Dihydrothiophene

Dihydrothiophenes are heterocyclic organosulfur compounds. Two isomers are possible for the parent C₄H₆S:[1]

2,3-Dihydrothiophene, a vinyl thioether. CAS RN = 1120-59-8.
2,5-Dihydrothiophene, an allylic thioether. A well-known derivative is 2,5-dihydrothiophene 1,1-dioxide. CAS RN = 1708-32-3.

Chemical structures of 2,3-dihydrothiophene (left) and 2,5-dihydrothiophene (right)

Depending on the substituents, some dihydrothiophenes are called 4,5-dihydrothiophenes.

References

Shvekhgeimer, M. G. A. (1998). "Dihydrothiophenes. Synthesis and Properties (review)". Chemistry of Heterocyclic Compounds. 34: 1101–1122. doi:10.1007/BF02319487.

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