Asymmetric hydroformylations of sulfur-containing olefins catalyzed by BINAPHOS—Rh(I) complexes

Asymmetric hydroformylations of vinyl sulfides, allyl sulfides, and allyl sulfones catalyzed by (R,S)-BINAPHOS/Rh(acac)(CO)2 afforded the corresponding branched oxo aldehydes as major products in 60–89% ee. Use of bulkier substituents on the sulfur in vinyl sulfides gave the branched oxo-aldehydes in higher regio- and enantioselectivities.