Condensation with Aldehyde or Ketone Enolate ion attacks a C=O and the alkoxide is protonated.The net result is addition. ROH Chapter 22 3=>Chapter 22 3 Condensation with Aldehyde or Ketone Enolate ion attacks a C=O and the alkoxide is protonated. The net result is addition. C O C _ C O C O C C O _ ROH C O C C OH =>