What is alpha effect? Ex- hydrazine is less basic than NH3 but more nucleophilic due to alpha effect???

Daer Ysh,The alpha effect refers to the increased nucleophilicity of a molecule due to the presence of an adjacent (alpha) atom with lone pair electrons. The molecule does not necessarily exhibit increased basicity compared with a similar molecule without the adjacent, electron donating atom. The effect is well established with many theories to explain the effect but without a clear winner.

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