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 Thiophene (Thiophene), the system name 1 - thia 2,4 - cyclopentadiene, CAS No. 110-02-1. From the structure point of view, Thiophene is a heterocyclic compound is a sulfide. Formula C4H4S, molecular weight 84.14. Melting point -38 ℃, the boiling point of 84 ℃, density 1.051g/cm3. At room temperature, thiophene is a colorless, odor, can tear fluid. Thiophene naturally in petroleum, the content can be up to several percentage points. Industry for ethyl alcohol denatured. And furans, thiophene is aromatic in nature. Sulfur atoms in the two pairs of lone electron pair of conjugated double bonds with the two form a bond from the domain Π. Aromatic thiophene only slightly weaker than benzene.