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The wa- ter present in the reaction mixture usually does not have unfa- vourable effects on the desired reduction, provided that there is sufficient borohydride present. This is the main reason why a slight excess of sodium borohydride is used customarily in reduction reactions.
NaBH4 is not able to reduce isolated C=C bond. But, NaBH4 reduces the double bond present in an enal (a conjugated aldehyde). After the reaction C=C bond is gone and left aldehyde is reduced to alcohol in next step by NaBH4.
Sodium borohydride is used in the excess compounds to reduce the aldehyde group-containing other functional groups like phenol carboxylic acid. It is so because sodium borohydride is a mild reducing agent. It can't reduce each carbonyl as it can reduce only aldehyde and ketone to primary and secondary alcohol.
Sodium borohydride reduces disulfides to thiols, which can then be used to reduce nitro groups. Based on the redox properties of 1,2-dithiolane, lipoamide (17) was used for the selective reduction of monosubstituted nitrobenzenes to the corresponding anilines.
Sodium borohydride will reduce aldehydes to primary alcohols and ketones to secondary alcohols.