Iron‐Promoted, Regio‐ and Stereoselective Allylic Substitutions for the Synthesis of Alkenyl Sulfones Substituted at C‐3

Almost complete transfer of chirality is observed in the nucleophilic addition of various carbon and nitrogen nucleophiles (Nu) to the highly enantiomerically enriched 1-phenylsulfonyl-substituted (η3-allyl)tetracarbonyliron(1+) tetrafluoroborate with planar chirality (1; de, ee > 98%). Oxidative decomplexation yields alkenyl phenyl sulfones 2 with a range of subtituents at C-3 and high enantiomeric purity (ee ≥ 96%).