Tetrahydrofuran is a cyclic organic compound known for its solvency and cyclic ether structure. It is also known as THF, Oxolane, Furan, Butylene oxide, Cyclotetramethylene oxide, Diethylene oxide, and Tetra-methylene oxide. THF is typically a colorless organic liquid that is both water-miscible and low viscosity. Because of its polar nature and broad liquid range, THF serves as one of the most useful organic solvents on the market today.