Tetrahydrofuran

MW 72.12; CAS [109-99-9]; used as a solvent; colorless liquid; ether-like odor; boils at 66°C; vapor pressure 145 torr at 20°C; freezes at −188.5°C; density 0.89 g/mL at 20°C; miscible with water and most organic solvents; highly ammable.