1: 87 percent / tetra-n-butylammonium chloride, palladium acetate 2: 86 percent / ammonium acetate 3: 80 percent / sodium borohydride / methanol 4: 50 percent / Zn, HCl / methanol / Heating 5: 85 percent 6: 70 percent / lithium aluminum hydride / tetrahydrofuran View Scheme