现在存在着大量的事实表明,不对称试剂对于不对称烯烃进行离子型加成反应时,可以得到两种位置异构产物,它们的相对数量随加成试剂的不同和烯烃结构的改变而变化。以烯键碳上氢原子数目多少为指标的经典的马可尼柯夫规律,和以电子理论为基础的加成定向规律,都只能定性地指出加成的主要方向,既不能定量地表达两种异构产物间的数量关系,也不能指示产物比例随烯烃结构改变而产生的变化。 There are a large number of facts that show that asymmetric reagent for asymmetric olefin ion-type addition reaction can be obtained two kinds of positional isomerization products, their relative amount with the addition of reagents and alkene structure changes. The classical Marconic law based on the number of hydrogen atoms on the ethylenic carbon and the law of addition orientation based on electronic theory can only qualitatively indicate the main direction of addition and can not be quantitatively expressed The quantitative relationship between the two isomeric products also does not indicate any change in the product ratio as the alkene structure changes.