Abstract
1. In the investigated series of acetylenic sulfides, sulfoxides and sulfones the maximum indications of conjugation are manifested between the sulfide sulfur and the C≡C bond. 2. The sulfonic group practically does not enter into conjugation with the triple bond, but it does polarize it, thus increasing the acidity of the acetylenic C-H bond. 3. In its effect on the triple bond the sulfoxide group occupies an intermediate position between the S and SO2 groups.
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