1: 62 mg / Cr(OAc)2 / CHCl3; acetic acid / 1 h / Ambient temperature 2: 26 mg / Li2CO3, LiBr / dimethylformamide / 4 h / 80 °C 3: 30 percent H2O2, 2 N NaOH / dioxane / 24 h / Ambient temperature 4: diethyl ether 5: 58 mg / Cr(OAc)2 / ethanol / 1 h / Ambient temperature 6: 15 mg / NaBH4 / propan-2-ol / 0.5 h 7: 178 mg / 2 N LiOH / methanol / 1 h / Heating View Scheme