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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Mar 2008 18:28:19 IST
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Neither NaBH4 nor LiAlH4 reduces isolated double bonds. However in case of alpha-beta-unsaturated aldehydes or ketones, LiAlH4 reduces only the C=O group but NaBH4 reduces both the C=O & C=C giving a mixture of products in which the C=O reduction product predominates over the double reduction product of both the C=O & C=C groups.
When a phenyl group is attached to the beta carbon of an unsaturated carbonyl compound, both the double bond and the carbonyl group are reduced by LiAlH4.
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