Coupling copper sulfinates

Alkynyl sulfones. A straightforward preparation of these sulfones consists of the nochemical induction of coupling of 1 -iodoalkynes with copper sulfinates (tosylates, etc.) - THF. 

The coupling of acetylenic iodides with copper sulfinates leads to the formation of uncommon acetylenic sulfones (Fig. 26). Sonication promotes this reaction, which can be made even easier by using a mixture of the sulfinic acid and commercial copper "carbonate" (a hydrated mixture of copper carbonate and hydroxide).i54 Successful results were also recorded in an extension using copper thiosulfonates and copper dimethyl phosphite. 

Table 9.17 Copper/ligand catalyzed coupling between aryl halides and sulfinic acid salts.

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