeric assistance邻助作用进行亲核取代反应的底物分子，若同时存在亲核的基团和离去基团，且这两种基团在空间位置上的距离也适当，则在亲核取代反应的条件下，将优先发生分子内的亲核取代反应，生成环状产物，从而影响反应的立体选择性、区域选择性或活性的现象。又称邻基参与。
随便看	paddy-upland rotation paddy water saving irrigation Pade Pade approximant Pade approximants PA degree PA-degree Padeitharaza PADF pad fluid p-adic absolute value p-adic algebra p-adically closed field p-adically equivalent p-adic analysis p-adic cohomology p-adic completion p-adic convergence p-adic differential equation p-adic exponential valuation p-adic extension p-adic field p-adic formal group p-adic fraction p-adic ground field

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