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α,β-Unsaturated carbonyl compounds, for the most stable intermediate with respect to $\ce{H-}$ ion prefer 1,4-addition. However, $\ce{LiAlH4}$ prefers 1,2-addition over 1,4-addition. This can be explained due to the following reasons. It is more reactive so it prefers a kinetically favorable pathway (1,2-addition is often kinetically favored while 1,4-...


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