1: 92 percent / tri-n-butyltin hydride; 2,2'-azobisisobutyronitrile / toluene / 0.83 h / 95 °C 2: 100 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 0 °C 3: 100 percent / aq. ammonia / methanol View Scheme