1: KCN, 18-crown-6 / CH2Cl2 / 0.17 h 2: acetic acid / 5 h / 23 °C View Scheme

potassium cyanide; 18-crown-6 ether; acetic acid 1) CH2Cl2, ice cooled, 10 min 2) r.t., 5 h; Yield given. Multistep reaction;