Dihydrothiophene
Introduction '''Dihydrothiophenes''' are heterocyclic organosulfur compounds. Two isomers are possible for the parent C4H6S:  * 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.Depending on the substituents, some dihydrothiophenes are called 4,5-dihydrothiophenes.
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