steric

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

而不是老的教科提到的位阻。

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.

芳胺空间位阻小,亲强,副反容易发生,产物除草活低。