1: 1.) NaOEt / 1.) EtOH, reflux, 15 min, 2.) EtOH, reflux, 24 h 2: KOH / ethanol / 2 h / Heating 3: 1 h / Heating View Scheme

1: KOH / ethanol / 2 h / Heating 2: 1 h / Heating View Scheme

1: H2SO4 / benzene / 36 h / Heating 2: LAH / diethyl ether; tetrahydrofuran / 48 h / Heating 3: 48percent HBr, H2SO4 / 24 h / Heating 4: 1.) NaOEt / 1.) EtOH, reflux, 15 min, 2.) EtOH, reflux, 24 h 5: KOH / ethanol / 2 h / Heating 6: 1 h / Heating View Scheme

1: 48percent HBr, H2SO4 / 24 h / Heating 2: 1.) NaOEt / 1.) EtOH, reflux, 15 min, 2.) EtOH, reflux, 24 h 3: KOH / ethanol / 2 h / Heating 4: 1 h / Heating View Scheme

1: LAH / diethyl ether; tetrahydrofuran / 48 h / Heating 2: 48percent HBr, H2SO4 / 24 h / Heating 3: 1.) NaOEt / 1.) EtOH, reflux, 15 min, 2.) EtOH, reflux, 24 h 4: KOH / ethanol / 2 h / Heating 5: 1 h / Heating View Scheme

(heating);