Reactions of al dehyde& Ketones; Con jugate Additions Conjugated ketones and aldehydes can undergo a reaction which is analogous to the 1, 4-addition reaction of dienes, in which a nucleophile adds to the terminal carbon of the double bond. As in dienes, resonance throughout the conjugated system places cationic character on both carbons #l and 3. Nu Nuc Addition of Amines: Amines add to conjugated ketones and aldehydes to give the conjugate addition product, almost exclusively. CH-NH Addition of HCN: HCN, or preferably(CH,CH,)2AICN, will also add to conjugated ketones and aldehydes to exclusively give the conjugate addition product.Reactions of Aldehydes & Ketones; Conjugate Additions Conjugated ketones and aldehydes can undergo a reaction which is analogous to the 1,4-addition reaction of dienes, in which a nucleophile adds to the terminal carbon of the double bond. As in dienes, resonance throughout the conjugated system places cationic character on both carbons #1 and 3. Addition of Amines: Amines add to conjugated ketones and aldehydes to give the conjugate addition product, almost exclusively. Addition of HCN: HCN, or preferably (CH3CH2)2AlCN, will also add to conjugated ketones and aldehydes to exclusively give the conjugate addition product