Carbon-sulfur bond formation alkanes

Ruthenium-catalyzed asymmetric addition of alkane- or arenesulfonyl chlorides to styrenes leads to optically active suifones22,23. When this conversion is conducted under mild conditions no C —C bond is formed, however, at higher temperatures (100 =C), enantioselective asymmetric carbohalogenation of styrene with trichloromethanesulfonyl chloride (accompanied by sulfur dioxide extrusion) can be achieved with tetrachlorotris[( + )- or (—)-Diop]diruthenium. Excellent yields (up to 100%), but only low asymmetric inductions (up to 13 %), arc observed12. Similar results are obtained with carbon tetrachloride. A mechanism with radical formation w ithin the metal coordination sphere ( radicaloid ) has been proposed. 

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