# Reduction of conjugated double bond by sodium borohydride

Some of my teachers were debating about whether a double bond in conjugation with a ketone is reduced or not by $$\ce{NaBH4}.$$ One of my teachers presented the evidence from Clayden which had an example where a cyclic ketone was reduced alongside the conjugated double bond.

However, there was no example for a straight chain compound. Also, the book said that steric hindrance may affect the reduction process and only favour the reduction of ketone.

I want to know that is there any authentic source which has an example of reduction of a conjugated double bond and ketone via $$\ce{NaBH4}.$$