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 Thiophene (Thiophene), the system 1 - thia - 2,4 - cyclopentadiene, CAS 110-02-1. Thiophene is a heterocyclic compound, from the point of view of the structure, is also a sulfide. Formula C4H4S, molecular weight 84.14. Melting point of -38 ° C 84 ° C, boiling point, density 1.051g/cm3. At room temperature, thiophene is a colorless, malodorous, can tear the liquid. Thiophene naturally present in the oil content up to a few percentage points. Industry for ethyl alcohol denaturation. And furan, thiophene is aromatic. Sulfur atoms of two pairs of the lone electron pair of two double bond conjugated to form a delocalized Π. Aromaticity of thiophene is only slightly weaker than benzene.