2-bromo-diaryl sulfoxides

Scheme 4.4 Palladium-catalyzed arylation of 2-bromo-diaryl sulfoxides.

Deoxygenation of sulfoxides. Alkyl sulfoxides are reduced to sulfides on treatment with either bromo- or iodotrimethylsilane in CCI4 at room temperature for 30 minutes (yields generally around 80%). Some halogenated products are also formed in the case of diaryl or dibenzyl sulfoxides. 

Iron pentacarbonyl is an excellent reagent for deoxygenating dialkyl, diaryl, or heterocyclic sulfoxides to sulfides (Alper and Keung, 1970). The mechanism for this reaction is similar to that described for the N-oxide-Fe(CO)5 reaction. Moderate yields of thiobenzophenones were realized by reaction of diaryl sulfines with Fc2(CO)9 in benzene or Mn2(CO)io in heptane (Alper, 1975b). a-Bromo sulfoxides (XL) react with Mo(CO)g in 1,2-dimethoxyethane to... 

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