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

而不是老的教科书提到的位阻。

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.

胺空位阻,核性强,副反容易发生,产物除草活性低。