Asymmetric radical reaction in the coordination sphere. 2. Asymmetric addition of alkane- and arenesulfonyl chlorides to olefins catalyzed by a ruthenium(II)-phosphine complex with chiral ligands
The first demonstration of the hydrogenation of sulfoxidesunder atmospheric H2 pressure is reported. The highly efficient reaction is facilitated by a heterogeneous Ru nanoparticle catalyst. The mild reaction conditions enable the selective hydrogenation of a wide range of functionalized sulfoxides to the corresponding sulfides. The high redox ability of RuOx nanoparticles plays a key role in the
Thioethers bearing an optically active secondary alcohol were desulfurized with Raneynickel — sodium hypophosphite — acetate buffer system to give optically active alcohols without racemization in high yields. This Raneynickel combination system exhibited a unique desulfurization of benzylthio or phenylthio group in the presence of benzyl ether.
Sulfides and sulfoxides bearing an optically active secondary alcohol were desulfurized with a Raneynickel (W-2)-sodium hypophosphite combination system to give optically active alcohols in high yields without racemization. However, the combination system was not effective with sulfides which comprise an alkylthio group and the corresponding sulfoxides. This system exhibited the reductive desulfurization