1: propionic acid / 140 - 150 °C 2: LiAlH4 / tetrahydrofuran / 0 - 25 °C 3: Dess-Martin periodinane / CH2Cl2 / 20 °C 4: diethyl ether; tetrahydrofuran / -78 °C View Scheme

1: Dess-Martin periodinane / CH2Cl2 / 20 °C 2: diethyl ether; tetrahydrofuran / -78 °C View Scheme

in tetrahydrofuran; diethyl ether T=-78°C;