Hyperconjugation not steric repulsion leads to the staggered s ...

而不是老的教科书提到的应。

As steric hindrance of the aryl amine decreased and nucleophilicity increased, occurrence of the transfor-mation reaction increased and herbicidal activity of the product decreased.

芳胺空越小,越强,副反应越容易发生,产物除草活越低。