Abstract
Addition Reactions of 2-Thiazolin-5-thiones with Acetylenes.
The reaction of the 2-thiazolin-5-thiones 1 and 5, respectively, with acetylene carboxylates yields mainly 1,4-dithiafulvenes of type 3. In the presence of the acetylenic compounds, the 1,4-dithiafulvenes undergo an isomerization to give the corresponding 2,3-dihydrothiophene-2-thiones 4.