Tetrahydrofuran is a heterocyclic organic compound with the molecular formula C4H8O. Tetrahydrofuran belongs to ethers and is the complete hydrogenation product of furan. It is a colorless, water-miscible organic liquid with small viscosity at normal temperature and pressure. Because of its long liquid range, it is a commonly used medium polar aprotic solvent. Its main use is as a precursor of high molecular polymers.
Pyrazolidine is a saturated organic heteromonocyclic parent. Pyrazolidines are important synthetic intermediates in organic synthesis. Pyrazolidine compounds are valuable heterocyclic compounds due to their powerful biological properties.
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