1: BF3OEt2 / benzene / Heating 2: 95 percent / benzene / Heating 3: 98 percent 4: 41 percent / 2,3-dicyano-5,6-dichloroquinone / dioxane / 12 h / Heating 5: 96 percent / H2 / Pd/C / methanol 6: 15 percent / dicyclohexylcarbodiimide, meta-chloroperoxybenzoic acid 7: toluene / Heating; Otera's catalyst 8: 96 percent / H2 / Pd/C / methanol View Scheme