acetic acid T=120°C; 50 h;

1: 89 percent / 55percent hydriodic acid / 0.25 h / Ambient temperature 2: 1.) copper(I) cyanide / 1.) THF, pentane, from -78 deg C to 0 deg C, 2.) RT, 2 d View Scheme

copper (I) cyanide 1.) THF, pentane, from -78 deg C to 0 deg C, 2.) RT, 2 d; Yield given. Multistep reaction;