I 1667 (OTTO) Isopropanol, puriss GR 99%++ Cas 67-63-0 - used widely as a solvent and as a cleaning fluid, especially for dissolving oils. I 1667 (OTTO) Isopropanol, puriss GR 99%++ Cas 67-63-0 - used as both solvent and hydride source in the Meerwein-Ponndorf-Verley reduction and other transfer hydrogenation reactions.