1: 92 percent / KOH / ethane-1,2-diol; H2O / Heating 2: 95 percent / polyphosphoric acid / 1.) 95-100 deg C; 2.) 105-115 deg C, 2 h; 3.) rt, 8 h View Scheme

1: 92 percent / KOH / ethane-1,2-diol; H2O / Heating 2: 95 percent / polyphosphoric acid / 1.) 95-100 deg C; 2.) 105-115 deg C, 2 h; 3.) rt, 8 h 3: 1.) NaH / 1.) benzene, 62-64 deg C, 2 h; 2.) benzene, 70 deg C, 3 h 4: 1.) NaBH4 / 1.) methanol, 0 deg C, 30-45 min; 2.) methanol, r.t., 3-4 h 5: 79 percent / p-toluenesulfonic acid monohydrate, hydroquinone / benzene / Heating View Scheme