1.1: acetic acid / 1 h / 100 °C 1.2: 2 h / Reflux 2.1: hydrogen / Raney Ni / methanol / 6 h / 50 °C / 2206.72 Torr 3.1: acetic acid / ethanol / 4 h / Reflux 4.1: diethyl ether; tetrahydrofuran / 2.5 h / 25 °C 4.2: 3 h / Reflux 5.1: hydrogen / palladium 10 on activated carbon / methanol / 5 h / 70 °C / 3677.86 Torr View Scheme